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  1. okeng

    ROPS test standard ISO 3471

    thread193-331582 Can we revive this question about interpretation of ISO 3471 ROPS test standard?
  2. okeng

    ROPS tubing A500 Grade C

    thread330-173847 This question was never answered. Anyone on this forum have any guidance on ROPS material requirements, and the interpretation of ISO 3471?
  3. okeng

    ROPS material in ISO 3471

    This has been brought up before on eng-tips, but nobody really answered it. The requirement in ISO 3471 has a table of Charpy v-notch tests that are required on the material, but it's vague about which test is required. There are two columns for temps, and a variety of test article sizes, but...
  4. okeng

    Timing Belt Pulleys in larger sizes

    I need to get about a 20:1 reduction in a timing belt drive. I've tentatively picked out the Gates HTD belt in 5mm pitch, and am building a rough prototype to test out some concepts for a customer. For the testbed, we are going to use 2 or 3 stages of belt drive so we can use simple, cheap...
  5. okeng

    Variable Volume Reservoirs

    I think this type of reservoir is common in aircraft. I know that there was one in the F-16, although my memory is getting pretty dim of that job. I do remember that it used hydraulic pressure on a very small piston that was connected to the big piston to pressurized the reservoir (it was...
  6. okeng

    Stabilizer Legs or Jacks -- supplier?

    I'm looking for recommendations (positive or negative) for a supplier of hydraulic stabilizer legs or stabilizer jacks. We have made them in-house for various applications, but would love to find a good source and quit rolling our own. Most of the projects I've run into where we need these are...
  7. okeng

    Heavy machinery design text book

    JStephen's suggestion of Spotts' "Machine Design" is also excellent. My copy of that is pretty dog-eared. I used to work with a guy who made it a habit to write down his knowledge. When he figured out the best way to do something, he condensed it down to one or two concise sheets, with...
  8. okeng

    Platen Design

    Design Rule #1: Slideth not thy parts; rather let them rotateth, that it might go well with you and your children. Seriously, unless it's really important for the two surfaces to move linearly, making things that pivot is generally more robust, simple, and reliable than making things that...
  9. okeng

    Heavy machinery design text book

    1. Engineering Creativity by T.F. Hanson is an excellent book on design in general--very practical stuff. I've given away a bunch of those books. 2. Designing Cost-Efficient Mechanisms by Lawrence J. Kamm. Also very general, but surprisingly helpful. 3. Engineer to Win by Carroll Smith...
  10. okeng

    Track Shoe Design

    I vote for EdDanzer's idea--your company probably already has 20 types of mining bits from Kennametal and Sandvik, and already has welders that are accustomed to welding the holders onto cutter heads. I can vouch for the traction you can get, based on an attempt to run a cutter head the wrong...
  11. okeng

    coping structural members

    GirlGeek, This isn't really pertinent to your SW question, but just generally on forming the ends of beams and channels for skids. One of my customers and I worked out a really slick way to do this by making a plate part that's bent into a tapered channel. The beam itself is just cut off...
  12. okeng

    Steel Channel with 90¦ internal walls, for rollers.

    Thanks much for that. They also listed a line of inline ball-joints. I've searched for those to use on double-ended steering cylinders. Don't have an application at the moment, but now I know where to go! Thanks again. Jess davisprecisiondesign.com
  13. okeng

    Steel Channel with 90¦ internal walls, for rollers.

    Glad that helped. Who are you getting the bearings from? The project I was doing was very low volume, so it's not worth a lot of hassle to source them, but might be good to have a low$ source in the future. Maybe some customer will want to go in the mast business. Thanks, Jess...
  14. okeng

    Need source for coolant hose elbows

    Tomwalz, Good idea--I thought they just made air intake elbows. I've emailed them to ask about coolant stuff. Diskullman, I've seen those at my local parts store, but they only make them for pretty small hose, like heater hoses. They are really slick, and I'm hoping to find a place to use...
  15. okeng

    Need source for coolant hose elbows

    I design various kinds of engine-powered machinery, and one component I've been searching for is coolant hose elbows. What I'd like to find is someplace that has a catalog of standard 90 degree and 45 degree formed rubber elbows. The sizes we usually deal with are 1.50 through 3". What we...
  16. okeng

    DWG to DWG

    I've got one called CadWizz that works very well for that purpose. It's free from Amethyst. I think the free one has a file size limit or # of uses limit. I bought the full version for $40 or so and it has become my default Acad file viewer/printer. Jess
  17. okeng

    Steel Channel with 90¦ internal walls, for rollers.

    I think what you need is called "mast rail channel" and, like you said, it is made for forklift mast rails. Most mast mfgs seem to have their own captive tooling and aren't in the business of selling channel. We finally found a steel mill that was tooled up for it, stocked it, and was...
  18. okeng

    Why not a 4 Cyl diesel in a light truck

    Pat, that's a great lead--I didn't know there were so many of those vans on the market. When you say it hauls your 4x4 without fuss, do you mean it goes 75mph or 55 mph? As I remember it, the 125 hp was the setup we looked at for a loader design--usually pretty close to the continuous...
  19. okeng

    Why not a 4 Cyl diesel in a light truck

    I do really like the 3.9 Cummins. We used them at my former place of employment in just about everything we manufactured, including things that didn't really need the horsepower--it was just such an economical engine in the quantities we were buying that we could put 80 hp into a machine that...
  20. okeng

    mounting of 3-cylinder engine

    The application is in a small self propelled sweeper. Vibration is an issue because of the problems with the previous 3-cylinder installation--they have had lots of vibration-related failures of bolted joints, exhaust systems, etc. It's not important to have a luxury-car quality of...

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