[Lab] ideas for small spindle for small cnc

[Paul (Maker Engineering)]

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).

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).

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.

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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