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jnwinkie
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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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jnwinkie
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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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tommylight
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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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jnwinkie
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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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rodw
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25 Oct 2020 03:38 #187159 by rodw

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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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tommylight
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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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jnwinkie
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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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rodw
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26 Oct 2020 01:20 #187263 by rodw

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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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jnwinkie
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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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CBEAR
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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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