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  1. 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...
  2. 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...
  3. 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...
  4. 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
  5. 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...
  6. 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
  7. 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
  8. FeldmanWill

    Dry eraser board or coating

    Mechanical engineer here. I need some sort of inexpensive sheet manufacturer or coating for dry erase purpose. Perfection is not an issue but cost is, it's not for classroom just some once in a while labeling labeling. Thanks in advance William
  9. FeldmanWill

    Need a direction

    Mechanical engineer here with no but basic knowledge of rubber products. I need some sort of easy guide of rubber properties and names of some rubber manufactures, as close to the source as possible because cost per quantity will be an issue. I'm particular interested in rubber sheet ~1/8 THK...
  10. FeldmanWill

    Axial Load on Ball Bearing

    I'm looking at this machine and it seams like it was designed to take about 40 lbs axially through a SKF6309 bearing or equivalent (Single Row Deep groove Ball Bearing 100mm OD, 45mm ID, 19mm Width). Machine is arranged vertically instead of horizontally with no bearing modification. Is this...
  11. FeldmanWill

    Search for non existing Electro-Mechanical Component

    I’m currently looking into system design of functionality stated bellow. I’m hitting a brick wall with pneumatics as far as using electrical to convert to pneumatic power which increases cost, number of components etc. I was thinking may be there is an electo-magnetic-mechanical component on...

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