BoxcarPete
Stainless
- Joined
- Nov 30, 2018
- Location
- Michigan, USA
Right now, we are looking at improving our ability to test parts, and a big part of that will be bringing production of test fixtures (shafts, press-in bores, etc.) in-house. Our customers provide the spec of their intended production shaft for size, roughness, and hardness. We would then be responsible to manufacture a shaft that meets that specification on one end, and mates up with the test rig on the other.
What do all of you use for measuring surface roughness and/or hardness on shafts? Immediate need would be for round shafts from about 1/2" up to about 4" and matching bores. Typical requirements for hardness in the 30s HRC, and surface finish under 0.5 µm Ra for shafts, and 1.5-3 µm Ra for the bores.
Ideally, I would only want one set of equipment for both ID and OD measurements. It seems like a lot of test stand type setups would have a difficult time with both of those, seemingly being ideal for flat surfaces. I'm well aware that indenters that are off-center of a round part can give false readings because of the pressure being applied on an angle to the surface. Is careful fixturing all that is required, or would a more specialized test stand be needed?
Thanks in advance for any and all feedback.
What do all of you use for measuring surface roughness and/or hardness on shafts? Immediate need would be for round shafts from about 1/2" up to about 4" and matching bores. Typical requirements for hardness in the 30s HRC, and surface finish under 0.5 µm Ra for shafts, and 1.5-3 µm Ra for the bores.
Ideally, I would only want one set of equipment for both ID and OD measurements. It seems like a lot of test stand type setups would have a difficult time with both of those, seemingly being ideal for flat surfaces. I'm well aware that indenters that are off-center of a round part can give false readings because of the pressure being applied on an angle to the surface. Is careful fixturing all that is required, or would a more specialized test stand be needed?
Thanks in advance for any and all feedback.