Diamond Dot Magnetic Discs

Diamond Dot Magnetic Discs – Quick-Change Diamond Laps for Flat Lap & Faceting Machines

Our Electroplated Diamond Dot Magnetic Discs combine the convenience of instant magnetic attachment with the consistent cutting performance of a diamond dot pattern surface. The dot pattern distributes diamond abrasive evenly across the lap face while allowing water and swarf to escape between the dots — keeping the cutting surface clean and cool during wet grinding. Available in four sizes from 6" to 14" and nine grits from 60 through 600, these discs snap instantly onto any magnetic master lap plate for tool-free grit changes between grinding stages.

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Available Sizes, Grits & Pricing

Diameter Available Grits Price
6" 60, 80, 100, 140, 200, 270, 325, 400, 600 $8.00
8" 60, 80, 100, 140, 200, 270, 325, 400, 600 $10.00
12" 60, 80, 100, 140, 200, 270, 325, 400, 600 $40.00
14" 60, 80, 100, 140, 200, 270, 325, 400, 600 $60.00

Grit Selection Guide

Grit Stage Application
60–80 Coarse grinding Rapid material removal, initial shaping on rough stone
100–200 Medium grinding Surface smoothing, facet refinement
270–400 Fine grinding Pre-polish surface preparation, scratch removal
600 Ultra-fine / pre-polish Final smoothing before polishing lap stages

Key Features

  • Magnetic backing — Instant tool-free attachment to magnetic master lap plates and turntables
  • Diamond dot pattern — Even diamond distribution with water and swarf escape channels between dots
  • Electroplated diamond coating — Consistent cutting performance and even wear across the disc face
  • 4 sizes available — 6", 8", 12", and 14" to suit all flat lap machine sizes
  • 9 grit options — Complete grinding sequence from 60 through 600 grit

Related Tools

Frequently Asked Questions

  • Q: What is the advantage of a diamond dot pattern over a solid diamond surface?
    A: The dot pattern creates open channels between the diamond dots that allow water and stone swarf to escape during wet grinding — keeping the cutting surface clean and preventing the disc from loading up with debris. This results in more consistent cutting performance, better cooling, and longer disc life compared to a fully solid diamond surface.
  • Q: What machines are these magnetic discs compatible with?
    A: Diamond dot magnetic discs are compatible with any flat lap machine or turntable that uses a magnetic master lap plate. The magnetic backing snaps instantly onto the plate without tools or adhesive. Always verify the disc diameter matches your machine’s magnetic plate size before ordering.
  • Q: What is the difference between 6" and 14" discs?
    A: The 6" and 8" discs suit standard hobby flat lap machines and faceting units. The 12" and 14" discs are designed for larger professional flat lap machines and turntables used in high-volume lapidary and glass grinding operations. Choose the size that matches your machine’s magnetic plate diameter.
  • Q: Should diamond dot magnetic discs be used wet or dry?
    A: Wet use is strongly recommended. The dot pattern is specifically designed to channel water across the grinding surface during wet use. Keep water flowing over the disc during all grinding stages to cool the diamond surface, prevent glazing, and extend disc life.
  • Q: How do I change grit on a magnetic lap system?
    A: Simply lift the current disc off the magnetic plate and snap the next grit disc in place — no tools, no adhesive, no waiting for PSA to bond. The magnetic attachment holds the disc firmly during grinding and releases instantly when you lift it off. This makes multi-stage grinding workflows significantly faster than PSA disc systems.