Homebrew PCBs

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@...>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

Celebrating 18 years of Engineering Innovation (1984 - 2002)
  .-.   .-.   .-.   .-.   .-.   .-.   .-.   .-.   .-.   .-
     `-'   `-'   `-'   `-'   `-'   `-'   `-'   `-'   `-'
Do NOT send unsolicited commercial email to this email address.
This message neither grants consent to receive unsolicited
commercial email nor is intended to solicit commercial email.