[Lab] ideas for small spindle for small cnc

[Richard Guy Briggs]

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??
> >>>
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> Lab mailing list
> >>> Lab at artengine.ca
> >>> http://artengine.ca/mailman/listinfo/lab
> >>>
> >>>
> >>
> >

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	slainte mhath, RGB

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