Driving floating end (ballscrew)

[irving2008]

:lol: well I've been compared with worse ;) though James May's 'maths' on Top Gear often leaves a lot to be desired!

My take on this is that there is nothing wrong with getting a bit of rigour into the thinking.... and this is a good example to show how sometimes the little oversight can have big consequences...

more than happy to explain it...

[Gary]

I have had customers wanting to drive from the floating end, and while it is not ideal, it will most likely be ok.
All stepper motors have a wavy washer or two behind the back bearing so this can take up at least 0.5mm.
The coupling will also help.
On another note the thermal expansion would not be that much unless you are really working the ballscrew and it starts to heat up, a Z axis is not that dynamic with most moves happening over a small area, and not up and down over the whole stroke.

[blackburn mark]

cheers gary,, im going to push on with the revised plan... it solves enough of a problem to take the risk

as far as the temp goes im sure the screws will see a 20 degree shift in a shed in the uk

soooooo...... with the wavy washers plus an easy .5mm in the coupling im kind of confident