Author Topic: .38/.357 prototype (Read 75062 times)

bruski · « **Reply #240 on:** July 30, 2018, 01:31:30 AM »

Nice torch cutter, I picked up one of those blow torches at an auction last year and tried it out. It was kind of scary to use with gasoline, but it did work ok. Can\'t be to careful with only one hand left and I need it to scratch itches.

bruski

bruski · « **Reply #241 on:** July 30, 2018, 06:28:33 PM »

Cutter,

Do you need any help with heat treating those extractors or have you got the resources covered? I use a induction coil set up for small parts that I picked up on ebay made and shipped from China. It works fast I just thread a small stainless steel wire through it and after it reaches the right temperature, I just drop the parts into a small can of used motor oil under the coil.

bruski

Cutter · « **Reply #242 on:** July 30, 2018, 08:20:37 PM »

Cutter,

Do you need any help with heat treating those extractors or have you got the resources covered? I use a induction coil set up for small parts that I picked up on ebay made and shipped from China. It works fast I just thread a small stainless steel wire through it and after it reaches the right temperature, I just drop the parts into a small can of used motor oil under the coil.

bruski

I have it covered bruski,

Thanks much for the offer

Jerry

Cutter · « **Reply #243 on:** July 31, 2018, 06:02:36 PM »

Hey guys,

The temperature only got up to about 105 today, it felt kinda cool outside to me.

Cutter, your extractors are looking great there holding the cartridges nice and tight to the bolts.

The spring travel problem is cured and I fired a few primed brass through it with good results all the way around. The brass all ejected themselves at about the 9 o- clock position just as they cleared the chamber. Don\'t want to try any live rounds until heat treatment on the bolts is done.

bruski

So bruski, what is your hammer stroke length ?

I just finished a model for my new cam and cocking

mechanism. Hammer stroke = .705

bruski · « **Reply #244 on:** July 31, 2018, 06:48:19 PM »

Cutter,

With the shortened rear bushing and adjusted hammer length I can get .780 out of the bolt now but the stroke is closer to .735.

bruski

bruski · « **Reply #245 on:** August 02, 2018, 02:20:12 AM »

Well I made it to the point of the first assembly on the bolts before heat treatment. The firing pins all seem to work ok and the extractors are ready to install. The other picture shows where the cam followers ended up being which is a good place for them because there is a lot of thickness in that area of the bolt down to just shy of the .191 bore. I am going to use 10-32 x 1/4\" long socket head screws lock tited in place on final assembly.

bruski

Cutter · « **Reply #246 on:** August 02, 2018, 12:13:24 PM »

I decided to make a sample cam from some ABS

pipe I picked up at Home Depot for 11 bucks.

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

Your looking good Bruski !!

Sparky_NY · « **Reply #247 on:** August 02, 2018, 01:54:15 PM »

I decided to make a sample cam from some ABS

pipe I picked up at Home Depot for 11 bucks.

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

Your looking good Bruski !!

How are you holding those halfs of the cam?

Sparky_NY · « **Reply #248 on:** August 02, 2018, 01:54:45 PM »

I decided to make a sample cam from some ABS

pipe I picked up at Home Depot for 11 bucks.

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

Your looking good Bruski !!

How are you holding those halfs of the cam?

Cutter · « **Reply #249 on:** August 02, 2018, 03:27:03 PM »

How are you holding those halfs of the cam?

I have a plate clamped on the bottom with

4 6-32 X 3/4â€™ AHCS

bruski · « **Reply #250 on:** August 02, 2018, 03:47:13 PM »

Cutter,

That is cheating when you use your cnc mill on the cam, it looks great though in the end. I can still remember my first cam machined with a hack saw and files followed by a touch of angle grinder.

In case anybody is wondering how I machined the cam follower heads down to the .250 diameter needed, it is almost impossible to chuck up the short 10-32 x 1/4\" in the lathe without destroying the threads. So why not chuck up a allen head bit in the chuck and use a female center on the threaded end. Works great and turns true.

bruski

bruski · « **Reply #251 on:** August 02, 2018, 03:47:20 PM »

Cutter,

That is cheating when you use your cnc mill on the cam, it looks great though in the end. I can still remember my first cam machined with a hack saw and files followed by a touch of angle grinder.

In case anybody is wondering how I machined the cam follower heads down to the .250 diameter needed, it is almost impossible to chuck up the short 10-32 x 1/4\" in the lathe without destroying the threads. So why not chuck up a allen head bit in the chuck and use a female center on the threaded end. Works great and turns true.

bruski

Sparky_NY · « **Reply #252 on:** August 02, 2018, 04:04:53 PM »

I have a plate clamped on the bottom with

4 6-32 X 3/4â€™ AHCS

I knew about the holes for the recoil plate. Do you make holes in the front cam too, even though they are not needed other than for work holding?

Sparky_NY · « **Reply #253 on:** August 02, 2018, 04:05:24 PM »

I have a plate clamped on the bottom with

4 6-32 X 3/4â€™ AHCS

I knew about the holes for the recoil plate. Do you make holes in the front cam too, even though they are not needed other than for work holding?

Cutter · « **Reply #254 on:** August 02, 2018, 05:32:06 PM »

I knew about the holes for the recoil plate. Do you make holes in the front cam too, even though they are not needed other than for work holding?

Yes Sparky I put the same tooling holes in both pieces

Cutter · « **Reply #255 on:** August 02, 2018, 05:32:36 PM »

Iâ€™m only using the rear cam, front is not needed for

this set up

Cutter · « **Reply #256 on:** August 03, 2018, 06:46:46 PM »

I made the cocking mechanism today from some

white Delrin

Well worth the two days I spent on this, now I can

dial it all in.

Sparky_NY · « **Reply #257 on:** August 03, 2018, 07:06:29 PM »

I made the cocking mechanism today from some

white Delrin

Well worth the two days I spent on this, now I can

dial it all in.

As Bruski would say, thats cheating ! Saves on expensive scrap metal though !

Dave · « **Reply #258 on:** August 03, 2018, 08:58:48 PM »

I made the cocking mechanism today from some

white Delrin

Well worth the two days I spent on this, now I can

dial it all in.

Thats awesome Jerry, that stuff machines like warm butter too!

bruski · « **Reply #259 on:** August 03, 2018, 11:24:07 PM »

Cutter,

Are you going to have a section of the cocking mechanism move able to disengage the firing pins like the RG-G or a fire only? Your Delrin cocking mechanism turned out nice.

bruski

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Author Topic: .38/.357 prototype (Read 75062 times)