Light Machine Corp. Benchman XTr (retrofit)

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22 Jun 2018 03:26 #112742 by project-pegasus
U25-7 has +4.77 V, but U25-5 has 0 V.and if I'm reading this right, it looks like U25-5 is the power for the U10 microprocessor. Why would that be zero volts? U25-6 has +5 V. Just to be sure I probed U10-14 and was 0 V also.

In regards to the Tx and Rx signals at J2, the Tx signal at TP6 looks static, but Rx at TP7 looks much more "active",on the scope, if that makes sense?
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22 Jun 2018 15:22 #112774 by x-Intelitek Engineer
If U25-5 is low, then the system thinks it is in the middle of a power fail.
U25-5 will only be low when U25-4 is below 1.25V.

Is TP1 +5V when referenced to TP19?
What is the voltage on U25-4?
If it is lower than 1.25V, check R1 and R2.

Attached is the MAX705 Pin Descriptions.

U10 power is through Pin 44(+5V) & Pin 22(GND).
Attachments:
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22 Jun 2018 19:10 #112782 by project-pegasus
It turns out I was measuring the wrong pins on U25. Pin 5 does have +5V, so it doesn't look like that's the problem.

I talked to tech support at Intelitek today and they do have a few of the ATC cards still in stock, for over $1000. And they need the old card in order to swap out the logic chips to the new card. So if the chips are the problem there's really nothing they can do.
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25 Jun 2018 11:46 #112841 by x-Intelitek Engineer
Was there any chance they would test/evaluate yours?
I'm not sure why they would need your chips, they should have the programs. Perhaps it is the availability of the physical chips.
The last time I spoke with them, they still had a couple of the XT type machines there and were doing testing for others with them.
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26 Jun 2018 00:09 #112863 by project-pegasus
Yes, they will do a evaluation of the board for a pretty reasonable fee. They said they do have a working XT that they are able to test the ATC boards on. This is probably my next step.
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05 Jul 2018 16:30 #113480 by steve_a
I replaced the controller in my BenchmanXT and have it working well. I have to manually change out the tool but that is not really a big deal. Still, I would like to use the ATC. Everything works. If I set up the spindle and the height, I can activate the pnuematics and change out a tool. Here's my problem. I have the spindle running on a velocity PID. How do I index it to accept the tool? I could just take the pin on the spindle out and just rely on the drawbar, but I'm not sure that's wise. Any suggestions?

Thanks!
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05 Jul 2018 16:49 #113481 by andypugh

steve_a wrote: I have the spindle running on a velocity PID. How do I index it to accept the tool?


You need to switch to a different (position-mode) PID.

This diagram might clarify.

wiki.linuxcnc.org/uploads/orient.svg

(Ctrl + will make it bigger on most browsers)
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