Re: die grinder in CNC router

Dave.
Have a think about using a 4" angle grinder. They run about 10000 to 12000 rpm which is adequate for a router bit. For a chuck use a piece of steel shafting bored 1/4" one end with grub screw to lock the router cutter. The other end bored and tapped to suit the threaded shaft of the angle grinder. The accuracy of the cutter and spindle centre is not as important as the repeatability of the cut.

It might not be possible to achieve high accuracy location of the 1/4" hole in relation to the spindle centre line. But I dont think this is a major problem as it may be possible to set up a 2 flute cutter using a dial indicator to align both cutter edges into the same plane if the hole is slightly off centre. Otherwise use a single flute cutter.

Regards
Bob

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Dave Lantz <dlantz@a...> wrote:
> I've allready got a dewalt trim router, but it is just too tall for my
> application, due to the design being upside down (the z-axis assembly has to
> 'tuck' up into the machine)
> here is some more info on what the router would probably do:
> 1/8"-1/4" hardwoods (probably maple mostly), 1/16"-1/8" deep, with small
> bits (1/16"-1/8" typ.) on a small scale router (x:9,y:12,z:1.5), this would
> mostly an "art" router for making wooden boxes, and an occasional brass
> pressing plate (not very deep cut at all--at most .05", and if that became
> a problem, i could simply use the router to etch away resist and then acid
> bath the plate)
>
> speed isn't important, i can go slow if need be
>
> ive got a farely sizable compressor, not sure what H.P., but it pulls nearly
> 20 amps at 115 V
>
> the die cutter ive looked at is: Item #: 35943-2VGA, an ingersall-rand.
> wouldn't this be roughly equivalent to a dremmel tool?
>
> noise could be a problem, but i eventually plan on enclosing the router in a
> sound dampening box, with a shop-vac attachment for dust.
>
> the router has to be portable.
>
> SO, i could use the trim router if i could find a right angle attachment for
> it. I used to have a right angle attachment for my hand drill, but Im
> assuming that wouldn't take lateral load very well... does anyone know of a
> right angle collet i could attach to a trim router?---Dave L.