Homebrew PCBs

Hi Dwayne,
          I added a thin strip to each bearing. I was
hoping one bearing was loose in the body. Looks like
the wear on the commutator is causing the armature
to run out of round. I learned my lesson, speed kills.
The next Dremel will be kept on Number 3.
        A mechanical etching bit is very light. If your tool
is spinning true with a drill bit you are all set. Keep an
eye on the tool as it gets old. The air tools are the way to
go if you can afford it. I will go that route if sales continue
to increase.

                                         John



--- In Homebrew_PCBs@y..., Dwayne Reid <dwayner@p...> wrote:
> At 12:20 AM 4/12/02 +0000, crankorgan wrote:
> >Dwayne,
> >        My Dremel passes that test. My runout shows up
> >above 16,000 rpms. The bits are balanced so one of my
> >bearings must be bad. I changed the collet and got
> >the same results.
> 
> You are probably right.  Another possibility is that the armature 
may have 
> become unbalanced.  That will also show up as increased vibration 
as well 
> as excess run-out.
> 
> The thing I like so much about these little air tools is that the 
rotor is 
> so tiny that balance is less of a problem.
> 
> I've fired up both die grinders and the tip of a #65 carbide drill 
bit does 
> NOT appear to grow larger as the speed increases.  I think they 
will work 
> just fine!
> 
> dwayne
> 
> 
> Dwayne Reid   <dwayner@p...>
> Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
> (780) 489-3199 voice          (780) 487-6397 fax
> 
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