A New Spindle Motor for Boxford 125TCL CNC lathe.
by John
The spindle motor on my 33 year old Boxford CNC lathe has struggled to machine steel, although it copes with brass OK. My expert friend has recently upgraded his machine (identical to mine) with a new spindle motor, and I will do likewise.
The new motor is a 750 watt Servo, bought on Ebay from China.
It is more powerful than the original DC motor, small enough to fit the limited space in the 125TCL, and my friend reports that it is performing very well indeed.
Some modifications to the mounting system and drive pulleys and electronic controls will be required.
For reader Tom, who is upgrading a 125TCL as a school project, I include the following photo.
On-off switch of the 125TCL.
johnsmachines 
Photo 2
1 off Kraus & Naimer cam switch.
2 positions 90 degree. Number of switch banks not shown (possibly 2)
Ordinary switchboard style.
Might also be a maintenance/ safety switch with provision for a padlock to lock the switch in the off position.
http://www.krausnaimer.com.au
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Hello,
How have you got on with the servo as a spindle motor? I’m just converting a Boxford 240tcl and not sure how to control the original 180v dc motor driver. The servo would surely make screw cutting accurate if the servo encoder can be used assuming no belt slip.
Thanks,
Chris
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Hi Chris, the servo is excellent. quiet. powerful. screw cutting perfectly. John.
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Hi John,
How did you wire up the servo motor? Are you using a servo driver to power it up?
Thanks,
Chris
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