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Showing content with the highest reputation on 02/04/2019 in all areas

  1. 2 points
    Remember that sealed bearings come in a variety of types - just with steel shields, with steel-encased felt seals, with moulded rubber seals - in contact and non-contact style - and seals made from molded Viton, glass-reinforced PTFE and Teflon. Each type is designed for a specific use or position, or temperature range, or specific contaminants that it needs to cope with. The tighter the seal lip, the more drag on the rotating component. Some small bearings designed for high speeds need a non-contact seal to keep drag to a minimum. When replacing sealed bearings, always ensure you acquire the correct type of sealed bearing for your application. Wheel bearings can also suffer from "brinelling" - the indentation of bearing rollers or balls, or races, caused by heavy or repeated impacts when the bearing sits in the same position without moving. Further to that, you can have "true" brinelling, and "false" brinelling. If you drop a bearing from chest height onto a concrete floor, you have probably incurred "true" brinelling of the bearing. This is shown as indentation marks in the rollers, balls or races, where they were severely impacted in the one spot. New vehicles transported by rail or truck used to commonly suffer from wheel bearing "false" brinelling, particularly in the 1930's and 1940's as transport speeds increased. The "false" brinelling was caused by rough road surfaces, heavy springs with poor compliancy, and transported vehicles rocking back and forth slightly whilst in transit. Heavy vibrations from rail tracks and train diesel engines caused the problems in rail transport. The "false" brinelling led to noisy bearings in new vehicles, with accompanying shorter lifespan. It caused consternation amongst vehicle manufacturers before WW2, and GM even commissioned a study into the problem. The problem was reduced by improved greases with anti-brinelling properties, tighter tie-downs of equipment and vehicles being shipped, better (more compliant) springing in transport equipment, and better road and rail surfaces. Continuously-welded rails were a big improvement in reducing "false" brinelling in rail transport - and smoother roads with improved paving systems played their part in road transport. Regardless, the problem of "false" brinelling still appears occasionally, usually due to poor transportation techniques, extremely rough remote roads, and wheel bearing grease becoming degraded with age and high kms. A brinelled bearing exhibits excessive noise and roughness when in operation, and is warning you it needs replacement, sooner rather than later.
  2. 2 points
    Open windows on hot days and passenger girls in mini skirts. I could go back.
  3. 1 point
    Nooo. They're usually full of water..... 😂😂😂
  4. 1 point
    If you watch the YouTube videos on heavy equipment accidents the first reaction might be that these Chinese and Asian operators are fools. But they are getting things done like we used to do 50 years ago. Putting diggers on the sides of mountains, trying to drive dozers through flooded ravines. Some them get killed, but we all gotta die somehow. Meanwhile they build a freeway in a few months that takes us five or ten years.
  5. 1 point
    Ambulances crash at a much higher rate than passenger vehicles, its just the nature of being alive everything has risk
  6. 1 point
    My MATCO wheel bearings are non-adjustable, factory sealed. About $6.00 each from the local brg shop..... punch them out, punch them in.... too easy maintenance.
  7. 1 point
    How about having a motor in every wheel of road vehicles. No silly drive train to fail .Electro regenerative brakes brakes on each wheel. Motors can be lighter than a "conventional" brake disc set up. Nev
  8. 1 point
    I enjoy watching the videos from Gyrocopter Girl too , but I’ll be honest . I’m not interested in the aviation content . I can get that elsewhere .😄 😉
  9. 1 point
    I think of it more as "All of this gadgetry STOPS me getting into situations where my skills may be lacking". A situation totally avoided is better than one requiring skills to get out of (whether you have them or not) ? Burning your ass on a hot vinyl seat in shorts.....
  10. 1 point
    I hope my reply is not out of place on this thread! David, It`s not cheesy to me! A few months ago I took a lady flying who was the wife of a guy (a friend of mine) who I taught to fly the Drifter, many years ago. Because of her fear of flying she refused to ever fly with him. Two years ago her husband passed away and she regretted never having flown with him so she came up here from Buderim where they had moved to and stayed with Fran and I. She had come here so that I would take her flying,in memory of her husband,Neil. We went flying and it was a powerful experience for both of us!I had tears in my eyes and could almost feel Neils presence. Do it and I certainly will also! Frank.
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