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LC Smith Project Gun Starting From Scratch

This is a discussion on LC Smith Project Gun Starting From Scratch within the High-End and Specialty Shotguns forums, part of the Shotgun Forum Discussions category; Hey all Here in picture #1 is the carrier stud hole drilled into the back of the rotary bolt. The picture is shot from the ...

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Old 07-30-2020, 05:36 AM   #31
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LC Smith Project--Modified Tooling for Drilling the Carrier Stud Hole

Hey all
Here in picture #1 is the carrier stud hole drilled into the back of the rotary bolt. The picture is shot from the relative downward angle following the hole. The carrier stem Picture #2 is a stepped stud consisting of a small turned forward section .125 (1/8) diameter by .156 (5/64) long, followed by another section .1875 (3/16) by .250 (1/4) long. The back of the carrier is a yoke slotted through for the top lever and mounted with a pivot screw so the carrier is free to move up and down a bit as it is swung through its arc by the top lever. Picture #3 is the carrier stem stepped hole viewed from the slotted side of the rotary bolt. The hole is angled into the off side of the slot with something less than about half of the hole diameter exposed. Because the hole is started on an angled surface, I think it best to drill it with a center drill, the best tool for this kind of cut. The very top section of the hole can be plunged with a 1/8 end mill first if starting on the angled side becomes problematic. The correct angle will be determined by calculation. The drill must pass through a "ghost point" .375 (3/8) above the bolt on dead center (this represents the the hinge point of the carrier) and then drilled into the bolt at .1250 (1/8) off center through the .250 (1/4) carrier stud relief counter bore. A #4 center drill should give us the correct diameter and length of hole to clear the first turned section of the carrier stud, but behind that size the center drill will need to be cylindrically ground to .1875 (3/16) to put in the second .1875 (3/16) diameter.

Okay we are planned and laid out about as well as we can be for our next few cuts, so we can proceed with finishing the bolt. First we will plunge the clearance counter bore, then calculate the angle, and drill the hole into the back side of the bolt through it. Then we will have the trigger plate welded up and dress it out, and then fit the plate to the receiver to gain our bottom bearing point for the top lever. At this point, finally, we can assemble the original locking assembly and test the fit all around with our new rotary bolt, trouble shoot any issues, and get it working exactly like the original.
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LC Smith Project Gun Starting From Scratch-dsc03471.jpg   LC Smith Project Gun Starting From Scratch-dsc03470.jpg   LC Smith Project Gun Starting From Scratch-dsc03336-1-.jpg  

Last edited by 4575wcf; 07-31-2020 at 12:15 AM.
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