I am about to convert either a PM-728VT or PM-833VT mill. I read most of the threads on this forum and have found the information to be fantastic! I am hoping you can answer a few questions:
- With respect to upgrading the spindle motor to an inverter rated motor, I am unclear as to the reason why you need to modify the motor mount. I plan on using the same PDB from Greg Priest. Is this because a motor with an exact fit is very costly? My goal is to increase the low-end torque and increase the spindle speed to 5000 to 6000 rpms. I will not necessarily be doing rigid tapping. If I were to use a sensorless Vector VFD, do you know what max rpm is possible with the original motor?
- When adding the VFD to the Mill, did you have to add any RF filters or chokes to reduce electrical noise?
- The images of the Mill enclosures look great. One quick question. If you are planning on using mist lubrication (like a fog buster) and will not be using flood lubrication, do you need to slope the bottom of the enclosure. Would a flat bottom work? Is there something I am missing regarding the need to slope the bottom of the enclosure?
- With respect to tools slipping from TTS holders, here is an interesting video from Cliff at Threadexpress that gives some interesting insights: R8/TTS vs BT30 Spindle Tapers - Part 1 - YouTube
I hope you find it helpful.
Thanks again… Richard