Here are the industry-standard recommended Surface Feet Per Minute (SFPM) based on the work-piece material you’re grinding.
| Material | Recommended SFPM |
|---|---|
| Aluminum | 4500 – 5000 |
| Brass / Bronze | 5000 – 6000 |
| Grey Cast Iron | 4000 – 5000 |
| Nickel / Chrome | 2500 – 3000 |
| Mild / Carbon Steel | 4000 – 5000 |
| Titanium | 2000 – 2500 |
| Tool Steel | 4000 – 5000 |
As a general rule, run a coarse 36-grit VSM Ceramic Plus belt at a higher RPM, and a fine 120-grit belt at a slower speed. You can buy VSM Ceramic Plus belts right here on the Nexus Grinders and Knife Supply website.
Calculating your SFPM
Here is a simple grid to work out your SFPM based on a 4″, 5″ or 6″ drive wheel on a 2 x 72 belt grinder.
We sell 4″ and 5″ drive wheels for your grinding needs.
Shop belts & drive wheels
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VSM Ceramic Plus Belts
Price range: $9.75 through $127.00 Select options This product has multiple variants. The options may be chosen on the product page -
Starter Pack – VSM Ceramic Plus Belts
$99.75 Add to cart -
3″ Aluminum Tracking Wheel with stacked bearings
Price range: $39.00 through $43.00 Select options This product has multiple variants. The options may be chosen on the product page -
Delrin Wheel 2″
Price range: $6.00 through $32.00 Select options This product has multiple variants. The options may be chosen on the product page -
Belt Cleaning Stick
$12.95 Add to cart -
2″ Aluminum Idler Wheels – set of 2 v1
Price range: $49.07 through $55.07 Select options This product has multiple variants. The options may be chosen on the product page -
5 inch Aluminum Drive Wheel
$78.00 Select options This product has multiple variants. The options may be chosen on the product page -
5 inch Aluminum Wheel Set 5/8 bore
Price range: $159.00 through $169.00 Select options This product has multiple variants. The options may be chosen on the product page
Frequently asked questions
What is SFPM and why does it matter?
SFPM (Surface Feet Per Minute) is how fast the belt surface travels. Too fast on a heat-sensitive metal builds heat and can ruin the temper or the belt; too slow wastes cutting efficiency. Matching SFPM to the material gives cleaner, cooler, faster grinding.
What SFPM should I use for steel?
Mild, carbon and tool steels run well at roughly 4000–5000 SFPM. Heat-sensitive metals like titanium (2000–2500) and nickel/chrome (2500–3000) need to run slower to avoid heat damage.
How does drive-wheel size change my speed?
For a fixed motor RPM, a larger drive wheel moves the belt faster (higher SFPM) and a smaller wheel slower. That’s why the SFPM grid is calculated per 4″, 5″ and 6″ wheel — swapping wheels is one way to change belt speed.
Should coarse and fine belts run at the same speed?
No. Run coarse belts (around 36 grit) faster for aggressive stock removal, and fine belts (around 120 grit and up) slower for control and finish. A VFD makes dialing this in easy.