Messages

901

General Mach Discussion / Re: New cnc machine running but....

« on: November 11, 2016, 08:24:13 AM »

Word of caution on using the 36v supply on a 36v driver - it will have no or little headroom for over voltage caused by back emf when slowing down.

902

General Mach Discussion / Re: New cnc machine running but....

« on: November 11, 2016, 06:58:44 AM »

It should increase the capacity to change speed better, they can reach speed faster if settings allow it, they will get a little warmer only if current is changed as well - this needs to be set at motor limit not over, steps per will NOT change - this is a hardware setting.

903

General Mach Discussion / Re: New cnc machine running but....

« on: November 11, 2016, 06:32:38 AM »

I would certainly look at stepping up to 24v, 12 is way too low i think.

904

General Mach Discussion / Re: Is CV still calculated if stepping through a program line by line?

« on: November 10, 2016, 02:10:28 PM »

Just an observational thought but i don't see how it can be - as each block ends surely its the same as exact stop? Can't be in CV if its stopped.

Just a thought.

Interesting question.

905

CS-Lab / Re: IP-A and Servo drives, voltage matching...

« on: November 10, 2016, 05:41:47 AM »

Thanks,

i had a look at the link but the terminology is totally different so could not apply it to my system.

I will re-read the earlier posts and have another play this weekend hopefully.

906

CS-Lab / Re: IP-A and Servo drives, voltage matching...

« on: November 10, 2016, 02:18:19 AM »

Thanks, that does make sense, we have some older machines at work with manual drives and they had to be tuned properly so i think i know what type you mean.

I will revisit the tuning this weekend and see what happens.

The Flop sounds very similar - the CS-Labs have a graph and easy to set variables so its not too hard to do - the hard part is knowing what to look for and when to back off.

Also what speed do you tune at?

Needs a concise write-up i think, should help many users - any takers???

907

General Mach Discussion / Re: Spindle (AC Servo vs VFD)

« on: November 10, 2016, 02:14:03 AM »

Money seems to be the biggest down-side to this fun

The motor will be good, i kept the gears too.

I know nothing of cnc lathes so can't comment here but AFIK step/dir servo is pretty much as easy as a stepper system.

I think, that when using ENC for threading it must be reading the spindle direct so after any gearing etc. but as i said i am not sure.

908

General Mach Discussion / Re: New cnc machine running but....

« on: November 09, 2016, 07:35:50 AM »

Not surfier its the problem or just a symptom but it sounds like the acceleration is set really really low - it takes a very long time to slow and speed up.

Could be resonance in the motor maybe?

Sure someone will be along to help out.

909

CS-Lab / Re: IP-A and Servo drives, voltage matching...

« on: November 09, 2016, 05:58:11 AM »

Thanks, that really does read as a complex process and some skill needed

I know the parameters are all there, but the manual gives no help at all, does not describe them very well and just presumes the user would enter a simple motor code and all will be well - this does not take any notice of what load you have on the motor though which seems important to me I think??

Tuning the drive sounds like the answer but with little knowledge and no display - its just LED numbers, I would not know where to start really, the supplier was of little help as expected "Just enter the motor code" was the reply.

The CSMIO controller does have a good graph display on the PID screen but as it states in the manual, if the drive is not tuned correctly it is a waste of time trying to get a good setup.

Drive manual link below...

910

General Mach Discussion / Re: About V.B. script

« on: November 09, 2016, 03:12:34 AM »

The speaker is usually just two wires, they usually go to a post pair marked "spkr"

They do get knocked or left off easily.