Thread checking

[mklotz]

Thread-forming taps have several advantages over ordinary taps.

They create no chips so there's nothing to clog up and break the tap while tapping.

Since they form no chips they don't require flutes in the tap body; thus the tap body is stronger and better able to resist breakage.

Formed threads are stronger than cut threads because there are fewer stress risers.


My favorite calculator (I have two of them) is the HP 35s...

http://www.amazon.com/HP-F2215AA-ABA...eywords=hp+35s

The major advantage for me is that it is programmable. I can keep it loaded with oft-used computations as well as quickly constructing on-the-run calculations that will be repeated for a particular job. It can operate in algebraic or RPN (Reverse Polish Notation) mode. I use the latter exclusively because of many years experience with assembly language but the former is there for folks who don't get it. Runs forever on two 3 volt coin batteries.

I also have, but don't really use, a full-scientific calculator I bought for 99 cents at the local dollar store. I bought it to prove to a colleague just how cheaply calculators can be had.