PM25 BLDC spindle drive replacement from Anaheim Automation

A BLDC drive from Anaheim Automation is tested as a replacement to stock spindle drive of the PM25 mill. The stock drive is not documented, lacks a fault signal, and responses slowly to direction and speed changes limiting rigid tapping. The Anaheim Automation MDC300-120151 drive has advantages but with the…

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Rigid tapping and thread milling on a PM25 LinuxCNC mill

Rigid tapping and threading milling are attempted on a Precision Matthews PM25 LinuxCNC CNC conversion. To allow rigid tapping, a spindle encoder is added by attaching a rotary encoder to the top of the drawbar. The differential signals from the encoder are converted to single-ended and then passed to the…

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R8 Drawbar Upgrade For PM25 Mill

The drawbar on the Precision Matthews PM25 mill is difficult to torque properly with its unusual 8mm square head. In this video we replace the standard drawbar with a new one with a 3/4" hex head, similar to those used on Bridgeport mills. This work was done to ensure proper…

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