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  1. RichLeimbach

    Energy storage and release.

    This is a bit of a brainstorming exercise, so all comments are welcome: Looking for the most compact way to store and release energy in a particular application: Here are the specs. Less than one kg weight. As small as possible Less than $50 USD Takes in mechanical or...
  2. RichLeimbach

    Can the spring rate of rubber components be determined from hardness?

    Adding a little extra to the good posts above... Don't forget that there will be quite a bit of damping involved if you are hitting this with any kind of speed at all. Just doing force / deflection tests might not give you a good understanding of the actual forces at work in real operation...
  3. RichLeimbach

    Most/Least Interesting MechE Jobs...

    This is an interesting topic. My own personal opinion(s): There are very few jobs that are 100% engineering (if any) and there is a big difference between the type of engineering needed for a product and the actual job itself. For example, you may be really interested in aircraft design and...
  4. RichLeimbach

    Fake UK Plug

    Another 2 cents: Sounds like from your last post that the main problem is YOUR company, and not the Chinese ones. Always choosing the cheapest company regardless of quality, reputation, etc. will get you in trouble just as quickly with Western companies (who can also do some amazingly shoddy /...
  5. RichLeimbach

    Fake UK Plug

    I agree with both IRStuff and Scotty. Obviously, the best thing would be to make the product where people are capable of realizing this kind of mistake quickly and the assembly workers are empowered enough to step up and correct the errors (I've seen that they tend to be too afraid to make...
  6. RichLeimbach

    Wire Rope Selection

    Pretty good overview here... http://www.findarticles.com/cf_dls/m3125/n12_v70/21038619/p1/article.jhtml Also, Machinery's Handbook has a nice section and most vendors have good design guidelines in their catalogs. Might want to pick up a few of those. - Rich
  7. RichLeimbach

    Making a slow linear movement without motor?

    I agree with alpharam that a gas spring would be a good choice. If you cannot find one that fits your cost / size constraints you can talk with Nye Lubricants. They've got a good range of damping greases that you can use with a custom design like you were talking about. You might be...
  8. RichLeimbach

    Motor's Maximum Inertia

    The best way would be to model the rotating parts of the assembly (shaft, windings, etc.) in a 3D CAD package, set the correct material densities and then have the computer tell you what the combined interia is. Alternatively, you could estimate it by checking the diameter of your rotor...
  9. RichLeimbach

    Friction coating with good durability under high pressure?

    Trying to replace the grease in part of our system with a dry film lubricant. The application is for a ball bearing (chrome steel) running in a helical (Rc 60 D2 steel) track. The high pressure on the ball (~100ksi) and the twisting, scuffing motion at the contact patch causes the system to...
  10. RichLeimbach

    Commutator wear pattern

    aquilajohn, Check out the Morgan Carbon literature in this link: http://www.morgancarbon.com.au/commutator%20leaflet-A4.pdf Looks to me like you have what they call "slot bar burning". Not sure exactly what the best way for you to fix it is though...
  11. RichLeimbach

    High coefficient of friction material

    unclesyd... Thanks for the input. I have been thinking about this type of material, but I need higher coefficient than what is listed on the materials in your link. The reason I need the high coefficient is that the pressure I can apply to the surface is limited by the rest of the mechanism...
  12. RichLeimbach

    High coefficient of friction material

    Looking for a material that has a high coefficient of friction ( >.5) and is capable of withstanding very infrequent high energy stops (3ms duration with 1000W/in^2 energy at surface every 2 seconds). Temperature of rotor rises to about 100F from room temp under heavy use. Currently, we are...
  13. RichLeimbach

    useful information on zylon/pbo?

    I've done a little work with it. It's got a really good max loading, but seems to be more susceptible to breakdown due to environmental factors (particularly UV) and and is not as resistant to cyclic fatigue in bending applications as some of the other high strength stuff we tested...
  14. RichLeimbach

    Thin Walled, Black Nylon Tubing For Wires?

    Check out www.heatshrink.com they have a huge listing of colors and styles of tubing. I'm sure you can find something there. - Rich
  15. RichLeimbach

    Wire Rope Shearing Force

    I would say that the construction of the wire rope will make some difference also. I think that wire rope of 1x7 construction would be much harder to cut than a 7x19 rope of the same cross-sectional area, since in the 1x7 rope the individual wires you are shearing have much larger size. I...
  16. RichLeimbach

    Motor balancing spec.

    I have a rotating member in one of our products that is spinning at a relatively high rate of speed (18,000 RPM). I would like to get this component balanced to reduce vibration, etc. I am thinking of using the specs from a electric motor armature of similar size (maybe a 48mm motor) and...
  17. RichLeimbach

    nonmagnetic/electrically nonconductive/low outgassing

    If the material does not have to be non-conductive anymore, just non-magnetic, why not use a non-magnetic stainless steel (maybe 304) ?
  18. RichLeimbach

    Ways to Compress Air

    I agree with IRStuff. This is not something we can discuss effectively without knowing: The volume of air needed, the cycle rate, the necessary efficiency, and other details. Can you give some more info on this?
  19. RichLeimbach

    High PV value friction material?

    Ed, We're also trying to hold the OD as small as possible and the increased yiled strength is something we are looking for. Unfortunately, we are not able to lubricate this surface, but with our very small time period of slip (3 milliseconds) heat has not proven to be a big problem so far...
  20. RichLeimbach

    High PV value friction material?

    Ken, Thanks for the info. We had previously tested the carbon-carbon and have found it to be a pretty good material for our application, which had some firctional variation, but generally stayed within the range we needed. It was definitely expensive, but less so than a failed product. We...

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