PT80 Ohmic Cap

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Mr.Hotwire
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PT80 Ohmic Cap

Post by Mr.Hotwire » Thu Jul 22, 2021 4:46 pm

Since I have an ohmic sensor on the way, and It doesn't look like there is an ohmic cap for the IPT torches commercially available.. what have you done to support this? I have been looking at the various caps and shields, there MAY be a way to make things work using a modified cap / shield combo.

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acourtjester
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Re: PT80 Ohmic Cap

Post by acourtjester » Thu Jul 22, 2021 5:07 pm

There are videos on YouTube with different torches with a connection, not sure but think if you have a HV start you may not be able to use it. Some have used the Proximity sensors with place of an actual ohmic sensor (there are 2 types NPN and PNP).

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Re: PT80 Ohmic Cap

Post by adbuch » Thu Jul 22, 2021 9:14 pm

acourtjester wrote:
Thu Jul 22, 2021 5:07 pm
There are videos on YouTube with different torches with a connection, not sure but think if you have a HV start you may not be able to use it. Some have used the Proximity sensors with place of an actual ohmic sensor (there are 2 types NPN and PNP).

I'm not sure how having a High Voltage start would affect the process of ohmic sensing. The torch would lower until contact is made with the material thru the ohmic cap/shield, then raise to pierce height and fire the torch. Perhaps I am missing something here. I'm always willing to learn.
Thanks,
David

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djreiswig
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Re: PT80 Ohmic Cap

Post by djreiswig » Thu Jul 22, 2021 11:33 pm

Some people have had issues with some cutters because the shield is internally connected to the work lead. This won't work because the tip and plate are always connected. Not sure what brand of cutter is like this, but it's something to check.
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Re: PT80 Ohmic Cap

Post by adbuch » Fri Jul 23, 2021 12:08 am

djreiswig wrote:
Thu Jul 22, 2021 11:33 pm
Some people have had issues with some cutters because the shield is internally connected to the work lead. This won't work because the tip and plate are always connected. Not sure what brand of cutter is like this, but it's something to check.
Ok. That makes sense. Thanks for pointing that out. I suppose there might be a work-around by adding a separate ohmic probe not in contact with the shield. I think I remember seeing that done a while back. Or using a proximity sensor as described previously.
David

Mr.Hotwire
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Re: PT80 Ohmic Cap

Post by Mr.Hotwire » Thu Jul 29, 2021 4:16 pm

The highlighted parts are the ones needed for the PTM-80, FINDING them is the issue.
IPTM-80 Contact cut parts.PNG
IPTM-80 Contact cut part numbers.PNG

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adbuch
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Re: PT80 Ohmic Cap

Post by adbuch » Thu Jul 29, 2021 7:16 pm

I would recommend phoning Century Tool & Equipment to see if they can order them for you.
David

https://www.centurytool.net/PT_TORCH_PT ... 374783.htm

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djreiswig
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Re: PT80 Ohmic Cap

Post by djreiswig » Thu Jul 29, 2021 9:51 pm

Here's the shield from a Missouri seller.
https://www.ebay.com/itm/324279630161
No luck on the cap.
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