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  • Users: JLKDS
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  1. JLKDS

    Clutch slippage problem

    1) Yes, they said that I should try one of their higher friction coefficient materials, 0.5 or above. They are going to send me a sample. 2) It's a design installation, so it has to look nice Cheers
  2. JLKDS

    Clutch slippage problem

    Hi all, I have been developing a pulley system which allows the user to lift a 50kg weight by turning a wheel. The pulley system has a mechanical advantage of 3 and there is also a 2:1 gear exchange along the line. There is a one way clutch bearing that stops the weight from falling (basically...
  3. JLKDS

    Scissor Lift Mechanism

    Hi guys, I do apologies for the confusion in the diagram, the force at A was meant to be in the opposite direction as this is the counteracting force that will balance the mechanism making it static. I realise the issue regarding mechanical adavantage or should I say disadvantage with making a...
  4. JLKDS

    Scissor Lift Mechanism

    Thanks for your responses guys. jlnsol, wouldn't F start at W when the arms are vertical and then increase to 5W when in the horizontal when A moves up?
  5. JLKDS

    Scissor Lift Mechanism

    Sorry I didn't attach the image correctly. Here is a diagram of the proposed mechanism:
  6. JLKDS

    Scissor Lift Mechanism

    Hello, I am designing a scissor lift mechanism with one arm 3 times the length of the other arms, with the remaining arms being symmetric. The mechanism is loaded at the end of the long arm. I am trying to determine what would be the force acting upwards at point A but it's proving to be a bit...
  7. JLKDS

    Which potentiometer?

    And I agree, I think it uses PWM which I imagine is far more involved for me to replicate than can be done in a day. Anyone have any suggestions? Cheers
  8. JLKDS

    Which potentiometer?

    Hi Skogsgurra, Thank you for your reply. I have found a PDF with the product spec http://www.saxbylighting.com/instructions/40648.pdf
  9. JLKDS

    Which potentiometer?

    In other words, how would this one work? http://www.lightsworld.co.uk/p/Saxby_Microflex_12V_dimmer.htm?affiliate=gbase&gclid=COS_osOTrrUCFabLtAodQFgA8A
  10. JLKDS

    Which potentiometer?

    Hello all, I am trying to find the correct potentiometer to dim LEDs. I am aware that PWM should be used for efficient and linear dimming, but in the name of speed and simplicity I would like to just use a potentiometer. The LEDs will draw a maximum of 90W and are 12V. Will I need a...
  11. JLKDS

    Contact between two parts in SimXpert

    I want to perform FEA on a bracket for a top hung sliding door by modelling the weight of the door as two point loads where the bolts will be. The bracket will then be hanging from an axle (Shown in yellow) that is in turn connected to the wheel, but for simplicity I have been modelling the...
  12. JLKDS

    Gravity in SimXpert

    Hello guys, Having a bit of trouble with gravity on an I-beam section on SimXpert. When using gravity under global LBCs, into 'Acceleration vector scale factor', I enter 9810mm/s^2 as my units are in mm, correct? I have checked my density is also in kg/mm^3 (i.e. 7.85e-6 for mild steel). Yet...
  13. JLKDS

    Continuous Beam Support Loads

    Wait, forget that, found it now. My apologies! Pretty new to SimXpert if you couldn't tell [wink] Pete
  14. JLKDS

    Continuous Beam Support Loads

    Yeah it runs fine when fixed at one end, I guess I didn't understand the difference between fixing and pinning in all three directions but I understand it now. I think you're right that my main problem is the GPF, I've been trying to find how to evaluate it but can't find it. Apparently it's...
  15. JLKDS

    Continuous Beam Support Loads

    I'm sure I have all six motions constrained, yet I still get the same fatal error (9050) in the Nastran f06 file, saying that it is not constrained correctly. I can't find what is wrong with my model nor can I figure out what I'm missing. Here is the model at present: Can anyone see anything...
  16. JLKDS

    Continuous Beam Support Loads

    Thanks for your reply rb1957 Using one point which is fully fixed allowed the calculation to run, I can see deformation and bending stress results but not loads. If I just have the beam constrained in the vertical, Nastran won't run and In get this message in the log: USER FATAL MESSAGE...
  17. JLKDS

    Continuous Beam Support Loads

    Hello all, I am trying to calculate the support loads on a 10m I-beam that will be fixed at 1m intervals. There are 4 point loads representing trolleys but I will not be treating them as live loads at this point. I am using SimXpert 2012 to try and model the beam by meshing a straight curve and...

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