Re: re: New file uploaded to CAD_CAM_EDM_DRO

Smoke,

I realised you didn't FORGET when I read your earlier response.(just
AFTER I had posted mine) However...

Relying on the other end mount is something you don't usually want to
do.(even though, I myself described this earlier in this thread with
two plain radial bearings in SIMPLE mounts) With short screws or
light loads, it can be OK, but as a general practice for machine
tools' leadscrews... NO.

I realise you have much experience in production machinery and design
so I know you can point out cases where it IS done. So Can I :-)

The gotcha's are that any expansion(or contraction) of the shaft or
machine mounting surfaces(in relation to each other,or independantly)
will affect the "end-play" of the leadscrew shaft.

Careful engineering and precision machining can make this approach
work well in specific instances, but it should not be considered a
general solution, IMO.

From your earlier post, I gather that this is a dual row bearing. In
this case, you have drawn a VERY sturdy SIMPLE mount! The very
meaning of "fixed" is to "fix into position" WITHIN the single mount.


Ballendo

>No, I didn't forget. As I posted in an earlier reply...I'm assuming
>the opposide end of the shaft is fixed. If the same or similar
>mount is used on both ends of the shaft, the shaft would be trapped
>between both sets of bearings and would not be able to move
>lengthwise.
>Smoke