Recent content by sirrocco

Gidday Schroder et al, Well I just finished testing both springs and am happy to report the following results. It seems that the 55 - 60% spring is right on the money in terms of force. It shoots that 10 grm coin between 1.5m & 1.65M (60" -67") everytime, I guess depending whether or not the...

Hi Schroder, Thanks very much for your time and efforts with my problem. Its great there are people on the planet that enjoy sharing and utilising their knowledge for the pure enjoyment and challenge. It is appreciated. The striker is the firing pin (28grams) in this instance and is in an...

Hi Schroder, I just managed to get another spring manufacturer to run the spring specs through his computer and he came back with a figure of 20.8 Newton mm. Does that make any sense?

Hi Schroder, I have cut and pasted the link to a conversion calculator below. I re-entered 108"/lbs and got a slightly different conversion of 12.202 nm. Maybe the figure I have been quoted by the spring maker was incorrect? Its still a bit early here in New Zealand to ring another spring maker...

Hi Schroder, Thanks for your help with this. The spring in question propells the firing pin, which weighs 28 grms forward in a straight line. The spring is quite large in diameter and short in length, compared to most other rifles. I just have to make sure there is enough force and preload to...

Hi Schroder, What I have done is put a newly designed firing mechanism in an old styled receiver. This mechanism uses an in line striker, similar to a bolt gun in concept. So the force exerted by the firing pin is in-line with the bore and the center of the primer. Most falling block single...

Hi Schroder, All the numbers regarding the spring I think are correct except possibly the number you are questioning, the 11.3 nm. I was informed by the guy who made it for me, has that the spring a rating of 108"/lbs, which I loaded into a conversion programme on the net and that is the answer...

I have recently redesigned an antique falling block single rifle action and need some help calculating the poundage of the firing pin spring. A test that is often used to determine if a firing spring in a gun is still in serviceable condition is to place a coin, which weighs approx 10 grams...