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Bad hammer or not? Spec question...

Discussion in 'Gunsmithing and Repairs' started by JeffC, Jul 17, 2006.

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  1. JeffC

    JeffC Member

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    Kuhnhausen notes that the hammer pin holes should be .1575" +.0020" and for comparison the hammer pin should spec .157" - .002"

    So the hammer I have in question mikes .161 on one side and between .162" & .1625" on the other... For comparison this one's hammer pin measures .155"

    I voiced this concern with the manufacturer, and asked for a new hammer & sear as one corner of the sear looked prematurely worn since only one hammer hook was bearing on the sear. When the pistol was returned to me it had a new sear but they did not replace the hammer.


    Opinions?
     
  2. Jim K

    Jim K Member

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    That sounds like a pretty sloppy hammer pin fit, so I am not too surprised that there are other problems. FWIW, a hammer bearing on only one side of the sear is fairly common on factory guns; they will sometimes wear in.

    Actually, this seldom is even noticed, so just out of curiosity, how did you find this problem, or do you mike every part of a gun to see if it is in spec?

    Jim
     
  3. JeffC

    JeffC Member

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    I first noticed the hammer was a leaner, then noticed I could press it upright a few degrees, then I miked it and noticed both holes were larger than spec, and one moreso and egged... I put the factory parts in the spare parts bin and after needing to send the pistol back for a few other things I stuck the factory ignition pieces back on. I expected they would replace the hammer but they only replaced the sear.

    The trigger pull did suck out of the box, another reason I took the factory parts off in the first place.

    And I am a mikeaholic, Jim :evil:
     
  4. Clipper

    Clipper Member

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    Old machinist's trick...

    ...When a dowel pin hole would get opened too far and you weren't about to spend a lot of time with the fix. Lay the hammer on a sturdy flat surface, and set a ball bearing 2-3 times the diameter of the hole in the oversize hole, and strike sharply with a hammer. The rim of the hole will extrude in and down slightly. Now, either redrill, or preferably ream the hole.
     
  5. JeffC

    JeffC Member

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    Hey, that's an idea... but my luck I'd crush the hammer :scrutiny:
     
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