My Newb Plasma Table Attempted Build

Clive S
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15 Jun 2020 18:05 #171756 by Clive S

Replied by Clive S on topic My Newb Plasma Table Attempted Build

I did a cut yesterday 10 mm thick and and the start wavered a bit like yours.
photos.app.goo.gl/nV4Gqmym43gZ7TMG6

I was wondering if this is the sort of the same as you

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dvn4life1972
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15 Jun 2020 18:20 #171758 by dvn4life1972

Replied by dvn4life1972 on topic My Newb Plasma Table Attempted Build

Clive wrote:
I did a cut yesterday 10 mm thick and and the start wavered a bit like yours.
photos.app.goo.gl/nV4Gqmym43gZ7TMG6

I was wondering if this is the sort of the same as you

That looks odd. I have no idea if it could be the same issue though. I just tried another square with a perpendicular lead-in at a corner and no issue. When I moved the lead-in to the middle of that side the issue was there, so since yours started at the corner I would tend to believe it isn't the same issue. Almost looks as if the axis got shifted mechanically somehow.

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tommylight
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15 Jun 2020 18:21 #171759 by tommylight

Replied by tommylight on topic My Newb Plasma Table Attempted Build

Clive wrote:
I did a cut yesterday 10 mm thick and and the start wavered a bit like yours.
photos.app.goo.gl/nV4Gqmym43gZ7TMG6

I was wondering if this is the sort of the same as you

That is thermal distortion, the part moved during cutting as it was getting heated as can be seen from the delta at the beginning of the cut. Granted you did not move the part by hand. Thick materials will always move, so when space permits i add weights wherever possible.

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Clive S
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15 Jun 2020 18:32 #171762 by Clive S

Replied by Clive S on topic My Newb Plasma Table Attempted Build

tommylight wrote:

Clive wrote:
I did a cut yesterday 10 mm thick and and the start wavered a bit like yours.
photos.app.goo.gl/nV4Gqmym43gZ7TMG6

I was wondering if this is the sort of the same as you
That is thermal distortion, the part moved during cutting as it was getting heated as can be seen from the delta at the beginning of the cut. Granted you did not move the part by hand. Thick materials will always move, so when space permits i add weights wherever possible.

Erm I would have thought that the ct off would have moved the part was 1000mm by about 180mm 10mm the rest of the cut was fine. Although it is probably at the limit of the 40 plasma.

The cut was started on the scrap piece 10mm before the main part.

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tommylight
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15 Jun 2020 19:53 #171765 by tommylight

Replied by tommylight on topic My Newb Plasma Table Attempted Build

Clive wrote:
Although it is probably at the limit of the 40 plasma.

40Amp ?
That is a struggle to cut, but it looks like it did work nicely.

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phillc54
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15 Jun 2020 23:27 #171787 by phillc54

Replied by phillc54 on topic My Newb Plasma Table Attempted Build

Are your #1,#2,#3 & #4 in the order the files appear left to right in this post

I just want to orient the pics to match the code.

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dvn4life1972
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15 Jun 2020 23:34 #171790 by dvn4life1972

Replied by dvn4life1972 on topic My Newb Plasma Table Attempted Build

phillc54 wrote:
Are your #1,#2,#3 & #4 in the order the files appear left to right in this post

I just want to orient the pics to match the code.

The numbers I marked on them correspond to your files left to right. Remember they are marked upside down (X/Y zero is top right)

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phillc54
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16 Jun 2020 04:23 #171815 by phillc54

Replied by phillc54 on topic My Newb Plasma Table Attempted Build

#1 and #2 are the same cut beginning and ending at the bottom centre but with reverse direction. The step in them looks to me like a classic case of backlash. It looks like the fourth leg of the cut (Y direction) has come up short.

#2 and #2b are identical but with the Y motors swapped around. The step in #2b looks a bit more pronounced but that may be the picture resolution.

#3 and #4 are the same cut beginning and ending at the left centre but with reverse direction.
#3 looks to me like backlash. It looks like the fourth leg of the cut (X direction) has come up short.
#4 doesn't make sense to me at all, the fourth leg of the cut (X direction) has grown... Are you sure that wasn't a repeat of #3?

I think your table is possessed :evil:

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Clive S
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16 Jun 2020 07:43 #171819 by Clive S

Replied by Clive S on topic My Newb Plasma Table Attempted Build

tommylight wrote:

Clive wrote:
Although it is probably at the limit of the 40 plasma.
40Amp ?
That is a struggle to cut, but it looks like it did work nicely.

I have cut this for a friend that has made over 100 routers from 10'x5' vertical to small ones like 1000 by 600 but not done a plasma build but I am slowly converting him PlasmaC and LinuxCnc

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rodw
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16 Jun 2020 08:44 #171820 by rodw

Replied by rodw on topic My Newb Plasma Table Attempted Build

What made it pause?

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My Newb Plasma Table Attempted Build

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