Cutting a spring
 

Hey there,
I recently bought a JG G36, but its a little hot for me, I am going to order a new spring for airsoftparts.ca, but a thought occurs, I heard that you can cut coils of a spring to reduce its FPS...
Does anyone have any info on this?
how many FPS/coil removed?
I'm still going to order my new spring, but I might try this with my stock spring anyways...

sorry, not sure if this should have been in doctors corner, feel free to move it mods...

Yes you can cut coils on a spring to reduce your FPS. It's a trial and error thing though since each spring is made differently you can't really say you'll get x FPS/coil.

I'd keep your stock spring in case you ever want to upgrade it back up. You've got a new spring on the way anyways and it's useful to have spare parts around.

Technically? Yes.

But why compromise your gearbox over a $20 part?

I'm not compromising it, I'm ordering a better spring...

So you would do what, cut the spring and expect it to lower FPS while it's sitting on your bookshelf?

I realise you're buying a new part, but my responce was one of using the cut spring.

I guess this is like springs to lower your ride...

You can cut your spring but It can go wrong...

Or you can go the safest way and order a new set of springs.

thank you Pacheko, if you read my whole post, i am ordering a new sping, but i am wondering what i can do with my stock JG spring, I am ok if it gets wrecked in the process, mostly I'm just curious...

But how are you going to get the end to sit flush like on new springs?

Also what spring and what fps are you trying to achieve ? 350?

I read the whole post but I wanted to write down my feelings about this ;)

This is what I'm trying to warn you about:

Cutting the spring doesn't just pose the threat of wrecking your spring, it could trash the piston, gears, piston head, cylinder, and tappet plate.

Any number of factors could cause the piston to wobble while firing, putting unnecessary stress on the other parts in contact with it.

well I am using a sotck JG now, Havn't chronoed it, but apperently its around about 370...
Yeah around about 350 would be nice, looking at airsoft parts.ca something like 100 or maybe a 110 spring...

i see shelled....thanks, maybe i shouln't try this :P

100 would be your safer bet. A 110 put my M4 at 380 with a Silent head (lowers fps a little).

shit...would a 90 be too low? airsoftparts.ca says 300 for a modify 90...
But I have heard its more like 315...

I got the 110 spring, I don't think it shoots under 350 fps on my jg g36c, even after I shaved a few teeth off the piston, but that could be due to tight bore i added, so I'm not sure. I think you could just add the washer and bearings to the spring guide to stop the cut end on the spring from gripping into the spring guide causing spring torque.

Also they sell the irregular springs but I have not idea of any adverse effects of cutting coils from one end versus the other with the tighter coils. That is something to consider.

Also new springs work in over a few weeks/months and the FPS gets lower.

lol a 90 makes my MP5K (Yep, K) fire at 315. :|

sorry, Could you please explain this a little? I am very new to airsoft. learning as much about this as I can, but you lost me here :P

Most springs will a bit. Modify ones don't.

thanks alot, Yeah i have already decided to just buy a new spring, at this point I'm just curious as to how easy it is to cut a sring, and if its actually effecive, or if it will just tear up your gun...

on a spring, the ends are double or single coiled (end is flat sits flush against inside of piston and any washer on spring guide), but when you snip it the end is going to be on a angle and not sit flat and the end is going to want to dig in when the spring is going to be compressed and torque will occur in the spring especially if it snags due to being cut. The twisting will cause the spring to prematurely snap over time.

But having the 2 washers and the bearing will allow the spring to rotare eliminating the spring torque:
http://www.ehobbyasia.com/ebayphoto/...guide_v2_1.jpg

I've seen the washers and bearing on the inside of the piston and on spring guide. Mind you I only use one set, I think 2 sets on either side is over kill.


Also there is this general guide:
http://fragcdo.com/2008/02/01/airsof...parison-chart/

ahh, that makes sense, thank you for explaining that syn,
and would it be possible to reshape the end of the spring, back into something usable?

EDIT: regarding your edit M,
I am running a fully stock JG G36c, I am planning on taking it apart soon for the basics, Metal bushing, de-lube .ect
I don't own a chrono, but when using the poor-mans choro on redwolf it breaks both sides easily and almost penatrates the bottom...

It is really tough, but I have not patience or skill for that. I did it a few times with tiny springs using two pliers and time but the AEG spring is super strong. I had to use really big wire cutters (that cut fence) just to to cut it. Then hit it with the grinder to remove the sharp cut end.

The springs are squirted out very hot and then cooled in their coiled shape already from what I saw on tv.

Redwolf poor man's chrony isn't that accurate.
Sounds somewhere in the range of 340-370.

thanks so much for your input guys, on the topic of choro's I heard that there was a much more accurate "home method" using 2 mic to capture the of the BB going though 2 pieces of paper, about 10 feet apart. The only link i could find for this was dead tho...

anyone have info/a link about this??

Yeah I loves my Madbull chrony. It's great.

ah,
thank you
just what i was looking for
and as a new airsoft player, 120 seems like a lot to spend on something like that, I just bought mt first gun, and i think the 120 would be better of put towards mags/upgrades :P

This is true. However it's good for people like me who only have a few airsofters in town and we all use it, and I also upgrade/build/fix guns.

yeah, It's on the shopping list called "someday..." for sure

The Modify 90 spring (with bearing spring guide) puts out between 320-330fps in the few guns I've installed it in. The Modify 100 (with bearing spring guide)puts out around 370fps in guns I've installed it in. All depends on what environment you want to use the gun in I guess, indoors or outdoors. Nothing wrong at all with using a 330fps gun outdoors loaded with 0.28g BBs, it actually works VERY well, even out to 150ft (my MP5A for example).

HA I just realized you live in elora. I am going to Belwood lake next week for pike.

I agree spending $120+ for a chrono is money well spent on something else if you are just going to use it a few times ( thats worth a decent rod $80, some fishing line, and power worms). Another option is to go to a game and get it chronograph ed there. Or may be pay a buddy with a chrono $10 to use his at his house for a few minutes.

oh cool man, belwood lake is nice, and i think thats what i will have to do on the chrono front

Another option, if the spring is non-linear (aka. coils on one end and maybe also the middle of the spring closer together than the rest), is to install the spring with the tighter coils facing the piston instead of the proper way of having them face the spring guide. You could drop the velocity by as much as 30fps, is what I've seen in some testing I've done. Better than cutting coils off the spring; not as good as buying a more suitable spring for your needs.

Pretty sure a JG wouldn't have a non-linear spring :P.

Ok, ill give that a shot, and yeah I'm already going to buy a new spring stalker, to be frank i was expecting my old spring to get wrecked, this was more an experiment then a realistic usefull idea...