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PostPosted: Thu Jan 11, 2018 12:30 pm 
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Joined: Fri Dec 14, 2007 3:10 pm
Posts: 793
Location: Central BC
Looking for a weaker hammer spring for my Brocock Concept since deciding it’s a keeper. Where do you guys source springs from normally? I can certainly check suppliers in the UK, bought thought maybe there was a Canadian source for springs? I could maybe cut the spring down slightly, but I’ve never tried my hand at spring chopping, not sure I really want to go down that road. I’m just looking to decrease the power to the point it can be a quieter indoor shooter over winter.
Thanks for any info.

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PostPosted: Thu Jan 11, 2018 12:36 pm 
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Joined: Mon Mar 09, 2009 6:46 pm
Posts: 1395
Location: r Alberta
I have found some at an industrial supply store here. take your spring for comparison.
I also bought a mixed box of springs from Princess Auto they arn't the best quality but they work for some things.


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PostPosted: Thu Jan 11, 2018 3:19 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
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Location: Coalmont BC
Trakar Spring in Ontario.... online catalogue with all the specs.... http://www.trakar.com/products/compression-springs/

I suggest you put in the specs of your current spring, with a small range of length and diameter either side, and wire sizes smaller than but up to your spring.... then go over the list it generates to make your decision....

Bob

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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!


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PostPosted: Thu Jan 11, 2018 4:04 pm 
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Joined: Fri Dec 14, 2007 3:10 pm
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Location: Central BC
rsterne wrote:
Trakar Spring in Ontario.... online catalogue with all the specs.... http://www.trakar.com/products/compression-springs/

I suggest you put in the specs of your current spring, with a small range of length and diameter either side, and wire sizes smaller than but up to your spring.... then go over the list it generates to make your decision....

Bob


Thanks Bob, I will check the site out as suggested. I feel silly, I do not even know how to properly measure the specs for a spring.. I suppose I have some research to do.

_________________
Highlights - Evanix Conquest
FAS6004, HW44, Alfa Proj
Air Arms S200, Air Arms S510, HW50s, Weihrauch Barakuda
Walther Lever Action, FWB 300s, FWB 601
Other goodies!


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PostPosted: Thu Jan 11, 2018 5:10 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8936
Location: Coalmont BC
The important numbers are OD, wire diameter, and overall length.... The number of coils also will affect the spring rate.... If you know the spring rate for your existing spring, you will find it a lot easier to get a weaker one (lower rate)....

The spring rate is usually in lbs/inch.... A 12 lb/in spring will take 12 lbs. to compress it 1 inch.... or 6 lbs. to compress it 0.5".... This means that you can measure spring rate fairly easily.... I use a piece of angle iron in vice, with a hole drilled through it and a rod passing through that hole.... The top of the rod is threaded for a nut, and the bottom of the rod forms a hook you can hang a weight on.... You remove the nut and slide your spring onto the rod, followed by a flat washer and the nut.... When you hang a weight on the hook, the spring will compress.... You can even use a nail with a hole drilled in the end and a string holding a weight tied to that hole, like this....

Image

With no weight on the hook, measure the height of the spring between the angle iron and washer, using calipers.... Put the weight on the hook, and measure again.... The DIFFERENCE in the measurements, in inches, is what you need, and how heavy the weight it.... You calculate the spring rate by dividing the weight in lbs. by the distance in inches the spring compresses when you add that weight.... EG....

Weight = 5 lbs.... Distance spring compresses = 0.375".....

5 lbs. / 0.375 in. = 13.3 lb/in....

HTHs....

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!


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PostPosted: Fri Jan 12, 2018 12:31 am 
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Joined: Fri Dec 14, 2007 3:10 pm
Posts: 793
Location: Central BC
rsterne wrote:
The important numbers are OD, wire diameter, and overall length.... The number of coils also will affect the spring rate.... If you know the spring rate for your existing spring, you will find it a lot easier to get a weaker one (lower rate)....

The spring rate is usually in lbs/inch.... A 12 lb/in spring will take 12 lbs. to compress it 1 inch.... or 6 lbs. to compress it 0.5".... This means that you can measure spring rate fairly easily.... I use a piece of angle iron in vice, with a hole drilled through it and a rod passing through that hole.... The top of the rod is threaded for a nut, and the bottom of the rod forms a hook you can hang a weight on.... You remove the nut and slide your spring onto the rod, followed by a flat washer and the nut.... When you hang a weight on the hook, the spring will compress.... You can even use a nail with a hole drilled in the end and a string holding a weight tied to that hole, like this....

Image

With no weight on the hook, measure the height of the spring between the angle iron and washer, using calipers.... Put the weight on the hook, and measure again.... The DIFFERENCE in the measurements, in inches, is what you need, and how heavy the weight it.... You calculate the spring rate by dividing the weight in lbs. by the distance in inches the spring compresses when you add that weight.... EG....

Weight = 5 lbs.... Distance spring compresses = 0.375".....

5 lbs. / 0.375 in. = 13.3 lb/in....

HTHs....

Bob


That was incredibly helpful. Thank you for taking the time to provide all that information, very much appreciated Bob.

_________________
Highlights - Evanix Conquest
FAS6004, HW44, Alfa Proj
Air Arms S200, Air Arms S510, HW50s, Weihrauch Barakuda
Walther Lever Action, FWB 300s, FWB 601
Other goodies!


Top
 Profile  
 
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