The (new) Crosman Forum, your first and last stop for all things Crosman

 photo 63f5b325-0274-4312-9dbd-2effde5b3715_zps0x27orls.jpg

Alan Alford's build

2250b Tube for later move to bulk CO2.
12" .22 Caliber Barrel from Doomsday Backpacker
Brian & Assoc. Alluminum Breech with 2 barrel screws
Original site rear
Pin site on Custom Mt. Airguns Muzzle Break
2x1 Centerpoint Scope with UTG dovetail adapters
Mountain Airguns Custom Bolt and Handle
Mountain Airguns Custom Power Adapter and spring guide
B&A Boss Valve for extra Power

Built mainly for fun and to shoot at local Field Trial Pistol Match.

It currently it shoots a 14.3 Crosman Hunting Pellet at about 530 fps in a 72 degree room for 8.92 FPE.



 Return to Index  

steel cable breaking strain !

February 27 2012 at 12:53 PM
Ged  (Login gedfinn)
Crosman Forum Member
from IP address 86.151.19.179


Response to Don't underestimate the (hidden) technical challenges Ged's looking at, Rob.

Hi,
On checking,I see that the breaking strain of the 2mm
( 3/32 )wire rope I am using, Is 950 Lbs !!!!!!
http://www.shopwiki.com/l/wire-rope-strength

When the sear holding the rear piston is released,
the pressure on the rope almost dissapears ,( They are both travelling in the same direction )
Thats in relation to the wire ?

Also when both pistons bounce back off the air cushion the load on the wire diminishes completely ?
I have some 1.6 mm wire ( Thats where I got the 500 Lbs breaking strain from )
And I might well use it ? ( Its well up to the task ) In my opinion.

In my opinion, the 2mm wire is at least 5 times over strength

Having said all of that, Lets not look for what might not work ! A larger wire or even the chain I have could replace it !

Until its up & Shooting, we will never know !!!
I also don,t think the pistons have to be balanced ( They will be ) Or even the same length ( They will be )
The pressure on compression will allways be equal on the face of both pistons, Even if one should arrive early ?

Only a shooting unit will give the answers,
All the best, Ged.


    
This message has been edited by gedfinn from IP address 86.151.19.179 on Feb 27, 2012 12:58 PM


 
 Respond to this message   
Responses

Crosman Corporation 1-800-724-7486
This forum is not affiliated with the Crosman Corporation in any way// Information presented in this forum is intended for informational purposes only; use at your own risk//Posts made to this forum are soley the opinion of the individual member