NEW picts added - Project conclusion

[QVTom]

I finally had some time to work on one of my projects for a change. The kids and wife are asleep, I'm half asleep but got these upper sears complete   Sometimes you just need to make some time.

I took some pictures to serialize the process. This is my first time using photobucket and linking to picts as imgages.

I hope you enjoy.  Comments welcome of course


Edit: Scan down to my last post to see the new stuff.





S7 Air hardening tool steel.  0.188 wide - Overkill with out a doubt. 


Cut to size and ready for the first operation.



Operation 1 finished - drilled for alignment pins and slotted for the cross pin.



Got to have a fixture for the next op.  Pins will align and tapped holes will hold the part.



Op1 on fixture, ready for op2 - Contouring the profile.



Op2 finished, part still on the fixture.



Finished parts.  Only 1:15 am !


Post complete. 1:50am

[Crosshairs]

Very nice work what gun is that for. If you make them for a 22XX and a 13XX im sure they will sell i for one would buy one.
                                                                     Mike

[Toolmaker]

Really nice work! Thanks for taking the time to take pics and to post it for us to see.

-Matt

[SAADE]

Very nice work what gun is that for. If you make them for a 22XX and a 13XX im sure they will sell i for one would buy one.
                                                                     Mike

+ 1 to Mike's comments, and make some triggers too!

[QVTom]

Very nice work what gun is that for. If you make them for a 22XX and a 13XX im sure they will sell i for one would buy one.
                                                                     Mike

+ 1 to Mike's comments, and make some triggers too!

Thanks for the kind words.

These parts are for a springer of my own design.  I have been working on the design for about 6 months in my spare time and believe it  is now ready to make a prototype.  The sear group seemed like a good place to start, not too difficult and of high importance. 

My goal is to reach 34% efficiency, yielding a 38fpe gun.  I know it sounds like a reach,  however it turns out, I'm sure the pursuit will be rewarding.

As for making sear parts for other guns.  It sounds intriguing but the liability issue has me spooked.  There are many other accessories that don't carry the same price for failure or carelessness that the trigger group does.

-T

[LeadHead]

What machine are you using? Nice pics and love the smell of coolant!

[QVTom]

What machine are you using? Nice pics and love the smell of coolant!

The machine is a Daewoo 3016L VMC.  A very sweet machine with an oil chilled high speed spindle.

-T

[QVTom]

Another productive late night.  This is the lower sear.  The process is similar but different enough to post some more picts.

This part stars with some 1018 steel gear stock


The next step is to make another fixture.  Again pins for alignment, tapped hole and clamps to hold the work.


The gears have been bored and parted on the lathe and are mounted on the fixture. Ready for hole drilling and the rough cut on the profile.


Parts with hold down screws installed and ready to have the clamps removed for the profile finish pass.


Ready to remove from the fixture.



Finished parts.  I scribed  them with numbers so the sets would be easy to identify.


If you got this far you can see how they are going to interact.


If anyone can help me with the pict. rotation I would appreciate it.  It is driving me crazy!!!

Edit: Ignore the above statement.  The picts seem to have corrected themselves!

[path]

you hobb your own gears or sombody else ,nice work.sounds like a big project ,good luck with it.

[rsterne]

Wonderful workmanship.... I wish I had some clue as to how it all works, though.... 

Bob

[Singleshooter]

I have to tell you that I can't wait for this thread to continue.  This really is some good stuff.

Darrin

PS:  Don't sleep so much!  Get back to work...

[QVTom]

you hobb your own gears or sombody else ,nice work.sounds like a big project ,good luck with it.

I have made gears in the past out of necessity using gear cutters but true hobbing is a discipline in itself.   In this case I used stock purchased from Stock Drive Products.

-T

[QVTom]

Wonderful workmanship.... I wish I had some clue as to how it all works, though.... 

Bob

I thought that last picture in the series would give a lot away   As I add parts I'm sure you will figure it out

-T

[bstaley]

Nice!....Dual opposing pistons for recoilless operation?

[QVTom]

Nice!....Dual opposing pistons for recoilless operation?

Boyd, you are correct !

[rsterne]

Dual opposing pistons

Well I kinda figured that from the two sears facing in opposite directions.... I guess I'll just have to wait to see how they are controlled from a single trigger.... 

Bob

[QVTom]

Dual opposing pistons

I guess I'll just have to wait to see how they are controlled from a single trigger.... 

Bob

Couldn't have said it better.  I think of it as a dead reckoning system, make accurate calculations, perform them properly and you should end up at the correct spot.  Of course its always the outside influences that you don't fully comprehend that cause all the problems. 

BTW  - Glad to have you back!

-T

[Rescue912]

38FPE springer?!  I'm in 

Nice work too. I rebuild machine tools for a living but am little more than a hack when it comes to running one.

[QVTom]

Working on the compression tube and the end caps now.

These are the front and rear ends for the compression tube.  The front is threaded and the rear will bolt in with some shoulder screws.  The rear is not complete, it will hold the cocking lever and some linkage so there is a lot to do still.



Compression tube ready to thread the end.  This was a real PITA because the headstock of my lathe will not swallow a diameter this large.  So I threaded it hanging 12" out of the chuck.  It took a while to dial out the run-out and had to thread at 75 rpm to keep the tube from singing too much.  Maybe my next project should be a steady rest



Trimming to length.  Again, hanging way out there.


I'll need an expanding mandrel for the next step.


Mandrel ready


Tube all set up with the indexer, the plug in the left end threads in just the the end cap will and stabilizes the part nicely


Finished compression tube.  I may be the coolest weight reduction job  or the ugliest.  Not sure yet


Tube with front cap installed.

[CO2 Freak]

Cool Stuff there Bud. I love seeing progress pictures from craftsman.
Nice work.