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  1. logoslarry

    Kids building things.

    Lots of sources out there. For instance, Lee Valley's reprint of the Boy Mechanic series or the PM Shopnotes. Dan Beard's Shelters, Shacks and Shanties or Boats and Boatbuilding are also good. Or they could simply Google them. Another is Instructables .com, lots of projects of all types. For...
  2. logoslarry

    Homemade jet/venturi pump

    Yeehaw. Used the jet pump the other night, sewer backing up. Cleared it in about ten minutes, could actually watch the level dropping.It's fun to make something that works.
  3. logoslarry

    Homemade jet/venturi pump

    Hey all, Did some experimenting the other day. Changed suction diameter to 1 1/2 " using air no real change in flow. Hooked up to 1000psi water line emptied 5gl bucket in 5 seconds max, so 60 gpm. Quite satisfied with that. Boss won't let me try steam,dang it. Here's a properly designed one...
  4. logoslarry

    Homemade jet/venturi pump

    Hey zdas, Yup, had one for years,some years back. Aaah, the memories, best dang bed I've ever had. Mine took somewhere around 1 to 2 hours to empty, probably because I had to run about 20 ft of 1/2" hose both ways to the bathroom. Size that eductor up 3 or 4 times would probably be perfect for...
  5. logoslarry

    Homemade jet/venturi pump

    Hey Compositepro, Thanks for the comments. I am aware of the design criteria for a proper venturi, unfortunately we don't have the tooling or capability to make one,nor the budget to buy. Wish we did, but it is a poultry processing plant after all. The MBAs running the place think they save...
  6. logoslarry

    Homemade jet/venturi pump

    Interesting. I was thinking that the pressure drop at the nozzle exit would be higher with higher pressure upstream of the nozzle. I guess I'll have to dig out some of my old texts. Here we go, O'Rourke, "General Engineering Handbook" 1940 pg 813. To paraphrase, ejector usually uses a small...
  7. logoslarry

    Homemade jet/venturi pump

    Hey guys and or gals, I had thought of using steam but the air was more easily available. May do it yet if I can talk my boss around to putting in the connections. The original idea came from the PM Shopnotes 1921 pg 3491,probably find it on Google. Another thing I can try is high pressure...
  8. logoslarry

    Homemade jet/venturi pump

    I made a jet/venturi pump from a 2" T ,1" discharge and 1/2" air inlet through a 1/8 nozzle,air at 120psi. Suction is 2" pipe about 5' long. Problem is that I'm only getting about 3gpm. Would decreasing the diameter of the suction allow for better flow? Or would I do better increasing the...
  9. logoslarry

    suggestions for a practical machine design book

    Gardner D. Hiscox' 1800 Mechanical Movements and Devices is a nice source. Excellent drawings. Available from Algrove Press/Lee Valley.
  10. logoslarry

    Making a Building Layout from an Existing Building

    If you're laying out the positions of machines/equipment, think about access for maintenance/repairs. Good practice, in my opinion, is 3 feet all round with 2 feet minimum. If it is at all possible, hard points above anything heavy. Makes it much simpler to remove and replace/repair. If not then...
  11. logoslarry

    Hand Pump - odd question

    You might also try checking out a local ship's chandler or yacht supply. Looking for hand bilge pumps which may be suitable.
  12. logoslarry

    Flash Tank, Sparge/Spray Pipe ??????

    Sounds more like a dry pipe to collect steam. Sparger should be below waterline.
  13. logoslarry

    High side to low side and back again

    AHA! Thought so! I've been talking to my boss about it and he can't quite grasp it. Thanks for the ammo. Now if only I could find some sites where they discuss it.
  14. logoslarry

    High side to low side and back again

    Just wondering if it is possible to set up a high side and a low side screw compressor so that either one could be the other. Umm, best clarify a bit. Arrange piping and valves so that if your booster goes down you can switch the high side compressor over to low side. Of course you would also...
  15. logoslarry

    Simple one this

    When I was in the Navy we used an induction heater to expand bearings to fit on shafts. If in a hurry cooled down with a CO2 extinguisher. Not the best way but it does work. When heating gears, shaft couplings etc to remove them take your time and do it slow and easy. Keeping the shaft...
  16. logoslarry

    Air Lift Pumps

    General Engineering Handbook, C.E. O'Rourke editor in chief, about 1940, has a good explanation of the principle. Actually made a small one for a brine mix tank a couple of years ago, out of 2" pipe and some fittings. Worked pretty well until it got down near the air nozzle. Would have installed...
  17. logoslarry

    Is it my misconception or am I wron

    Jlevie: so check out the Operating Engineer's Act at, http://www.tssa.org/ One advantage of what I do is that occasionally I can and am legally required to tell the boss no. Politely of course. As for ethics,http://www.ipe.org/ethics.htm
  18. logoslarry

    Steam Pressure Vs Compressed Air

    A reservoir for pressure does make sense... I suppose, if worse comes to worse, Glassmann could always go back to the pre-electrical system. Someone pumping a bellows. Actually if he has a stream with sufficient head or steady wind he could set up a mill expressly for that purpose. But I don't...
  19. logoslarry

    Seeking a cast iron reparation method without welding

    Try, http://www.devcon.com/. I've had some good results with Devcon products in the past. But depending on the loading of your part you may just have to bite the bullet and weld. If you're lucky you may be able to build up the area, with one of the "liquid metals", and then machine to...
  20. logoslarry

    Oil + Air Vacuum Pump

    Could you use a venturi? You've got airflow/pressure, but is it enough for an eductor to work?

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