Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work.

 
 
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Default How do I straighten Delrin?


"D Murphy" wrote in message
...
"newshound" wrote in news:6h1ti3Fi4clrU1
@mid.individual.net:



Anneal the material either in air or oil.


Too late for that now what he needs is straighten in a jig and hold
it there while annealing...

Cheaper and easier to toss them and do it right.
To each his own.

--


Doesn't that rather depend on who is paying for the material and how he
costs his own time?



Otherwise known as "sunk cost fallacy". So no, if you're a rational
decision maker the amount spent so far should not be considered.

The money you've already spent is lost. You can calculate your cost to
make the parts properly and if you are sure you can come up with a fool
proof way to fix the parts then you can compare the two costs.

Right now fixing the part seems far from certain and has an unknown cost.
It seems likely a repair attempt will just increase your loss. So a do-
over is the best decision.

--

Dan


No, it isn't, the sunk cost doesn't come into it. If you are retired and
don't have much cash, but your time is free then it is worth spending any
amount of time trying to recover it. If you put a small value on your time
then, as you say, you also have to estimate the chance that you can't fix
it. You have to compare the cost of *new* material (not the time/material
already spent) with the time which you might waste on an unsuccessful
recovery.


 
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