CNC Conversion Kit for HiTorque Mini Mills 6225  (Discontinued)Made in United States

CNC Conversion Kit for HiTorque Mini Mills
  • Heavy Metal CNC kit
  • Fits all HiTorque Mini Mills and mini mills with a 300 mm x 130 mm table.
  • 16 mm x 5 mm ball screws
  • Preloaded ball nuts for minimum backlash
  • NEMA 23 motor mounts
Part Number: 6225  (Discontinued)
Weight: 12.0 lb

Price: $699.00

This kit provides the mechanical elements you need to convert a Mini Mill with a 300 mm x 130 mm table to CNC. It includes ball screws, ball screw nuts, thrust bearings, and motor mounts plus the fasteners you need to install them. It does not include motors, drivers, power supply, or software. See the Documents tab for the electronics and software you will need in addition to this kit.

The ball screws are 16 mm diameter and 5 mm pitch, C7 grade with a tolerance of 30 microns over 300 mm.

All aluminum parts are clear anodized for corrosion and scratch resistance.

This kit is designed to be adjustable to any and all of the machines shown on the compatibility tab. Sometimes it just isn't possible. Because of manufacturing tolerances, there is variation from machine to machine. When installing the kit you may need to make some modifications not listed in the instructions.

Chris Chris' Tips
Made by HEAVY METAL, these kits are the most solid, rigid kit you can find. They have been on the market since 2006. They have had very few revisions in all that time.

The mini mill will need modifications to fit the top plate For Z Axis. You will need to drill 4 holes. All mods are explained in the instructions file.

See the Documents tab for the electronics that Heavy Metal recommends.

Here are the Installation Instructions

  • 3 ball screws. 16mm x 5mm pitch
  • 3  Ball nuts preloaded for minimal  backlash
  • X axis motor mount for Nema 23 motor
  • X axis ball nut block and bearing block
  • Y motor mount for Nema 23 motor
  • Y axis ball nut block
  • Z motor mount for Nema 23 motor
  • Z axis ball nut block & bearing block
  • Zero backlash helical couplings for X, Y, Z axis for 0.25” Dia. Motor shafts
  • Thrust bearing for all 3 axis
  • Stainless steel cap screws for mounting motors, and other hardware as needed


This product works with the following mills. (If your machine is not on this list, check with us before ordering.)

  • 4962 SIEG Mini Mill
  •   SIEG X2D Mini Mill
  •   SIEG X2L Mini Mill
  •   WEN 33013 WEN Mini Mill
  • 3900 HiTorque Mini Mill
  •   SIEG SX2L Mini Mill
  • 3960 HiTorque Mini Mill
  • 3990 HiTorque Mini Mill
  • 4190 HiTorque Mini Mill
  •   SIEG SX2LF Mini Mill
This item ships directly from our supplier in Texas to you. It might be a day or two longer before it ships, and you will receive it in a separate package from other items on your order. You might receive this item a few days before or a few days after you receive items shipped from our warehouse.

Recomended Electronics


3 - Nema 23 motors 425oz/in, KL23H2100-50-4BMC
3 - Nema 23 drivers, KL-5056 20-50VDC 5.6A
1 - 48V/7.3A power supply 110VAC/220VAC
1 - 5V power supply, KL-10-5
1 - C10 6-Axis breakout board, connect X,Y,Z, limit switch and E-stop
1 - UCCNC software
1 - Aluminum box up to 6 axis, with E-stop, Switch, Power outlet, Fuse, 4 motor connectors

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1 - Laptop computer running Windows 10 

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