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.