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Hi All, Thank you again for the responses. The two links EdStainless provided look very promising. I will look through them more carefully tomorrow. I also found something on McMaster that might be a close match (if not the same material): http://www.mcmaster.com/#grade-g-10-garolite/=yjwaei

Compositepro - thank you so much for the info! If anyone knows what this is, it would be someone with the name "compositepro" :) Have you seen this used as a flapper for check valves? Do you know if there is a specific sheet/film material to source or a specific vendor that supplies this...

Hi All, Trying to figure out what this material is (it's a flapper for a check valve). OD is about 7/16". Anyone know? Aaron

So how do I reconcile the moment imposed by the lid on the spring with the torque of the spring (assuming the spring legs will need to be shortened)? Since the torque does not change based on leg length, it seems I cannot simply match a torque specification to the moment calculated from the...

I am designing a lid that pivots out of its frame on one end by means of two torsion springs around the pivot axis. The lid weighs 0.4 pounds and the center of mass is 7 inches away from the pivot axis. Thus, the moment about the axis is 7 x 0.4 = 2.8. Since there will be 2 torsion springs, I...

Is there a way to use the Vickers scale to compare my two known Rockwell hardnesses? I don't have access to test equipment, I'd just like to gauge the relative difference in hardness between the two.

Understood. So how can I compare the two materials, then? How can I know how much harder (even a rough ballpark) HRC 60 is than HRB 60?

I have a material that is HRB 60. I know this material is too soft for my application. I have another material that I would like to use that is HRC 60. All the conversion charts I've seen do not list a conversion between B and C that starts as low as HRB 60 (they start at about HRB 100). How...

I've done some more digging and it looks like a chrome plating will give me both a hard/wear resistant surface as well as excellent corrosion resistance. However, I see that an undercoat of copper or nickel is standard. Anyone know how thick the copper or nickel layer should be? This is for...

Hi, I would like to use a low or mild carbon steel for a part I am designing. The part is a cylinder. A low force (~2lbf) ball spring glides across the surface of the cylinder. I also need to prevent it from rusting. So, I would like to put a zinc coating on for corrosion resistance as well...

I've done the calcs, I'm just not sure how large of a difference I'll see between theoretical axial assembly, and practical manual. Ultimately I think it will be an iterative process. Anyone else have experiences with PC annular joints? The material still worries me for this applications.

Does anyone have experience using Polycarbonate for an annular joint? That's what the customer wants to use, but it seems like too rigid a plastic for an annular joint. What are your opinions? Optical clarity is the reason for the PC choice.

That's what I figured. Thanks, anyway!

In the Bayer design guide for annular joints - seems like a reputable source, no? You can find the guide on Bayer's website ("Snap-Fit Joints for Plastics")

I've read that the mating force calculated for an annular joint is typically much higher than what is actually required to assemble the parts (because the calculated value assumes a true axial assembly, while a manual assembler will always be off axis, making it easier to assemble the parts)...

Thanks so much for the help. I used an ambient temperature for my third and was able to get the answer I was looking for. Thanks, again. Aaron

imcjoek, thanks so much for the link. Their example assumes that multiple temperatures are known in the system. I only know one temperature and am trying to predict my final temperature. Is there a way to do this without knowing q dot? I can use my desired temperature for T2, and calculate q...

Hi, It has been far too long since my heat transfer class in college and I am struggling to do a simple (I think?) problem. Basically I have 3 materials sandwiched together: 1. A heated material (probably stainless at 450F) 2. An insulating material (maybe PTFE...still looking into it) 3. A...