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Author Topic: star die threads  (Read 10410 times)

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661MACK

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star die threads
« on: October 07, 2012, 12:53:44 pm »
Can the unthreaded hole where the taper crimp die be threaded to accept star dies?  If so what tap would you use?
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fc60

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Re: star die threads
« Reply #1 on: October 07, 2012, 06:44:01 pm »
Greetings,

Opening up the 3/8" hole is a routine job. There are some things you need to watch for. Below is a method I use.

  • 1) Remove all parts from the tool head.
    2) Mount the tool head on a milling machine and carefully dial in the 3/8" hole true. (The top and bottom flange are ground perpendicular to the tool head axis and can be used as a reference surface.)
    3) Drill the hole undersize and with a boring bar finish the diameter to 0.650" - 0.653". (Only using a drill may not guarantee accurate location.)
    4) Chamfer the hole 0.700" x 45 degrees.
    5) Thread the hole with an 11/16-24 UNEF GH3 tap.
    6) Chamfer the opposite side of the hole to finish the job.

Cheers,

Dave
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