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Angularity Issues

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TrinityFabworks
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Angularity Issues

Postby TrinityFabworks » Sun Oct 07, 2018 9:36 pm

I'm having two issues with cut quality. I've got a hand torch set up, and I can't ever seem to get it perfectly square.
1. Is there a trick anyone has to squaring up a hand torch first time?

2. I'm also having issues with random bumps in my cuts. I'm not sure if this is because the torch is not perfectly square so as it changes from a top taper to a bottom, or if it is where the thc is kicking in or what.

Ironken
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Re: Angularity Issues

Postby Ironken » Sun Oct 07, 2018 10:04 pm

Could you post a pic of your hand torch? Maybe one of us can come up with an idea for squaring. Would a machine torch be feasible for you? The hand torch setups seem to me to lack rigidity....imho.

TrinityFabworks
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Re: Angularity Issues

Postby TrinityFabworks » Mon Oct 08, 2018 7:29 am

I will try to get a picture of it by tonight

TrinityFabworks
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Re: Angularity Issues

Postby TrinityFabworks » Mon Oct 08, 2018 7:42 am

20181008_073112.jpg

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acourtjester
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Re: Angularity Issues

Postby acourtjester » Mon Oct 08, 2018 10:18 am

Looking at your torch holder 2 things come up better supporting the handle to make the holder more ridged. And also making sure the torch cable is not having an effect on the torches direction. Attached is a torch holder I made on my first table and another somebody made for their hand held torch.
new torch holder (6).JPG

hand held torch holder.jpg

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Ironken
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Re: Angularity Issues

Postby Ironken » Mon Oct 08, 2018 10:46 am

Just spitballin' here......how much pressure can you put on the torch handle before the torch deflects? Seems like there's not much rigidity in that torch mount. Could the torch be bouncing a bit causing issues? Could you make gussets from the horizontal piece to the vertical piece to better support the torch?

Or build a support for the handle like Jester suggested and maybe clamp a piece of longer stock the same diameter as the retaining cap in the torch mount. This way you would have a longer surface to check that the bore of the torch mount is actually perpendicular to to the table surface.

TrinityFabworks
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Re: Angularity Issues

Postby TrinityFabworks » Mon Oct 08, 2018 1:31 pm

I have a rod welded to the plate that I ziptie to the torch body to prevent it from wiggling around. Its on the other side of the torch

Ironken
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Re: Angularity Issues

Postby Ironken » Mon Oct 08, 2018 2:17 pm

Could the wiggle be where the horizontal piece mates to the verticle part of your z? Gussets maybe needed?

TrinityFabworks
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Re: Angularity Issues

Postby TrinityFabworks » Mon Oct 08, 2018 3:03 pm

Maybe, it's pretty rigid right there. Its got two countersunk bolts coming through the back side of the plate to hold on the mount and it is pretty tight.

Ironken
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Re: Angularity Issues

Postby Ironken » Mon Oct 08, 2018 10:56 pm

This may be a bit anal.....could you fix a dial indicator to the vertical face and touch off on different points and make some cuts to see where the flex is coming from? You can observe the indicator and see if there is any movement during the cut and what movement makes it happen. Mounting may be challenging since a mag base won't work for you.

I would think that a small amount of deflection at the torch could show up a couple inches away at your cut.

Euclid933
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Re: Angularity Issues

Postby Euclid933 » Tue Oct 09, 2018 2:50 am

I have had random bumps in cuts. I narrowed it down to the "Y" axis bearing supports.
Check that the X and Y axis move by hand without bumping or binding.

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Re: Angularity Issues

Postby jimcolt » Tue Oct 09, 2018 9:45 am

This is how to ensure good cuts. Machine torch with magnetic mount. Easy to inspect and change consumables, easy to clean, always perpendicular.


new pics 013.jpg

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TrinityFabworks
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Re: Angularity Issues

Postby TrinityFabworks » Tue Oct 09, 2018 3:01 pm

I made my magnetic mount locate on 3 ball bearings and 4 rare earth magnets (2 on each plate). I would love a machine torch, but at $650 for the xt40m, I can't justify it quite yet in my shop as this is just a hobby at the moment. I would like to eventually upgrade tables to a larger table, and sell this one, but space is limited right now. I don't want to put too much into this table when I plan on selling it in the future for a better machine.

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see&see
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Re: Angularity Issues

Postby see&see » Sat Oct 13, 2018 9:29 pm

Using the magnetic mount with the machine torch just like Jim posted above and auto height control set at 0.06 using the 65 amp process with new consumables in the picts below on 1/2" mild steel. You won't ever get a perfect 90 but this is about as good as I can do on angularity with very little dross.

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jimcolt
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Re: Angularity Issues

Postby jimcolt » Sun Oct 14, 2018 11:55 am

If you figure out what your time is worth, then calculate how much design and testing time you will use up designing and building your mount for a hand torch. Then, add in the time it takes for secondary operations (dross, angularity that force grinding and occasional scrap pieces) it takes very little wasted time even in a hobby shop to justify having a machine torch and a decent breakaway mount. Use the hand torch for cutting up the skeleton left after cutting on the cnc table with the machine torch, as well as for breaking down larger plates and sheets to fit on the smaller table. Jim Colt Hypertherm



TrinityFabworks wrote:I made my magnetic mount locate on 3 ball bearings and 4 rare earth magnets (2 on each plate). I would love a machine torch, but at $650 for the xt40m, I can't justify it quite yet in my shop as this is just a hobby at the moment. I would like to eventually upgrade tables to a larger table, and sell this one, but space is limited right now. I don't want to put too much into this table when I plan on selling it in the future for a better machine.


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