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  1. John2004

    Request for info on walk-in freezer door hinge (link for video included)

    Thanks for the info. I was just curious why the hinge would be designed this way. I guess this is a way of making sure the bottom of the door seals when it is closed, and does not drag or wear as it is being opened.
  2. John2004

    Request for info on walk-in freezer door hinge (link for video included)

    Hi everyone, I have a question about the door hinges on a large walk-in freezer used to store product for the frozen section of a large Grocery store. I noticed that when opening the freezer door, the entire door moves up about 3/4 to 1 inch or so. The hinges are designed with a helix /...
  3. John2004

    The Lever Paradox

    Thanks for the link unclesyd. At the link below, which I got from the wiki page you provided, it shows a gear-balance that behaves like the Roberval balance. http://www.lhup.edu/~dsimanek/museum/roberval.htm
  4. John2004

    The Lever Paradox

    I think another way to state what is going on is that the ends of the horizontal loading platforms are rigidly fixed to the vertical beams that are located at each end of the two pivotal horizontal beams. In order for the transmission of torque to take place from one loading platform to the...
  5. John2004

    The Lever Paradox

    Thanks for all the feedback guys, all clear now. I think handleman cut right to the chase. The weight platforms stay horizontal and are moving linearly not arcing, so torque is not a factor & there is no effective moment arm for balance purposes. If the platforms had an arcing motion it would...
  6. John2004

    The Lever Paradox

    Thanks for your replies as well Ivymike and Compositepro, I did not see them before posting my reply to Ron. The opera browser has this annoying glitch where you have to reload the page before you can see the updates to the page. If you come back and forget to reload, you don't see the updates.
  7. John2004

    The Lever Paradox

    Hi Ron, thanks for your reply. Your explanation seems similar to one of the notions I had, it seemed to be a situation where the weight forces were acting more linearly, as if the moment or torque forces of the weights were not coming into play as far as balance is concerned, as they would on...
  8. John2004

    The Lever Paradox

    I ran across this thing called the "lever paradox" on page 19 of the book "1800 Mechanical Movements" by Gardner D. Hiscox. I think the same lever mechanism is shown in Gardner's other books on mechanical movements, some of which can be downloaded free via google's book search function. I...
  9. John2004

    Questions regarding reuse of leaf spring suspension U-bolts

    Thanks for the bolt stress calculator link rmw. There is just one thing on the calculator I'm not quite sure of. I have data for nut factor (k), but regarding the "bolt torque factor" (q), is that generally left at the default 0.5 setting for most calculations ? Thanks John
  10. John2004

    Questions regarding reuse of leaf spring suspension U-bolts

    Thanks for the bolt-science link Desertfox, that was an interesting little article. A guy from the GM power-train fastener lab is one of the best sources of info on the subject I can think of. John
  11. John2004

    Questions regarding reuse of leaf spring suspension U-bolts

    RMW,thanks for the additional info on the heat / tension method and effects of ambient temperature on fasteners. John
  12. John2004

    Questions regarding reuse of leaf spring suspension U-bolts

    Evelrod wrote: "wheel bearings looked like something from a child's toy. Suspension "U" bolts looked more like exhaust system clamps than the rear axle they were used on." I know what you mean, some brake pads on smaller vehicles look like toys, they don't *look* like they could reliably stop...
  13. John2004

    Questions regarding reuse of leaf spring suspension U-bolts

    Hi rmw, thanks for your thoughts. That was basically my feeling as well, if you know the bolt's history, there are no common-sense visible indications of something being wrong, and the nuts can be run down on the bolt's reasonably easily by hand, then it seems to me you can most likely reuse...
  14. John2004

    Questions regarding reuse of leaf spring suspension U-bolts

    Hi everyone, I would like to ask some questions and start a discussion related to U-bolts used to clamp leaf spring stacks on the suspensions of vehicles such as small to full size pickups, jeeps, and larger work trucks. Generally, most after-market U-bolt manufacturers recommend to never...
  15. John2004

    Automotive differential video tutorial from the 1930's (GM produced)

    I stumbled across this GM produced auto-differential video tutorial online, and I thought it was kind of interesting. It's a "Jam Handy" production, who I think produced other videos of this type. http://www.youtube.com/watch?v=K4JhruinbWc Aside from my general interest in seeing something...
  16. John2004

    Compression spring design

    There is a free compression and extension spring design calculator at the following link that may be helpful to you... http://wwweng.uwyo.edu/commend/
  17. John2004

    Questions regarding color problem in AutoCAD Mechanical 2007

    Thanks for the additional feedback Todd, The files are about 9 MB and it does happen to more than one file. I think it must be some setting I am missing, or possibly something to do with layers and/or layer settings. I also have the feeling that when adding or subtracting from solids, if I had...
  18. John2004

    Questions regarding color problem in AutoCAD Mechanical 2007

    Hi Tcarpenter1, Thanks for your reply. Yes, I am taking about 3D solids, AKA 3D solid models. Actually, I never changed the individual "face colors" I only changed the color of the entire solid model. I can change the color of the entire solid model part to red, save the drawing, reopen the...
  19. John2004

    Questions regarding color problem in AutoCAD Mechanical 2007

    Hi everyone, In AutoCAD Mechanical 2007 I'm having a problem with colors. When I change the color of a 3D solid model part within an assembly, save the drawing, then open the drawing again, the part seems to revert back to previous colors that were used during the design process. Sometimes, a...
  20. John2004

    #12 screws

    www.mcmaster.com has 12-24 machine screws in 18-8 stainless, and in brass & zinc plates steel.

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