Re: [CAD_CAM_EDM_DRO] not stiff enough!

Rich,
Take lighter cuts. Your machine looks much better than alot of the "kits" available right now. I think you're just taking too
heavy of a cut. You can also experiment with cutters. Different cutters will produce significantly greater side loading than
others.
I guess you should be specific about how much flex is too much. You are machining wood right?

Richard Spelling wrote:

> I built this cncrouter:
> http://www.spellingbusiness.com/robot.jpg
>
> X is 1 1/4" shafts, 60".
> Y is 1" shafts, ~40"
> Z is 1/2" shafts, 18"
>
> 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.
>
> I have 3/4" for Z, which would take care of some of the stiffness problem,
> but I can grab the top of the top of Z and move it by hand and the 1" shafts
> will flex visibly.
>
> My current back to the drawing board effort focuses around theses items:
>
> 1) use the 3/4" shafting for Z
> 2) move the Y shafts further appart to reduce leverage
> 3) possibly rotate Y shafts 90 degress to bring the "top" one to the same
> level as the bottom one
> 4) use the 1 1/4" shafting for Y
> 5) use the 1" shafting for X, drill and tap holes for support posts
>
> and maybe
> 6) use open bearings an ALL shafts, attach "angle iron" steel supports and
> cross bracing.
>
> comments and suggestions requested!
>
> Richard Spelling, http://www.spellingbusiness.com/boats
> >From the muddy waters of Oklahoma
>
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