Options for replacement lathe spindle motor

[depronman]

Seconded on the 3 phase motor and vfd
This is the setup I use on my boxford BUD cnc conversion
A one horse power motor is more than enough
I still have the pulley options but rarely change it from the middle pulley
The motor is set up for 50% over speed
So I can get upto 2000 rpm at the headstock
And back gear is available if I need silly amounts of torque
Motor came with the lathe and is a brooks motor. I changed the jumpers to delta wind
The vfd is a £50 Chinese affair but other than the dinglish manual it’s been fine for two years

Cheers. Paul


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[Doddy]

Seconded on the 3 phase motor and vfd

Holy thread revival, Batman! :-)

You've described pretty much what I ended up doing, and it's worked... to a fashion. My biggest problem resulting from the above is getting closed-loop control back into LinuxCNC, and (recognising after the event) tuning the PID in LinuxCNC with the VFD PID. I always ended up with either oscillation or slow ramp rate when changing spindle speed that took seconds (or tens of seconds) to stabilise. I did try tweaking many times but never got to where I wanted it. Coupled with the clumsiness of the countershaft etc, and my desire to remove that, and the third-party spindle encoder has sent me down a different path with light-at-the-end-of-the-tunnel, which involves removing much of the original lathe and replacing the spindle motor with a 2kW servo. That's working quite well at the moment but this weekend's job is re-boring a new timing pulley to fit the servo shaft (the reamer went for a wander on the first one). Pics may follow.