Micro Hardness of Screw Tip?
Micro Hardness of Screw Tip?
(OP)
I have a new prototype for a screw that doesn't seem to be performing as well as the competitors. They are self-drilling screws that are meant to drill into at least two panels of 18 gauge sheet steel. Normally, our self drilling screws have a #3 drill point at the end, but these have a sharp point, similar to a wood screw. During installation testing, the tip just spins on the metal and eventually wears out and becomes dull without driving into the material. Given almost identical material and geometry to our competitors, my assumption is that our heat treating processes are different. I want to mount both samples and check for micro hardness at the tip, but I'm wondering what the best technique to do this is. Obviously I wont be able to take readings right at the tip, and will need to take some material off. Any ideas on the best way to mount the screws to do this?





RE: Micro Hardness of Screw Tip?
RE: Micro Hardness of Screw Tip?
rp
RE: Micro Hardness of Screw Tip?
RE: Micro Hardness of Screw Tip?
http://www.buehler-asia.com/brochure/apps_support-...
http://www.struers.com/resources/elements/12/14376...
RE: Micro Hardness of Screw Tip?
The way to mount the part is to cross cut the shank so that you have the tip, then make a mount of that with the shank parallel to the surface and then slowly work it back to the cross section that you need. If you need to learn how to mount fasteners you are going to have trouble with this project.