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  1. Windward

    PTFE (Teflon) bearings

    Zeusfaber, thanks for mentioning Orkot. I didn't know about it, might have a use for it. I found a good article on how the cutless bearing got its name: "...The rubber bearing had, in fact, 'cut less' into the shaft surface than the hardwood bearings..."...
  2. Windward

    PTFE (Teflon) bearings

    Just found another use for lignum vitae. Clocks. The wood is both hard and oily, so it is a fine material for clockworks. No need to lubricate it. Most lubricants start to gum up as they age, which slows the clock down. In the early 1700's, John Harrison used lignum vitae to make clocks...
  3. Windward

    PTFE (Teflon) bearings

    Sorry I can't help the OP, but I want to respond to some comments. For a long time, lignum vitae was the only material we had for shaft bearings in ships. It might have been used for rudder bearings also. These bearings were on the part of the shaft that met the water, where it penetrated the...
  4. Windward

    Things are Starting to Warm/Heat Up Part IV

    I count seven commenters here so far. Three of them post the most, and the OP posts the most by far. I think this ratio is probably true for the earlier threads on this topic. That rule applies to the population of the planet. Very few of us care enough about the growing catastrophe to even...
  5. Windward

    Things are Starting to Warm/Heat Up Part IV

    The operators of Hoover Dam have reduced the power output because Lake Mead is shrinking. Hoover Dam is in the Black Canyon. When they built the dam, the canyon was "hell hot." No doubt it is hotter now. In the link below, Norton and Huddleston explain how to modify a hydroelectric plant to...
  6. Windward

    Things are Starting to Warm Up Part III

    Well, Hokie66, Capt. Briggs took the long way around to circumnavigate Virginia, but that was the only way. He sailed up the coast from Norfolk to the St. Lawrence River, up the St. Lawrence and through the Great Lakes to Chicago, down the Sanitary Canal and the Illinois River to the...
  7. Windward

    Things are Starting to Warm Up Part III

    Hokie66 says he "never heard of a tugboat relying on wind." "The late Capt. Lane Briggs ' Tugatine is a favorite flagship for sail-assisted working vessels and is credited with a 1984 circumnavigation of Virginia...It's the world's only purpose-built sailing tugboat and uses its sails to save...
  8. Windward

    champagne effect in water-compensated CAES

    Hydrostor is starting to get a lot of action with their water-compensated CAES plant: https://www.energy-storage.news/goldman-sachs-invests-us250-million-in-long-duration-energy-storage-provider-hydrostor/ The champagne effect can be a serious problem in these plants...
  9. Windward

    Planetary Gear Help!

    Another consideration for the planetary design is that external loads can increase the load imbalance of the planets and reduce the life of the gearbox. It would be difficult and expensive, maybe impossible, to straddle mount the input and output shafts of a planetary gearbox. Straddle...
  10. Windward

    Planetary Gear Help!

    "...I am planning on having 4 planet gears..." With more than three planet gears, the arrangement is statically indeterminate and load predictions are unreliable. It is about load sharing between the planets. It is never perfect in a planetary gearbox for at least three reasons: manufacturing...
  11. Windward

    elec power plant component mfr's are going kaput- lost expertise + knowledge

    Roughly half of the voters in the good old US of A believe it is their patriotic duty to make the rich richer no matter what. They have been succeeding to the max since the elections of 1980. Now many of them are posting here, complaining of their success. What did they expect? Sending all...
  12. Windward

    Lifting Chain Idler Pulley Design

    I happened to find this standard, maybe it has a reference to pulley design. Might be worth the $42 in this case: ANSI/ASME B29.24-2002 Roller Load Chains For Overhead Hoists This Standard covers specialized roller chains that are designed specifically as load chains for use in overhead...
  13. Windward

    Lifting Chain Idler Pulley Design

    I don't know why I didn't think of this before. Mark's Mechanical Engineering Handbook and Machinery's Handbook have good information on this subject. Why not consult with manufacturers of this equipment? Here is just one result from a search: http://www.jherbertcorp.com/MHD56012_ed8.pdf I...
  14. Windward

    Lifting Chain Idler Pulley Design

    The Westinghouse code formula would give you the minimum diameter for the link bar stock assuming only bending stress. It accounts for fatigue. Add the tensile stress from the load. Then you should have a good idea of what a given chain can handle. Might be good to make a Mohr's circle for...
  15. Windward

    Gears and Pulleys for dummies

    If this manual doesn't cover it, it's not worth covering. It is excellent: https://www.purvisindustries.com/ASSETS/DOCUMENTS/ITEMS/EN/Martin_B1015-4_Catalog.pdf
  16. Windward

    Gears and Pulleys for dummies

    Many gear and sprocket companies provide this information for free. Some of these handbooks are excellent. Here is a good one: https://www.biwinc.net/files/2015/07/SPROCKET-ENGINEERING-DATA-2.pdf I have found several others over the years. Some that come to mind right now: Browning Martin...
  17. Windward

    Ratchet and Pawl reference standard

    The Mechanisms and Mechanical Devices Sourcebook, Neal Sclater Editor, has one good page on design of ratchets. Earlier editions of this book are free on the internet, but probably not authorized. The latest edition is the Fifth, 2011. The earlier versions have the same page for ratchet...
  18. Windward

    Abandon the direct drive wind turbine

    PNachtwey, I thank you for your post. It is interesting. Partly wrong and partly promising, with an attitude. For what is wrong, see your first sentence. The ENTIRE difference in my proposal is that I am using a CVT in the wind turbine. Only DeWind has done this before with any success, and...
  19. Windward

    Abandon the direct drive wind turbine

    Good question. Since I did not ask any questions, why did I post this stuff? One reason is legal. I wanted it in the public record so that others could not claim it. There is a chance of that. Another reason is that I think it is valuable information. It is the result of many years of...
  20. Windward

    Abandon the direct drive wind turbine

    I see that a post can contain only one upload. Here is the paper on the hydraulic system, with reference to the figures uploaded in the preceding post.https://files.engineering.com/getfile.aspx?folder=35a16016-f091-48b4-a443-05e68ad40714&file=CVT_Analysis_Rev_1.docx

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