Skip to main content
Abrasives and belt grinding in a working knife shop

Abrasives

Grinding and Sharpening 52100: Belt Recommendations & Technique

Belt recommendations, grit progression, and sharpening tips for grinding 52100 on a 2x72 belt grinder. Free guide from Torus CNC's ForgeBrain.

1 min readWritten by Rich LinvilleFree to read

52100 grinds slightly more demandingly than the simplest carbon steels in this database, its chromium carbides give a bit more wear resistance and a bit more belt wear, but it remains well within the easy-to-moderate range compared to premium stainless steels like CPM S30V or CPM 20CV.

Plain unhandled knife blank with rough grind marks beside a flattened brown belt showing light silver metal loading.

Belt Selection

Standard aluminum oxide or zirconia belts handle 52100 well. Ceramic belts are a reasonable step up if grinding this steel regularly, but not strictly required the way they are for high-carbide CPM steels.

Brown aluminum-oxide and blue-green zirconia belt strips lying side by side on a dark bench, grain and cloth edges visible.

Grit Progression

StageGrit
Profiling / heavy stock removal50
Bevel refinement80
Pre-finish120
Finish grinding220

Technique

Standard technique applies well: moderate belt speed, light controlled passes, and a coolant mister or frequent water dips to protect the temper. If working from reclaimed bearing stock, plan for the normalize and grain-refinement steps before grinding, since that prior processing affects how cleanly the steel grinds later.

Rough forged knife blank in dark scale cooling on a raised wire rack, with a cold steel bearing ring on the bench behind.

Sharpening

52100 sharpens well with standard sharpening stones and its very fine grain lets it take an exceptionally keen, stable edge. No diamond or CBN abrasives are strictly required, though they can speed up sharpening sessions.

Hands hold a small knife with its bevel flat on a wet sharpening stone in a dark holder, slurry along the edge.

Keep reading

Read these related guides

Three more from the same bench.

More in this topic
  • Glowing red-hot knife blade plunged into quench oil, flames and smoke rising in a dark shop
    Heat Treat

    Heat Treating Knife Steel: Complete Guide

    Heat treating is what turns a piece of flat bar stock into a functional knife blade. Done correctly, it transforms the steel’s internal crystal structure…

    Read the guide
  • Knife blade design in a working knife shop
    Abrasives

    Choosing a Motor & VFD for Your 2×72

    Every Torus ships as a complete assembled chassis with the motor sold separately — which hands you the one decision that shapes the machine’s personality…

    Read the guide

Same bench

Put the reference to work

I machine the parts, hand-assemble, track and test Torus grinders in Sterling, Illinois. Most orders ship in seven to ten business days from time of order.

See the whole shop
  • Classic aluminum 2x72 grinder, side view with flat-platen tool arm and yellow Safety Rules label, on black with a purple glow

    Torus 2×72 Classic Aluminum Belt Grinder

    Prior-design aluminum chassis, 90-degree tilt and 1.5-inch tooling arms.

    Starts at$1,095View

One-man shop

Still stuck? Ask me.

I answer my own email. Tell me the steel, the machine and what it is doing, and I will tell you what I would try next.

Ask Rich a questionBuild your Nova