Author Topic: Who to contact to make a new hammer spring  (Read 275 times)

Bowhunter73

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Who to contact to make a new hammer spring
« on: August 29, 2021, 05:57:11 AM »
Hey fellas I bought a Jack Haley Jackhammer 45 and the power level is not where should be, I'm thinking someone changed the hammer spring to a liter one or this one has weakened over the years. If I fill it to over 3600psi the fps is low until I get to 3600 my friend Rodney says I should be able to fill and shoot it at 4300-4500psi I have filled to 4000 and it doesn't have enough spring to open the valve. Any help would be very much appreciated. I have tried looking at different spring companies with no luck as the measurement I have don't fit their charts.
Thanks
Terry


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steveoh

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Re: Who to contact to make a new hammer spring
« Reply #1 on: August 29, 2021, 12:49:26 PM »
Hey fellas I bought a Jack Haley Jackhammer 45 and the power level is not where should be, I'm thinking someone changed the hammer spring to a liter one or this one has weakened over the years. If I fill it to over 3600psi the fps is low until I get to 3600 my friend Rodney says I should be able to fill and shoot it at 4300-4500psi I have filled to 4000 and it doesn't have enough spring to open the valve. Any help would be very much appreciated. I have tried looking at different spring companies with no luck as the measurement I have don't fit their charts.
Thanks
Terry

Perhaps John Bowman. Jack’s Son in Law.

I’ll text him and ask.

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Bowhunter73

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Re: Who to contact to make a new hammer spring
« Reply #2 on: August 29, 2021, 01:38:21 PM »
Steve
I really appreciate the help.
Thanks
Terry
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rsterne

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Re: Who to contact to make a new hammer spring
« Reply #3 on: August 29, 2021, 03:19:44 PM »
If you can give me the OD, the wire diameter, the LOA and the number of coils, I will have a look, I have a few sources....

Bob
  • Coalmont, BC

steveoh

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Re: Who to contact to make a new hammer spring
« Reply #4 on: August 29, 2021, 05:26:09 PM »
Steve
I really appreciate the help.
Thanks
Terry

Sent you a PM with John’s number.
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Bowhunter73

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Re: Who to contact to make a new hammer spring
« Reply #5 on: August 29, 2021, 06:18:49 PM »
Steve Thank You and Bob here's the measurements I have 35 coils od .580 id .437 wire diameter .072 but I'd like to have a little heavier wire if possible.
Thanks Terry
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rsterne

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Re: Who to contact to make a new hammer spring
« Reply #6 on: August 29, 2021, 08:08:06 PM »
I need the overall length, please, uncompressed.... Also, are the 35 coils "active", or is there one coil at each end where the coil is "closed" (and cannot compress)?.... If you happen to know the fitted length, and the hammer stroke, those would also be useful.... Is it the outside diameter of the spring that is critical (it fits inside a tube or a hole in the hammer)?.... or is it the inside diameter (it slides on a guide rod)?....

Bob
« Last Edit: August 29, 2021, 08:25:48 PM by rsterne »
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Bowhunter73

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Re: Who to contact to make a new hammer spring
« Reply #7 on: August 30, 2021, 05:55:58 AM »
Bob
The oal is 6 5/8", the ends of the spring are flat, the 35 coils are active and the outside diameter is critical as it fits inside the hammer the inside diameter not as much as there is a little room for the guide rod. I talked to John Bowman last night Thanks to Steve and he's going to look for a spring for me today. I appreciate all the help from you guys.
Thanks
Terry
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rsterne

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Re: Who to contact to make a new hammer spring
« Reply #8 on: August 30, 2021, 08:52:12 AM »
I ran the numbers in a spring calculator, and assuming music wire, got the following:

Spring rate = 8.4 lb/in
Maximum force (coil bound) = 33.3 lbs.
Height at coil bind = 2.66"
Travel available (6.62 - 2.66) = 3.96".... at 8.4 lb.in = 33.3 lbs

Therefore, it would take 16.8 lbs. to compress it 2", It may very well be possible for you to shim the spring, using a piece of tubing, to increase the force.... That will depend on the installed length of the spring, when the gun is cocked.... The first thing I would do is measure that, and let's see what we have got to work with....

Bob
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Bowhunter73

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Re: Who to contact to make a new hammer spring
« Reply #9 on: August 30, 2021, 07:58:52 PM »
Bob
I will try to get that info and get back to you.
Thanks Terry
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Bowhunter73

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Re: Who to contact to make a new hammer spring
« Reply #10 on: September 03, 2021, 08:51:43 AM »
Morning Bob
Finally had time to check the Haley there's a hole behind the trigger that you can look into the action an see the spring when it's cocked it has almost complete spring bind the best measurement I can get for the spring compression while cocked is 3.110". I took some other measurements for John Bowman an they are full length of hammer is 5.085", inside depth of hammer for the spring is 4.089 and the inside diameter of the hammer is .615" hope this helps an makes sense the overall length of the spring not compressed is 65/8" long.
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rsterne

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Re: Who to contact to make a new hammer spring
« Reply #11 on: September 03, 2021, 06:30:39 PM »
If the inside length of the hammer is 4.089" and the spring length when cocked is about 3.11", then there must be some kind of spring seat that goes inside the hole in the hammer when cocked about 1".... The solid length of the spring is 37 x 0.072" = 2.66".... With a free length of 6.63", and a compressed length of 3.11", and a spring rate of 8.4 lbs/in. that gives a force of (6.63 - 3.11) = 3.52" x 8.4 = 29.6 lbs.... That is indeed a bear to cock....  :o

We don't know the hammer stroke, so we don't know the force when uncocked, unfortunately.... I did not find a single spring long enough, but I did find what may be a suitable spring if you stack two of them in line.... Century Spring makes one using 0.081" wire, part # 71818....

https://www.centuryspring.com/catalog/compression-regular?page=product&id=71818CS

OD = 0.60"
ID = 0.438"
Free length = 4.0"
19.4 coils (ends closed and ground)
Rate = 25 lbs/in
Maximum load = 41 lbs.
Suggest Max. Deflection = 1.6"
Coil Bound Length = 1.57"

If you shorten these to 3.25" long each, for a total length of 6.5", you would get the following:

About 32 coils
Rate = 15.4 lbs/in.
Suggested Deflection ~ 2.6" (more is likely OK)
Coil Bound Length ~ 2.6"
Maximum load = 41 lbs.

If may well be that you could use a shorter LOA, maybe 6".... The spring rate would increase, but the uncocked force would decrease.... This would allow you to play with the average and maximum forces.... You could fit a washer in between the cut ends, or better yet, heat the last coil, push them closed, and grind them flat....

I also found a 3" long spring at Trakar Springs, made from 0.080" wire, part # C1524-203-0762

http://www.trakar.com/products/compression-springs/?part=C1524-203-0762&submitpart=1

It has an OD of 0.60", ID of 0.44", length of 3", rate of 29 lbs/in, and a maximum load of 37 lbs at a deflection of 1.78".... Two of them inline would be 6" long, rate of 14.5 lb/in, same maximum load at a deflection of 3.56".... This should fit, and again you could possibly shorten them if this ended up being too much spring.... Since these Trakar springs would not require shortening, you should be able to just drop two of them over the spring guide and try them.... It would increase the maximum cocking force by 25%....

Bob
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Bowhunter73

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Re: Who to contact to make a new hammer spring
« Reply #12 on: September 04, 2021, 06:04:32 AM »
Bob
Thank you for all the help on this project for me, I really do appreciate the time you have spent doing this for me I will let you know how it turns out.
Thanks Again
Terry
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