pyotr filipivich wrote:
I missed the staff meeting but the minutes show Gunner
wrote back on Mon, 04 Apr 2005 06:37:04 GMT
in rec.crafts.metalworking :

On Sun, 03 Apr 2005 19:50:28 -0700, Ken Cutt
wrote:


thank you for responding. I would like to straiten Al "shafts" used in
underwater spear fishing. The impact with the fish often causes the
shaft to bend. I beleive the avenue I wish to follow is annealing. As
far as grades I can not say because they vary. I have always wanted to
build one of these; Maybe designed to accomodate other types of metals
as well. Any suggestions or concerns? thank you. -Davey


Would the equipment they use to re straighten arrows work ? Pretty
common for archery , if so you might ask at a specialty store locally or
search on line . Luck
Ken Cutt

An arrow straightener is nothing more than two v blocks, a lever in
the center to apply force, and a dial indicator.

You can make a decent one in a couple hours start to finish.


A Drill Collar straightener is the same thing, only on a larger scale.

(Drill collars - 31 feet of SS, 4 to 8 inches in diameter, used by
drilling outfits for something. I just made 'em.)


tschus
pyotr

Collars were used to hold the drill bit from wandering so they can hit a
targeted location . Been a long time for me but I doubt it has changed .
Darned things were some heavy I remember that .
Ken Cutt