Foredom vs. Dremel vs. Micro Motor: Which Rotary Tool for Finishing?

---

You've got the abrasives. Now what do you run them on?

This is one of the most common questions we get: "I bought Cratex wheels — what tool should I use?" The answer depends on what you're finishing, how much control you need, and what's already on your bench.

Here's the honest breakdown.

The Three Options

Dremel / Rotary Tool ($40-$120)

The Dremel (or generic rotary tool) is what most people start with because they already own one.

Pros:

  • Inexpensive and widely available
  • High RPM range (5,000-35,000)
  • Compact — easy to maneuver on knife blades
  • Accepts all standard 3/32" shank mandrels and Cratex wheels

Cons:

  • Low torque — bogs down under pressure on harder steels
  • Motor is in the handpiece, so it's heavier in your hand
  • Vibration increases with wear
  • Collet system can slip at higher loads

**Best for:** Hobbyist knife makers doing occasional finishing, small touch-ups, and anyone who already has one and wants to try rubber abrasives before investing in a flex shaft.

Foredom / Flex Shaft ($200-$400)

The flex shaft is the standard tool in jewelry studios and serious knife shops. The motor hangs overhead, and a flexible cable drives a lightweight handpiece.

Pros:

  • High torque — maintains speed under load
  • Lightweight handpiece (motor is separate)
  • Smooth, low-vibration operation
  • Quick-change handpieces available (collet, Jacobs chuck, etc.)
  • Built for all-day use
  • Accepts all 3/32" shank Cratex wheels and points

Cons:

  • Higher upfront cost
  • Requires a hanger or mount
  • Cable can develop stiff spots over time (replaceable)
  • Lower max RPM than a Dremel (typically 18,000 max)

**Best for:** Anyone doing regular finishing work — serious knife makers, bench jewelers, production shops. This is the tool you'll eventually buy if you stick with the craft.

Micro Motor ($150-$600+)

Micro motors (NSK, Marathon, Saeshin) are compact, brushless handpieces common in dental and fine jewelry work. The motor is inside the handpiece but uses brushless technology for less vibration and heat.

Pros:

  • Extremely smooth — almost no vibration
  • Precise speed control
  • Compact and lightweight
  • Very quiet
  • Long-lasting brushless motors
  • Forward/reverse switch

Cons:

  • Lower torque than flex shafts (not ideal for aggressive work on hardened steel)
  • More expensive for equivalent quality
  • Some models use proprietary collets (check before buying)
  • Less common in knife making shops

**Best for:** Jewelers doing fine detail work — prong finishing, bezel cleanup, stone setting prep. Also excellent for precious metal finishing where vibration = mistakes.

Comparison Table

RPM Recommendations by Wheel Size

Regardless of which tool you use, match your speed to the wheel:

All Cratex wheels and points use standard **3/32" mandrel shanks** that fit Dremel collets, Foredom handpieces, and most micro motor collets. No adapters needed.

See our [Tool Compatibility Guide](/pages/tool-compatibility) for the full compatibility chart.

So Which Should You Buy?

**Already own a Dremel?** Start there. Buy a [Knife Maker Starter Kit](/products/knife-maker-starter-kit) or [Jeweler's Starter Kit](/products/jewelers-starter-finishing-kit) and see what rubber abrasives can do. If you find yourself finishing regularly, upgrade to a flex shaft.

**Setting up a knife shop?** Get a Foredom SR motor with a #30 handpiece. It'll handle everything from coarse material removal to extra fine polishing, and it'll last 20 years.

**Bench jeweler?** If you don't already have a flex shaft, get one. If you want the best possible precision for stone setting prep and detail finishing, add a micro motor as a secondary tool.

**The tool matters less than the abrasive.** A Cratex fine-grit wheel on a $50 Dremel produces a better finish than bare sandpaper by hand. Start with what you have and upgrade when the tool becomes the bottleneck.

[Shop Cratex Wheels & Points →](/collections/all)

[Tool Compatibility Guide →](/pages/tool-compatibility)

[Knife Maker Kits →](/collections/knife-maker-kits)

[Jewelry Maker Kits →](/collections/jewelry-maker-kits)

---

*Not sure which setup is right for your work? Email elliott@finisherssupply.com — we'll help you figure it out.*

Back to blog