NEW picts added - Project conclusion

[Motorhead]

What more to be said than ..... O'my
Tom, some mighty fine engineering going on here, Love it love it love it !!!

[Hanabata808]

I'm so totally amazed with the progress on this build!

[rsterne]

I am SOOOOOOOOO jealous.... I stumble along with my Atlas lathe with a milling attachment and I can't even believe it's possible to achieve what you do.... Simply AMAZING !!!

Bob

[Stefan]

lovely work! I am just amazed!

[QVTom]

Thanks all.  I have good and bad news to report, no picts but maybe I'll get some up later.

The good news is that the cocking bar with the pawl system functions flawlessly.  When the lever is pulled back, the rear piston catches the sear as designed and the pawl for the front piston pops in place with an authoritative click   When the handle is pushed forward the front sear catches, then with a slight release of pressure on the handle the front pawl retracts and the handle can be stowed completely .  I never imagined that this part of the design would function so positively the first go around.

Now for the bad news....  The cocking effort was way more that calculated and expected.  I knew  the sliding link was going to be a high friction spot due to it's high point load but never thought it could be SO BAD.  I took a major short cut and it bit me big time. Shame on me.  Luckily I just have a bruised ego considering other types of things that can go wrong with guns.

The cocking system does work but I fear it won't last long with the stresses at play.  I had an alternative linkage design that eliminated the sliding  link, I decided against using because added more parts. (the short cut).  Time to integrate that design into the existing parts.

So a minor set back.

Tom

[Motorhead]

As we so frequently say ...... Unless ya got pictures it did not happen 

All kidding aside Tom,  Hope you get it sorted out sooner than later, we are all waiting and watching 

[sperho]

Did you fire it?

[QVTom]

As we so frequently say ...... Unless ya got pictures it did not happen 

All kidding aside Tom,  Hope you get it sorted out sooner than later, we are all waiting and watching 

Not enough pictures for ya?  I thought by now I would/should have some credibility after 7 pages of pictures  

Did you fire it?

Nope.  I haven't mounted the barrel yet or finished the bolt.  I did finish the bolt handle though.

Tom

[lloyd-ss]

Tom,
Too bad about the sliding link, but I know you will get the other linkage up and running.  Considering the complexity of this project, I would have expected a lot more uh-ohs. LOL
The sear engagement sounds like a major success.  Did you have a chance to try the sear "release" yet.
This project might be called "The Air Gun Chronicles of QV Tom."

[QVTom]

Tom,

This project might be called "The Air Gun Chronicles of QV Tom."

Funny, the makings of a good reality show.  Parts thrown, words bleeped, tools breaking, arguments with staff, designer lost in forums looking for solace.

Tom,
The sear engagement sounds like a major success.  Did you have a chance to try the sear "release" yet.

Not yet. Must get the energy in the system reliably first, then let it out 


I'm sure there will be more oops and oh-ohs to come.  Actually it's already happened!

I got the new links installed, quite the learning curve.  In an attempt not to have to make too many new parts I settled on a reduced ratio for the cocking lever.  I had 120 degrees of travel and now I have 80.  Mistake!!!  A 33% reduction in leverage is just too hard, although the new linkage does operate smoothly.  Tomorrow I will de-gass my springs and charge them to 1200 PSI,  this will give about a 33% reduction in force allowing me to continue  with testing of the release and transfer port.  If all goes well I then will redesign the linkages to get back to the 120 degrees of travel , beef up some of the parts that seem undersized,  and charge the springs back to 2500 psi.

Tom

[QVTom]

I've been very busy with work lately so I have not had much time to ponder on the linkage issues. I finally found some time to develop some concepts I had discounted earlier in the development.  I think I have found a system where the geometry is not to offensive and the ratio is exactly where I originally designed.




I didn't say it was simple, feeling compelled to please Lloyd, it had to be at the bloody edge of manufacturability.

[Motorhead]

Nuttin showing up Tom

[QVTom]

Strange, looks fine on my screen.  Using Chrome.

Tom

[Motorhead]

Strange, looks fine on my screen.  Using Chrome.

Tom

Firefox here and no image or video links to view

See an edit time stamp 10:10 still NADA

[QVTom]

Changed posting to Youtube.

[Motorhead]

Yea, small font link to an automated CAD drawing ?

Is that correct ?

[QVTom]

Should be a video (actually animation)

[Motorhead]

Should be a video

Is a 12 second Photobucket animated CAD drawing showing a cocking arm I guess pivoting on what looks like roller chain links moving some other parts.

EDIT ... Cool got a viewable link now.

Yea, the complexity of this rifle is something else !!
Waiting to see pics of the REAL DEAL when your ready to share 

[QVTom]

Yep, didn't think you were going to see actual parts in action?  Vaporware LOL.  I'm going to build after the Fun shoot, too much going on this week.

Tom

[strever]

Tom
same here as Scott
blank on original post
and able to see the animation on your link