Air Spring Conversion Kit, HiTorque Mini Mills 

Convert torsion spring HiTorque Mini Mills to air spring.

Mini mills use a torsion spring mounted on the side of the column to support the head. This air spring conversion kit for mini mills provides all the parts required to change to a vertical gas strut that mounts inside and above the column.

With the air spring and Z-axis limit installed, you can move the mill head up until the top of the casting is flush with the top of the column. You can move it down until it contacts the adjustable Z-axis stop set in its lowest position.

Besides all the parts required to mount the air spring, this air spring conversion kit for mini mills also includes a longer Z-axis rack so you can take advantage of the longer head motion.

This air spring has about 35 pounds of force. This about enough to support the head, and it is a heck of a lot more support than the torsion arm provides.