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Thank you for the link.

Could you explain how you imitated case hardening, I really like how that looks.

Don't know how hard of mat'l you're trying to tap but the info I gave above is what I have used for 95% of my tapping needs. Aluminum - D-2 tool steel up to about 40 Rockwell (c scale). After that...

This will get you real close, take the tap size and subtract one pitch.
1/4-20: 1 devided by 20 = .05, .250-.050=.200
Actual drill size =.203 or a #7.
Also works for metric only less math.

I know Mr. Quackenbush pretty well and find that real hard to believe. He is A man of very high morels and have never seen him turn down someone who needed help. Unless of course you bother him on...

How about this!
http://www.bigboreairguns.com/07bisonhunt.htm

Both my Daq's liked higher pressure. Keep adding 100lbs each time you fill till your 1st and 2nd shot are the same velocity. My 45 lives at 3800 psi. two shots within 5 fps. 3rd shot 40 fps slower....

I've never had to thin the web on soft materials but if you hone the cut edges so that you have about . 010-.015" flat at a 90° to the work this gives a neutral rake and will prevent the drill from...

I was just reading up on solder and brazing and the article states that some solders have si added to help them flow.

Donate blood. As your body makes new blood your lead levels will drop.