Re: [CAD_CAM_EDM_DRO] Re: Max feedrate of ball screws?

I know this "drifts" a little from "max feedrate of ball screws",

But, My next homebuilt Router style machine over 36" in any direction, will have Rack and Pinion. I've got an Old Digital Tool 6'X10" Router at the shop to play with. The thing Flat out Flies.

Accuracy can be measured within .005 overall, and if I throw a "short throw" dial indicator on it, and make a .002" move via software command, (which is by the way this things current resolution), By
diggidy, That's about what shows up on the Dial.

This is an old machine, and I have not done anything to try to limit slop or backlash. Lot's can be done to Rack and pinion to gain accuracy, at least to the point that the manufacturer sells his rack.

I also Built Plasma cutter with Rack. Of course what do you need in regards accuracy here ? But it works excellent.

In my book, Ballscrews on a large machine are only necessary If you absolutely have to have super duper accuracy. Don't forget, on a large machine, you better have a Floor, or a Laser Leveling System
to get that accuracy over a large area. I'm Liking Rack more and more every day for your "Typical" Router. Rack is Cheap, You can "Glue" it on with Loctite 609, and replace it easily if you wear it
out.

For smaller machines like Engravers, Small Routers Etc. Screws are still OK, And a bit more affordable when Short.

Chris L