Products for bench top machinists | LittleMachineShop.com

High Speed Spindle Kit, HiTorque Mini Mill

High Speed Spindle Kit, HiTorque Mini Mill - Main image
High Speed Spindle Kit, HiTorque Mini Mill - View 2
$45.47 $69.95 In stock

These pulleys change the spindle speed range to 5000 rpm max. The increased speed is great for small cutters such as those used for engraving. Just remember that doubling the speed will cut the torque in half.

It's important to have high speed bearings. Most LittleMachineShop.com HiTorque Mini Mills have high quality and high-speed bearings BUT the standard bearings on most mills are not rated to 5000 rpm. --see the Chris' Tips tab.

This high-speed spindle kit uses the same belt as the standard drive pulleys. The pulleys are easy, but if you have to change the bearings you have to press the spindle out and back in. A hydraulic press makes it an easy task. Switching pulleys to the original set shouldn't take more than 20 minutes.

*NOTE: We do not have installation instructions completed yet, so you are on your own for installation.

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Customer Reviews (5.0 / 5 · 5 reviews)

Ruby ★★★★★

I use this kit mostly for engraving with tiny end mills, and the 5000 rpm max really helps keep the cuts clean. It was straightforward to swap the pulleys, though you definitely notice the reduced torque at higher speeds.

Miles Z. ★★★★★

Installed these pulleys on my mini mill and the 5000 rpm top end makes engraving passes much faster. The torque drop at higher speeds is noticeable but expected, and the machining quality of the pulleys themselves was clean with no burrs.

Penelope R. ★★★★★

Swapped out the stock pulleys this afternoon and hit 5000 rpm without any fuss. The extra speed makes engraving with tiny end mills feel effortless, and the torque drop is honestly a non-issue for light cuts.