Downdraft design questions

It's a start.

The pneumatic plumbing on the inside of the table is complete. The copper lines terminate at a bulkhead, which is attached to the duct 'tray'. It all slides out as one piece.

Looks fantastic. Can't wait to see how it works.I was given a DXF file for a 8" blast gate yesterday. I'm still pondering how to put mine together. How much space do you have from the bottom of the slats to the bottom of the tray?

Should the air rams be covered to protect from falling sparks do you think?

rodw wrote: Looks fantastic. Can't wait to see how it works.I was given a DXF file for a 8" blast gate yesterday. I'm still pondering how to put mine together. How much space do you have from the bottom of the slats to the bottom of the tray?

Would you mind sharing?
I will have to measure from the slats to the bottom of the tray and get back to you. Making a reminder to myself now.

rodw wrote: Should the air rams be covered to protect from falling sparks do you think?

That's a good question. You are likely to have your exhaust table running before me, I still have to get LinuxCNC to move the gantry around! I went ahead and removed the electronics and computer that I had been using. Hopefully that will force me to get this one running with LinuxCNC. I got some motors turning on the bench, but that is not the same.

I read through your thread (on another forum) where you documented the entire spaceship build. You are a madman, but you have a really cool spaceship!

txtrone wrote:

rodw wrote: I read through your thread (on another forum) where you documented the entire spaceship build. You are a madman, but you have a really cool spaceship!

That thread on plasmaspider is an impostor! (Well just a summary of my build)
The real thread is here on this forum forum.linuxcnc.org/show-your-stuff/32029...cutter-build?start=0

All 69 pages of it. Man I have to bust through that number its kinda suggestive!

Its been a long journey, my Spaceship!

This madman is kinda time poor right now so there is no guarantee the spaceship will fly on a cushion of air before yours does!

I found this pic

See: safe-welding.com/extraction-table-7-fact...cted-during-cutting/

I kinda like how there are no sliding shutters to get stuck and how the air ram uses the hatch it opens to shield itself against sparks. I think I might use a dual rod air ram if I go this way.

I think your only problem with your design will be the plasma dust building up on your rams and being abrasive. I know first hand how destructive the plasma dust can be.

A simple cover over the top should keep them safe, apart from that its taking shape nicely.