Screw whip and bending can be mitigated by putting it under some tension, with
angular contact ball or tapered roller bearings at the ends.
On Sunday, February 18, 2018, 10:47:47 AM MST, Chris Albertson
<albertson.ch...@gmail.com> wrote:
If you are bending a screw the speed does not matter it is the
acceleration. That is measured in meters per second squared (or whatever
the Imperial equivalent is? feet per second per second?)
I think a typical low performance mill like most of us have might have go a
2m/s^2 A very high performance one might do 20m/s^2
If the mill can do about 10m/S^2 then the force on the ball screw is equal
to the weight of the table and whatever is bolted down to it. Remember
what Newton said "f=ma".
Which happens first the ball nut breaks or the screw bends is determined by
the length of the screw from motor to nut.
Gene when you used the motor in a design where there was a very large
static load, where the motor had to hold the weight of large vertical
moving head you'd expect poor movement compared to a horizontal axis.
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