Re: [CAD_CAM_EDM_DRO] Re: please help........

Ouch....
On the 5/8 inch ballscrew being whippy. I bet I know why the poster wanted to use that particular diameter....for some reason it happens to be the cheapest by far (both 1/2 and 3/4 are much more expensive from MSC or Mcmaster-carr). I was going to build a gantry using a 5/8 inch ballscrew...secured at both ends of course. Mine was only going to have a travel of 30 inches by 24 inches...I wonder how whippy that would have been at high speeds.
Tim Goldstein wrote:You line of thinking is a false economy. Virtually none of the parts from
one machine will work right on the next unless you are going to design from
scratch to use them. You state that your next machine will be a large
gantry. So what are you going to do with this one puny ball screw? Also
gantry's tend to need high travel speeds and a 5/8" ball screw is pretty
whippy for that.

Finally, you are looking to convert this first machine in a way that will be
far less than optimum. If you don't capture the far end of the lead screw it
will whip if you are going to have any rapid above a snails pace. You want
to mount everything in places that will not let the force be applied evenly.
You don't want to hear the advise of people that have done what you are
looking to do.

OK, here is the advise I think you want to hear. Fabulous idea. Go for it
and take lots of pictures. Keep us updated on your progress.

There you feel better about the project now?

Tim
[Denver, CO]

----- Original Message -----

> why would i spend all the time to convert the machine
> and then disassemble it and sell it??? because i may
> decide to build a large gantry mill and use the
> components. thats the whole reason for not wanting to
> also modify the ballscrew, as it is not machined at
> the far end.
> by capturing the far end of the screw, i assume you
> mean with a mounted bearing of some sort. as i just
> stated, its not machined an that end.



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