Re: [CAD_CAM_EDM_DRO] Re: Semi-good high speed spindle idea?

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@...> 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
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES:
> http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe:
> CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe:
> CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com,
> wanliker@..., timg@...
> Moderator: pentam@... indigo_red@...
> davemucha@... [Moderators]
> URL to this group:
> http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru
> Google.com to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I
> consider this to be a sister site to the CCED group,
> as many of the same members are there, for OT
> subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC
> DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT
> ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
> Yahoo! Groups Links
>
>
> CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
>
>
>
>
>
>

__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com