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Custom tap

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Chuck in E. TN:
 [font=]I am making a custom 1/4" x 40tpi tap for a friend. He had the change gears for his lathe disappear during a move.
 I have the threads cut, and a 5 deg taper on the end. I'm getting ready to mill flutes and the square end for the tap wrench. Can I cut the flutes with a regular 1/8 end mill? I don't have a ball end that small. How deep should they be? He'll be cutting threads in cast iron. I have to also make a matching screw, so I will be taping a piece of hex steel stock for a test nut.
 I have printed out an article on making custom taps with just a filed obelisk (think Washington Monument) shape for the tapered start and no flutes, but I think flutes would be better.
 
 Chuck[/font]

tom osselton:
So why a 1/4 x40?

Chuck in E. TN:
It's what the plans call for. The plans are for a model airplane engine, running diesel. The plans are from a guy in PA.  MLV something. Can't remember his name.
Anyway, got the tap made and heat treated, a nut made with the tap, and am now working on the screw to match the nut. I think it's for metering fuel.
Chuck

mklotz:
For $15.60, I'd just buy it...

http://www.use-enco.com/CGI/INSRIT?PMAKA=891-4928&PMPXNO=3904763&PARTPG=INLMK32

Chuck in E. TN:
Where's the fun in that, Marv?
I went ahead and made the tap, cutting the flutes with a 1/8" end mill. I hardened it, but did not temper it. I made a nut from some 1/2" steel hex I had in the junque box and cut it's thread with the just made tap.
I had to go slow with lots of cutting fluid, but it worked!
Chuck

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