Opening Receiver Sight Apertures

[JWinAZ]

Apertures of 0.050” are no longer useable for me. On a bright day I can use 0.075”. I have several that can be opened up. This required a multiple step plan to do. First, I needed a way to hold and drive the tap. The .216-40 tap has a very short male taper that would not work with my tap followers. I started with a small tap chuck with ¼” drive, then made a holder for the chuck. This will be something I can use in the bench mill too.



Next, I made a fixture to hold the aperture by drilling and tapping a short piece of 12L14.



Very easy to thread the aperture in and drill to the desired size, in this case a number 49 (0.073”) drill. Now to the range.

 

[oscarflytyer]

I like the A-Dapter to screw the sight into! Might check too. I have a few of the .090" discs that are stock. And haven't checked Skinner peep thread size, but can get nearly .090" with is inserts, and his open peep stem is .090" iirc.

 

[Slughammer]

Thanks for sharing. I've never noticed a tap chuck before this. I think I could also use one of these on my bench mill. I'd probably want to make a really short 1/4" drive tool with a hex so I wouldn't have to raise the head/lower the head between drilling and tapping. I could drive the hex with a ratcheting wrench.

 

[JWinAZ]

@Slughammer Exactly so on the plan to use it for the bench mill. On Amazon: LABEAR 1/4"DR M3~M8 Interchangeable Tap Chuck, Adjustable Tap Socket, tap socket

Very nice quality and reasonable price. I used collet block to cut the square drive, worked well. I might go for the 3/8 drive for larger taps. I like having the hand feed for work that a broken tap would be bad on!