BT 65 valve and poppet questions?

[mann]

I'd try the groove the top first and try to turn it out maybe add some heat also if you can the external ssg used a longer bolt and nuts on the out side then would use hammer adjuster screw to stop the spring slot of people put a oring between then nuts and hammer adjuster bolt then when fired the nuts of the ssg are sitting on the outside of gun  does that make sense

[Racing]

Now excuse me but i have a real hard time understanding why a SSG setup per regular couldn´t be had to work in the BT-65 too?
Hammers center is kind of hollow as is, and indeed that knurled nut at the valve big enough to cater to it.

Why on earth wouldn´t a regular SSG setup work if you just clearance for the bolt head running through the hammer?
That in turn would also render the use of the stock spring stop, just sans effect. Ie; set it to hearts desire as needed for being convenient with the SSG?

That said, plz run this by me cause you lost me...

Then again, the stock anti bounce device would make this rather moot in the first place no? Better maybe to just modify that?

[mann]

Would this work or not

[mann]

Like I said Idk the gun though and my not want that look that extra length could cut off behind the nuts once adjusted properly the bolt on that pic is the spring adjuster for preloading it

[Racing]

Why not, but i guess you´d have to device some manner in to set unsprung length for the unit, and thus control hammer free flight.

[mann]

From what I've read the stock hammer denounce system or set up doesn't work very well kind of sux is what read

[customcutter]

The SSG can be made to work.  I would have to make a longer hammer adjuster so that the bolt in the SSG doesn't stick out the back of it like in this photo.  The other option would be to preload the  SSG by about 1/2" and shorten the bolt so that it doesn't hang out the back.  If the small bolt head sticks out the back of the hammer adjustment bolt then it will "hang" on it when the trigger is released.

[customcutter]

From what I've read the stock hammer denounce system or set up doesn't work very well kind of sux is what read

I know George (the guy in the original video I posted) did 2 or 3 different mods trying to improve the de-bounce system.  He did not do a SSG, it looked like a simple mod. 

[mann]

Ok I got ya  sorry didn't know about that if you make ssg shorter the hammer might have to much free flight Only want 20 to 30 thousandths of a gap but some of it is trial and error   so preload the spring and give it a go

[customcutter]

Yep, as soon as I'm able to get the screw out.  I'll try the shorter bolt first, check the shot string.  If that isn't good, I'll do the longer hammer adjustment bolt.

[customcutter]

Success!  I tried welding a small nut onto the top of the 3mm screw, but way too small of a broken  screw for that method to work.  So, I watched Abom69 last night drill out and remove some 10mm bolts. 

I optically (eyeballed in redneck) the piece to get the screw centered on the mill in the X and Y axis.  Then I used a 1/8 end mill to flatten the top of the screw.  Used a very small center drill to start a hole for the drill so that it wouldn't drift.  Then I used a #40 drill bit to try and drill through the center.  By the time I had drilled all the way through, about .200" it had twisted the screw into the brass piece about .100".  So plenty to grab with a pair of pliers.  All I need now is a 3mm tapered head replacement screw.

[ER00z]

Congrats on fishing out that broke off screw. Seems like the hardware is soft with this brand. Snapped off bolt heads on their springers in the past.

Funny thing, I seem to do a bunch of eyeballing myself. Usually followed by "seems 'bout right". 

[sb327]

I do quite a bit of tlar engineering. Works most of the time and that’s good’nuff for me.

Congrats on getting the bugger out!

Dave

[customcutter]

Thanks guys, going to Lowes after lunch to see if I can find a longer bolt to make a hammer adjustment bolt.  Also need a bolt for the SSG that isn't threaded the entire length and of coarse a 3mm flat head replacement.

I was surprised when Abom eyeballed centering the bolt he removed.  He did explain that he likes to do it with a mill cutter turning the cutting edges 90* to align X and Y.  Then flattens the bolt head for center drilling.  Worked great!

[sb327]

Turning the cutting edges 90 gets you really close. I do that when I start with a punch mark. I use a 1/6” bit, start the hole just barely, then switch 90 degrees on the flutes, dipping the bit in the hole to see which way it moves. Take out the error with the x and y, then it’s centered. Spot drill and then it’s ready to go. Sounds more complicated than it is.

Dave

[customcutter]

Finally got back on the BT65 today.  The first SSG bolt was a 10-24 and threaded the entire length.  It kept catching on the hammer spring adjusting bolt when it traveled through the center hole.  I took a 1/4X20 SS bolt and turned the head down to .250, then I turned the bolt down to .177 (I was shooting for .185, but didn't measure soon enough ).  Then I grabbed a 10-24 die and cut threads on the last 5/8" approx.

I put everything back together and did a few dry test fires.  It's not hanging up like the original 10-24 bolt did on the hammer adjustment bolt.

I'll try and get some shot strings tomorrow and see how adjusting the SSG affects velocities and air efficiency.  It's been raining here all day, so this was a good project.  Here's a pic of the original bolts and the modified bolt.

[customcutter]

Here's a pic of it assembled.

[customcutter]

I shot a few magazines today.  With the hammer spring adjuster in the same place, I was getting a full 100fps less velocity.  I thought it might have been the extra weight of the SSG bolt, so I removed it and basically the same velocities? 

I screwed the hammer adjustment bolt in almost 1/4" to get back to original velocities.  I noticed that with the SSG bolt installed I was getting 1 or 2 shots our of each magazine that were 30-40fps less than the rest of the mag.  So I tapered the back of the SSG bolt and also the hole leading into the hammer adjustment bolt so that nothing could be catching.  I would hoping that it would improve velocities as well.  No luck.   I shot 6 magazines and know less now than when I started.

I'm thinking possibly an o-ring on the transfer port may have gotten damaged during one of the hundred times of dis-assembly/assembly.  I'm going to tear it back down, inspect/replace the o-rings, and put in the full length spring from the Evanix instead of the one that I cut down 2-3 coils, so that it is actually compressed about 1/2".