Re: [CAD_CAM_EDM_DRO] Re: cheap HF trim router vs Dremel

Hi, well Dremmel cant be all that bad, worked mine thru 10 years of jewelry
biz, polishing, drilling beads,cutting frozen bearings off, running them at
160 volts dc to get more speed, we lost 4 over a 10 year period.
one of my last ones i still have since we closed the shop in 1982!!!!! if
you take em apart once in a while and stuff new brushes and bearings they
last pretty good. they just are not a 25,000 rpm motor with 3 horsepower
period.....also not running them wide open without a good load will kill
them. a variac will take a bit of speed off and make the life better. Also
for those of us who have worked a Bosto-matic with a majic 70,000 +rpm
spindle know even those expensive spindles need rebuilding quite often.
Fact of Life-after you stuff it into a solid piece in rapid instead of
feedrate
chances are you just goofed the spindle....cul brian f.

----- Original Message -----
From: "cncdxf" <cncdxf@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, February 07, 2002 10:43 AM
Subject: [CAD_CAM_EDM_DRO] Re: cheap HF trim router vs Dremel


> Hi,
> I am curious which Dremel Model only lasted three hours. Or
> did you mean Dremel Style. I have a Dremel Multipro with over
> 200 hours on it!
>
> Bob
>
>
>
>
> --- In CAD_CAM_EDM_DRO@y..., Vincent Chan <v7chan@a...> wrote:
> > Hi,
> > I've also have been using my CNC to machine PCB boards. It's
> been quite
> > the learning process.
> >
> > Initially, I've was using a Dremel. Lasted about a month, with the
> motor
> > eventually burning out after about 3hours of more or less straight
> machining.
> >
> > I then picked up a Makita trim router (model 37000, 7.2V cordless)
> at my
> > local tool store, for $39 cdn. (about $26 US) It came without the
> > battery, so I cut off the battery holder and hooked up an 9VDC 3amp
> power
> > source to it. It runs pretty hot, so I drilled a series of holes
> into the
> > plastic casing. The motor seems to run just "warm" now. Its been
> about a
> > year now, with no problems.
> >
> > The real trick is to get the right type of bits and run them at a
> high RPM.
> > Regular carbide endmills (I tried ones down to 1/16" dia.) will
> wear out
> > before the board is finished. The electronics industries uses some
> > specilized carbide bits, both as drills and mills. You can usually
> find
> > these at surplus stores, recognizable by the little colourful
> plastic disk
> > that they have on their shafts. They work very well.
> >
> > hope this helps,
> > Vincent.
>
>
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