Recent content by craigmj

I'm looking for an agressive one part bonding agent for injection molded TPU materials (90 Shore A). Here is an example: http://www.estane.com/tradename/tecoflex-1-MP.asp Id like to find something that does not require UV light to activate, and is assembly line friendly (non-toxic). What...

Im not asking to calculate flowrate through an orfice, that is not difficult, but rather to understand how to think about my particular problem. The air denisty inside the tank is increasing in proportion to the pressure decrease (ideal gas law). Therefore the mass flowrate through the crack...

Hello Group, I'm creating a test device. This test device will be used to detect a leak in a sealed tank (of air). There is a vacuum inside the tank (low pressure, like under 5"Hg). What I know is the pressure differential, the minimum allowed hole size, the volume of the tank, and the...

Ive tried additive 23 from DOW, as Demon3 suggested. I can tell you that in my case after adding from 1-5% mixture (LIM), there was NO huge difference (I was using a Shincore silicone). There are other things you can do. Dow makes some silicone topcoats which greatly reduce the COF. Mainly...

Thats part of the problem. I cant find a refrence for chinese tool steel grades to check what the composition is. Maybe my first question should be "anyone know what Carbide steel #45 means?" CJ

Group, I have a tool application where the vendor would like to use Carbide Steel #45 in replacement for the speced 416 Stainless Steel. Can anyone tell me the relative corrosion resistance between the two types of steel? Also would be interested to know the relative ferromagnetic properties...

Take PC off your list. Bad chemical resistance to hydroxides and not good for thin walls. Excellent for impact thou. Triax is good (nylon/ABS blend), but low modulus. I have used Grivery with sucess, but dim stability might be an issue. Could add a filler to help, but you open a whole new can...

Roughly speaking: Registration Drill To Datum: 0.05mm Outline Tolerance-Punching: 0.2mm Outline Tolerance-Routing: 0.127mm Hope this helps CJ

Ed- Most Silicones can acheive a low compression set if they are cured for the right amount of time and temperature. By low I mean 5-10%, NOT 1%! That seems impossible to me. What uethane is claiming this? CJ

Yup. I think it was 410MPa MIN and 610MPa MAX @ 20% elongation MIN.This seems like a fairly big range to me, but I'm not a big metals person so I'm not sure how hard it is to hit a UTS number. CJ

OK, I figured this out on my own. RoA = Reduction of Area at fracture point. Thanks

Ive got a customer who specified an ANSI 410 SS and as part of the callout there is a section that says: "50% RoA MIN" Anyone know what this means? btw...This customer is from the UK. Thanks, CJ

Air is the best insulator (well actually a vacuum is), but your batteries may get hot, depending (as people have already pointed out). What kind of batteries are you going to use? What is the energy density and the largest power draw you expect to see. Calculate from this the steady state...

Hi Group, I'm looking for a refrence that explains how to call out brushed finishes. For example Ive seen people call out brush numbers like "#3 Brush", but am unsure exactly what this means. Im using 416 Stainless. Thanks Craig

also depends on what kind of solder you are using. the new RoHS compliant solder is much more brittle than the old leaded stuff.