GTA
All Springer/NP/PCP Air Gun Discussion General => Machine Shop Talk & AG Parts Machining => Topic started by: Phoebe on October 15, 2023, 09:13:43 PM
-
I'm laying out a spring compressor, but being a novice who hasn't been around many air rifles, a couple questions come to mine:
1) What's the longest receiver/tube I should play to accommodate? (Only frame of reference is my one gun, a Hatsan 95 which is around 19")
2) Similar question: What's the max stroke I can expect to come across?
Thank you, Wise Ones!
-
My mechanic (motorhead) uses an adjustable bar clamp.
In that way he can accommodate many action lengths.
Similar to this:
-
I figure on an overall length of the spring compressor at 42 inches. My jack screw is four or five inches long. If you use a pipe clamp, which is a good option, seek one out that has about a four inch jack screw due to possible preload on the spring. I made my own from a four foot piece of 2 X 4, a modified C Clamp, and some assorted hardware. I've attached illustrations and instructions. If you go to dismantle a Diana air rifle use care to put no pressure on the safety. A dummy pin at least in the rear retaining pin hole in a T01 or T06 version is a good idea.
-
One way is to make the muzzle end stop adjustable. It takes a little more designing and assembly but the flexibility is worth it.
-
I was going to make the muzzle end stop adjustable but got lazy. My compressor is a little longer than I need for any gun so I place assorted wood blocks between the muzzle and the end stop to take up extra space.
-
I was going to make the muzzle end stop adjustable but got lazy. My compressor is a little longer than I need for any gun so I place assorted wood blocks between the muzzle and the end stop to take up extra space.
That'll work too.
-
I was going to make the muzzle end stop adjustable but got lazy. My compressor is a little longer than I need for any gun so I place assorted wood blocks between the muzzle and the end stop to take up extra space.
This ^^ is how I adjust mine.
I have more difficulty with the interface between the rear bridge and various rifle trigger mounts........
loads of interference issues here........
-
Fully adjustable. Make the wooden block you need in minutes because guess what. My compressor also makes a pretty good drill press.
(http://)
-
Fully adjustable. Make the wooden block you need in minutes because guess what. My compressor also makes a pretty good drill press.
(http://)
😂🤣😂🤣
-
I'm laying out a spring compressor, but being a novice who hasn't been around many air rifles, a couple questions come to mine:
1) What's the longest receiver/tube I should play to accommodate? (Only frame of reference is my one gun, a Hatsan 95 which is around 19")
2) Similar question: What's the max stroke I can expect to come across?
Thank you, Wise Ones!
For a spring compressor I use a padded 60" long Groz sash clamp that I ordered from an Amazon retailer years ago on the web.
Very sturdy cold drawn steel frame with a rather long "ram screw". Matter of fact, I can place my HW95 and Beeman R9 "full length" between moving and fixed clamp which is convenient at times.
For years previous to the Groz I used a different bar clamp for spring compression but on occasion I needed to compress the spring "in steps" due to "too short ram screw". Here is a pic of the "too short ram screw" bar clamp with a wooden cradle to support the gun........
(https://i.imgur.com/tWRDkwa.jpg)
The Groz sash clamp I currently use...........
(https://i.imgur.com/0lCRsSf.jpg)(https://i.imgur.com/oXjhY2K.jpg)(https://i.imgur.com/5krUm6g.jpg)(https://i.imgur.com/1s3eF8b.jpg)
Here is a pic showing that it has almost 7" of "ram screw travel"........
(https://i.imgur.com/mRmDUvB.jpg)
-
Let me ask you this: Is there much of a variation to the length of the stroke required from one gun/brand to another?
-
Let me ask you this: Is there much of a variation to the length of the stroke required from one gun/brand to another?
Gas rams require very short compression stroke, like 1/16" to 1/4"
Spring guns may see 3" of preload..........
-
Let me ask you this: Is there much of a variation to the length of the stroke required from one gun/brand to another?
Gas rams require very short compression stroke, like 1/16" to 1/4"
Spring guns may see 3" of preload..........
Thanks! I was trying to wrangle an answer out of someone ;)
I figured it was just a couple inches or so best.
-
The actual preload may be only a couple of inches and that works if the clamp is the correct length. I like a longer jack screw because my spring compressor is never exactly the correct length. With my longer jack screw I need only get my length within a couple inches, the jsck screw will take up the slack.
-
Let me ask you this: Is there much of a variation to the length of the stroke required from one gun/brand to another?
Gas rams require very short compression stroke, like 1/16" to 1/4"
Spring guns may see 3" of preload..........
Thanks! I was trying to wrangle an answer out of someone ;)
I figured it was just a couple inches or so best.
"I figured it was just a couple inches or so best."
I don't know about "rammers" but a new unset spring is a few inches longer than after setting it with the first few cocking strokes.
For me, with the "shorter ram screw length" the HW95 end plug was outside the receiver before it was even compressed and the ram ran out of threads before the end plug was deep enough in the receiver tube to be "locked in place". I used to compress the spring just enough to insert a dowel, then the ram was retracted and end plug/receiver/barrel were re-positioned to the ram for compressing till the dowels would secure the end plug in the correct position.......
(https://i.imgur.com/ezK0Mul.jpg)
To make it easier to install a new unset spring I've resorted to the spring between two nuts on a threaded rod. The nuts were tightened to compress the spring which set the length...........
(https://i.imgur.com/uqcpk2h.jpg)
I did find that "taken to extreme" some recommended "scragging" by compressing a new spring to "coil bound" for several hours. Here is an example of a few new unset ARH spring before installing, after cocking, and "scragged". I found that with the extra Groz "ram screw length" I could compress a new unset spring in one step, then do the final setting simply by cocking the gun. I tried "Scragging" ONCE and didn't like the result with a brand new ARH spring. Installing the "scragged" spring in the HW95 I found that the velocity was reduced 100fps vs the spring that was set by simply cocking........
(https://i.imgur.com/8Ud7nUB.jpg)
Don't know much about gas ram piston guns except that once the internal pressure in the ram is released for recharging after repair (well, some can be repaired) it requires a high pressure pump to restore the internal pressure.
-
I upgrade the spring guides in many of my coil springers. The largest rifles, Hatsan Mod125/135s, have almost 3" spring preload. I buy mostly refurbished/used rifles unless they are similarly priced as new "Clearance/Closeout" specials. The almost 3" is with "used" springs so new unset coil springs will be longer. With that in mind I redesigned my last spring compressor using a cut 6" c-clamp from Harbor freight, some 2x4 lumber, and a few small scraps of plywood for reinforcement. VERY similar to some designs already posted.
I make little accessory bushings for each rifles endcap to prevent damage to the caps and/or any safety levers. On the Hatsan rifles specifically I find it is MUCH EASIER to remove the barrel AFTER the spring pressure is relieved so I have made small adapters to allow springs to be removed/replaced with the barrel attached.
Air/Gas springs need no more than 3/8" preload.
If you have or plan to get a Magnum (coil) Springer like a Hatsan Mod125/135 I suggest you design the spring compressor with a MINIMUM of 4" travel.
-
Fully adjustable. Make the wooden block you need in minutes because guess what. My compressor also makes a pretty good drill press.
Easy enough. To compress the spring, are you using the quill or raising the table?
I have several small DPs, new and disassembled. Might make a good basis for a dedicated spring compressor. hmmm
-
I upgrade the spring guides in many of my coil springers. The largest rifles, Hatsan Mod125/135s, have almost 3" spring preload. I buy mostly refurbished/used rifles unless they are similarly priced as new "Clearance/Closeout" specials. The almost 3" is with "used" springs so new unset coil springs will be longer. With that in mind I redesigned my last spring compressor using a cut 6" c-clamp from Harbor freight, some 2x4 lumber, and a few small scraps of plywood for reinforcement. VERY similar to some designs already posted.
I make little accessory bushings for each rifles endcap to prevent damage to the caps and/or any safety levers. On the Hatsan rifles specifically I find it is MUCH EASIER to remove the barrel AFTER the spring pressure is relieved so I have made small adapters to allow springs to be removed/replaced with the barrel attached.
Air/Gas springs need no more than 3/8" preload.
If you have or plan to get a Magnum (coil) Springer like a Hatsan Mod125/135 I suggest you design the spring compressor with a MINIMUM of 4" travel.
I did something similar using a 6" C Clamp and just cut the fixed part off. I've only used it on my Diana m48 to install a vortex spring kit. I might be trying it out on my hatsan 125 springer after I get my impact working the way I want. Don't really shoot my springers much.
-
Let me ask you this: Is there much of a variation to the length of the stroke required from one gun/brand to another?
Some of the things I found to consider are an under lever or side lever you might need something that will accommadate something longer. And I have a piece of broom handle if stuff needs to go deeper into the receiver. Make sure it's slim enough not to get stuck in the receiver.
-
To ease the installation process, if using ARH/JM replacement main springs,…always have them preset. It’s a $3 service well worth the cost. A fresh unset spring can be a huge headache sometimes.
-
I made my compressor as long as the longest anticipated gun/spring combination I could imagine.
I adjust to a shorter length as needed by inserting wood blocks to take up the space.
someday I may relocate the support closest to the clamp end, as it can interfere with
the trigger housing on rifles that have the housing welded to the air tube.......
-
I use a scissor jack. Those things are easy to find and adapt. Usually free. And have more length for stroke then you'll ever need. Plus they can lift a car so the springs are not even close to a challenge for them.
(https://www.gatewaytoairguns.org/GTA/gallery/albums/Jeff_1/Dir_1/main_5646.jpg)
Everything in that picture was scraps and leftovers so no money actually involved in building it.
May not be pretty but I want function over looks.
-
I jumped on a close out sale on one of these.
https://www.opticsplanet.com/sun-optics-spring-compressor.html
(https://op2.0ps.us/978-550-ffffff-no-upscale/opplanet-sun-optics-spring-compressor-matte-black-st1700-main-1.webp)
-
dang... missed out on that one. Looks likes a good unit.