New Plasma build question

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03 Aug 2019 02:27 #141245 by rodw
Replied by rodw on topic New Plasma build question
Clive, I was at the shop so I took a couple of photos for you.

This one shows the adjustment screw I spoke about. Just below the left hand carriage. Its probably worth mentioning the two black wires attached by screws are grounds back to the star grounding point for noise control.



Yes, the microswitch is the lower z axis limit. This shows my inexperience. I should swap the switch around with the striker plate so the wiring does not move.


And the blue sensor here is for the breakaway. YOu can see the adjustment screw here again.



So I barely have 10mm of movement in the float switch but it is enough to trigger the prox sensor shown in the second photo. In practice now with Plasmac it never goes off!
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03 Aug 2019 08:01 #141258 by Clive S
Replied by Clive S on topic New Plasma build question
Thanks Rod for the pic.

Have I got this logic correct.

Does the total Z axis (on the screw) move down until the torch hits the part then it keeps moving down until the floating head switch trips.

When this switch trips does it then does move the total Z axis up until the floating head trips again.


Do you also use soft limits on all axis. (I generally do ) but don't have a limit switch on -Z because its impossible to know the tool length on a mill.
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03 Aug 2019 09:07 #141259 by tommylight

Clive s wrote:
Does the total Z axis (on the screw) move down until the torch hits the part then it keeps moving down until the floating head switch trips.

When this switch trips does it then does move the total Z axis up until the floating head trips again.

Yes.
Again, sorry for missing that.
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03 Aug 2019 12:35 #141268 by rodw
Replied by rodw on topic New Plasma build question
Sorry, I realised I had not answered your question but have not been near a PC but Tommy chimed in with the answer..
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12 Aug 2019 18:34 - 13 Aug 2019 17:50 #141978 by Clive S
Replied by Clive S on topic New Plasma build question
Update to my Plasma build photos.app.goo.gl/HXqug653tA31R7K9A

Mechanics now done.

Mesa THC-10 built into box on top of cut40 with a 1W 1meg R in each leg from the terminals

Now to start on the control box with a Mesa 7i96.
Last edit: 13 Aug 2019 17:50 by Clive S.

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12 Aug 2019 18:41 #141981 by tommylight
For some unknown reason my phone refuses to show the picture !
I wonder...... disabled to many things so not easy to pinpoint what is going on.

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13 Aug 2019 00:00 #142008 by rodw
Replied by rodw on topic New Plasma build question
Looks awesome Clive. I was trying to work out from your photos how the X axis was driven by that stepper at the rear of your gantry.

It might only be small but it looks a serious bit of kit!
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13 Aug 2019 14:57 #142028 by tommylight
I can see ! I can see ! The pictures i mean. :)
Looks nice .
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13 Aug 2019 17:52 #142056 by Clive S
Replied by Clive S on topic New Plasma build question

rodw wrote: Looks awesome Clive. I was trying to work out from your photos how the X axis was driven by that stepper at the rear of your gantry.

It might only be small but it looks a serious bit of kit!


Thanks

I have altered the link in the previous post so that you can see the back of the machine
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17 Aug 2019 08:44 #142373 by CNCFred
Replied by CNCFred on topic New Plasma build question
Dear all,
I just to make sure I got this right.
1.Torch is negative , clamp is positive.
2. Grounding the cnc table with elektronics of cnc and to power ground is not a problem even 1.?

I am playing around to make my own thc controller using voltage devider, ina219 and a esp32.

3.Not clear to me is if the 7i76e can be fed with up down data using relays.

4. Maximum voltage is 300V dc? the arc ok voltage? Hystheresis is 3 volts on which voltage? Around?

Thank you,

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