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  1. mrPelagic

    precision torque tester?

    Hello! We are looking to add a precision torque tester to our lab. No one, including myself, has any experience with these type of testing systems. We need low-ish torque (lets say 10oz.in), would prefer up to 60rpm, but can settle for less. Anyone with experience with this type of equipment...
  2. mrPelagic

    boring question:6061 vs 2011 al

    ok, good. so I am not crazy. thanks again. I used to use tons of 6061-T6 in my marine engineering days. this decision is being made by procurement. I have heard that the particular shop in China has trouble sourcing 2011?? this whole thing does not give me a warm fuzzy- too many illogical...
  3. mrPelagic

    boring question:6061 vs 2011 al

    thanks berkshire. sounds like it's cheaper to machine 6061 in china than 2011 here. tbuelna, i agree. surprisingly, we have had great success with just typeII anodizing for many years. I would never have gone there, but speeds and loads are low, and it appears to work. btrueblood, this is a...
  4. mrPelagic

    boring question:6061 vs 2011 al

    Hi There! I am interested in pragmatic details between Aluminum alloy properties as related to an application that I have. 2011-T3 vs 6061-T6 for application of a machined part (involving screw threads) in production. It is used for positioning, so *loads and speed are very low*. we need about...
  5. mrPelagic

    best molded thread form for low friction

    Hello! I am looking to position something with molded threads. it's small, low load. I'd like minimum friction. Since I am molding the threads, I have some freedom. backlash is not a big issue. I am thinking buttress- type threads will give less friction than acme or others. it will be a very...
  6. mrPelagic

    Any idea what this spring is called?

    Hi All! Please see the image. It shows the workings of an eyeglasses case that has bi-stable lid. The spring straddles the hinges. This spring is what drives the glasses case to have the open-or-closed-no-in-between functionality that I crave. I am looking for ways to create a compact linear...
  7. mrPelagic

    thread modeling

    pylfrm& drawoh, thanks. Ahhh. Funny , i often felt that I'd been hacking my threads incorrectly all these years. I'll try the drawing the PD instead. Yes, totaly within resolution of some 3d printers (but true, i dont think Fdm could do it- at least not well) we use a polyjet system to print...
  8. mrPelagic

    thread modeling

    I am modeling some threads for 3d printing and eventually polymer injection molding. The threads do not look right to me, but the dimensions are nominal from the machinery handbook #27 (&28 as a sanity check. Please see the attached picture, the purple threads (witch are internal threads). (the...
  9. mrPelagic

    moment of inertia units in Solidworks?

    Does anyone know the units that solidworks is using to compute moment of inertia? I am trying to size a stepper motor, and am a bit confused. It's been a while, but it looks like it's (pounds force * in^2) I=.5mr^2 (for a cylinder) which translates to (kg*m^2) or (lbm*in^2) or [(lbf/32.2) *...
  10. mrPelagic

    combined stress calcs: pressure and thermal

    Hi I am trying to find some calculations to predict the combined stresses in a borosilicate dome. Any help would be great. Specifically, I am designing a sub sea pressure housing for a high temperature light. I will be using a glass hemisphere, outside pressures will reach up to about 2000...
  11. mrPelagic

    looking for mechanical glass properties

    good point. low cte does mean less thermal stress- my mind was on the seal interface. the housing will be filled with dry air and dessicant. I will probobly use a high temp seal such as a fat silicone o-ring, but I have actually seen standard low temp buna seals used in a similar...
  12. mrPelagic

    looking for mechanical glass properties

    I don't need a low CTE. Actually, a higher one would be preferable, as the rest of my houisng is aluminum. That is not much of an issue after a bit creative mounting, however. I think the hemisphere will be about 5 inches OD. One of the factors determining the diameter is the temperature...
  13. mrPelagic

    looking for mechanical glass properties

    Hi I am looking for properties of high temperature glass (borosilicate, maybe quartz). Specifically, I am designing a pressure housing for a high temperature light. I will be using a glass hemisphere, outside pressures will reach up to about 2000 psi. The temperature differential is what...
  14. mrPelagic

    glass dome on pressure vessel

    I am designing a sub-sea HMI light housing. I want to use a glass dome (borosilicate?) mounted on an aluminum housing. Does anyone know if glass responds to stress linearly? I know that acrylic does not respond linearly when used for a pressure housing, which is why i ask. for general info...
  15. mrPelagic

    Powering an HMI Light

    I have been charged with integrating appropriate electronics to produce some sub-sea HMI lights. One option we want is to be able to power them with either AC (120 or 240) or DC(240). Various ballast manufacturers have told me it's not possible to power an AC ballast with DC. Makes perfect...
  16. mrPelagic

    Submersible Feedback Hydraulic Ram

    I am looking for a feedback ram to be used on a submerged robot. Preliminare estimates are for a ~2 inch bore; wiper based sensor; 8 inches of travel; about 500-1000 psi system pressure. Operating depth will be down to 1500 meters (~2200 psi). I have looked at Penny & Giles, and Parker. Has...
  17. mrPelagic

    machinable plastic for low temp use?

    I am designing a part that will live submerged in sea water, under the bow of a boat. It will be exposed to freezing water for relatively long periods of time (Alaska). I need a machinable plastic, and I can't find much data for notch toughness of plastics at that temperature. I was...
  18. mrPelagic

    anodizing ACME threads

    Sorry- I should have specified a .002" build up of hard coat anodize. I am just wondering if anyone had any practical experience with anodizing ACME threads.
  19. mrPelagic

    anodizing ACME threads

    I am designing a system where ACME threads will be cut in 6061-t6. What I am looking at right now is ~5"-10 tpi ACME. The threads are being used to restrain a large pressure induced force so low backlash is not a requirement. We will hard anodize these threads with to .002" thick. The...
  20. mrPelagic

    galling in 6061 threads

    We have an intermittant problem with thread galling and seizing between mating 6061-t6 aluminum parts (an oil filled container and its cap). I know that this is a tricky situation, but there does not seem to be an option for us. The pieces in question are of a diametrical range between 2 and...

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