Messages

1

General Mach Discussion / Re: Newby with a question about Spindle Step/Dir setup

« on: October 19, 2008, 01:35:52 AM »

I am using the Spindle drive step/direction and not the axis drive.  My axis drives do accel and decel nicely like they should.  The spindle motor will accel just like I have it set up in the motor tuning and I thought should decel just the same but that is not the case.  Another thing that happens when changing spindle speed from lets say 1000rpm to 500rpm is that is immediately changes and when going from 500rpm to 1000rpm it will accel nicely up to the new speed.

2

General Mach Discussion / Newby with a question about Spindle Step/Dir setup

« on: October 18, 2008, 12:31:06 PM »

Hi I have been using Mach 3 for about a year now and love it.  I have a Enco square column bench mill I have converted to CNC.  I am using some Allen Bradley Ultra 100 servo drives setup in stepper follower mode.   I just put a servo in for the spindle motor and set it up for the same step/direction setup.  The problem I have is that it ramps up nice but when the spindle stop is set it does not ramp down.  It just stops suddenly.  I have a geared head so it is really hard on the gears when running at high speeds.  Is this a setup problem on my part or am I missing something.