Centroid Community CNC Support Forum

I'm using smaller taps, 10/32, 1/4-20 spiral taps, in aluminum. The G84 canned cycle decelerates 0k, Parameter 37, before the M3 to go out is called. I'm still tweaking it for this machine. Definitely a learning process. I can work with my spindle speed dilemma. Will post when perfected. Its only a ...

Great Marty, thanks for you viewpoint. I have already rigid tapped and cut steel. I only wanted to know if i could get the M3/4 speeds corrected. I got it thanks. I'll post once finished. Appreciate your input.

For Info:
My analog wires are all properly shielded. The results of my test are as follows: 0 RPM = 0.195V, 100 rpm = 1.195 Volts, 200 rpm = 2.196 Volts etc. All the way up ca. 0.195V +- a couple mV. I've worked with Stephen at DMM and I can set the deadzone in the servo to keep it from rotating at ...

Still working with DMM on this issue. When its finished I'll post all about this DMM servo as a spindle motor. Depending on where the MAX SPEED is set causes spindle to rotate, or not on power up. For example: Max Speed set to 50, servo does not rotate on power up. However, all "M3/M4 S" calls are ...

Marty,

You mentioned the analog voltage check using 1000 rpm. Each 100 rpm 1 volt. What if that is not the case, say less than or more than 1 volt? Is there a way to correct this in ACORN? Thank you.

Gentleman,

I will post all about this spindle servo soon with pictures and video. Its working great except commands from Acorn MDI for example: M3 S500 turn on to 440 RPM, subsequent commands S600 to 540 RPM and so forth. I'm satisfied its always 60 RPM low. But why? Is there a way to tweak Acorn ...

No problem, got it going. I'll make a video and write a post this weekend.

Thanks, I'll let you all know the out come.

Gentleman,

Please find my latest report attached. I have this small lathe with a DMM 750W servo fitted and a DYN4 drive. It is wired up with the Acorn per DMM drawing with encoder attached to Acorn. It works ok, however, MDI commands are not accurate. These are of course based on servo settings in ...

PROBLEM SOLVED

Thank you gentleman for the input. My questions were answered fully. The sample programs were spot on. A great forum.