Jammer Six
member
Okay, Tuner, Fuff, Wichaka, here we go again.
Practiced on an old thumb safety I had lying around, and now I'm chewing on the one you sent me, 'Fuff. It's the real one, the one I want to keep.
I have it in, and it clicks nice.
New sear, first time fitting this thumb safety.
Smoking it up shows that the angle is good, I think. Nice, even contact across then entire width of the end of the contact surface.
So far, so good.
Hammer doesn't fall, clicks on, clicks off.
The problem is Tuner and his damn dial indicator.
Setting it up in the vise, fully assembled, cocked and unlocked, and setting the dial indicator to the hammer, with a small amount of pressure on the dial indicator, shows the following:
When you depress the grip safety, and engage the thumb safety, the hammer overcocks by about two thousandths.
Messing with the trigger at that point will result in the hammer moving forward, uncocking, by about one thousandth.
Releasing the safety returns the dial indicator to within a thousandth of where it started.
Now...
If it's locked up tight, which seems to be the case, if the safety is wedging itself up against the sear, how can it then allow sear (and therefore hammer) movement, as indicated by the dial indicator?
I was thinking that I'd actually LIKE to see a thousandth (or less) overcocking when the safety was engaged, because then you'd know that the thumb safety was making positive contact with the sear, and that there is absolutely no play between the sear and the safety.
But how can the hammer uncock, if the safety is in positive contact? Is the safety moving?
Enquiring Minds Want To Know!
This would all be so much simpler if I'd never bought the dial indicator, then I'd just run the safety checks, and head for the range...
Practiced on an old thumb safety I had lying around, and now I'm chewing on the one you sent me, 'Fuff. It's the real one, the one I want to keep.
I have it in, and it clicks nice.
New sear, first time fitting this thumb safety.
Smoking it up shows that the angle is good, I think. Nice, even contact across then entire width of the end of the contact surface.
So far, so good.
Hammer doesn't fall, clicks on, clicks off.
The problem is Tuner and his damn dial indicator.
Setting it up in the vise, fully assembled, cocked and unlocked, and setting the dial indicator to the hammer, with a small amount of pressure on the dial indicator, shows the following:
When you depress the grip safety, and engage the thumb safety, the hammer overcocks by about two thousandths.
Messing with the trigger at that point will result in the hammer moving forward, uncocking, by about one thousandth.
Releasing the safety returns the dial indicator to within a thousandth of where it started.
Now...
If it's locked up tight, which seems to be the case, if the safety is wedging itself up against the sear, how can it then allow sear (and therefore hammer) movement, as indicated by the dial indicator?
I was thinking that I'd actually LIKE to see a thousandth (or less) overcocking when the safety was engaged, because then you'd know that the thumb safety was making positive contact with the sear, and that there is absolutely no play between the sear and the safety.
But how can the hammer uncock, if the safety is in positive contact? Is the safety moving?
Enquiring Minds Want To Know!
This would all be so much simpler if I'd never bought the dial indicator, then I'd just run the safety checks, and head for the range...