08-02-2013, 03:18 PM
I screwed up the first spring but it wound nicely. I miscalculated the spacing and used 13 TPI instead of 5.75TPI. The second ended up with the correct spacing of the coils but the ID is .020" oversize. In my application it's not going to matter since this 5/16" OD spring is put into a .375" hole. According to the spring calculator the mandrel should be .207" and mine ended up .210" but that certainly wouldn't account for a .020" oversized ID. I think I'll make another mandrel out of some 3/16" CRS and see if that gets me closer to the target ID.
The top spring in the picture is the store bought spring.
The middle one is my attempt at duplicating that spring.
The bottom one is the first one I made that I screwed up the TPI on.
Ed
The top spring in the picture is the store bought spring.
The middle one is my attempt at duplicating that spring.
The bottom one is the first one I made that I screwed up the TPI on.
Ed