Re: [CAD_CAM_EDM_DRO] Re: CNC Plasma cutter

THC is mostly used for warpage of the sheet while cutting and some
sheets are not perfectly flat, if you can't control the torch head it
can jam or bind and inconsistant torch height will vary your kerf. Not
sure what you mean by water cooling, never heard of doing that with
plasma. For some design ideas check out plasmacam.com, not associated
with them, just use them.
Darrell

jfglass2001 wrote:

>All I intend on cutting is 3/16" and occasionally 1/4".
>I do intend on it being water-cooled.
>What does a THC accomplish? If all my parts are generous tolerances,
>and of a larger size (6"x6") is a THC necessary?
>As for the main frame, the entire thing is going to be aluminum
>extrusion with bracing in strategic areas. I'm not too intent on
>extreme accuracy. I am also not intending to sell these. It's just
>for a little hobby of mine.
>--- In CAD_CAM_EDM_DRO@yahoogroups.com, Hal Eckhart <hal@c...> wrote:
>
>
>>On 9/22/04 2:27 PM, turbulatordude wrote:
>>
>>
>>
>>>you need to get a machine that is rated for 100% duty cycle.
>>>
>>>
>Cutting
>
>
>>>a sheet that will take 30 minutes will make lessor machines bug
>>>
>>>
>out.
>
>
>>True, but not every sheet is 1/2" thick.
>>
>>
>>
>>>Second, a Torch head height control...
>>>
>>>
>>I'd sure like one, but without it I only screw up about one piece
>>
>>
>out
>
>
>>of a hundred. Okay, maybe fifty. And I'm not that careful, my
>>
>>
>torch is
>
>
>>fussy, and most of my cross bars are missing about a quarter inch
>>
>>
>in
>
>
>>the center of the table. And steel usually isn't flat. However, a
>>
>>
>THC
>
>
>>would make the cuts prettier.
>>
>>
>>
>>>I looked at a table a few years ago. I figureded on welding the
>>>
>>>
>frame
>
>
>>>and grinding all the welds down flat and then haveing the bed heat
>>>treated to be stress releaved. One reason is that if they do it
>>>right, they can make it really really flat in that process. Makes
>>>grinding easier.
>>>
>>>
>>This may be a good method, but it sounds like a lot of work to me.
>>
>>
>I
>
>
>>just used 2x2 tube, and mounted the x axis track to it. The 2x2
>>
>>
>doesn't
>
>
>>bend under normal use and the track can be leveled easily enough.
>>
>>
>My
>
>
>>cross supports are strips of 1/8" aluminum about 5 inches wide
>>suspended in a big tub of water.
>>
>>I think having a water table helps things stay flat more that a
>>
>>
>perfect
>
>
>>worksurface does. One of the first things I did with it was to cut
>>
>>
>1/8"
>
>
>>copper in the shape of a fern. For a 4' fern, it was about 40' of
>>
>>
>cut.
>
>
>>Without cooling, the sheet puckered up like crazy in about a
>>
>>
>minute.
>
>
>>You can also get by in a pinch by spraying water on it while it
>>
>>
>cuts,
>
>
>>but this gets boring and makes an awful mess in the shop.
>>
>>Just my 2 rusty plugs.
>>
>>Hal Eckhart - Casa Forge - Minneapolis MN -
>>
>>
><http://www.casaforge.com>
>
>
>
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