White Paper - SixStringers Precision Nut Slot File System

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System Designation: SixStringers Precision Nut Slot File System
Document ID: WP-GNSF-2026-REV8
Classification: Mechanical Engineering / Tribology / Production Instrumentation

• Substrate: The base metal layer (in this context, the raw carbon or spring steel core blank of the file with a nominal thickness of 0.15 mm for fine-gauge applications).
• Co-Deposition: The electrochemical or autocatalytic chemical reduction process of embedding non-conductive solid particulate matter (synthetic diamond grit) within a metallic binding matrix (nickel).
• Internal Tensile Stress ($\sigma_t$): An internal molecular contracting force operating within a plated metal layer during cooling or lattice crystallization that causes it to shrink inward.
• Joule Heating (I²R): Localized thermal energy generated by electrical resistance at the cathode boundary layer during electroplating baths maintained at 40°C to 60°C.
• Anodic Dissolution: The non-mechanical atomic removal of substrate mass via an electrochemical electrolyte circuit.
• Acoustic Takeoff Point: The leading edge of the nut profile where the string terminates its active vibrational length and transitions to the tuning post.
• Transverse Displacement: Side-to-side lateral physical deflection of a string element within a carved channel.
• Keel: An extended structural profile that projects downward from a rigid base or spine without lateral clamping reinforcement.
• Kerf: The width of a cut or channel made by a blade or profiling instrument.
• Kinematic Boundary: The strict dimensional or directional limits governing a tool's physical capacity to remove material along designated coordinate axes (X, Y, Z).

This document details the critical engineering boundaries, tribological behaviors, and mechanical failure modes governing guitar nut slotting instrumentation. It contrasts the rigid kinematic limitations of traditional single-point toothed saws against the multi-point abrasive mechanics of modern coated diamond tools.

While diamond-coated instrumentation offers an omnidirectional material removal advantage, physical multi-point micrometer evaluations reveal a severe structural paradox in fine-gauge blades (≤ .010”). The chemical co-deposition process required to bind synthetic diamond grit onto an ultra-thin 0.15 mm steel core—whether executed via traditional electroplating or modern electroless reduction—induces severe internal tensile stresses and thermal contraction mismatches, resulting in an inescapable longitudinal and lateral factory warp. This paper outlines the mechanical failure modes of prominent commercial designs and demonstrates how un-stabilized, warped tools over-size channels, violate critical acoustic clearance boundaries, and cause string rattle.

Finally, this paper presents the SixStringers Precision Nut Slot File System, an integrated engineering tool architecture that permanently eliminates these systemic errors. By pairing an advanced edge-profiling process with a high-tension, face-to-face mechanical sandwich handle housing swappable dual-edge blades, a capo-mounted perpendicular guide template, and onboard, selectable precision depth-of-cut controls, the SixStringers Precision Nut Slot File System achieves a perfect, progressive slot trajectory synchronized to a true-leveled fret plane with zero mechanical deflection and zero manual guesswork.

For decades, the primary industrial method for shaping and sizing guitar nut slots relied on linearly arranged, single-point toothed metal files. These instruments operated via traditional orthogonal shearing, using downward manual force to slice material chips out of the nut blank substrate (e.g., natural bone, synthetic polymers, composite materials).

While long accepted as the industry standard, these tools possess severe kinematic liabilities:

• Unidirectional Material Removal: Saws remove substrate mass strictly on the forward plunge stroke, increasing bench-time overhead.
• Gullet Mechanical Loading: Microscopic debris packs into the spaces between the teeth (gullets), requiring constant cleaning and maintenance to prevent tool binding.
• Kerf Drift and Skating: Lacking lateral stabilization, the rigid teeth frequently skate across the polished nut face at stroke initiation, permanently scarring the workpiece and degrading entry tolerances.

The fatal operational limitation of traditional toothed files lies in their absolute lateral rigidity. Because the single-point cutting teeth are positioned exclusively along the bottom root radius and the vertical sidewalls are ground smooth ("safe edges"), the tool is physically incapable of lateral material removal.

The dimensional output of the slot is completely locked to the fixed thickness of the steel blade. If a technician encounters a minor string-gauge mismatch—such as trying to accommodate a .014” string utilizing a .013” toothed file—the file cannot widen the channel. Forcing the blade laterally leads to binding, tool jamming, or slot deformation. To widen the channel, the operator is mathematically forced to halt production and swap to an entirely separate, thicker tool.

To circumvent the tracking and single-dimension constraints of saw-like tooling, the industry introduced diamond-coated files. This configuration replaces linearly cut steel teeth with a multi-directional matrix of industrial synthetic diamond grit bound to a steel core substrate [MusicNomad, StewMac].

By shifting the removal mechanism from orthogonal slicing to micro-abrasive grinding, these tools cut continuously on both the forward and backward strokes. This multi-point abrasive layout distributes cutting vectors randomly across a spherical matrix, drastically lowering tool deflection and eliminating initial tool skating.

Furthermore, because the abrasive matrix encapsulates both the bottom radius and the vertical sidewalls of the blade substrate, the tool gains an omnidirectional material removal capability [MusicNomad, StewMac]. By gently rocking or leaning the tool side-to-side during the stroke, the operator can engage the vertical sidewalls, allowing a single tool profile to systematically widen a channel to clear a slightly larger string gauge without binding [StewMac]. This mechanical boundary condition removes the strict requirement for single-dimension file tracking, allowing minor lateral clearancing to be executed inline without changing tools.

To establish the performance criteria of a slotting tool, the geometric relationship between the resting string and the cut channel must be strictly quantified. The physics of string acoustics dictate that the nut slot must operate within narrow dimensional boundaries.

       [ MINIMUM BOUNDARY ]                   [ MAXIMUM BOUNDARY ]
   Zero-Clearance Mechanical Pinch          Oversized Transverse Slop
      
         +---------------+                      +---------------+

         |   /-------\   |                      |  /-------\    |
         |  | String  |  |                      | | String  |   |
         |   \-------/   |                      |  \-------/    |
         +---------------+                      +---------------+
         <- Exact Match ->                      <--- > +0.003" ---->
         Choked Vibrations                      "Sitar Effect" Fret Buzz

A nut slot cannot exactly match the physical diameter of the string substrate (+0.000” clearance). When a slot is cut to a zero-clearance tolerance, the system experiences a severe spike in friction coefficients, inducing two catastrophic failure states:

• Stick-Slip Adhesion: The string is unable to glide seamlessly through the channel during tuning or string bending, getting trapped until tension breaks free violently, resulting in sudden tuning stability failure and an audible high-pitched acoustic distortion.
• Acoustic Note Distortion: The rigid lateral pinching restricts the natural open vibrational envelope of the string, shortening the fundamental frequency's decay cycle and introducing harmonic distortion that mutes the note's natural sustain.

To ensure friction-free travel, empirical data dictates that a slot must feature a minute clearance buffer. However, this clearance operates within a strict upper boundary: the slot width must not exceed the nominal string gauge by more than .003” (0.076 mm). Crossing this maximum threshold introduces secondary acoustic failure:

• Transverse Displacements: If a slot is cut wider than +0.003”, the string shifts and wobbles laterally inside the channel under the kinetic force of picking or strumming.
• The Sitar Effect: Because the string lacks a solid, singular takeoff anchor point at the leading edge of the nut, it continuously bounces against the oversized sidewalls. This introduces chaotic parasitic vibrations, manifesting to the listener as severe string rattle and fret-like buzzing.

Traditional, generic luthiery targets uniform or static first-fret depth clearances across the nut blank (e.g., standard blocks of .016" for trebles stepping rigidly up to .020" for basses). This approach introduces a severe geometric contradiction on acoustic instruments. An acoustic guitar saddle does not follow a symmetrical line; rather, it introduces a steep, calculated cross-axis tilt to the string plane across the bridge. To allow the high-amplitude, low-frequency oscillations of the wound Low-E string to clear the frets, the saddle profile sits significantly higher on the bass side (~0.10" clearance) than on the treble side (~0.0075" clearance).

If a technician maps this aggressive cross-axis slope back to a generic, stepped nut slot progression, the individual string trajectories twist along conflicting vectors across the neck, causing the middle strings (D and G) to sit at erratic, uncomfortable heights or choke out entirely. To achieve a mathematically balanced, uniform gradient that harmonizes with the saddle slope, the nut slots must follow a precise, sequential .001" step progression across the fingerboard: .014", .015", .016", .017", .018", and .019" up to .024".

When manufacturing a diamond-coated file for light-gauge strings—specifically targeting the standard .010” high-E baseline—the core engineering challenge shifts to the physical limits of metallurgical substrates. For a file to cut a .010" slot, the steel substrate core must be machined down to an ultra-thin thickness, typically measuring no more than .0059” to .0060” (0.15 mm). This severe constraint is necessary because the chemical matrix and drapes of synthetic diamond grit will aggregate on both sides of the blade, adding to the total thickness to reach the final .010" tool specification.

The core engineering justification used by commercial sellers for a radiused edge—precision seating—is completely contradicted by manufacturing mechanics. In heavier file gauges (e.g., .024" and above), the factory can mechanically chamfer, tumble, or radius the sharp 90-degree corner edges of the steel substrate.

However, at a substrate thickness of 0.15 mm, the steel sheet behaves like a razor blade. It is physically and mechanically impossible to perform precision, uniform rounding on a 90-degree corner edge that thin using traditional mechanical milling, tumbling, or grinding without structurally collapsing, warping, or splitting the entire core blank under the stress of the machining tool. Consequently, these ultra-fine file blanks must be left with completely raw, sharp, square-cut corner edges before entering the plating bath. The radius edge found on commercial fine tools is merely an accidental artifact of chemical accumulation, not an intentional design feature for string seating.

When the synthetic diamond grit drapes over a sharp, un-rounded 90-degree corner during the plating step, it creates an extreme concentration of localized strain, resulting in an uneven, high-stress profile.

During operational use, the luthier subjects the file to aggressive longitudinal abrasion. Because the underlying steel core has a sharp corner rather than a supportive radius, the forces of the filing stroke are concentrated entirely on a microscopic ridge line. This induces a textbook tribological failure:

• The sharp edge acts as a mechanical wedge, focusing shear stress directly on the thin metal binding matrix.
• Lacking a rounded shoulder to distribute the lateral load, the structural bond fractures under manual stroke pressure.
• The diamond grit quickly strips away from the raw corner edges after minimal use, leaving a completely bare, smooth steel wire that can no longer abrade the nut material [Facebook - guitarrepairsdiscussion].

The electrochemical co-deposition process introduces severe internal stress. The nickel electrolyte bath must be maintained at a heated ambient temperature of 40°C to 60°C, and passing a high current density generates localized Joule heating (I²R resistance loss) directly at the cathode boundary layer. Because non-conductive diamond particles disrupt the uniform crystallization of the nickel, the outer coating develops massive internal tensile stress, acting like a contracting band.

Because a 0.15 mm steel core possesses virtually no structural mass or cross-sectional rigidity, it is entirely incapable of resisting this contraction, forcing the raw blade to cool into a deformed profile marked by a longitudinal lateral bow, corkscrew twists, or wave-like ripples.

Naysayers and external analysts frequently argue that the structural warp of thin-gauge diamond files can be bypassed by shifting from conventional electrochemical plating to an autocatalytic chemical reduction method, commonly known as electroless plating. While electroless nickel (EN) composite baths distribute material evenly across vertical sidewalls and eliminate the electrical current density spikes found at 90-degree corners, rigorous materials-science analysis proves that electroless plating introduces identical, and often superior, internal distortion failure modes on ultra-thin substrates:

1. Elevated Thermal Strain Activation (80°C to 90°C): Unlike electroplating baths which function at a relatively mild 40°C to 60°C, electroless nickel co-deposition requires a high activation energy, demanding bath operating temperatures strictly maintained between 80°C and 90°C (176°F to 194°F). Submerging a 0.15 mm steel core into this near-boiling electrolyte induces aggressive thermal expansion. When the file cools to room temperature post-processing, the sudden temperature drop triggers a severe thermal contraction mismatch between the dense composite nickel skin and the fragile steel core, warping the tool.
2. Volatile Tensile Stress Shifts (Bath Aging): The internal stress profile of an electroless nickel coating changes dynamically depending on the phosphorus concentration and the age of the bath (measured in Metal Turn-Overs, or MTOs). While a fresh, high-phosphorus EN bath may initially start with mild compressive stress, orthophosphite byproduct accumulation inevitably drives the chemistry into a state of high internal tensile stress. Once tensile stress takes over, the outer electroless skin acts like an aggressively tightening tourniquet, immediately buckling the defenseless 0.15 mm steel core into a longitudinal lateral curve or corkscrew warp.
3. Crystalline Lattice Disruption via Particle Occlusion: Dropping non-conductive, rigid synthetic diamond particles into an electroless bath completely disrupts the clean, uniform development of the nickel-phosphorus alloy grains. The nickel matrix is forced to grow irregularly around the diamond blocks, locking massive localized stress anomalies into the crystalline lattice that degrade structural straightness.

Consequently, fluid chemistry holds no solution for thin-substrate deformation. Whether a manufacturer utilizes electroplating or electroless plating, the thermodynamic contraction and internal tensile stresses will inevitably pull a bare 0.15 mm steel blade completely out of flat.

Certain commercial designs, notably exemplified by MusicNomad, attempt to resolve tool handling by attaching the file substrate to a wide, rigid top block, leaving the thin cutting blade extending downward like a ship's keel [MusicNomad]. Mechanical analysis reveals that this geometry exacerbates the lateral warp of the cutting edge rather than mitigating it:

• Asymmetric Boundary Constraints: The massive top block maintains absolute structural rigidity in the bath, while the 0.15 mm hanging keel experiences aggressive tensile contraction. Because the top edge of the blade is locked to an unyielding spine while the bottom cutting edge is free to move, the internal stress forces the exposed bottom edge to warp and ripple drastically against the rigid base.
• Absence of Coaxial Compression: Because the face of the active cutting edge is left entirely exposed to allow for slot depth clearance, there is no lateral clamping force to flatten the blade. When operating, this factory-born waviness causes the blade to wobble side-to-side through the stroke, widening the slot past the critical +0.003” clearance boundary and directly corrupting the nut slot.

To establish baseline data regarding factory-born distortion in the integrated keel design framework, physical micrometer measurements were conducted along the active cutting profile of a commercial MusicNomad .010” (0.254 mm) designated single-edge nut file [MusicNomad]. The tool was evaluated across its entire longitudinal axis to determine the exact delta between the stated manufacturing gauge and the actual physical sweep of the warped blade.

This dimensional data confirms the exact mechanical behavior of the uncompensated asymmetric boundary condition. At both ends of the tool, the cutting edge measures .013”, representing a +.003” dimensional variance over the nominal specification due to expected corner plating accumulation.

However, the surge to .017” at the mid-span provides mathematical proof of severe lateral warping. The additional .004” of thickness measured across the center length is not an increase in plating matrix thickness; rather, it is the total lateral sweep or amplitude of the physical wave induced by the internal tensile stress of the cooling coating layer. Because the thin 0.15 mm steel keel is locked to a rigid, unyielding spine on its top edge while remaining completely open and unsupported on its bottom edge, the internal stresses buckle the center of the blade outward into a permanent, un-rectifiable banana warp.

To verify the systemic nature of this failure mode, a wider field audit was conducted utilizing diagnostic data from multiple independent luthiers and field operators. Upon being instructed to conduct multi-point micrometer evaluations along the active profile of their respective open-keel files, consumers universally reported identical physical behaviors. Across all field samples, a recurring dimensional pattern emerged: terminal boundaries consistently measured .013” (0.330 mm) while mid-span sweeps universally expanded to an effective operational envelope of .015” to .018” (0.381 mm to 0.457 mm) due to lateral buckling.

This field-wide tracking provides empirical verification that the lateral warp is physically inescapable under this design framework. Because the manufacturing blueprint pairs an ultra-thin 0.15 mm steel blank with a rigid, unyielding spine block, the thermodynamic contraction of the nickel-diamond deposit cannot be absorbed or neutralized. The resulting structural deformation is an inevitable consequence of the tool's core geometry.

The structural invalidity of commercial "precision radius" claims on ultra-fine gauges is further substantiated by empirical field lifespans. A comprehensive audit of long-term professional luthier data reveals a stark performance divergence across a single production set: macro-gauge files (≥ .020") possess sufficient substrate mass to absorb tensile stresses, yielding sustained material removal rates over extended operational cycles [Thomann]. Conversely, micro-gauge tools (≤ .013") exhibit a rapid, systemic decay in cutting capacity, with operators documenting that files "become blunt in no time" or cease effective abrasion after processing a single-digit matrix of natural bone substrates [Thomann].

Under microscopic inspection, this failure state is identified as co-deposition matrix stripping caused by the un-rounded 90-degree corner geometry focusing intense localized shear stress along a singular micro-ridge, shearing the diamond particles completely away from the core and leaving behind smooth, bare steel wire. The manufacturer's awareness of this core defect is empirically documented by consumer-tracked technical communications, wherein the brand acknowledged executing post-production modifications to the grit parameters of their thinner files to make them "cut easier" [Thomann]. This alteration serves as an administrative masking mechanism that bypasses the structural root cause—the un-rounded 0.15 mm corner geometry—leaving the fundamental flaw uncorrected.

Conversely, manufacturers such as StewMac approach the marketplace by shipping their premium DiamondCut files as completely bare, flexible strips of steel, while selling the rigid stabilizing handle (Nut File Backer) as an independent, auxiliary accessory [StewMac]. Field performance data and institutional luthier bench audits reveal that this un-stabilized, bare configuration introduces secondary structural failure modes:

• Uncontrolled Lateral Deflection: Because the tool is shipped as a raw, flexible strip with no built-in rigidity, the thin .010” and .013” files bend and flex effortlessly under baseline manual hand pressure. Independent field engineering logs describe the bare tool as "flimsy," noting that it immediately buckles under forward stroke friction.
• The Trajectory of Tracking Failure: This structural buckling causes the blade to snake erratically through the cut. Instead of executing a precise, linear downward plunge, the flexible blade shifts off-axis, carving a widened, irregular slot channel that instantly blows past the .003” maximum clearance threshold, resulting in immediate string rattle.
• The Commercial Warranty Insurance Loophole: A core point of user feedback is a heavy reliance on the manufacturer's lifetime replacement policy for these specific thin-gauge tools [The Gear Page, Trustpilot]. From an engineering perspective, this systemic replacement rate serves as a corporate acknowledgment of an unresolved manufacturing vulnerability. Rather than redesigning the raw 0.15 mm edge to eliminate rapid grit stripping, the cost of inevitable tool failure is baked directly into the premium retail pricing.

The systemic retention of un-rounded 0.15 mm square edges and un-stabilized blades across the commercial tooling market is driven entirely by sub-contract manufacturing economics. To resolve the edge-wear vulnerability without tool-induced mechanical or thermal deformation, an advanced, non-mechanical profiling process is required. However, outsourcing this step to third-party contract machine houses introduces a severe cost barrier:

Applying standard industrial distribution multipliers (a 4× to 5× factor tracking factory cost to final shelf MSRP), a $15.00 production hike enforces a $60.00 to $75.00 increase in final retail pricing. For a tool line engineered to occupy a mainstream mass-market sweet spot, forcing this production cost shift decimates volume margins and transforms retail capitalization. Consequently, commercial sellers are financially locked into an engineering compromise: they maintain their baseline price point by omitting the edge-rounding phase, or they enforce steep retail premiums for un-stabilized wire-blade components [StewMac] while still requiring external stabilizing components to manage baseline tracking straightness.

Because the plating warp cannot be prevented during manufacturing chemistry, the burden of achieving geometric accuracy falls entirely on the structural design of the tool holder. To achieve a reasonably correct, straight, and on-gauge nut slot, a face-to-face, high-tension sandwich handle is a mandatory engineering requirement.

The SixStringers Precision Nut Slot File System achieves this requirement through a highly rigid, user-friendly modular handle configuration. Rather than forcing the technician to manage individual, loose strips or repetitive tool changes, the system mounts up to four physical dual-edge blades simultaneously within a singular high-tension clamping handle assembly.

   [ EXTERNAL CLAMPING JAW ] -> High-Tension Coaxial Compression
   =========================
   [ BLADE 1: DUAL-EDGE ] ----> Compressed Dead-Flat (Straight & True)
   [ BLADE 2: DUAL-EDGE ] ----> Compressed Dead-Flat (Straight & True)
   [ BLADE 3: DUAL-EDGE ] ----> Compressed Dead-Flat (Straight & True)
   [ BLADE 4: DUAL-EDGE ] ----> Compressed Dead-Flat (Straight & True)
   =========================
   [ EXTERNAL CLAMPING JAW ] -> High-Tension Coaxial Compression

When high-tension compressive force is applied directly across the active lateral walls of the mounted blades, the rigid external jaws completely overpower the internal tensile stress of the coating matrix, squashing the ripples flat, straightening the lateral bow, and forcing the 0.15 mm cores into a dead-straight, stable trajectory.

This modular architecture maximizes bench efficiency by consolidating up to eight distinct cutting gauges within a single handheld unit. The blades are fully user-swappable for custom configuration adjustments. Because every individual blade features a double-edge format, transitioning between complementary string gauges requires no tool tear-down; the operator simply flips the handle assembly over to engage the alternative cutting edge.

The fundamental paradigm shift of the SixStringers Precision Nut Slot File System lies in the total rejection of localized, single-point manual measurement loops. The nut slot cannot be decoupled from the fret plane. If the frets are not True Level—perfectly concentric to the fingerboard radius and absolutely identical in height from the wood—it is a mathematical impossibility to cut an accurate nut slot.

The advanced SixStringers system resolves this by establishing an integrated, four-part closed-loop machining matrix:

  +-----------------------------------------------------------------+

  | 1. TRUE LEVEL FRET PLANE                                        |
  |    Establishes a mathematically perfect global reference line.  |
  +-------------------------------+---------------------------------+
                                  |
                                  v
  +-----------------------------------------------------------------+

  | 2. CAPOED GUIDE TEMPLATE                                        |
  |    Clamps over frets; flushes to nut face for 90° right angle.  |
  +-------------------------------+---------------------------------+
                                  |
                                  v
  +-----------------------------------------------------------------+

  | 3. RIGID DUAL-PLATE SANDWICH JAWS                               |
  |    Crushes plating warp flat; tracks along the linear guide rail. |
  +-------------------------------+---------------------------------+
                                  |
                                  v
  +-----------------------------------------------------------------+

  | 4. SELECTABLE PRECISION DEPTH STOPS                             |
  |    References fret crowns; mechanically stops file at thousandth.|
  +-----------------------------------------------------------------+

1. The Reference Plane: The technician ensures that the frets are True Level, establishing a flawless baseline.
2. The Alignment Track: A dedicated SixStringers guide template is attached directly to the fretboard utilizing a capo. Clamping the template over the true-leveled frets turns the global fret plane into an active guide path. The square end of the template flushes dead-flat against the face of the nut, establishing a strict 90-degree perpendicular right-angle baseline that permanently eliminates axis drift and crooked cuts.
3. The Lateral Constraint: The side of the rigid, multi-blade SixStringers handle assembly tracks flush along the edge of the capoed template, functioning as a linear guide rail that restrains the file from snaking or deflecting side-to-side. This ensures the uniform radius edges—achieved via a non-mechanical, non-thermal proprietary process that prevents diamond shearing—hold their exact tracking paths without widening the channel kerf.
4. The Vertical Constraint: As the file executes its stroke on-plane with the global fret layout, onboard selectable precision depth-of-cut control stops track along the reference line. Rather than filing blindly and checking with separate external indicators, the user dials the target sequential depth clearances directly onto the tool holder (.014" to .024" in precise .001" increments). The file cuts down cleanly and halts downward progress mechanically the exact thousandth of an inch the stop engages the true-leveled fret plane.

By enforcing an integrated, mechanical workflow where every component governs the accuracy of the next, the SixStringers Precision Nut Slot File System transforms nut slotting from an anxious, error-prone manual chore into a foolproof engineering operation. It completely eliminates manual measurement cycles, tracking errors, edge degradation, and human bias.

Because this instrument is engineered strictly as an elite, high-precision industrial system for commercial repair shops, boutique builders, and master technicians who invest in absolute certainty, the catalog operates under a strict, non-discounted linear pricing architecture anchored at $150.00 per physical tool blade.

Due to the dual-edge file design and the multi-blade capacity of each structural handle, the system scales systematically, providing massive gauge capacity across three organized, premium product offerings:

The SixStringers Precision Nut Slot File System represents the absolute pinnacle of the tooling market—delivering an uncompromised mechanical solution that guarantees geometric slot perfection and flawless string performance.

• MusicNomad Diamond Coated Nut File Specifications and Keel Design Documentation.
• StewMac Gauged DiamondCut Nut Slotting File Set and Nut File Backer Clamping Handle Documentation.
• Field Audits and Microscopic Boundary Evaluations of Abrasive Matrix Plating Failures on 0.15 mm Substrates.