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  1. FeldmanWill

    Simulating Deformation with a gap

    It's true scale. Simulation doesn't understand there is another surface.
  2. FeldmanWill

    Simulating Deformation with a gap

    I'm trying to run a fairly simple simulation and getting nowhere with it. I'm simulating compression of a cantilever tab until it hits a stop. After that it should go into sliding support against that stop and 2-point supported beam deformation. I'm probably not using right solver and/or...
  3. FeldmanWill

    Centrifugal g force testing

    I have trouble grasping direction of a g force. I'm doing g force testing in a centrifugal apparatus. My question is- in which direction is g-force acting? Working with rotating equipment for a long time I know that centrifugal force is acting to the outside. That force is counteracted by...
  4. FeldmanWill

    Tolerance +/+ -/-

    That's why I always get 3 quotes. [bigsmile]
  5. FeldmanWill

    Tolerance +/+ -/-

    I do use nominal to convey design intent: 3" shaft for 3" hub and then fine tune it for machine shop with tolerances. Engineers look at nominal dimensions and machine shop looks at limits. I guess I worked too long for a place where machinists knew my quirky ways but now I have to outsource...
  6. FeldmanWill

    Tolerance +/+ -/-

    I have been using +/+ or -/- tolerances for a while now with no problems. For ex.: shaft 3" +.005/+.010, hub 3" -.005/-.010. Means shaft can be 3.005 to 3.010 and hub 2.995 to 2.990. This keeps my dimensions simple, clear and clean but tolerances drive the machining limits. Lately somebody...
  7. FeldmanWill

    DBTT Ductile Brittle Transition Temperatures Tables

    metengr and Ed thank you. That's kind off the feeling that I had, thank you for confirming that. Still a little itchy to try it out in the lab. I found a goofy DBTT chart that at -40C(F) between 1040 and 1060 steels enter brittle zone, can that be confirmed. I don't have smart metallurgical...
  8. FeldmanWill

    DBTT Ductile Brittle Transition Temperatures Tables

    I have experimented with Delrin and at room got 225 lbs pull and at -40 it was 255 lbs I have experimented with Aluminum and at room got 275 lbs pull and at -40 it was 285 lbs I would like to find a material that will do the opposite go from 225 to say 150 lbs. The only physical property I...
  9. FeldmanWill

    DBTT Ductile Brittle Transition Temperatures Tables

    Design calls to hold 230lbs in ductile region which I can easily calculate. And yield strength to drop to hold only 150lbs at -40C(F) which I can also calculate if I get different materials yields at that temperature. Is that something that do-able in a sense can force be controlled in brittle...
  10. FeldmanWill

    DBTT Ductile Brittle Transition Temperatures Tables

    Does anyone have Ductile Brittle Transition Temperatures Tables for steels. I found one on the web but not sure if I can trust. Particularly I'm looking for a material that becomes brittle at -40C(F). Thank You in advance
  11. FeldmanWill

    2 Cylinder Synchronous Aplication

    Customer will really love ropes running through the machine. :)
  12. FeldmanWill

    2 Cylinder Synchronous Aplication

    The spring has only 1/8" travel and isn't spring move vs. that cyl. twisting the frame and once other side catches up because it has less load spring will go back to relaxed state?
  13. FeldmanWill

    2 Cylinder Synchronous Aplication

    I know there is a lot of posts regarding this application but all of them are closed and there is a solution I want to run by you. I got the same situation with 2 cylinders lifting a bottom frame about 4” both of them are acting in synchronous motion. I can’t put anything in the middle-thus 2...
  14. FeldmanWill

    Dry eraser board or coating

    Yep thats kind off what the proper way spells out. Aluminum is picky. And nobody made one product can.
  15. FeldmanWill

    Plastic Square Structural Tubing Frames?

    Found this to be close but I still wanted 2"SQ. http://www.usplastic.com/catalog/item.aspx?itemid=74682&catid=817
  16. FeldmanWill

    Dry eraser board or coating

    Any tips for making enamel stick to aluminum. It's fingernail scrapeable which is not desired. I bought aluminum primer and scoffed up aluminum piece prior and still enamel and epoxy can be scratched off. Is there a painting technique or product that can solve this problem?
  17. FeldmanWill

    Stepping up Voltage

    Understood- but not an option.
  18. FeldmanWill

    Stepping up Voltage

    I think both of you guys gave me two solutions that I needed. For prototype I will get a ready made unit. For final product I need low cost-low cost-low cost and footprint. I think the numbers I'm playing with is IN= 12V, 5 Amps; OUT=24V, 2.5Amps. It's driving DC motor so I don't think...
  19. FeldmanWill

    Stepping up Voltage

    Mech. Engineer so not too much electrical circuit knowledge. My question is what the easiest (cheapest) way to step up DC voltage 12v to 24V in ranges? Thank You William
  20. FeldmanWill

    Plastic Square Structural Tubing Frames?

    Does anyone know a company that makes plastic square tubing with all connectors (elbows etc) for making frames. Something like 80/20 aluminum extrusion stuff only in plastic. I've been up and down the internet and got nothing. (Tubing to be square is crucial, preferably 2”). Thank You William

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