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Air Gun Home Forum Index » General Air Gun Questions and Topics » Every springer owner can use one of these...
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Every springer owner can use one of these... 
PostPosted: Fri Jan 11, 2008 11:00 am Reply with quote
Westonhill
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Tim Johnston's Mainspring Compressor He's making it for sale at $60 + S&H.
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PostPosted: Fri Jan 11, 2008 11:30 am Reply with quote
broommaster2000
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You can also make them yourself, or ask a handy friend to make one for you...

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PostPosted: Fri Jan 11, 2008 3:14 pm Reply with quote
Alstone
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I personally think that any spring compressor that relies on an angle bracket of that length, to hold a spring in compression is very bad design. All spring compressors should be supported on at least two sides if possible, also the length of the base, which looks like a piece of shelf bracket needs to be bolted down to a length of wood to stop it flexing. And as for a bit of Velcro to hold the receiver in place makes the whole unit a bit iffy.

If he wants to make it for himself that’s alright, but if I was him I wouldn’t sell them.

Al

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PostPosted: Fri Jan 11, 2008 3:40 pm Reply with quote
22magnum
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I am somewhat surpised others need such robust spring compressors..I took my Phantom 500 apart and these was almost zero sping preload.
Are other guns pre-loaded much more? That must be hard on the spring
to be under compression all the time..I would think its best to have much pre-loading of the spring (just enough to prevent twanging)
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PostPosted: Fri Jan 11, 2008 4:05 pm Reply with quote
AirGunEric
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Interesting. I would agree with Alstone- Velcro holding things down doesn't inspire alot of confidence. As for guns needing a spring compressor- some really do have an huge amount of spring preload, especially some that have been modified. Many guns also don't need a compressor due to very little pre-load. I suspect this spring compressor would work well in an application involving little preload and for someone who doesn't have a helper or an 8' hand span to do it alone.

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PostPosted: Fri Jan 11, 2008 6:37 pm Reply with quote
broommaster2000
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22magnum wrote:
I am somewhat surpised others need such robust spring compressors..I took my Phantom 500 apart and these was almost zero sping preload.
Are other guns pre-loaded much more? That must be hard on the spring
to be under compression all the time..I would think its best to have much pre-loading of the spring (just enough to prevent twanging)


In most powerfull springers you'll find that the spring is bend a bit. Some bad quality springers also get that, even when they are under none to no preload.

However, most springs in tuning-kits, in combination with spring-guides seem to last a lot longer, and sometimes lessen the pre-load.

There are kits that insert a smaller spring, but that increase the power output of the gun. For instance, a HW97K of which I had the honour of shooting a couple of times.

Twang can partly be caused by a spring that is preloaded and bend.

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I have one. 
PostPosted: Fri Jan 11, 2008 6:50 pm Reply with quote
Westonhill
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broommaster2000 wrote:
You can also make them yourself, or ask a handy friend to make one for you...

I have the B-Square Mainspring Compressor. I was thinking for the time and all the tools I needed, I might as well just go buy it, which cost me as much as a Chicom rifle :-)
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PostPosted: Fri Jan 11, 2008 7:04 pm Reply with quote
Westonhill
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AirGunEric wrote:
... As for guns needing a spring compressor- some really do have an huge amount of spring preload, especially some that have been modified. Many guns also don't need a compressor due to very little pre-load. I suspect this spring compressor would work well in an application involving little preload and for someone who doesn't have a helper or an 8' hand span to do it alone.

My Tx is far more powerful than my R7. Yet, the Tx doesn't have much preload while the R7 has a lot. The spring on the R7 is not hard to compress by hand, but like what you said, if you are the only one who's working on the gun, a spring compressor helps tremendously.
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PostPosted: Fri Jan 11, 2008 7:54 pm Reply with quote
broommaster2000
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Westonhill wrote:
AirGunEric wrote:
... As for guns needing a spring compressor- some really do have an huge amount of spring preload, especially some that have been modified. Many guns also don't need a compressor due to very little pre-load. I suspect this spring compressor would work well in an application involving little preload and for someone who doesn't have a helper or an 8' hand span to do it alone.

My Tx is far more powerful than my R7. Yet, the Tx doesn't have much preload while the R7 has a lot. The spring on the R7 is not hard to compress by hand, but like what you said, if you are the only one who's working on the gun, a spring compressor helps tremendously.


I know, the R7/HW30 is a pretty good gun, but not the way it's putten together. An HW97K is much easyer to work on. Really two incomparable rifles.

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PostPosted: Fri Jan 11, 2008 8:57 pm Reply with quote
Westonhill
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broommaster2000 wrote:
Westonhill wrote:
AirGunEric wrote:
... As for guns needing a spring compressor- some really do have an huge amount of spring preload, especially some that have been modified. Many guns also don't need a compressor due to very little pre-load. I suspect this spring compressor would work well in an application involving little preload and for someone who doesn't have a helper or an 8' hand span to do it alone.

My Tx is far more powerful than my R7. Yet, the Tx doesn't have much preload while the R7 has a lot. The spring on the R7 is not hard to compress by hand, but like what you said, if you are the only one who's working on the gun, a spring compressor helps tremendously.


I know, the R7/HW30 is a pretty good gun, but not the way it's putten together. An HW97K is much easyer to work on. Really two incomparable rifles.

Yeap! Tx is a much better design.
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PostPosted: Sat Jan 12, 2008 1:43 am Reply with quote
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This guy does have some good ideas which I will probably borrow to improve my compressor.
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PostPosted: Sat Jan 12, 2008 5:56 am Reply with quote
Alstone
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The guy does have some good ideas, but his engineering is a bit suspect. One other thing I noticed about the compressor is that he is using it on a break barrel rifle, it would be a lot safer to remove the barrel before compressing the spring, all it wants is for the barrel to break when he has a load on the spring, and you have a dangerous situation, also a shorter unit would be more stable.

I know that a lot of airguns have very little preload on there springs, but when you get to Chinese rifles they make up for the lack of spring technology by fitting a longer spring at higher compression, and if you are selling something like this to the general public, it should be suitable for everything it is likely to encounter.

Al

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PostPosted: Sat Jan 12, 2008 9:14 am Reply with quote
broommaster2000
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I've read a Weihrauch 85 Spring will fit nicely into a B36-2. Include some spring-guides and you'll have an even nicer and more reliable springer.

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Every springer owner can use one of these... 
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