How to Use a Dual Handpiece Rotary and Hammer Brush

By Pepetools - Precision Engineered Professional Equipment | Published: 2026-10-24

Category: How-to Guides

Learn how to set up and operate a dual handpiece brushless kit with rotary and hammer brush functions for precision jewelry making and metalwork.

Quick Answer

Use a dual handpiece brushless kit by selecting the rotary handpiece for cutting, grinding, and polishing, and the hammer brush handpiece for texturing, setting, and riveting. Proper collet selection and speed matching are critical to avoid damaging your workpiece or tool.

Rotary vs. Hammer Brush: When to Use Each

The rotary handpiece in a dual handpiece brushless kit is ideal for continuous rotation tasks like drilling, carving, and sanding. It delivers smooth, variable-speed power for precision work on metals, stone, and wax.

The hammer brush handpiece uses a percussive action (like a miniature jackhammer) for texturing metal surfaces, setting stones, or driving rivets. It is not designed for drilling or sanding—using it for those tasks can damage the tool and your workpiece.

A common mistake is swapping handpieces without adjusting the speed. The hammer brush typically requires lower speeds (under 10,000 RPM) for controlled impact, while the rotary can handle higher RPM for cutting and polishing.

Collet Sizes and Bit Compatibility

Most dual handpiece kits accept 2.35mm (3/32") collets as standard, with optional 1/8" collets available. Always match the collet to your bit's shank diameter exactly—using the wrong size can cause bit slippage, vibration, or breakage.

For hammer brush work, use only bits rated for impact or percussive use. Standard rotary burrs can shatter under hammer action. Look for bits labeled "hammer-safe" or "for impact tools."

Step-by-Step Guide to Using a Dual Handpiece Kit

Select and Install the Correct Collet: Identify the shank diameter of your bit (e.g., 2.35mm or 1/8"). Choose the matching collet and insert it into the handpiece. Tighten the collet nut securely with the provided wrench—do not overtighten, as this can deform the collet or damage the bit. Check that the bit is centered and does not wobble when you spin it by hand.
Set the Handpiece Speed: For the rotary handpiece, start at a low speed (5,000–10,000 RPM) and increase gradually based on the material. For the hammer brush handpiece, keep the speed under 10,000 RPM—higher speeds reduce impact control and may overheat the bit. Always test the speed on a scrap piece before working on your final piece.
Attach the Handpiece and Lock the Motor: Insert the handpiece into the motor housing until it clicks. Engage the spindle lock (if available) to prevent rotation while tightening or loosening the collet. Never force a handpiece that does not align smoothly. If the handpiece does not lock in place easily, check for debris in the connection or a misaligned keyway.
Perform a Test Run: With the bit installed and handpiece locked, turn on the motor at the lowest speed. Listen for unusual vibrations or grinding sounds. Gradually increase to your working speed while observing the bit's behavior. Excessive vibration usually means an incorrect collet size or a bent bit—stop immediately and recheck.
Work with Proper Technique: For rotary tasks, use light, consistent pressure and let the tool do the work. For hammer brush tasks, hold the handpiece at a slight angle and allow the percussive action to texture the surface—do not press hard or drag the bit sideways. Keep the handpiece moving to avoid creating deep gouges or overheating a single spot.
Clean and Store the Handpieces: After use, remove the bit and collet. Wipe down the handpiece exterior with a dry cloth. Store the handpieces in the kit case or a padded drawer to prevent dust and impact damage. Never submerge the handpiece in liquid—use compressed air to blow out debris from the collet area.

Product Highlight

K-1053Dual Handpiece Brushless Kit - 2.35mm (3/32 or 1/8) Collet Rotary Brushless and Hammer Brush: The K-1053Dual Handpiece Brushless Kit includes both a brushless rotary motor and a hammer brush-type motor in one system, available in 110V or 230V. You get two specialized tools in one kit, saving bench space and allowing quick switching between rotary and percussive tasks without changing machines.
K-1053Dual Handpiece Brushless Kit - 2.35mm (3/32 or 1/8) Collet Rotary Brushless and Hammer Brush