Re: [CAD_CAM_EDM_DRO] shafting question

> I have used lotsa Thomson linear ways and ball-bushings, which is what I
> ASSUME you mean by this question.
>

Yes

> End-ony supported 1/2" shafting may be "OK" for 4" between supports, for

any

> metalworking machine. In other words, NO! Use continuous support!

Better:

> Use the newer-concept "grooved" THK rails, or crossed-roller type rails

(have

> seen only in pictures, never used, yet).
>

I'm not familiar with the THK grooved rails, but I do have a catalog next to
me with Del-Tron Crossed-Roller rails... $420 for one 11.8" long piece -
ouch! WAY out of my price range. That would wind up more than $2400 in rails
for a 3-axis machine.
For continuous support, I was thinking of using frelon open bearings w/ the
ceramic coated linear shaft assembly from Pacific Bearing. The shaft &
support are one piece of 6061T6. That was still more $ than I had in mind,
but it looks to be the most cost effective solution I've been able to find
so far. It's still cheaper than Thomson pre-drilled rail + the supports.

Thanks for your help!