Re: not stiff enough!

Richard,

While reading Joe V's reponse I realised someting EASY you could try!

Better support of the ENDS of the shafts! Like we do with ballscrews.
So as not to repeat too much here, check the archive on ballscrew
mounting, and look at the difference between simple, fixed, and rigid
mounting. The problem being solved there is the same one you have
here! The difference is that your shafts aren't spinning...

To sum up, it appears(in the picture) you have what would be called a
simple mount (single point of contact, relatively "thin" point of
contact) on the ends of the shafts. You could "thicken up" the end
mounts (like a fixed style ballscrew mount) with addtional layers of
mdf, or you could use longer?!?! YES! longer shafts and mount the
ends in TWO ,SPACED holes. This double support will cause the support
to be 'cantilever-ed out' into the unsupported area of the shafting,
improving machine stiffness.

Hope this helps.

Ballendo

P.S. Even the simple mount can be improved by a SOLID connection to
the minimal area available. (Means fix the ends in epoxy, or at least
VERY tight holes)

>Rich,
>Take lighter cuts. Your machine looks much better than alot of
>the "kits" available right now. I think you're just<snip>
>Joe V

>Richard Spelling wrote:
>I built this cncrouter<snip>
>The problem I'm having is that it's not very stiff. I realized there
>would be some flex in the unsupported shafting when I built it, but
>I didn't realize it would be as bad as it is.