|
Page 1
|
 |
For the Receiver I started with a 1.5" x .75" think piece of aluminum left over from the SSBAP Pistol. |
 |
|
I started by laying the piece out with Dykem. I used a Height Gauge on a Granite Surface Plate to mark a line .6250 up from the bottom.
|
 |
|
Next it was over to the Mill to cut and square everything up to that mark.
|
 |
|
Then back to the surface plate to continue laying out the rest of the receiver shape and holes for the various pins.
|
 |
|
The next step was to drill those holes using the mill. I start with a simple pointer made from a piece of drill rod to line up the spindle with the center of the hole.
|
 |
|
Next I used a center drill to start the hole.
|
 |
|
Then I drill the hole with a drill bit one size smaller than the final dimension of the hole to be drilled.
|
 |
|
Finally I ream the hole to final dimension.
|
 |
|
I drilled the Hammer, Barrel, and Trigger pin holes first and save the locking pin hole for last. The final step for this hole was to use a .250 end mill and plunge cut to a depth of about .0265 so the screw for the locking pin sits flush when finished.
|
 |
|
Next I used a countersink bit in a homemade handle to clean up the holes a bit.
|
 |
|
Next I mark the center line and reference lines for the depths of the locking pin hole.
|
 |
| I then remount the piece in the Mill and using the pointer I realign the spindle on the opposite side of locking pin hole I drilled before.. |
 |
| Then with a .250" end mill I plunge cut to a depth of .6875, I use a simple homermade detph gauge and periodically check the depth as I am drilling to the reference line a marked before. |
 |
|
Next I used a .3750" end mill and plunge cut to a depth of about .1875"
|
 |
| After remounting the piece and aligning the spindle on the center line pervious marked a .0250" end mill was used to cut a .4375" depth channel for the barrel lug. |