Re: Semi-good high speed spindle idea?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, juan gelt <juangelt@y...> wrote:
>
> http://www.angelfire.com/az2/proff/PaulJonesPCBSpindle.html
>
> i never tried this but i like all the ideas.
>
> small tooling is different than big, as rotational
> diameters approach closer to zero. for tiny cutters
> you do not need a lot of torque, but to get any
> reasonable amount of material removed in any
> reasonable time you do need speed.
> what the owner of a big mill tells you may or may not
> apply at all to the tiny scale. a grasshopper can leap
> 100 times his length, but an elephant can't even hop.
>
> it looks to me not unreasonable to use a taig lathe to
> make a homemade 50k rpm spindle because your spindle
> mass will be exponentially smaller for tiny cutters.
> the r/c motor on a tiny spindle looks good to me.
>
> note that heating and preloading issues appear to be
> absent by design (by the drawing i saw) in this
> because the thrust bearings aren't at opposite ends of
> a rod that heats and contracts.
> (taig and sherline take note: problem of excess
> bearing load due to heat is absent by design. paul did
> it; you can too)
>
> skinnier spindles are more flexible? sure. but it's
> the .004 cutter that is gonna be what gives long
> before any side loading bends your spindle.
>
> [disclaimer- no financial interest, etc...it just
> looks like a well studied solution to me.]
>
> --- Codesuidae <codesuidae@c...> wrote:
>
> > a57chevytruckguy wrote:
> >
> > >I found
> > >a spindle at sureline but they want $380.00 + s&h
> > any ideas for a
> > >cheaper spindle.
> > >
> > >ps I am wanting a straight spindle around 10,000
> > rpm
> > >
> > >
> > Maybe a Taig spindle? They run at 10krpm but I
> > think they're priced a
> > little better. Taig recently released an ER spindle
> > so you might even
> > find a used one in the older style for cheaper if
> > you can tolerate the
> > collets.
> >
> > I really wouldn't expect to find too much suitable
> > for a high speed
> > spindle cheaper than these though. Hand tools can
> > be found that run
> > fast, but they're generally designed for big, strong
> > bits where some
> > runout won't be noticed. The kind of precision
> > required for running
> > delicate bits at high speed just isn't cheap.
> >
> > If you try anything unusual, be sure to post about
> > it with your results.
> >
> > Dave K
> >
> >
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