Re: Semi-good high speed spindle idea? - Thanks and an explanation.

My two pennyworth... I posted this to the hombrew pcbs group a few
days ago..

The proxxon hand tool collet chuck, ABEC 9 skate bearings, 8mm drill
rod, an 8mm die to suit the proxxon thread, a few scaps of metal and
you are away....

the proxxon collet chuck is the best of the miniature collet chucks..
the Skate bearings are by far the best bearings for the cash...

I am now at the stage where I am buying a decent new DC motor just to
run the spindle inside a spindle design...

I don't have pictures of the setup but a picture of the chuck is
mentioned below...

the rest below is lifted from the homebrew pcb list


Chris


I like the proxxon collet so much that I use it on my CNC'd Seig micro
mill.
I bought the Chuck nut and a set of collets for just a few pounds and
made a shaft to fit it.
The only tricky bit was making the reamer needed for the internal taper.

I have uploaded a picture in the Spiyda folder of the photos section
showing the proxxon collet chuck being used to run a 3mm carbide
endmill to cut steel. In this instance it is only running at 2000 rpm
and is mounted on a stub shaft in the seig 6mm collet, but I have had
a spindle built with 8mm drill rod on ABEC 9 skate bearings up to
35,000 rpm.

http://ph.groups.yahoo.com/group/Homebrew_PCBs/photos/view/2fb5?b=10

I did originally try the dremmel collet chuck but each time the tool
was fitted, the runout was different by up to a couple of thou.
I am now trying to work out how to fit a proxxon chuck to my old
faithful minicraft drill !

Chris (-=Spiyda==-)

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "vrsculptor" <vrsculptor@h...>
wrote:

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Will" <nmbmxer@y...> wrote:
> >
> > Would it be possible to run a highspeed spindle through the existing
> > spindle? Say for instance disassemble a dremel type flexshaft or make
> > something similar and mount the bearings in an adapter in the spindle
> > socket and have the motor mounted above a hollow drawbar? Kind of
> hard
> > to describle without a sketch...
>
> William,
> I thought about that and even bought a high power flex shaft dremel
> from Ebay that would fit in a 1" collet. I went to mount it and found
> that the quik switch 300 adapter on the mill is not through drilled. It
> doesn't use a drawbar. It uses a quarter turn twist lock. I hadn't
> given it much thought since then. I wonder if I could drill out the
> spindle with a carbide bit chucked on the table. The blockage is only
> about an inch thick. The rest of the spindle is open.
>
> Roger
>