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24 Oct 2020 01:48 #187058 by jnwinkie
Replied by jnwinkie on topic Stuck
Thanks Tom;

So it sounds like I have a failed build. Do I approach the finance minister for a new plasma cutter that supports THC? If so which one would be best?

PlasmaC still curious?

No sure where to from here.

Cheers

John

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24 Oct 2020 01:51 #187059 by jnwinkie
Replied by jnwinkie on topic Stuck
Thanks Rod;
Humidity in Vic is not too bad, but will explore a drier. Maybe a moot point if I can't get the thing to cut!

Thanks again for your feedback.

Cheers.

John

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24 Oct 2020 08:02 #187075 by tommylight
Replied by tommylight on topic Stuck

jnwinkie wrote:
So it sounds like I have a failed build. Do I approach the finance minister for a new plasma cutter that supports THC? If so which one would be best?

Not really, i mostly use older hand manual plasma cutters modified for machine cutting, so most probably yours can be modified too.
You do need a THC, preferably the Mesa THCAD 10 and two 1MOhm resistors, a reed switch, some wires and two relays.
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25 Oct 2020 02:50 #187157 by jnwinkie
Replied by jnwinkie on topic Stuck
Thanks Tom;

What do you to covert torch to machine torch or not? I found cut speed helped, a lot slower that on the box. More like 700mm/min.
Will the THCAD work with parallel BoB?

Thanks
John

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25 Oct 2020 03:38 #187159 by rodw
Replied by rodw on topic Stuck
John, yes you can use the software encoder component with a BOB and a THCAD. It is a bit less precision that way. Tommy will know more as he's done a couple. I think he used 2 x BOB's

See linuxcnc.org/docs/2.8/html/man/man9/encoder.9.html

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25 Oct 2020 18:30 #187211 by tommylight
Replied by tommylight on topic Stuck
Yes the Mesa THCAD does work with a parallel port as i had two of them working, one is still in use every day from the start of this year and never had a single issue, the other was in use about 2 months till i got the Mesa 7i92, so now i have 2 of THCAD connected directly to Mesa 7i92 inputs, both in use daily.

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25 Oct 2020 23:56 #187257 by jnwinkie
Replied by jnwinkie on topic Stuck
Thanks all;
Some success, I cut these castor plates from 3mm sheet.
I had some dross but it came away with a light tap from a hammer.
I think the speed can be increased slightly, it is currently at 700mm/sec but suspect it could go up to about 900mm/sec.

Cheers
John
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26 Oct 2020 01:20 #187263 by rodw
Replied by rodw on topic Stuck
if you can knock the dross off you are pretty close to perfect. There should be almost none. Read up on high speed dross and low speed dross.
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26 Oct 2020 01:35 #187264 by jnwinkie
Replied by jnwinkie on topic Stuck
Thanks Rod;

I have looked it up and I am getting straight lines rather than the slightly S shaped cut lines as described on the hyperthem site. How do those plates look to you?

www.hypertherm.com/support/system-suppor...lity/too-much-dross/

Cheers

John

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26 Oct 2020 11:02 #187292 by CBEAR
Replied by CBEAR on topic Stuck
I'd probably drop your cut height to 1.55mm or .060" and slow down the cut speeds to like 80% of what you are currently cutting at and see what happens

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