Some of you have maybe seen photos of the mechanism im making...
Well, I have made 2 now and they seem to work very well, I will soon put it in a speargun and test it.
Although a problem have com up, I cant seem to find stainless spring steel in round bars with a diameter of about 7-8mm,I understand it is the steel commonly used for making shafts.
I have been told I can buy a steel called "SS 2331-06 (DIN 17224) from a big company called Sandvik but they only sell it in bulk loads of 260kg for over 1000€! And I only needed a few meters! :ko
The end of the shaft must look like this in order to fit my mechanism, the hole in spear must be 3mm wide. How thin a spear do you guys think I can use? One way to do it is to order regular spearshafts and modify them but that will sort of undo the meaning of the mechanism which is to optimize the length of the barrel and to apply the force at the back of the spear. If I buy a shaft it will have notches of fins so the shaft will be weakened. Maybe I can buy shafts for pneumatics and use?
I asked a spearfishing shop what type of steel it was and got the answer: "17-4PH stainless steel 44HRC". I am not an engineer so I dont really know what type of steel I am looking for, I guess it has got to be hard as hell and stainless!?
So the questions are: How thin can the spear be without becoming to weak in the end part and not damage the wishbone?
What type of steel should I use?
Where can I find the right kind of steel?
btw, I have access to a great machine shop so I can do all kind work on it, except heat treating it for stiffness.
Thanks!
Ivar Nelson
Well, I have made 2 now and they seem to work very well, I will soon put it in a speargun and test it.
Although a problem have com up, I cant seem to find stainless spring steel in round bars with a diameter of about 7-8mm,I understand it is the steel commonly used for making shafts.
I have been told I can buy a steel called "SS 2331-06 (DIN 17224) from a big company called Sandvik but they only sell it in bulk loads of 260kg for over 1000€! And I only needed a few meters! :ko
The end of the shaft must look like this in order to fit my mechanism, the hole in spear must be 3mm wide. How thin a spear do you guys think I can use? One way to do it is to order regular spearshafts and modify them but that will sort of undo the meaning of the mechanism which is to optimize the length of the barrel and to apply the force at the back of the spear. If I buy a shaft it will have notches of fins so the shaft will be weakened. Maybe I can buy shafts for pneumatics and use?
I asked a spearfishing shop what type of steel it was and got the answer: "17-4PH stainless steel 44HRC". I am not an engineer so I dont really know what type of steel I am looking for, I guess it has got to be hard as hell and stainless!?
So the questions are: How thin can the spear be without becoming to weak in the end part and not damage the wishbone?
What type of steel should I use?
Where can I find the right kind of steel?
btw, I have access to a great machine shop so I can do all kind work on it, except heat treating it for stiffness.
Thanks!
Ivar Nelson