Re: [CAD_CAM_EDM_DRO] Re: Spindle motors

Right. The Proxxon units are fairly good quality. Anybody with some time
and inclination could probably whip up the bracket themselves.

On 8/29/07, William Perun Sr <wperun1@...> wrote:
>
> Hello everyone, high speed spindles are a real enigma. What I did a
> few years ago is establish a strawman to aim for. After searching I
> found the NSK America, ASTRO-E 250 which runs continuously at 2,000 to
> 25,000 with a maximum output of 105 watts. "Withstands 5,000 hours of
> continuous use", and is air cooled. Yes that is enough to engrave
> steel, brass etc. It is a brushless motor complete spindle, with speed
> controller for over $2,000. NSK makes a complete line of high speed
> spindles, and the ASTRO-E 250 is the cheapest.
>
> There spindles run up to over 50,000 rpm - continuous duty chcle, and
> are machining spindles. The real high speed spindles are water cooled.
>
> Well I did not have $2,000 so I started a search to find a suitable
> alternative. Well after a lot of searching, studying - yes I
> considered RC brushless IRK Outrunner motors, and got no where. I
> asked KDN Tool, http://www.kdntool.com and Ken Cardolino found a
> solution. Take a look at "High Speed Spindle Attachment For The X2
> Mini Mill", on the KDN Tool web site. 5,000 to 20,000 rpm, with built
> in speed control, continuos duty cycle with forced air cooling, 6
> collet sizes, and $110. You can also purchase a mount to mount the
> spindle on to a SIEG X2 stock spindle.
>
> I don't know how much money I spent on books about permanent magnet
> motors, brushless motors, power converters, circuit designs for
> controllers, and hours reading all the stuff. By the way if you look
> hard enough you will find a water cooled, RC, high speed, brushless
> motor, but it's going to cost you $350. Plus the cost of a power
> converter, and speed controller. And you need to design and machine a
> multiple collet system with no runout. Don't forget to ballance the
> whole assembly. And you better have the right kind of bearings in the
> spindle end.
>
> This whole question is interesting because of engraving machines. They
> all use high speed spindles, are not water cooled, are continuous duty,
> and are also used for machining prototype work. The engraving machine
> motors and controllers are also very expensive.
>
> Bill
>
>
>


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