Since joining the guild,I have seen several postings from members who have wanted to use a leaf spring to make a crossbow prod.The project killer that they come across,is the locating hole in the middle of the spring.Although I have'nt done it myself,I believe there is a way to do it,and retain the strength of the leaf spring.Get an experienced welder to fill in the hole with an arc welder.Leaf springs are hardened and tempered,and generally speaking,it is not a good idea to expose them to enough heat to ruin the temper,rendering them useless as a spring.Arc welders create metal melting temperatures instantaneously,and a leaf spring has some mass.It takes time for heat to travel through metal and reach tempering temperature,if the metal does not exceed tempering temperature,obviously, temper will not be affected.If heat can be rapidly removed from the weld area,then I think that the small local difference,where the weld meets the edge of the hole will not compromise enough hardness to make a difference.Brownells,the gun supply people sell a compound for this purpose,but I believe the same result can be achieved by packing and wrapping the leaf spring with wet rags as closely to the weld as possible.Weld strength is not an issue.All welding rods are numbered,the most commonly used rod is 6011.The first 2 numbers indicate the point at which the weld,when properly done,will break or fracture,with 6011,the breaking point is 60,000 lbs. per sq. inch.Welding rod also comes in different materials,such as mild steel,stainless steel,cast iron,and various steel alloys,so if you're bothered by having 2 dissimilar steels mixed together,a good welder should know what rod is compatible.I own an arc welder myself,and use it,but I know I am not skilled enough to be sure of a perfect weld,that is why I recomend a skilled welder,it would take him(or her,lets not be sexist)no more the a minute or two to do this job.I see no reason why this method will not work.having said that I'm sure there are members out there who have more experience in this area than I do,and I would appreciate their thoughts or criticisms.
Hermit.
Hermit.