[Lab] ideas for small spindle for small cnc

[Paul (Maker Engineering)]

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
>
> --
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