Canadian Airgun Forum

The #1 Community for Airguns in Canada!
It is currently Wed Nov 20, 2019 3:40 pm

All times are UTC - 5 hours


The Canadian Airgun Forums are a place for people to discuss and learn about airguns and the airgunning sport in Canada. There are lots of discussions about airguns, airgun accessories, reviews, modification and repair information, airgun events, field target and free classifieds!

 

You need to register before you can post: click the register link to proceed. Before you register, please read the forum rules. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload your own pictures, and access many other special features. Registration is fast, simple, and absolutely free! To start viewing messages, select the forum that you want to visit from the selection below.








Post new topic Reply to topic  [ 126 posts ]  Go to page Previous  1 ... 4, 5, 6, 7, 8, 9  Next
Author Message
PostPosted: Mon Jan 25, 2016 11:34 am 
Offline
User avatar

Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8978
Location: Coalmont BC
We smoke our Thanksgiving turkey every year.... and it is AWESOME !!!

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


Top
 Profile  
 
PostPosted: Mon Jan 25, 2016 11:47 am 
Offline
User avatar

Joined: Tue Jun 03, 2008 5:46 pm
Posts: 2815
Location: Canada
Was wondering if anyone would ask :) ...thermometer was reading 58F just less than 15C.

Load, aim, shoot, record...repeat...no pause.

Al


Top
 Profile  
 
PostPosted: Mon Jan 25, 2016 4:18 pm 
Offline
User avatar

Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8978
Location: Coalmont BC
Should have asked :oops:

I caught the load shoot repeat.... lots more there for sure....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


Top
 Profile  
 
PostPosted: Wed Jan 27, 2016 4:15 pm 
Offline
User avatar

Joined: Mon Oct 04, 2010 4:20 pm
Posts: 191
Location: GTA
rsterne wrote:
I pulled apart my 2560 today and swapped it over to the new style one with the internal stop.... Here are the old and new parts....

Image

I am now using a 10-32 machine screw with a piece of 7/32" OD tubing slid onto it for the guide.... Then you slide on the spring and an aluminum collar that hits the end of the gap adjusting bolt when cocking the gun and compresses the spring.... The stop nut is turned from a piece of 5/16" rod, drilled and tapped 10-32 and tightened against the end of the brass tube.... I start out a bit longer than I need and keep shortening the tube until I can get the gun shooting on the plateau with no gap.... Once I get the right length, I install the stop nut with a drop of blue Loctite, tightened against the end of the tube.... The stop nut has a slot in the end for this purpose.... The gap adjusting nut is drilled just over 5/16" because the stop nut has to slide through it.... The end cap is tapped 7/16"-20NF for the adjusting bolt, and then counterbored just over 7/16" to miss the cocking collar.... At the bottom of the photo is the original SSG I made.... You can see how much shorter the new guide is.... Below is the new SSG assembly, ready for installation....

Image

When the gun is uncocked, the stop nut is recessed about 1/2" inside the gap adjusting bolt, so you can't see it.... Compare this with the one above, where the stop nut and bumper O-ring (no longer required) are outside the gap adjusting bolt.... Below is what the gun now looks like when cocked....

Image

This installation is much cleaner, and there is no way you can pinch your fingers like could happen with the old one.... However, you still have a cocking indicator because the stop nut (the part with the slot) is visible when cocked.... With no gap I had about 985 fps, which I could adjust down to whatever I wanted.... At 1-1/2 turns out the velocity was just over 900 fps and the gun was very quiet.... I ended up about 1 turn out, with a average velocity of 960 fps, the same as I had before.... I might have lost a couple of shots compared to the first SSG, but I have still gained about 40% more shots per fill than without the SSG.... and I no longer have to worry about pinching my fingers and I can wrap my thumb over the wrist of the stock again because is it so much more compact.... The efficiency is around 1.40 FPE/CI....

Bob


Well I have reached the end of my "shop's capabilities" (drill press) with the SSG ver 1.0. To build ver 2 will require the purchase of a metal lathe. Wonder how I'm going to squeeze this purchase by the wife ;) new version looks great Bob, but I'm happy with ver 1 for now...

_________________
1377c
2289g
Disco


Top
 Profile  
 
PostPosted: Fri Jan 29, 2016 2:17 pm 
Offline

Joined: Wed Sep 10, 2014 2:42 pm
Posts: 147
Location: Ontario
So...has anyone made an SSG for a .22 disco and can you tell me the following...
spring guide length ( I made mine 3" and I think I need longer)
spring length, OD and wire thickness (tried 2 pieces totaling up to 2.25" length .040" wire .300 OD)
I have only managed to get 730fps with JSB 15.89.
I almost made an order to Trakar springs (near Cambridge Ontario) but they have a $30 minimum order. I started to order six 10" long springs of varying thickness but they wanted $17 + tax to ship so I didn't order.


Top
 Profile  
 
PostPosted: Fri Jan 29, 2016 2:22 pm 
Offline
User avatar

Joined: Sun Jul 15, 2012 10:49 am
Posts: 6029
Location: Victoria, BC and Clarkston, WA
mooseslayerjc wrote:
So...has anyone made an SSG for a .22 disco and can you tell me the following...
spring guide length ( I made mine 3" and I think I need longer)
spring length, OD and wire thickness (tried 2 pieces totaling up to 2.25" length .040" wire .300 OD)
I have only managed to get 730fps with JSB 15.89.
I almost made an order to Trakar springs (near Cambridge Ontario) but they have a $30 minimum order. I started to order six 10" long springs of varying thickness but they wanted $17 + tax to ship so I didn't order.



Same here!
Would really LOVE one for my Joe Hickey Discovery!

_________________
-Rick
Pardini K10
Brocock Concept .22
3 Custom Crosman 2260
Benjamin Discovery .22 w/Joe Hickey stock!
Crosman 150 pistol .22
4 Crosman MK 1 pistol .22
Mrodair CP-1M .22 and .177


Top
 Profile  
 
PostPosted: Fri Jan 29, 2016 2:43 pm 
Offline

Joined: Tue Oct 13, 2009 1:27 am
Posts: 2514
Location: Vancouver
This guy has a number of compression springs. Bought a handful from him a few weeks ago to try in my SSG experiments.
http://stores.ebay.ca/teachyeah/_i.html ... ion+spring
There's lots of other eBay sellers of compression springs, though some will only sell in the UK or whatever local market for some reason. I ordered the 8mm OD version of the 1mm wire diameter 300-305mm length, x10 pieces, so I'll probably have a bunch to pass along after taking care of whatever I'm doing...


Top
 Profile  
 
PostPosted: Fri Jan 29, 2016 3:33 pm 
Offline

Joined: Wed Sep 10, 2014 2:42 pm
Posts: 147
Location: Ontario
I was going to buy some from Trakar in 10" lengths (so when i cut too short I have extra lol) with OD of .250 or .312 , wire size .037, .041, .047 and .055.
Had a hard time finding them under Stock springs because most lengths under 3 inches but in their Spring Length section I saw some good stuff.

http://www.trakar.com/products/compress ... ced=Search


Top
 Profile  
 
PostPosted: Sat Feb 06, 2016 5:45 pm 
Offline
User avatar

Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8978
Location: Coalmont BC
I was curious what I could get for efficiency using the SSG.... so I took my 2260 HPA, which is regulated at 1600 psi, and started dialing back the power and recording the pressure drop for 20 or 30 shots, using 18.1 gr. JSBs.... Here is what I came up with....

Image

This is the first time I have had an efficiency greater than 2.0 FPE/CI.... At just under 12 FPE, I got 2.12 FPE/CI, which is 7.7 barcc/FPE.... That would give me 250 shots per fill on the 13 CI tank.... Adjusted for 23 FPE, the efficiency would be 1.7 FPE/CI and 100 shots per fill.... The way the gun is normally tuned, at 37 FPE, I can actually shoot down to 1400 psi without velocity drop, and I get 60 shots (6 mags.)....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


Top
 Profile  
 
PostPosted: Wed Feb 17, 2016 6:39 pm 
Offline
User avatar

Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8978
Location: Coalmont BC
For some time I have been wondering how effective the SSG would be on a CO2 gun like the Crosman 2260.... I had the opportunity to try that out today.... The testing started out with the gun configured exactly as a stock 2260.... Stock valve, hammer and spring, stock transfer and barrel ports, and a 24" barrel, although the gun did have a Crosman steel breech on it.... I loaded a brand new 12 gr. CO2 cartridge, fired the gun twice to pierce the cartridge, and then shot a string using 18.1 gr. JSB Heavy pellets until the velocity dropped to 300 fps, at which point I stopped.... I fired one shot every 30 seconds, and the temperature was 68*F.... I then repeated the testing using a much lightened hammer that was 50% of the weight of a stock one.... In both cases the stock rear cap was in place, so the preload on the 2260 spring was completely stock.... I then fitted an SSG, using the same spring, with as much preload I could use and still cock the gun with no gap between the end of the guide and the hammer.... I adjusted the gap to 0.020", installed a new cartridge, fired two shots to pierce it, and then fired another string.... The results are shown in the graph below....

Image

There are some interesting things to note.... In stock form, even though I was only shooting every 30 seconds to limit cooling, the velocity declined in a near linear fashion for 30 shots, and then dropped rapidly, with a total of 37 shots above 300 fps.... I calculated the FPE of every shot and added them up, getting a total of 341 FPE from a 12 gr. cartridge.... With the lighter hammer, the initial velocity was lower, but within 15 shots it leveled off, staying within a very narrow ES for another 30 shots before dropping, with a total of 53 shots above 300 fps.... The total FPE from that cartridge was 457 FPE, which is pretty good, and a 34% improvement over stock.... With the light hammer and the SSG, the velocity stabilized quite quickly, and I got over 60 shots before it started to decline.... and the initial decline was not as dramatic.... and I got a total of 78 shots above 30 fps.... over twice as many as stock.... The total FPE from a cartridge with the SSG fitted was 627 FPE, breaking my own previous record of 608 FPE with an 18" barreled 1750.... That represents 84% more energy from a 12 gr. than I got stock....

I am extremely pleased with the huge increase in FPE per 12 gr. CO2 obtained by using the SSG.... This was, additionally, the first attempt using an SSG on a CO2 gun for me, and breaking the 600 FPE mark without tuning was pretty impressive.... I look forward to trying some different settings to see if I can get even more energy from a 12 gr. in the future.... but right off the bat, we know it works great on CO2....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


Top
 Profile  
 
PostPosted: Wed Feb 17, 2016 7:00 pm 
Offline
User avatar

Joined: Tue Jun 03, 2008 5:46 pm
Posts: 2815
Location: Canada
Pretty much mirrors my own results with the 2240....awesome. 8) The SSG concept is sound and now well proven by a mitt full of folks. Can be anything you want/need it to be too....from a dollar store solution to a full out purpose built job.

Just no down side to it...a rarity in this world. :)

Al


Top
 Profile  
 
PostPosted: Wed Feb 17, 2016 7:12 pm 
Offline
User avatar

Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8978
Location: Coalmont BC
Al, I consider that high praise.... and I humbly thank you.... :oops:

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


Top
 Profile  
 
PostPosted: Wed Feb 17, 2016 7:19 pm 
Offline

Joined: Tue Oct 13, 2009 1:27 am
Posts: 2514
Location: Vancouver
Careful now guys, what if it works out like that little gizmo in 'The Jerk' and causes crossed eyes or something? They didn't invent the phrase 'there is no free lunch' for nothing ya know. Okay... I can't think of a down-side to the SSG... WAIT, GOT ONE! It eats through pellets like crazy as we try to perfect the darn thing with chrony test after chrony test! I just burned through another 500 14.35gr JSBs like they grew on trees trying my new 8mm x 1mm springs from China in the 2240. Finally managed to get my shot count back up there, though efficiency is still shy of my best regulated tune efforts - but for now I'm settling on the 1.36fpe/ci as I need a tin for Sunday's FT shoot at Mission. Next time I stock up it's back to testing slightly shorter springs and lots more pellets... So yeah, the SSG is a short term lead wasting habit. There, a down-side to balance things out, and the universe can't complain about a free lunch being had.


Top
 Profile  
 
PostPosted: Wed Feb 17, 2016 7:26 pm 
Offline
User avatar

Joined: Tue Jun 03, 2008 5:46 pm
Posts: 2815
Location: Canada
I keep saying that simple mechanisms work in simple, predictable ways Bob. When you brought this up, it was like a forehead slapper for me...plain as day that it was GOING to work....just had to try it to find out how well. Turns out...pretty darn well. 8)

I should be thanking you...and I do. :)

Yes Gerard....it HAS been the root cause of a good number of smashed pellets. BUT... trigger time is GOOD. 8)

Al


Top
 Profile  
 
PostPosted: Wed Feb 17, 2016 8:15 pm 
Offline
User avatar

Joined: Sat Mar 16, 2013 5:15 am
Posts: 3580
Location: Edmonton
Sterne Force


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 126 posts ]  Go to page Previous  1 ... 4, 5, 6, 7, 8, 9  Next

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 0 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
News News Site map Site map SitemapIndex SitemapIndex RSS Feed RSS Feed Channel list Channel list

Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group

phpBB SEO