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Messages - jaja

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General Mach Discussion / Re: Spndle Calibration
« on: September 30, 2010, 06:46:03 PM »
Hy Slammers
About your index pulses: could it be caused by the fact that you've got more then one pulse per revolution?
For as far as I know mach 3.042 only works with an index pulse, which is one pulse per revolution.
Look at this PDF for a very good explanation

gr jaja

General Mach Discussion / Re: Mach3 Spindle Speed Problem
« on: September 22, 2010, 06:19:13 PM »

Command Mach3 to go to any speed (say 750RPM) via the Spindle Speed Dialogue Box or MDI

When the spindle is running, press the override "up" arrow twice.  You will notice a destinct drop in RPM on the first press of the arrow and then the spindle will respond normally on the second and subsequent presses.

I have monitored the PWM steam out of Mach3 with my CRO and the PWM mark to space ratio (duty cycle) changes accordingly so the problem is definitely with Mach3.

Any hints as to how to correct or overcome this would be greatly appreciated.



Did you ever solved this problem from October 2008?
I have exactly the same problem. Command a lower speed, and the spindle speed will drop much to low before climbing up to the desired speed , and also hitting the override up button first drop the speed.
Found an answer???

gr jaja


Have a look at my experiences at www.cjh.com.au/PWM Spindle Control using Mach3.pdf

Hope it helps.



You cant realise how much you helped me with your PDF document.
I followed up your guide of how to make your spindle work,, and now, at last it works!! Super! Thanks.

One question: what number is on your "index debounce" in config > general config> index debounce, since you have a device for a DC output?

gr jaja

General Mach Discussion / Re: Constant Surface Speed.
« on: September 22, 2010, 12:14:50 PM »
Hi Jim,

its all in there just waiting for you to tell it when to move.

Try this code :-

Zero out at some point in fresh air.

G21 (Metric)
G40 (Clear offsets)
G95 (Set feed per rev)
G00 X50. Z0 (Move to start point)
G96 S75 M3 (CSS 75 Metres/min)
G01 X10. F.1 (Feed at .1/rev)
G00 X50. Z1. (Rapid clear)
M30 (End)


It is an old post,,,, but it helped me very much.
Could not get any further,, I always got the maximum spindle speed,, until I read your message to zero out in fresh air.
Now I can use Constant Surface Speed. Great.

Thank you very much for this part of code.  :D

gr jaja

General Mach Discussion / Re: MDI input to select pulley ?
« on: August 31, 2010, 05:27:37 PM »
Perhaps a stupid idea, but I made a clone from the pulley select DRO input/ output control in the diagnostic screen.
You know where it says "spindle pulley" at the bottom left on the diagnostic screen.
I copied such a button to the manual screen and I think I can select a pulley with it by selecting it and typing the pulley number in it.
I think it works because it tells me when it is too fast for a pulley, which corresponds with the values I assigned to this pulley.
Is this a way to select a pulley or am I totally wrong

gr jaja

General Mach Discussion / Re: RPM not under 38
« on: August 30, 2010, 03:06:09 AM »
Thanks a lot Rich,
This is about a servo spindle motor I think, but there is a lot of information I can use.
I start trying right now.
 gr jaja

General Mach Discussion / Re: RPM not under 38
« on: August 29, 2010, 06:15:37 PM »

General Mach Discussion / Re: RPM not under 38
« on: August 29, 2010, 06:04:54 PM »
Thanks Hood,
There are six pulley's. But the problem at this moment is that there is no correct RPM number at all. The number is much higher than it should be. And Mach is totally not reacting the way it is supposed to be. It never reaches the RPM which is asked for.
I just came out of the workshop, tried all kind of settings for a long time, but it just doesn't work.
There must be something wrong at the basis I think

How does the "calibrate spindle" work?
There is on thing on this screen that has a wrong setting. In the middle of the calibrate screen it says: "Pulses per revolution, Zero if 1 per rev".
I've got one pulse per revolution, since I have one reflecting slot, but the number in the screen is 1, and not 0.
Does this mean I did something wrong? You cannot change the 1 into a 0.

In the "calibrate spindle" screen you can enter a number under control. What is the meaning of this? Is it possible to measure the real RPM's with a device and enter this number there?

gr jaja

General Mach Discussion / Re: RPM not under 38
« on: August 29, 2010, 03:01:11 PM »
Hallo Hood,
First I tried you idea and emulated the index input. But no result.
Later, with some help, I found out that the "spindle pulley configuration" probably messed things up. Changed some things, and now for the first time, mach tries to match the S- true with the demanded speed. Great, never got this far!
The minimum measured RPM is now under 38 RPM. Was this also caused by the pulley settings?

There are still a lot of things that must be configured.
Right now I'm trying to figure out how the P I D is optimised.
And how must the spindle pulley's be configured in the best way. Pulley number four is the standard pulley?? And what are the numbers that must be entered there? The minimum and maximum spindle speed?
Are the ratio's of the other pulley's to be measured very exactly, or is it not stringent?
Thanks for your help, without it I would never got this far
gr jaja

General Mach Discussion / Re: RPM not under 38
« on: August 23, 2010, 05:54:32 PM »
I'll get the idea, but in ports and pins, input signals,, which signal stands for the spindle? Do you mean the "index"?
gr jaja

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