tapping holes: still dumb at it!

Crayola

Crayola

Joined
Sep 23, 1999
Messages
3,831
Hello all! Long time no post.

Soon I want to try using screws to put handles on a knife. I have threaded stuff before, so I'm not absolutely new. But I do need some help.

my knife blade stock will probably be 1/8", and I might use some 3/16" next. What size of screws will I need? What drill bit/tap? Any advice on tapping?

P.S., on one project I'll be fastening titanium and another material over the titanium to a tang. Do I need to tap all of the pieces, or just the tang?

Thanks guys!
 
A buddy of mine asked me easy ways to quench 440-C. After pullihng it out of the oven, is room temp. air enough of a quench? Or maybe compressed air? Any help for my pal?

Thanks!
 
Do a search for recent posts by Chiro75 about tapping ,it's all there.....Do you use antioxident/anti decarb coating on the steel or do you use stainless foil envelopes ? Still air will work but it might be better to use moving air - set up some kind of fan.
 
Crayola said:
Hello all! Long time no post.
my knife blade stock will probably be 1/8", and I might use some 3/16" next. What size of screws will I need? What drill bit/tap? Any advice on tapping?
Click to expand...

I dont know if this is really what you needed as far as tap drill to tap sizes :confused: . hope it helps :D :D

Tap drill chart
 
Cray,
General rule of thumb is at least 3 threads in the material. The second number (ie 1x72) means 72 threads per inch, 36 per half inch, etc.
 
I would probably go with #4-40 screws to attach scales, they're not big enough to be an eyesore but will be good and strong and easier to tap than the little guys. #2-56 is the smallest I would use to attach handle material but your going to need more of them cause their pretty thin.

As far as stacking peices, only tap the peice you want to attach them too. If you tap every single peice the threads won't match up quite right and they won't lay flat.
If you want, you can camp them up real good and drill your pilot hole through all of them at once so they line up. Then tap the tang, and go back and ream all the other holes to just a hair bigger than the thread diameter of your screws.
 
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