On Mon, 04 Apr 2005 14:09:43 -0700, Ken Cutt
wrote:

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
\

Drill collars are extra extra heavy pipe intended to add weight to
the drill string, and add some stiffness so it doesnt wander. Its
also used as something of a safety device in exceptionally high gas
fields. It helps keep the drill string in the ground if you hit a gas
pocket, rather than squirting 10,000 feet of heavy steel pipe out the
top of the derrick and winding it around the country side (not a
pretty sight and will make you both **** and **** your pants while
running like a somebitch away as fast as you can)

A "whipstock" is what is used to direct the drill string off to the
side. Under some homes for example, where you cant drill straight
down.

Or under the neigboring country to steal their oil

Gunner

Rule #35
"That which does not kill you,
has made a huge tactical error"