Which THC card for powermax 45

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26 May 2016 15:59 - 26 May 2016 15:59 #75117 by Todd Zuercher

Can someone tell me what the 5i25 and 7i77 cards are used for?


A 5i25 card is a PCI fpga card that can do hardware step generation, hardware pulse counting (reading encoders), and a few more tricks. The 7i77 card is a daughter board for the 5i25 (and some others) that is designed for controlling up to 6 analog servos, and has 48 points of isolated field I/O (32 inputs and 16 out)
store.mesanet.com/index.php?route=produc...oduct&product_id=120

Basically it is one option you can use to connect your Linuxcnc contol PC to a servo CNC machine.
Last edit: 26 May 2016 15:59 by Todd Zuercher.

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26 May 2016 18:35 #75120 by andypugh
Full list of the supported "tricks" here :-)

linuxcnc.org/docs/2.7/html/man/man9/hostmot2.9.html
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26 May 2016 22:19 #75125 by tommylight
5i25 is a "anything I O", basally a PCI card with 34 inputs or outputs (all pins are programmable as far as i know, as inputs or outputs independently).
Oh well already answered, moving on.
:laugh: :laugh: :laugh:
Tom
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26 May 2016 23:12 #75130 by BigJohnT
My Hypertherm 1250 has tip voltage and I used the first 0-10v THCAD with external voltage divider. Hopefully Peter will chime in...

JT
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26 May 2016 23:59 - 27 May 2016 00:00 #75131 by cruzinone
Let me ask this, if I get the thcad card do I also have to have the 5i25 and or 7177 card?
what i want to do is cut mostly flat stock 1/8 and 1/4 inch and use a rotary to cut tubing with.
Last edit: 27 May 2016 00:00 by cruzinone. Reason: more info

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27 May 2016 01:39 #75136 by cruzinone
Im so green I dont even know what the voltage tip is of my 45.

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27 May 2016 08:32 - 27 May 2016 08:42 #75141 by Rick G
There are many factors involved to get a quality cut.

Im so green I dont even know what the voltage tip is of my 45.

It will depend on what you are cutting.
There most likely is a cut chart in your manual. There you will find recommended cut height, pierce delay, voltage, etc.
As the distance from the work changes the arc voltage also changes, this is the information used for the THC.
There are many other factors that effect the voltage, but if you start with the recommended cut height, speed, voltage, etc. you have a good starting point.

There are Mesa THC demo configs loaded with linuxcnc for a Mesa card and a sample with parallel port. You might want to look at them. The description states that the parallel port may not be fast enough for good THC.

You can of course cut without a THC. Having used one for a while I would not like to go back.

Rick G
Last edit: 27 May 2016 08:42 by Rick G.
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27 May 2016 11:29 - 27 May 2016 11:32 #75146 by Rick G
As a side note those cut / feed tables will also give you a good idea of the feed rates you will be using during cutting so that you build your table with the proper capabilities. Cutting light gauge can be done at some pretty fast speeds.

I used a 7i76 for stepper control as opposed to a 7i77.
Rick G
Last edit: 27 May 2016 11:32 by Rick G.
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27 May 2016 12:16 #75151 by cruzinone
That is some good information. I really appreciate the tips. Just curious about what you said about stepper control, I thought the gecko did the stepper control.

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27 May 2016 13:58 #75159 by BigJohnT
Section 3 in your operator manual describes machine torch connections and it mentions that there is a 50 to 1 voltage divider built in to the circuit. So you get 0-6v from the signal with a maximum of 7v for open circuit. The THCAD-10 would be the only choice.

Gecko's are stepper drives, you still need to control them. A 5i25-7i76 PNG kit would be a good choice for a PCI slot and the 6i25-7i76 PNG kit would be a good choice for a PCIe slot.

Whew, I think I finally recovered from my short vacation and I'm almost caught up to as far behind as I was before I left.

JT
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