Author Topic: .38/.357 prototype (Read 75049 times)

Cutter · « **Reply #500 on:** January 05, 2019, 11:39:18 AM »

Starting on the 4â€ schedule 40 brass pipe

for the casing. 7-1/2â€ long.

Sparky_NY · « **Reply #501 on:** January 05, 2019, 11:50:25 AM »

Starting on the 4â€ schedule 40 brass pipe

for the casing. 7-1/2â€ long.

Scary taking a cutter to some of those expensive brass pieces.

bruski · « **Reply #502 on:** January 05, 2019, 01:26:16 PM »

I can see some chatter at that speed.

bruski

Cutter · « **Reply #503 on:** January 05, 2019, 02:16:02 PM »

I can see some chatter at that speed.

bruski

You might be right, itâ€™s hard to control chatter

on this little Jet

Looks fast , but thatâ€™s only 400 rpmâ€™s , worked ok for cutting the length.

Boring could be a problem.

Cutter · « **Reply #504 on:** January 06, 2019, 08:07:39 PM »

I have the boring dialed in at 130 rpmâ€™s .020 diameter cut and .006 chip

There is some chatter, but will polish out OK with some 220 grt

Cutter · « **Reply #505 on:** January 08, 2019, 02:05:10 PM »

The Casing is off the lathe, faced to length and

bored for the cam blanks. Mounting holes next,

along with the clearance holes for the crankshaft.

4171 · « **Reply #506 on:** January 08, 2019, 04:47:53 PM »

Jerry looking good! Did you bore the whole length of the casing?

Mike

Cutter · « **Reply #507 on:** January 08, 2019, 05:22:42 PM »

Jerry looking good! Did you bore the whole length of the casing?

Mike

No Mike,

I bored the first end in 3â€ to 4.050 dia. for bolt carrier clearance.

Flipped it over and bored for the cam

Cutter · « **Reply #508 on:** January 10, 2019, 06:24:00 PM »

The mounting and clearance holes all in, Iâ€™ll try the assembly

after I pick up some screws.

Cutter · « **Reply #509 on:** January 11, 2019, 06:30:40 PM »

Assembly went well, didnâ€™t have to file out any holes.

Como la Ãºltima vez

Cutter · « **Reply #510 on:** January 13, 2019, 02:25:14 PM »

I bored the crankshaft holes in the rear frame piece.

Measures good, but can always be adjusted a little if needed.

Sparky_NY · « **Reply #511 on:** January 19, 2019, 05:30:26 PM »

Crossed a BIG waypoint today with the gun project. Successfully detonated a empty cartridge with a live primer. Last pieces made were the cocking mechanism and switch which are working nicely. I still have to make a knob for the rear, probably tomorrow. Also, its past due time to get a crank handle made up, gears and shaft are done, I turned the barrel cluster by hand for the test fire. Still, detonating a live primer renews the enthusiasm on the project. If a primer detonates, you can bet your last dollar a bullet would have came flying out the barrel too! Its now officially a gun, just needing a lot of finishing touches.

Cutter · « **Reply #512 on:** January 21, 2019, 07:31:15 PM »

I cut the Yoke profile today.

Got a 4.1â€ high yoke from a 7â€ round

Cutter · « **Reply #513 on:** January 26, 2019, 03:57:14 PM »

Cutting a riser for the Yoke today.

I only have 1â€ clearance between Casing & Yoke

Fastening from bottom, and eliminating the center nut

https://www.youtube.com/watch?v=aArmqIkJqtk\' title=\"https://www.youtube.com/watch?v=aArmqIkJqtk\">https://www.youtube.com/watch?v=aArmqIkJqtk

Sparky_NY · « **Reply #514 on:** January 26, 2019, 05:06:50 PM »

Cutter, I am curious how you workheld that yoke piece to get at all the sides. The day is coming for me.

Cutter · « **Reply #515 on:** January 26, 2019, 06:29:57 PM »

Cutter, I am curious how you workheld that yoke piece to get at all the sides. The day is coming for me.

I cut the outside profile first, moved one clamp at a time

outside and cut the inside, make sure all clamp holes are in first.

Good luck

Sparky_NY · « **Reply #516 on:** January 26, 2019, 08:49:26 PM »

Thanks ! Workholding is still a area I am weak on. I have NO problem shamelessly copying your methods though !

Cutter · « **Reply #517 on:** January 27, 2019, 10:18:14 AM »

Thanks ! Workholding is still a area I am weak on. I have NO problem shamelessly copying your methods though !

No shame here,

Iâ€™ve copied other people all my life

4171 · « **Reply #518 on:** January 27, 2019, 11:00:14 AM »

Me too!

Cutter · « **Reply #519 on:** February 02, 2019, 03:51:26 PM »

I cut the radius slot again, to 1/2â€ deep

an added the alignment hole. I getting it set up

on the yoke to make it easier to piddle with.

News:

Author Topic: .38/.357 prototype (Read 75049 times)