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Thread: How to make a D-type reamer to chamber a barrel

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  1. #10
    Member
    Join Date
    Nov 2014
    Location
    Central Otago
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    2,237
    Quote Originally Posted by akaroa1 View Post
    @gundoc

    Just wondered is you temper after heat treating ?

    I finally had some time and turned up a 32-20 D reamer this afternoon
    Heat treated it
    Took the magnetic table off my surface grinder and sorted out a V block and hold downs
    It should be a nice easy way to grind a perfect D

    Will wait until I know about tempering it or not

    Cheers
    Yes, you must temper after hardening and before grinding. I temper reamers only to light straw colour, still hard enough to cut but some of the brittleness avoided. Care must be taken to avoid heating the steel during grinding (ie; watch carefully and quench often). Tempering after grinding can cause warpage.

 

 

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