[Lab] ideas for small spindle for small cnc
Richard Guy Briggs
rgb at tricolour.net
Wed Feb 9 20:31:41 EST 2011
On Wed, Feb 09, 2011 at 07:38:42PM -0500, Paul (Maker Engineering) wrote:
> Something like this:
> 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:
> 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:
> 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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slainte mhath, RGB
Richard Guy Briggs -- ~\ -- ~\ <hpv.tricolour.net>
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