New Build - Gantry question

[ClarKent101]

Hi all, I have a table I'm about to put together with a Hypertherm 45xp plasma cutter. I started this project a while back but intend to finish it now.

The gantry and motors I have still yet to source - is there an "easy" way out of this? I'm thinking of using aluminium extrusion for the gantry and then having plates cut to mount it to the sides, then sliding on a linear rail.

What size typically would I use for the motors, are there any kits available to take a lot of this work out of it. Does anyone have any recommendations for the size of gantry that would typically be required?

Thanks.

[acourtjester]

Ok I will throw out my method, I use a totally welded steel table. The reason is with all the quick movements a Plasma CNC makes, bolts come loose. I have built both 4X4 and 4X8 table, would not go below a 4X4, because of the sheet size (4X8 normally, cut in half or quarters for easy of handling). I use nema 23 425 oz-infor the Y and Z axis, and nema 43 965 oz-in for the X .
https://www.ebay.com/itm/163050002999?h ... Swdc5bX9df only buy the free shipping ones
https://www.ebay.com/itm/153506253946?h ... Sw7KVc7jwB this kit has 3 motors and drivers I keep on for other projects.
and I use the UCCNC type interface, and use the BOB board from the kits to this will give you more input and output pins. This is what I use you con hook 2 BOBs to it. https://www.cnc4pc.com/uc400eth-etherne ... ler-b.html module and software is about $220.
the 4X4 table I have now I use for Plasma cutting (Water Table), wood Routing, Drag Knife, Metal scribe, Pen Plotter, and now Laser etching. These are made easy by having the optional mounts to change out.

2 tables 4x4 and new 4x8.JPG

4x4 table.JPG

[ClarKent101]

Nice build! why would you go Nema 43 vs. Nema 34 of similar torque? I notice a lot of people go Nema 34.

I'm using the Mesa Ohmic sensor as well with Linux CNC. Need to source the z axis guides as well - any good sources for these?

[acourtjester]

I missed typed your right nema 34

I sent you a PM from here

[adbuch]

Tom - do you use some sort of "idler" to tension the chain drives?
Thanks,
David

[acourtjester]

Yes sir at each end of the chain is a 3/8" bolt that is used to tension the chain. Having a dual drive (each side of the table) these tensioners can slightly adjust each side to keep a parallel for cutting square with the table. I also use a 1" flat bar to support the chains full length, the stops any flop when changing direction. Excuse the pink paint, what the lady wanted.

DSCN4101.JPG

DSCN4063.JPG

DSCN4062.JPG

[adbuch]

OK. Thanks Tom! Now I understand your technique.
David

[plasmanewbie]

Pretty cool design Tom!!

[acourtjester]

Ah shucks 2 Gif file.gif

thanks