High speed spindle for Seig X2 ?

[rkovvur]

I came across this really neat way of building a high speed spindle using a ER11 chuck and a HobbyCity brushless motor. Here's the link.

http://www.rcgroups.com/forums/showthread.php?t=1175772


You might skip couple of pages to get to the high speed spindle building.

[knudsen]

Pretty cool! Motors are cheap too: http://www.hobbyking.com/hobbycity/s...3&ParentCat=59 Not any torq I suspect tho

[webgeek]

Actually, the larger brushless motors can get downright scary. There is a whole series of people over at the Endless Sphere forums that use one, two, or three coke-can sized RC brushless motors to make electric bicycles. One that comes to mind can actually do great than 60 MPH - burning rubber the entire way.

I use smaller brushless RC motors for a lot of things in robotics - they need a PWM output but that can be easily created via an Arduino or other simple microcontroller. The speed controllers are surprisingly good for the price. You can use the computer-power-supply-hack to get a great 12v supply that will run even some larger RC motors perfectly.

I'm really glad you posted this as I wanted a high speed spindle and I never even thought of using an RC motor to do it! The real trick seems to be the runout and such... Good stuff!

Mike

[knudsen]

Constant current supply with PWM? Thanks for the tips, I'll look into the controllers you talked about if I get serious on this concept. Might just go with a cheap trim router. Might as well have something that can take off a finger or two

[webgeek]

I see in the thread he is just using a servo tester - something like this:
http://www.hobbypartz.com/esky-servo-tester.html

Then you use a speed controller like this:
http://www.hobbypartz.com/vose80aopbre.html

and a motor like this:
http://www.hobbypartz.com/mo1602brmo.html

and a power supply like this:
http://www.newegg.com/Product/Produc...82E16817190025

I suspect that little motor is quite a bit stronger than the motor that comes on the X2. The biggest issue is that the motor would likely run better at more like 24 volts than 12v which is what that supply I linked will provide.

Mike

[Arich0908]

It seems like a thread like this comes up every few weeks .
I like the idea and think the motors are very efficient and would work great if matched correctly to the mill .
Here is a great link to read this guys sums it up. And a few other Ive saved.
http://www.recumbents.com/WISIL/shumaker/default.htm
http://www.hooked-on-rc-airplanes.co...ic-motors.html

[rkovvur]

well i ordered all the parts for it. The motor, controller and the ER11 chuck and a 1/8" collet. Once I am done making it, i'll report back

[knudsen]

Please, please, please do let us know how it works. I am interested in a high speed spindle. How many RPMs are you shooting for? What type of mill? Once you get it going, could you tell us what parts you ordered?

When I said: Constant current supply with PWM?

I meant: Constant voltage supply with PWM?

Why don't computers do what I mean instead of what I say?

[rkovvur]

I'll try. I have to confess. I dip my hand into too many projects that sometimes i lose track and cannot finish.

The motor is rated 890kv. I am trying to run it at 24v. That gives about 10000rpm.

[knudsen]

Cool. I do the same thing. I need to make a project built using nothing but unfinished projects :-\