[lfleiva]

Hi!
A lot has been said about the max speeds achieved by several on Series 1 mill retrofits ranging generally from 50 up to 200 IPM with the original and new steppers and servos. Being 120IPM the max speed of the original textron control.

But most of the time the acceleration used is not indicated. Does any one knows the acceleration used in the original Textron Bridgeport mill?

I my case I am using three original Superior motors with 120IPM rapids and 5 in/sec/sec acceleration. Although I can get up to 150IPM and 10in/sec/sec but use lower to be on safe side.

Thanks in advance for any reply!

Luis

[Bob La Londe]

It's going to depend. Your servo drives ability to absorb surge voltage. Read me a hurco K MB one head up to 30 inches per second per second. And it was wonderful, but it kept cooking servo drives. At fifteen ISS it was pretty consistent. I COMPROMISED AT TWENTY. Remember for some types of work, acceleration will make more difference in job time. Than rapid speed or feed rate will. In my experimentation, I found peak feed break, capabilities and peak acceleration were not mutually compatible. For much of what I do if I had a choice between a hundred and thirty or six hundred and under ten i would take the one hundred and thirty.