Canadian Airgun Forum

The #1 Community for Airguns in Canada!
It is currently Fri May 24, 2019 10:02 am

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  [ 101 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6, 7  Next
Author Message
PostPosted: Fri Feb 01, 2019 7:15 pm 
Offline

Joined: Wed Jul 01, 2015 2:14 pm
Posts: 301
Location: Manitoba
I would love to have a TX, shame they are so expensive up here, hopefully someday.
I should be closing in on the thousand mark soon, maybe a tin and a half so around 800 if you count the 50 light pellets I shot yesterday.
I agree, if you are doing proper maintenance on your rifle you will get to know it well pretty quick.


Top
 Profile  
 
PostPosted: Fri Feb 01, 2019 9:44 pm 
Offline

Joined: Wed Jul 01, 2015 2:14 pm
Posts: 301
Location: Manitoba
A picture after 50, 6 grain pellets, had some piston bounce so a good test for the bearing, looking good no damage visible. Will update after another 500 rounds or if the bearing fails whichever comes first.


Attachments:
Box and Bearing 010 (800x534).jpg
Box and Bearing 010 (800x534).jpg [ 535.09 KiB | Viewed 387 times ]
Top
 Profile  
 
PostPosted: Tue Feb 05, 2019 7:36 pm 
Offline

Joined: Wed Jul 01, 2015 2:14 pm
Posts: 301
Location: Manitoba
I did a quick accuracy test, 5 shot group , only 12 yards. Used 8.4 grain AA fields, .177. Group measured at 1/8 inch, this is after I cleaned the barrel and took a few shots for the barrel to settle in.
Close to 1 moa so good enough for a springer. I can now see the target in my scope after the shot and see the impact of the pellet, this with the rifle resting loosely on my palm resting on the back of a chair.


Attachments:
Spin zone 10 shots 003 (800x697).jpg
Spin zone 10 shots 003 (800x697).jpg [ 436.25 KiB | Viewed 358 times ]
Spin zone 10 shots 002.JPG
Spin zone 10 shots 002.JPG [ 706.25 KiB | Viewed 358 times ]
Top
 Profile  
 
PostPosted: Wed Feb 06, 2019 3:12 pm 
Offline

Joined: Wed Jan 05, 2011 12:35 pm
Posts: 5836
Location: P.G. B.C.
Very interesting, Robert. Can you shoot longer range for groups?

_________________
Best Wishes
Daryl

Air Force Condor .25
Umarex Gauntlet .22
Air Force Talon .177
HW97 KT .177
HW98 .22
Brocock Concept .22
Artemis PP700S-A Reg. .22
Artemis PP800 Rebel Reg. .22


Top
 Profile  
 
PostPosted: Wed Feb 06, 2019 6:32 pm 
Offline

Joined: Wed Jul 01, 2015 2:14 pm
Posts: 301
Location: Manitoba
Too cold outside to shoot longer range, I would normally shoot 10.5 gain pellets for longer range accuracy but I am out right now. 1050 fps probably not going to be accurate at longer range
This was just a quick test to verify if the rifles accuracy was still there after the mod.


Top
 Profile  
 
PostPosted: Fri Feb 08, 2019 1:09 pm 
Offline
User avatar

Joined: Sun May 20, 2007 10:26 pm
Posts: 290
Location: Any Town ONTARIO
When they fail it is not a gradual decline it is a catastrophic event .Not worth the risk in my opinion . Better off with delrin washers sandwiched with metallic washers .


Top
 Profile  
 
PostPosted: Fri Feb 08, 2019 5:23 pm 
Offline

Joined: Wed Dec 05, 2012 6:52 pm
Posts: 77
...its not so much as to the long lasting qualities of using thrust bearings or not but more one of no point doing it...a pair of delrin washers ...or better still one delrin and the other steel...so theres no galling of same materials...then a touch of lithium and it will match a thrust bearing all day long...with no risk to your precious gun....you will never feel the difference .


Top
 Profile  
 
PostPosted: Sat Feb 09, 2019 8:49 am 
Offline

Joined: Sat Nov 26, 2011 9:35 am
Posts: 95
Location: Eastern Ontario
Just to add some fuel to the fire. :wink:

How do we know that the spring actually rotates upon compression and release?
Look at coil springs in other applications, ie: coil over shocks, automotive suspensions, engine valve springs etc.
On some cylinder heads special valve rotators are used to rotate the valves as the valve springs do not rotate on there own.
If you have a press see if you can get a spring to rotate at all but do it safely.

Grunt


Top
 Profile  
 
PostPosted: Sat Feb 09, 2019 9:05 am 
Offline

Joined: Wed Dec 05, 2012 6:52 pm
Posts: 77
It 100 percent rotates...approx 3/4 of a turn to a full turn...this is easily seen if you mark the spring position with a spot of red paint on the lowest coil and noting the position...
This dont seem like much but it is realised in the guns stability on firing....quite a little shunt of felt torque if no thrust washer


Top
 Profile  
 
PostPosted: Sat Feb 09, 2019 1:52 pm 
Offline

Joined: Wed Dec 05, 2012 6:52 pm
Posts: 77
must also remember that car springs etc are under big load pressures but expansion is not rapid...completely different to airgun springs...
One can clearly see how a badly finished spring end chews up guides...its happening..
Its hard to beat a hardened steel washer for this purpose .


Attachments:
IMG_0084.jpg
IMG_0084.jpg [ 31.95 KiB | Viewed 239 times ]
Top
 Profile  
 
PostPosted: Sat Feb 09, 2019 7:18 pm 
Offline

Joined: Wed Jul 01, 2015 2:14 pm
Posts: 301
Location: Manitoba
Daryl wrote:
Very interesting, Robert. Can you shoot longer range for groups?

I cleaned up a bit and got my indoor range back to 20 yards. I also changed my mainspring from the full power stock spring to a shorter spring I was given from a member on GTA.
The shorter spring drops the velocity from 1050fps down to 850 fps with the 8.4 AA fields. Much better for accuracy. Bearing still in the same shape as last pic, no explosion yet haha.
Here is a five shot group at 20 yards, just over 1/8" ctc. Extra pic of rifle as shot.


Attachments:
IMG_2546 (710x800).jpg
IMG_2546 (710x800).jpg [ 475.17 KiB | Viewed 225 times ]
IMG_2545 (800x680).jpg
IMG_2545 (800x680).jpg [ 543.97 KiB | Viewed 225 times ]
IMG_2544 (800x196).jpg
IMG_2544 (800x196).jpg [ 166.72 KiB | Viewed 225 times ]
Top
 Profile  
 
PostPosted: Sat Feb 09, 2019 9:43 pm 
Offline
User avatar

Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8920
Location: Coalmont BC
I'm glad that, so far, your experiment has been a success.... However, just as it proves that in your experience and application there has not been a failure of the thrust bearing.... so does the previous failures noted indicate that it can happen, with catastrophic results... Neither is 100% proof that a thrust bearing either will.... or will not.... fail....

Personally, I would search for an alternate solution to spring torque that doesn't have a prior history of SOME failures resulting in damage to a springer.... JMO.... Two smooth steel surfaces, with a Teflon washer between them, would seem a logical choice.... YMMV....

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: Sat Feb 09, 2019 10:41 pm 
Offline

Joined: Wed Jul 01, 2015 2:14 pm
Posts: 301
Location: Manitoba
Thanks Bob but what kind of a test would it be if I quit now, if it blows up it blows up, fix it and carry on. No threads with pictures that I have found that show the bearing failures. Very well could have been operator error or not, don't know without pics of failed bearing, and what rifle was it installed in and was the rifle tuned or not before installation. I have a Vortek kit in my rifle, helps keep the spring aligned and prevents it from kinking, I am thinking failed bearings could be from bent mainsprings which is common in springers putting unequal load on the bearing causing it to fail.
A properly tuned springer will not impact the bearing like everyone thinks. Info on that out there too if anyone wants to know more.
I learned this early in my RC car days that a bushing will not do the job as well as bearing. So far so good so I will carry on.


Top
 Profile  
 
PostPosted: Sun Feb 10, 2019 12:37 am 
Offline
User avatar

Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8920
Location: Coalmont BC
As long as you realize you can't prove a negative, then no harm.... You can't prove that thrust bearings won't fail and do damage.... I trust the people that have reported it, they have been around a LONG time, and are very experienced.... so I'm not about to dismiss their findings....

I 100% believe you haven't had a problem.... However, anyone that tries to extrapolate that result may not have the same experience.... Again, JMO....

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: Sun Feb 10, 2019 1:21 am 
Offline

Joined: Wed Jul 01, 2015 2:14 pm
Posts: 301
Location: Manitoba
I agree, I would not expect someone to do this mod unless they know what they are doing, most don't. Who knows what condition the rifle is in and if they do preventative maintenance on their rifle or just wait for it to break.
What surprises me is I am testing with a D350 magnum, have deliberately tried to damage the bearing and so far not a scuff. Time will tell if it works for me long term.
More pics at a thousand rounds if it makes it that far.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 101 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6, 7  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