Bob's Plasmac Build

Some more work on the uprights. Needs some tig work.

Looks good Bob. Hope you don't mind a couple of questions:
How thick is steel you are using?
So with those servos you use you don't need to bother with reduction drives? That sounds like it makes fro a much easier build over the steppers I used.

I am using 1/4" steel. I am not done as I am putting ribs on the uprights so they should be plenty rigid enough.

These servos I dont think will need reduction. It is right on the border so we will see. If it does there is planetary gearbox fits right on shaft and mount for the servos, so thats my backup plan.

The gantry will weigh less than 80 lbs so the servos should have enough torque.

Bob

I am sure that you will be able to make your table work. Actually the problem is a bit more complex than just matching torques if one wishes to get optimum performance from your hardware. I thought that it was just a simple torque matching problem when I wanted to change out my stepper drives for servo drives. The corporate servo engineer pointed out the many errors in my plans. The drive problem is actually an impedance matching problem ( power transfer) and must be approached from that stand point if you want optimum performance from the smallest (least $) drives. I have attached a Kollmorgan paper on the subject if you are interested. Like I said before I am sure you will be able to make your table work.

John

islander261 wrote: Bob

I am sure that you will be able to make your table work. Actually the problem is a bit more complex than just matching torques if one wishes to get optimum performance from your hardware. I thought that it was just a simple torque matching problem when I wanted to change out my stepper drives for servo drives. The corporate servo engineer pointed out the many errors in my plans. The drive problem is actually an impedance matching problem ( power transfer) and must be approached from that stand point if you want optimum performance from the smallest (least $) drives. I have attached a Kollmorgan paper on the subject if you are interested. Like I said before I am sure you will be able to make your table work.

John

That paper makes my head hurt.

I have allotted for planetary gearboxes in my design. If direct drive is not sufficient enough, I will add gearboxes. It is a plasma so therefore I have no cutting forces so at least that is in my favor......

Mig City....