[Lab] ideas for small spindle for small cnc

[Darcy Whyte]

I suspect that standard drill chuck is much too large to mount small
endmills like 1/64 or 1/32 and turn them at 20,000 rpm. There has to be
something more the size of a dremel chuck out there. Ideally I think direct
drive is the way to go and a belt if I can only find a chuck with a shaft.



On Wed, Feb 9, 2011 at 8:48 PM, Paul (Maker Engineering) <
paul at makerengineering.com> wrote:

> Oh and not sure about that one in particular but most drill press chucks
> are friction fit. (very slightly tapered hole and you pound it on)
> On 2011-02-09 8:31 PM, "Richard Guy Briggs" <rgb at tricolour.net> wrote:
> > On Wed, Feb 09, 2011 at 07:38:42PM -0500, Paul (Maker Engineering) wrote:
> >> Something like this:
> >>
> http://www.canadiantire.ca/AST/browse/6/Tools/PowerToolAccessories/Chucks/PRD~0545561P/Mastercraft%252B3%25252B8-in.%252BChuck%252BWith%252BKey.jsp?locale=en
> >>
> >> <
> http://www.canadiantire.ca/AST/browse/6/Tools/PowerToolAccessories/Chucks/PRD~0545561P/Mastercraft%252B3%25252B8-in.%252BChuck%252BWith%252BKey.jsp?locale=en
> >probably
> >> designed to fit on a standard shaft (like 8mm, or 6mm rod cut to length,
> >> maybe turned down a bit).
> >
> > How does it attach to the shaft?
> >
> >> Mount a pulley on that, to drive it by belt
> >>
> >> Then drive it with one of these:
> >> http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8480
> >>
> >> <
> http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8480
> >Capable
> >> of 40,000 RPM at 12V, and at max power (which you would have a hard time
> >> sourcing the amps for), it can put out half a horsepower (in it's
> optimal
> >> power band).
> >
> > Holy crap! that's barely larger than a cubic inch!
> >
> >> Power the motor with something like one of these guys:
> >> http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=9299
> >>
> >> <
> http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=9299
> >with
> >> a small fan on it (or hell mount a fan on the shaft of the motor before
> the
> >> pulley and use the backwash to cool the motor and the ESC). Feed it
> direct
> >> 12V from your PSU, and feed it a pwm servo signal to accurately control
> >> speed of the spindle.
> >
> > A PC AT or ATX power supply modded should be easily able to supply that.
> >
> >> Simple, effective, and affordable. :)
> >>
> >> - Paul
> >>
> >> On Wed, Feb 9, 2011 at 6:51 PM, Darcy Whyte <darcy at siteware.com> wrote:
> >>
> >> >
> >> > Great idea.
> >> >
> >> > I could run the spindle chuck from a belt or I could try and find a
> chuck
> >> > that could mount on the shaft. Nothing shows up in ebay but I don't
> know
> >> > what to search for. I'll keep fishing around...
> >> >
> >> > Darcy
> >> >
> >> >
> >> > On Wed, Feb 9, 2011 at 6:21 PM, Paul (Maker Engineering) <
> >> > paul at makerengineering.com> wrote:
> >> >
> >> >> I would say get a shaft that fits a stock chuck (drill press chuck
> for
> >> >> example)
> >> >>
> >> >> Mount a pulley drive on it, and drive it from an RC Brushless DC
> Motor,
> >> >> with an RC Speed controller. You can send it simple servo signals
> (pwm) to
> >> >> control the speed accurately and easily, and the whole thing would be
> quite
> >> >> high torque, and fairly cheap. And no fancy electronics to power the
> motor,
> >> >> just feed it raw 12VDC from your main PSU.
> >> >>
> >> >> - Paul
> >> >>
> >> >> On Wed, Feb 9, 2011 at 6:15 PM, Darcy Whyte <darcy at siteware.com>
> wrote:
> >> >>
> >> >>> Hi,
> >> >>>
> >> >>> I want to make a couple small CNC mills for fun. I decided the
> Mantis is
> >> >>> too small so I am doing other designs. I want to use it for cutting
> balsa
> >> >>> wood and the other for more general purpose.
> >> >>>
> >> >>> I am looking for ideas for the spindle for cutting balsa wood. I
> think if
> >> >>> it had an 1/8th chuck so I could use my 1/64th end mill that would
> be cool.
> >> >>>
> >> >>> Any ideas what to use for the spindle??
> >> >>>
> >> >>>
> >> >>>
> >> >>>
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> >> >>>
> >> >>
> >> >
> >
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> >
> > slainte mhath, RGB
> >
> > --
> > Richard Guy Briggs -- ~\ -- ~\ <hpv.tricolour.net>
> > <www.TriColour.net> -- \___ o \@ @ Ride yer bike!
> > Ottawa, ON, CANADA -- Lo_>__M__\\/\%__\\/\%
> > Vote! -- <greenparty.ca
> >_____GTVS6#790__(*)__(*)________(*)(*)_________________
>
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