Re: 10,000 RPM spindle speed on a BP

If your serious, this is what I would do, for heavy duty high speed
milling.
Look on E-bay for a Pershke or something similar router spindle
these can easily turn 18,000 all day long for years.
I seen one that came off an edge bander, a while back, for low bucks.
Less than ($200). Of course these are high frequency heads and you
would need a VFD (inverter) to run it at 300 Hz for 18,000 rpm.
We have a Porter Pin Router in our shop that runs at 20,000 rpm's
that I rebuilt in 1985. Has not had the bearings replaced yet.
It uses an Oil mist system made by Bijur (fantastic unit) we use
ATF in it. Used about a quart of oil in the last 5 years and
we run this thing almost every day. One job we had routing, Basswood,
was 110,000 pieces 15 hours a day, 5 hours per operator.

my .02 worth
-John






--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Polaraligned"
<polaraligned@...> wrote:

>
> Why not? One of the biggest disadvantages of a BP is the lousy 4000
> RPM spindle speed. Certainly you can't do this with a varispeed head
> without loosing the varidiscs. If you are using a Vector based VFD you
> can use a modern motor and just eliminate the varidisc nightmare
> assembly. One would need to come up with some easy to change gearing
> that can send the speed up to the 10,000 range. I wonder if the
> spindle would need a quality high speed balancing job?
> Something to think about if you do a lot of aluminum or other soft
> material. Every VMC that I looked at had a spindle speed that went up
> to at least 15,000 rpm.
> Probably want to start out with a 2hp, 3450 rpm motor,have the ability
> to drive the spindle directly with a 3:1 ratio and get 10,000+ rpm's.
> Reverse the 3:1 ratio (reducing speed) and get all your lower speeds.
> (in conbination with the Hi/Lo setting.)
> Take a look at this picture of a setup done by Paul Babin of Babin
> Machinery.
>
>

http://img.photobucket.com/albums/v223/polaraligned/BP%20drive/BPwithoutvaridiscs.jpg

>
> A set of 2 stacked pulleys to reverse the ratio would work fine.
> Just one belt change and you are off into milling territory once only
> a VMC could handle.
>
> Of course, this is best used on your CNC mill and not your manual mill.
>
> Is this nuts?
> Any thoughts?
>
> Scott
>