MadDog is off on his Honeymoon and won't be back for a while so building is semi-suspended until he gets back. I'v spent a bit of time going over the internals
and making them work a bit smoother and polishing them up.
My compressor arrived so I was able to put together a new ROF video, this is with 120psi from a 50ltr compressor - the pressure dropped to just below 110psi at
the end of this video:
ohhh yeah :D still too slow. Going to double up the return springs, so I'm hoping to (at best) double the ROF. If you noted the stutter in the video; it's
because at the moment we're just use a simple press-open valve for the trigger and it's rather hard to hold open, even with your thumb :P
[a few days later...] Did a bit more work on it:
Cleaned up the two dog plates and tappet plate (not shown) and enhanced the profile of the valve dog-plate (top one) so that it had a larger impact area
Took the barrel bearings out and gave them a wash with WD-40 as they'd picked up a bit of dirt and were leaving track marks
Welded on a spring-return mount:
Sadly as I was welding it drifted to the right a little - mainly because I'd used some wood in the G-clamp to hold it in place (which promptly caught fire :P)
Springs on the spring-return mount:
Enhanced the sides of the tappet plate so they had a more positive connection with the valve dog-plate, before we were just using screws to move the
plate as a result the plate was starting to show signs of damage. Also touched up a weld.
Welded on the 2nd spring-return mount to the tappet plate:
Installed the 2nd set of springs we'd got from that automotive shop
Need to make those springs come a bit more to the left.
The recoil coming off it now is a lot better, must be getting close now... new video coming soon :)
[some tinkering later]
I've drastically reworked the dog-plate, I cut out two copies of it and then got all 3 plates and screwed them together. The idea was to increase the surface area on the roller and make it easier to actuate the valve - glad to say this has had the desired effect :) It's also improve the reliability a lot more too. I've also replaced the dog-plate engagement knocker from earlier. Tapped holes down the bottom of the tappet plate so that the ROF can be adjusted by altering it's position (the pic is from the underneath of the gun):
This is firing 'full stroke' with the new return springs....200 oddish RPM? Maybe a bit more
This is on 'short stroke' where the dog plate is engaged a lot earlier on. As you can see it's not so heavy in the recoil... I like the heavier slower recoil more :P
MadDog is back from his honeymoon! So back to normal :)
