Originally Posted by
NC_jimbo
Obviously I'm a newbie and I have an opportunity to pick up a 25" travel ballscrew. Am I thinking right that if the thing has 25" of true travel than that should be good enough for a 24" desired working area. I'm thinking 24" of travel + 1/4" each side for optical limit switch + 1/4" each side for a little spare.
It is unlikely to be long enough. You need to take into account the width of the gantry or whatever the ballscrew is driving.
If it is a router gantry, say 3" wide, you will loose a couple of inches there. then there is the Z-axis, with a router attached, there is an inch or 2, assuming you have the z-axis off centre.
I'd suggest your usuable travel is more like 18", maybe 20"
Cheers,
Peter.
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