Re: [ATM] Trepanning followup

["Chris Dalla Piazza" <dalchri@hotmail.com>]

Some advice I might offer from my recent experience...

I made my wood disk round and well centered by grinding the edge against
sandpaper while spinning it in a drill.  This also refined the desired
diameter.

In my first attempt at the tool, I cut the teeth into the sheet metal before
I bent it around my wood disk and I found that the teeth flared outward and
did not follow the bend of the resulting cylinder.  In my second attempt, I
cut the teeth AFTER the sheet metal was bent around the wood disk and I had
achieved a satisfactory cylinder.  In fact, cutting the teeth might be the
last thing to do.

Something else to consider is bending one end of the metal around the wood
disk.  This will achieve a good round edge flush with the edge of the wood
disk and probably leave the other end of the metal cylinder a little flared.
Then, detach the metal and turn it around so that your good flush end is now
the cutting face and then attach the flared end to the wood disk.

I leveled the bottom of the cutter by bringing it down on sandpaper using a
drill press until the entire bottom, cutting face of the cutter showed fresh
metal.

The last thing I did was to fine tune the flaring of the cutter by bringing
a Sharpie marker lightly against the edge of the metal cylinder while it was
spinning in the drill press.  Any area with marker needed to be bent inward.
Any area lacking marker needed to be bent outward.

Best of luck and remember to renew your grit and clean the groove often!


-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
Norm Prince
Sent: Thursday, January 04, 2007 1:28 AM
To: atm@atmlist.net
Subject: Re: [ATM] Trepanning followup

Far out!
Thanks for the turn out on the ????

ahmen waldo kitty...that's where my brain was going....

so i reckon i'll just fritz with my flashing some...if i curl the flashing
up a scoootch on the edge of the disk...that is to say spiral the edge of
say a two inch swath of flashing up (top edge in relation to plane of disk,
relative to first point of attachment) just a lil as i screw it on i 
minimize
the "poochy" effect....which leads me to a big thanks to Thomas Janstrom,
and Charles Mitchard for their insite...as the resulting tool will in no way
be perfect.

yeah... i think i'm set to try this...wish me luck.

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


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