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PostPosted: Mon Aug 18, 2014 8:41 pm 
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Joined: Wed Nov 27, 2013 12:54 pm
Posts: 518
I wanted to ask the experts their opinion on the type of material they would use for the hammer spring (i.e stainless steel, music wire, etc.)

I ordered a few spring from CENTURY SPRING for a CUSTOM QB unregulated pcp that i have that the hammer spring got crooked has i was experiencing a problem. The gun was working well at 2700 psi but the maker of the rifle suggested that maybe another spring could work at 3000 psi and i tought it was Worth a try.

I orderd a few strenght of sprin. I realised that any spring Under 11 pounds/inch was doing a good job.

But now for my question:

What force/strenght of compression spring would you guys used on your guns.

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Hatsan At44 Tactical .22
Steyr hunting 5 automatic
Ruger air magnum .22
Weirhauch HW100 .22
Gamo Expomatic .177
Benjamin Marauder DougP custom stock
Theoben SlR98 .22
AlEx Custom gun .22 (JezX built masterpiece) :)
Hatsan Atp2


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PostPosted: Mon Aug 18, 2014 11:11 pm 
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Joined: Thu Feb 02, 2006 11:35 pm
Posts: 3099
Location: Alberta Canada
Trakkar has a far better selection of springs than Century. What exactly are you wanting to attain from the gun. As for material constructed from read the amount of deflection that is recieved from a choice of materials.

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PostPosted: Mon Aug 18, 2014 11:29 pm 
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Joined: Sun Jul 15, 2012 10:49 am
Posts: 6029
Location: Victoria, BC and Clarkston, WA
Thanks Kim!
I just ordered a dozen springs from Trakkar to try out!

Never knew they existed!

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-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


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PostPosted: Tue Aug 19, 2014 6:52 am 
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Joined: Wed Nov 27, 2013 12:54 pm
Posts: 518
Thank you Kim for takkar.com

Trying to attain from the gun simply the best balance for shot strings with the valve and hammer spring.
The one installed was doing good with a 32 shots from 2800 to 1300 psi.
Wanted to make it work at 3000 psi to try to use a few more shots.

I can see that music wire seems to be good with deflection and weight support.
Now stainless is also good but less deflection. Wath i realised is that music wire is lot less expensive.
So when mahufacturer uses music wire for the mass production rifles is only for cost effective reasons or is it also for quality and life of the spring.
Wish one will last longer at his original strenght. is there other issues i dont know?
What do we need to look for strenght regarding the power needed to open a stem at a certain pressure.
Is the pound/inches, max deflections, max weight suggested?
Rick i invite you to give your expert opinion as well.

I thought that could be a good topic/tread to start.
I didn t find much informations for newbie about specufication on springs and strenght needed for pcp's.

Alex

_________________
Hatsan At44 Tactical .22
Steyr hunting 5 automatic
Ruger air magnum .22
Weirhauch HW100 .22
Gamo Expomatic .177
Benjamin Marauder DougP custom stock
Theoben SlR98 .22
AlEx Custom gun .22 (JezX built masterpiece) :)
Hatsan Atp2


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PostPosted: Tue Aug 19, 2014 1:01 pm 
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Joined: Sun Jul 15, 2012 10:49 am
Posts: 6029
Location: Victoria, BC and Clarkston, WA
alextermination wrote:
Thank you Kim for takkar.com

Trying to attain from the gun simply the best balance for shot strings with the valve and hammer spring.
The one installed was doing good with a 32 shots from 2800 to 1300 psi.
Wanted to make it work at 3000 psi to try to use a few more shots.

I can see that music wire seems to be good with deflection and weight support.
Now stainless is also good but less deflection. What I realized is that music wire is lot less expensive.
So when manufacturer uses music wire for the mass production rifles is only for cost effective reasons or is it also for quality and life of the spring.
Wish one will last longer at his original strength. is there other issues i don't know?
What do we need to look for strength regarding the power needed to open a stem at a certain pressure.
Is the pound/inches, max deflections, max weight suggested?
Rick i invite you to give your expert opinion as well.

I thought that could be a good topic/tread to start.
I didn't find much information for newbie about specification on springs and strength needed for pcp's.

Alex


Bob Sterne would be the best guy to ask Alex.
I am a mere apprentice when it comes to airgun knowledge. I do trial by error!

_________________
-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


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PostPosted: Tue Aug 19, 2014 10:26 pm 
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Joined: Wed Oct 17, 2007 3:27 am
Posts: 2585
Location: Winnipeg, Canada
Custom unregulated QB. :mrgreen:

I've been using the stock spring against a delrin valve stem in mine, in .22 @ 3K PSI, and all seems to work well.
No where near your 32 shot string count, but nicely balanced for 17 shots or so. Kinda leery of squibbing one in the bore though,
so I usually refill around the 15th shot. I think Eric may still have some delrin stems if you haven't gone this route yet.
Incidentally, from the discussions I've had here and elsewhere, my stock spring seems to be a bit of an anomaly...

Regards,

Doc Sharptail

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