Pics, my homebuilt Turbo stock

Mr. crb thank you for your suggestions. All the targets above were shot without a rear rest. The front part of the stock is "pinned" to the rest so it cannot move.

In effect for this go-round i have turned a front rest into a 1 piece rest. There is no "riding" of the bags, nothing moves, less vibrations.

The rifle is fired just like you see in this picture, just add a round and pull the trigger. thanks joe:)

TUBETURBO2.jpg
 
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keep pluggin' away!

Joe, I have been reading your stuff with great interest! I respect the fact that you are trying new stuff to learn from it, and that you seem to be having fun!

Could you please try something and report back? Your last post, you said the stock is pinned and cannot move. Could you rig the stock so that you could pin it in any spot along the full length, and test it in different spots front to back?

It will be time consuming, but I suspect you will find a sweet spot where the vibrations are the best for accuracy! This could lead to something!

Thanks, and keep up the good work!
Greg
 
oops!

I just went back and read some of the posts I hadn't looked at in a couple of days! I was redundant. I still think you are right, and that you can tune the rifle with the stock. Only one way to find out!

Go get'em!
Greg
 
You may learn some useful stuff but I don't think what you are doing with the pinned stock is legal. By adding the front glide plate and rear glide rail your stock will be legal for use in competition.

By doing a lot of testing in the current config and then adding the gliding surfaces and doing a lot of testing in a legal config you will be able to compare the results and add to your body of knowledge.

Right now you have a pretty good tuning fork formed by the bbl and the front of the forend. You should put a fired case in the chamber and pull the trigger and see if you can hear any ringing of the tuning fork [ rotate the crimped area of the rim away from the firing pin before each trigger pull ]. Then do the same test while firing live rounds.

You can also try 'ringing the bbl' and listening for any excitation of the tuning fork.

One experiment I would like to eventually try is to put a bead of silicone seal between the bottom of the bbl and the forend to act as a damper. Your layout would make this test very simple. Allow the silicone seal to dry at least 24 hrs and make sure you use a silicone seal that is safe with aluminum. Actually it would be interesting to shoot the gun just after applying the silicone seal and then again later as it sets up.

It maybe that the silicone sealer would need to be placed at a specific spot along the area where the bbl and forend are close. Also, the length of the silicone seal bead may be important and the amount of sealer used may be part of the tuning aspect [ if this idea works at all :) ].

Here is a pic of my AGBR Daystate CRX with a metal stock I made. The rifle shoots the same with this metal stock as it did with the original wood stock which is saying a lot !! I don't know why I worry with the gliding surfaces on an airgun as there is basically no recoil !!! It does make them fit the rests I have :p
CRXraygunforendlhrearFeb09backyard.jpg

CRXraygunlhbuttstockandrestfeb09bac.jpg

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404tbang said:
Joe, I have been reading your stuff with great interest! I respect the fact that you are trying new stuff to learn from it, and that you seem to be having fun!

Could you please try something and report back? Your last post, you said the stock is pinned and cannot move. Could you rig the stock so that you could pin it in any spot along the full length, and test it in different spots front to back?

It will be time consuming, but I suspect you will find a sweet spot where the vibrations are the best for accuracy! This could lead to something!

Thanks, and keep up the good work!
Greg
Click to expand...

Mr. Greg a good idea! the balance point is dead center over the threaded post, sorta like a see saw. Maybe if i get off the balance point it would help kill the vibrations some.

i think i will try moving the front rest towards the trigger, -more to the center the stock. Right now the long overhang to the rear seems to be doing the most vibrating. Maybe if i load the bbl end heavy it won't be able to -seesaw or vibrate so much.

Yea it is fun, i just don't want you guys to think i'm stupid, i have a lot of respect for the members of Benchrest Central. I don't want to be the crazy ol uncle, lol!

I'm planning on doing this today, i should be able to post back results tonite.

Thoughts on outside temperature: We're low 70's in the morning and high 80's evenings in Cleveland Tx rite now. I keep posting the speeds written on the ammo box. So far the Team 1065 is shooting the best, the 10x 1068 did shoot better this morning when it was 75 degrees. at 85 degrees the 10x 1068 didnot shoot at all, i quit after five shots to save my 10x.

i have 2 boxes of 10x 1078 and 2 boxes of 10x 1068, i'm out of the Team, if anyone knows where to get some Team let me know. I have enough 10x to do a speed check comparison in the next day or two. I am out of Ammo and will be calling Mr. Dan monday morning.

Now this is whats in my mind, may or not be fact. **Maybe as the day heats up you might need slower ammo to stay the same speed. I am going by the Team 1065 Vs the 10x 1068, not the same ammo but maybe close. I'll be watching ammo speeds and temp very close for a while and see if i can come up with a correlation between the two. To do it right i wish i had humidity to add in, but for now i don't.

I shot this this morning, the .158 5 shot group is the best of the 4 targets.... with these 4 targets i think this is good enough for now to establish a trend. I'll move the mount and test again, hoping the temp doesn't influence the results and i don't catch it.

It will be interesting to see the results what ever they are! joe :)

turbotarget4.jpg
 
Mr crb you say:
Right now you have a pretty good tuning fork formed by the bbl and the front of the forend. You should put a fired case in the chamber and pull the trigger and see if you can hear any ringing of the tuning fork [ rotate the crimped area of the rim away from the firing pin before each trigger pull ]. Then do the same test while firing live rounds.
Click to expand...

Pretty cool, I can tap the bbl with a metal object and get a nice ringing tone, down to a hum, then quite -listening to the rear of the stock! It is like a tuning fork -don't know exactly what to do with it just yet...

One experiment I would like to eventually try is to put a bead of silicone seal between the bottom of the bbl and the forend to act as a damper. Your layout would make this test very simple. Allow the silicone seal to dry at least 24 hrs and make sure you use a silicone seal that is safe with aluminum. Actually it would be interesting to shoot the gun just after applying the silicone seal and then again later as it sets up.
Click to expand...

I'll try that bead of silicone in the next day or 2 - I gotta get more Ammo. I have plenty Club -for testing but until this morning the Club doesn't group very good for testing purposes.

I have some Wolf but it won't chamber, I got the head space at a minimum -closes fine on the Eley ammo but the rim is just a bit to thick for the wolf.

I like your air rifle set up! i'M GOING TO BE JEALOUS IF YOU HAVE A MILL!! LOL... joe :)
 
G'day

I have been watching this thread with interest because I am thinking of restocking an old Match 54 ( not in the same league as a Turbo I know ), but all that I can afford to play with at the moment.
I am interested in the fact that you are going down the path of pinning the rifle to the rest.
I understand that you are probably trying to eliminate as many variables as possible in the search of what combination works best in your rifle.
My real interest is in seeing if your results by pinning the rifle, are able to be reproduced when the rifle is allowed to move on the rests.My brain says you may end up with a combination that works great when the rifle is pinned ,but maybe works better with a different combination when not ???
I really do think what your doing is great , I wish I had the time and energy to do similar experiments. Until then you are my Guinea Pig.

Thakyou for your time

harro
 
Update 6-01-09

Today i wanted to move my mounting point, maybe offset some of the vibrations. I got to thinking about the thread Mr. Wilbur made about adding quills to a bbl project he was thinking about.

Then i was thinking i had a lot of vibration concentrated at one end of the stock, or it looked like that anyway. Why spread out the vibration then try and dampen it? Maybe if i could kill the that vibration that i had collected up on the end might be the next test.

What i done was cut the end of the stock off and thread it, add a rubber washer and screw it right back on. To my surprise it fit back exactly in line. The guys said i would like the 4 jaw chuck, now i see why.

I did get in a test. Now just one test don't mean anything but at least it was better than before. I have posted all my test targets so if your interested you can make the call.

I shot the club first then the 10x and last was the very last bit of Eley Team i had. It was shooting better, not by much but i guess when your getting close to x's. Positive improvements will be small.

Probably none of these test are scientific enough to conclude anything. The stock is pinned to the rest, there is no recoil, no riding the bags. This set up is not legal for any Rimfire competition.

If the vibration dampner at the rear of the stock improved the target POI, i might conclude the bullet is still in the barrel as it begins to whip around... probably most of you already know this anyway.

Just some stuff i wanted to try that didn't cost nuthing but ammo i was going to shoot anyway. maybe spark a few new ideas who knows..... joe:)

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TURBOTARGET5.jpg
 
Joe,

That set up should be legal for unlimited. Without looking at the rules, I think you should be able to use it for ARA also.

Ken
 
Unlimited for sure

Joe:
You'll fit right in. Here's what I showed up with one time. Come on over to New Braunfels on Saturday June 20th for our Cedar Pointe Night shoot.

Test_Rest_2.jpg
 
Mr. Fred i see i'm not the first "mad scientist"! Where can i find that bungie card looking thingie.. does brownells have 'em, lol!
joe :)
 
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