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Messages - grifftek

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Are there any mach 3 users in the Los Angeles area that would be interested in getting together to discuss mach and cnc stuff in general?

I am in Santa Fe Springs

Bill

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Original posts snipped!

Thanks for the reply Hood and Scott! I was hoping there would be more opinions and suggestions with all the activity on these groups but maybe I should have posted individual posts instead of one big one.

I have been busy with some other things and will probably have some more specific questions once I get back in the shop.

Thanks
Bill Griffin

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General Mach Discussion / Re: Mach 3 hiccups - Please Help
« on: June 04, 2008, 05:02:52 PM »
On the machines I have retrofitted I have always used Solid State Relays to switch things on and off. I have never encountered any noise problems or strange glitches this way. I have however sorted out a few problems where snubbers and diodes have cured noise problems on other machines and retrofits. I have even used the SSR to control large contactors without any snubbers without problems.

YMMV

Bill

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Hi
 
I am currently retrofitting my first mach3 machine. I have retrofitted many machines using the ahha control but this is my first experience with mach.
 
The machine is a dyna 2800 and I am using a mach motion control cabinet with touch screen. The rest of the system is PMDX 131, 135-8020, 122, and a 106 for the spindle. The machine has a brushless AMC servo amp and motor. Axis drives are gecko G201
 
Currently I have 3 axis of motion and spindle control under mach.
 
I have a few questions I'm looking for suggestions on how to best handle them:
 
1. Spindle driver fault signal from the AMC servo amp.
 
I would like to have a separate input for this signal which would estop the system but show a spindle drive fault.
 

2. Spindle power supply over current circuit breaker
 
I would like to have a separate input for this signal which would estop the system but show a spindle power supply fault.
 

3. Spindle mechanical brake
 
On my ahha machines I have simply added a line to the M03, M04, and M05 m-code map file to enable and disable the brake. I'm not sure how to implement this in mach3. I would also like to have an m-function for the brake also.
 
I will control the electro mechanical magnetic brake with a 120 VAC solid state relay controlling a 24vdc power supply.
 
4. Oiler
 
Answer to #3 will solve this one as well.
 

5. Axis drive power supply
 
Currently the Axis drive power supply is controlled by at 120 VAC solid state relay driven by the charge pump circuit on the PMDX board.
 
This works but I don't like to remove power from the stepper drives every time there is a e-stop condition as the drives will loose position. On an ahha system, pushing estop caused all axis to ramp to a stop leaving the drives powered on. Returning from a e-stop condition didn't require resetting home and part zero.
 
I would like charge pump #1 to control the pmdx boards which would be disabled when in estop. The spindle power supply SSR is also connected to this charge pump.
 
I would like to use the second charge pump output to control the axis drive power supply and stay powered up during estop. I know about the check box to make this work this way but it seems that it only applies to the first charge pump. I would use a stand alone charge pump circuit for this.
 
In the beginning it was suggested I just hook the pc power supply 12 volts to the axis power supply SSR. This worked but as the pc powers up there are some glitches on the axis drives.
 
Anyone have any other ideas?
 
6. Auxiliary AC Outlet
Answer to #3 will solve this one as well.

7. Resolution (steps per inch)
 
The machine is currently configured to run at 50,800 steps per inch. The drives are 10 microstep G201 and I don't have the G901 boards installed.
 
The machine runs very smoothly but the resolution is quite un useable and this hurts the performance with the step limitations of mach3. I am running the kernel speed at 60K per machmotion.com's recommendation.
 
I am trying to decide whether I should just buy the G901 boards and reduce the drives resolution or just buy the smooth stepper board. Any opinions?
 

I welcome opinions and ideas and reference on how to deal with this.
 
Thanks in advance
 
Bill Griffin
grifftek @ grifftek . com
(cross posted to the mach support forum also)

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