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  1. davidh729

    Cracks post crimping for Plexiglass V825 molded parts

    Acrylic (PMMA) has a tendency to craze, which is probably what you're seeing. This is usually caused by an applied stress or a combination of an applied and/or residual stress and some other factor like UV or chemical exposure. With enough residual stress you could probably see crazing just from...
  2. davidh729

    DIN 5480 Root and Tip diameter tolerances

    Thanks Spigor. This makes sense now. The word recommended in 5480-1 Table 5 apparently didn't register and I was confused by the term deviation over tolerance. Dave Hyman Mechanical Engineer
  3. davidh729

    Rigid Link Loading in Creo Simulate

    I think you want to create a datum point where the load is acting and then create a rigid link between the point and the 4 holes. This will transfer the load to all 4 points. If you need the displacement of the load point you will have to create a measure. The graphical output will not show...
  4. davidh729

    DIN 5480 Root and Tip diameter tolerances

    I am working on a mating part to a customers product. They are using a male DIN 5480 spline that we have to interface to. What I have to reference is a competitor's drawing that calls out the hub spline as an N50x0.8x30x60xH9. We purchased the current (2006) version of parts 1 and 2 that seem to...
  5. davidh729

    Sketching Section View-Best Practice?

    Look into the "copy geometry" feature. This will let you bring the surface you're interfacing to into the part and use it for reference. I don't use this much and haven't used WF3 yet so I can't give you specifics. Dave Hyman Mechanical Engineer
  6. davidh729

    How to calculate an interference fit over a large temperature range

    Unless you have a situation where coefficient of friction depends on temperature the interference vs. load capacity of the press will not depend on temperature. So the interference required doesn't change. What does change is the actual interference. If we assume the original poster's design...
  7. davidh729

    Weld nuts without projections, larger than 5/8

    How many do you need? If it's a relatively high qty say 1000, you could have a screw machine compnay make exactly what you want for not much more than the standards. Dave Hyman Mechanical Engineer
  8. davidh729

    Quality SS MIM in China

    I would suggest finding a supplier that is not based in the far east, but does manufacturing there. The quoted cost of the part may be higher, but they'll already have the resources in place to ensure that you'll get the proper quality. Dave Hyman Mechanical Engineer
  9. davidh729

    ANSI B92.1-1996 Cancelled?

    I'm not so much looking for the standard (B92.1), I can get a copy of it. I'm more looking for info on why it is shown as cancelled on ILI's site and is not superceded by anything. If it is truly cancelled is there something that would be better to design to? My gear vendor pointed me to 92.1...
  10. davidh729

    ANSI B92.1-1996 Cancelled?

    I went to ili-info to buy the B92.1-96 and it is listed as cancelled and has no information on what superceded it. Anyone have any info on why this is? Is there something else that would be better to design to? My gear vendor recommended designing to this and specificaly not to design to B92.2M...
  11. davidh729

    Li-Ion Help Please

    I can at least answer questions 3 and 4. Li-ion batteries last longest when not fully discharged. Your best bet is to rotate the 2 batteries for the camcorder. Use 1 until it has about 25% life left then switch to the other. Dave Hyman Mechanical Engineer
  12. davidh729

    Pro/E WF v. SWx for college setting: anyone for Pro/E?

    I learned Pro/E in college and I had no problem picking up SWx in about a day, but that was on 2000i2 and 2001. With Wildfire's new interface and more lax attitude toward fully constraining things, I think it's more importatnt that people get a good understanding of CAD best practices then learn...
  13. davidh729

    Pro-E Slinky Model with motion

    There may be a way to simulate it with mechanism dynamics. You may be able to drive flexible dimensions with the spring components. Don't know if this would work, but it might be worth a try. The only time I've seen something like a slinky simulated is with an FEA package with an explicit...
  14. davidh729

    Step down motor

    Phiah, 8200Nm@62RPM is 53.2kW. paulliu is right about the gear ratio to get the proper speed but it will only yield 6930Nm. And this doesn't include the efficiency of a 2 stage gear box that you'll need to use to get there which could be as low as 80%. Sounds like you should get a good machine...
  15. davidh729

    Backlash/Center distance

    Not 100% sure on thhis but I think the tan comes from the equation of the involute. As the gears are seperated the tooth thins out. I think you're visualization only works if the teeth have no thickness. Dave Hyman iRobot Corp www.irobot.com
  16. davidh729

    Sharing the load- friction and dowel pins

    Can you design the joint to react all of the load with the pins and just hole the poieces in place with a coiuple of bolts? Dave Hyman iRobot Corp www.irobot.com
  17. davidh729

    Casting of wedge wire profile

    From the research I've done on metal injection molding your qty's seem to be where the domestic operations will start looking at it. You may want to look at philipsplastics.com, they do metal injection molding. Dave Hyman iRobot Corp www.irobot.com
  18. davidh729

    creating PDF's in Pro/E

    The integration between WF2 and Acrobat is really good I use it daily, but there is also a free command line utility ps2pdf to convert postscript files to pdf's look at www.ghostscript.com Dave Hyman iRobot Corp www.irobot.com
  19. davidh729

    Interpreting Mechanica Results

    I've generated a reaction force graph from an analysis and I'm not really sure how to interperet the results. The graph shows distance along the curve on the X axis and Force/length on the Y axis. Is this showing me a distributed load profile where the total load is area under the curve? Thanks...
  20. davidh729

    problem with Mechanica??

    There is a screen in the Pro/Engineer setup called "Product Interoperability Configuration" It has a place for Mechanica. This directory must be correct or Pro/E won't find Pro/Mechanica. You can run loadpoint/bin/ptcsetup.bat loadpoint is teh top level directory of where Pro/E is installed...

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