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

Chris, you mentioned about the plasma cutter.
Ever since I saw a laser cutting machine about 14 years ago I wanted to have
something similar. How clean your plasma cutter cuts and how exact?
How much electricity does it take?
Regards, Alex

----- Original Message -----
From: Chris L <datac@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, December 06, 2002 8:17 PM
Subject: 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
>
>
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