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Messages - Promech

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31
General Mach Discussion / Re: Index pulse in Lathe
« on: April 19, 2011, 07:14:20 PM »
By Control I mean turned off and then on the computer and repeated the test.

Installed V3.042.033 just to discard a Mach problem.

I just ran a test with code generated with the threading wizard and the problem remains.  The resulting thread has a fishbone shape.  As the tool penetrates more in each pass it is also displaced a small amount in Z, therefore this shape.

I may have backlash, but I am sure its neglegible compared to error the thread is showing.

This behavior makes me suspicious of my Z axis setup.  Will check that tomorrow.

Jorge

32
General Mach Discussion / Re: Index pulse in Lathe
« on: April 19, 2011, 04:33:01 PM »
I upgraded to the latest lockdown version R3.043.022.  Upgrading was very simple.  The threading problem did not go away.  I did some tests and the behavior is repeatable. I was able, with three similar passes go over the same path.  The trick is that I had to offset each pass by 0.17mm.  I turned the control on and off and the behavior was the same. I am attaching the program file I used for testing.  Maybe I should ´downgrade´ to R3.042.033 which has been proven to work well with others.  I would like to know however if anyone can understand this behavior before reinstalling again.

Thanks,

Jorge

33
General Mach Discussion / Re: Index pulse in Lathe
« on: April 19, 2011, 09:00:56 AM »
Thanks all.  To be practical the entire Mach3 directory should be backed up...

34
General Mach Discussion / Re: Index pulse in Lathe
« on: April 19, 2011, 12:52:11 AM »
Rich, I got a very rigid and accurate machine.  The control is on an Emco CNC lathe that is in very good mechanical condition. It has a repeatibility of 0.005mm or less. From this post and other posts on the subject it seems as the problem is clearly related to the Mach version I am using.

Questions. 

1. If I upgrade (meaning I install a new version).  Which is the best way to configure the new version.  I have spent a lot of time configuring the existing version (including modbus communication) motor tunning etc.. Are there configurations files I can save and then transfer on to the new version?

2. If my existing version is licensed, how do I make the new version licensed.  The downloads which I find are demo versions.

3. Will any upgrade above 3.042.32 work? The latest one seems to be 3.043.022.  Is this the one I should download?

Thanks,


Jorge

35
General Mach Discussion / Re: Index pulse in Lathe
« on: April 18, 2011, 10:13:29 PM »
Running Version 3.042.029

I am observing that the index pulse signal goes on and off with an unstable frequency.  I do not know if this has any meaning. How should it behave.  Should it be constantly on?

Thanks,

36
General Mach Discussion / Re: Index pulse in Lathe
« on: April 18, 2011, 08:56:21 PM »
Yes I did and still having trouble.  Could there any reason why the RPMs read o.k. and the thread trayectory is random?  The pitch seems to be o.k.

Thanks,

37
General Mach Discussion / Index pulse in Lathe
« on: April 18, 2011, 01:08:50 PM »
Hi all,

I am testing my lathe with threading.  My index pulse is generated by the machine original encoder.  The signal is fed to a bb board where it is supposed to be properly conditioned and then on to Mach.  The RPM reading seems to be accurate and stable.  But when I do threading the thread cut is not repeating its trayectory.  I have used both the G76 cycle and G32.  Any ideas what could be going on?

The fact that there is a an RPM reading makes me think the signal is o.k.  My threading is all within max feed limits.

Thanks,

Jorge

38
General Mach Discussion / Re: Power Supply +Se amd -Se sigal
« on: January 24, 2011, 12:01:03 PM »
Tweakie,

Thanks for your explanation.  I would assume then this is only useful if a voltage drop is anticipated. If not then one could just jump the +5V with the +Se and the -5V with the -Se terminals.  If this is incorrect please let me know about it.

Jorge

39
General Mach Discussion / Power Supply +Se amd -Se sigal
« on: January 24, 2011, 10:11:06 AM »
Got a used power supply from an old CNC control and intend to use it.  Besides the usual 110VAC, 12VDC and 5VDC terminals it also comes with terminals labeled +Se and -Se.  Could anyone of the electronics experts out there please give me a brief explanation of what are the purpose of those?

Thanks,

Jorge

40
With industrial servos the drive can display the position error in real time  (the difference between the encoder feedback position and command value).  In my initial trials these errors show mostly in acceleration and desceleration movements (G0) but when cutting is initiated with G01, G02 and G03 the system has had time to catch up.

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