[ATM] Trepanning...you know for kids!

[Norm Prince]

Hurray...it worked.

I know this is old hat to you cats.

Anyway... i done chopped me out a circle of glass...(that's how us southerners talk <wink>)

I posted some of the saga at
http://mysite.verizon.net/cmb15s7x/trepan.htm

As far as the blank goes...I didn't really have much trouble with the chipping and such as the tool cut thru that many folks spoke of.  Only one small area showed any evidence of this problem...no big deal.  I might ad that i did not rotate the work 180 degrees as suggested because i was worried about getting it centered over the tool properly (relative to the original center).

I did wind up cutting a bit of a taper into it tho.  The taper is non-exsistent on one side and pronounced on the other...it puckers out, on what i see as the back of the blank, about 1/16" at its worst.  Tho all in all the back side of the blank is roughly speaking 1/16" wider on the whole as the front...the front of the disk only varies in diameter by about 1/32"...

So how did i do?  Yall think i can make a decent mirror out of this, or should i start over?

I'm sure to have some more questions...lol...probably about centerless grinding first and formost...in order to shape this thing up a lil more before i start making a mirror out of it.

-norm-
Georgia, USA (land of bad seeing)