there are a couple of sellers on ebay who offer a wide range of new taps -
it may be worth your while to look there and see what you can get - I
typically found I paid about a dollar per tap







wrote in message
...
Hey Robin,

Thanks for taking the time to write that detailed post. I've got a
new sense of confidence now and I might try the hand drill tapping
machine with your advice.
mcmaster lists the following spiral point taps. I'm guessing 2 flutes
is more ideal than 3 (more room for chips to leave). I'm guessing
cheap $4.68 one will do fine unless someone tells me these coatings
are worth twice the price?

Tap Material Surface Coating/Treatment Thread Length Overall"
#Flutes Each
High-Speed Steel Uncoated (Bright Finish) 1-1/8" 2-23/32" 2
2523A412 $4.68
High-Speed Steel TiN (Titanium Nitride)-Coated 1-1/8" 2-23/32" 2
2762A48 $6.41
High-Speed Steel TiCN (Titanium Carbonitride) 1-1/8" 2-23/32" 3
2568A43 $9.75
High-Speed Steel Oxide-Over-Nitride-Treated 1-1/8" 2-23/32" 3
8300A19 $7.83
Cobalt Steel Uncoated (Bright Finish) 1-1/8" 2-23/32" 2
8779A31 $10.65



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