Experimental Zone: Anyone have experience with rubber dampening?

[arbantelope]

Has anyone ever used a rubber washer (or other material) sandwiched between two polished washers, ahead of the tophat?
Searched the forums, but did'nt find much.
I'm doing some experimenting with my S1K.  AKA "the victim".   lol
Thank you.

Alan - NorCal

[speedturtle]

You can fabricate a delrin washer and it will hold better to that force coming from the decompressing spring. Just a suggestion, as one of my close airgun buddy has already done that with success.

[arbantelope]

I found something the Honorable Tuna-Meister recently posted that speaks to the same area. (much better wording/lingo used)

"Also, use a thin polished stainless steel washer between the face of the hat and the bottom of the piston lubed with moly. This will greatly reduce the spring torque and decrease the spring cocking resistance during the cocking cycle and make for smoother cocking. Do not use Delrin."

THE BRAINSTORM
It's between the face of the hat and the botton of the piston that I am considering installing my rubber washer (2 different thicknesses I'm going to try) sandwiched between two polished ss washers.  Has this been done before?  Pros/cons?

CURRENTLY: The S1K experiment victim is fully tuned and lubed with new spring & JM pimp juices.  Blows 7.9 CPHP's @ 920ish.  Abrupt recoil when shot, solid, but abrupt.  New Tuna trigger., YESSSSS  :-)     (pellet count: 3500+, still stock seal/tube walls)

MY GOAL: Determine if the shot cycle can be changed (dampened/softened/less harsh, etc) for more accurate shooting, with no loss in performance. Less jarring of the scope/vision when shooting.

Thanks.

[kiwi]

like this.....?

don't use rubber..yer need  nylon ,,,rubber will grip
and transfur more spring twist in to the gun..
It also deadens the noise by removeing steel to steel contact..

Charlie's right ...don't use delrin...Its cheap nasty garden verity nylon...& to
soft and will destort under pressure/impact...
I use a dense Tyvar....Or any nylon/PTFE designed for berrings...
theres a yellow stuff that would be Ok...but can't think of its name...

Pete

[djmyers]

WHen it comes to adding washers I read about them going in front of the top hat but the last pics show them riding on the top hat where the spring directly touches them. My questions are where should they go? Infront of the top hat or on it? Also if you place the washers in there it will compress the spring more and in theory give you more force, to an extent. If you add to many it will kill the spring. SO what is the magic number or thickness which will not be too much? I am thinking of doing this to my daughters big cat to try to make it just a little smoother. Trying to squeek out everything I can.

[kiwi]

djmyers - 5/21/2010  3:44 AM

WHen it comes to adding washers I read about them going in front of the top hat but the last pics show them riding on the top hat where the spring directly touches them. My questions are where should they go? Infront of the top hat or on it? Also if you place the washers in there it will compress the spring more and in theory give you more force, to an extent. If you add to many it will kill the spring. SO what is the magic number or thickness which will not be too much? I am thinking of doing this to my daughters big cat to try to make it just a little smoother. Trying to squeek out everything I can.

Hi...
those washers are not for weight or to increase preload...they stop the spring ends
imbeding into the nylon and causeing binding between the spring
and nylon sleeve over the guides...

Wheather the washers are on the giudes or in front the efect is the same
weight & spring peload...The system in the pic has the same space for the
 spring as the standard unit had..just the rear  guide has been changed
to give the same stack length & total weight is 1.5 grams lighter than standard..

Pete

[arbantelope]

I installed in this order today....

piston
ss washer
neoprene washer (1/16" approx thickness)
ss washer
top hat
ss washer
spring
ss washer
spring guide

Just one extra ss washer and the neo.
Cocks buttery, no different really.  Only about 20 pellets thru it before it was dark, need to mount the scope for testing tomorrow.
After a couple hundred pellets I'll take it apart and see if the neoprene washer shows any signs of abuse.