Grease Gunner Posted August 3, 2020 Report Share Posted August 3, 2020 Hello All:After having the buffer pilot failure which i fixed with a WW2 Savage, My attention Now Turns to Replacing the Bent and Kinked up springI plan to photo the Actuator which is knurled so members can tell me if its a WH or not. After having the Buffer pilot go out the back another inch and stop; it has me worried about making sure the internals are GI So with the Recoil Spring for the 1928 and 1928a1 spring, does anyone know the quantity of coils and the coil thickness so I can sort my springs? Thanks! Link to comment Share on other sites More sharing options...
bob241 Posted August 3, 2020 Report Share Posted August 3, 2020 look at the print. look on left side, pick out prints, go down to spring, recoil http://www.nfatoys.com/tsmg/pdf/5153024.pdf Link to comment Share on other sites More sharing options...
Grease Gunner Posted August 3, 2020 Author Report Share Posted August 3, 2020 Thanks so much! Link to comment Share on other sites More sharing options...
Grease Gunner Posted September 7, 2020 Author Report Share Posted September 7, 2020 Has anyone clipped coils off a recoil spring to make it run slower?? Link to comment Share on other sites More sharing options...
StrangeRanger Posted September 7, 2020 Report Share Posted September 7, 2020 It's counterintuitive but cutting a coil spring actually increases the spring rate Link to comment Share on other sites More sharing options...
Grease Gunner Posted September 7, 2020 Author Report Share Posted September 7, 2020 It's counterintuitive but cutting a coil spring actually increases the spring rate I have always heard the opposite that a stiffer spring really sends the bolt home much faster on the return . Link to comment Share on other sites More sharing options...
StrangeRanger Posted September 7, 2020 Report Share Posted September 7, 2020 When you cut a coil spring 2 things happen:First, the spring rate, i.e. lbs/inch of compression, increasesSecond, for any amount of bolt travel the spring will be compressed less So the spring restoring force at any given point of bolt travel may be more or less than before you cut it due to the reduction in force from the lesser initial compression but the spring will gain force at a higher rate as the bolt motion continues. It can all be calculated but it's really not worth the effort FWIW just buy an Extra Force recoil Spring from Wolff and call it good Link to comment Share on other sites More sharing options...
reconbob Posted September 8, 2020 Report Share Posted September 8, 2020 It may be counter intuitive, but if you say, cut the spring in half, there wouldbarely be enough power in the spring to move the bolt forward. The bolt would recoil much faster due to less spring force, and counter recoil/move forwardvery slowly due to a much weaker spring. So reducing the length of the springwill not increase the rate of fire. I think you can use a Grease Gun as an example. Heavy bolt, light springs,very slow (for an SMG) rate of fire.. This reminds me of years ago in Sports Illustrated they had an article wherea guy researched the science of shooting a basketball and he concluded thatthe higher the ball was shot, the larger the area available for the ball to fall thruthe rim. In other words, a high lobbing shot has a better chance than a line drive.He was set upon by many because according to his calculations (as Wiley E.Coyote would say) the shot with the highest percentage of success would be a shotthat went straight up, which of course has a zero percent change of success. Bob Link to comment Share on other sites More sharing options...
StrangeRanger Posted September 8, 2020 Report Share Posted September 8, 2020 If you cut coils off a spring the spring rate in lbs/in will always increase. However, there will also be an offsetting loss of force due to the fewer inches of initial compression so the net effect may or may not be a gain in restoring force at full stroke in any given application. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now