Motor Coupling - Was: unbalanced load

--- In CAD_CAM_EDM_DRO@y..., cadcamcenter@y... wrote:

> Also, if one scrimmed on flexible coupler, and use a solid coupler
> instead, will this also lead to accelerated demise of the motor?
>

Peter

>

I've place a file in the files section called Rigid coupling.jpg
and the following text file :-

Though I'd share this with the list.
Shot shows a large commercial coupling broken by repeated reversal
under load.
The two others, one complete, one in 3 parts shoes the replacement I
made to replace these. Scale can be got by the size of the matchbox
and the dowel pins being 8mm [ O.315" ]
The original coupling is off a large laser cutter's X axis. Powered
by large servo's with 1700 oz/in force and with the laser being a non
contact machining process the speeds can be as high as 480in/min.
Most of the damage is done cutting smallish circles where it has to
reverse very fast on the interpolation.
What was needed was something nearly rigid but with no free play. I
made the first one up and tried it and it worked fine. On seeing this
the manufacturers changed to a solid one piece nylon coupling but
these just sheared the keyways and grub screws. We came to an
arangement and they now fit this type shown.

John Stevenson