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Thread: The Bucket Foundry

  1. #4441
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    Quote Originally Posted by lohring View Post
    The plan is to start out with the 1:1 ratio then upshift to the higher ratio during the full power run up to the trap.
    What about a dual cone variable speed drive? Should involve less losses than a conventional CVT, and with a floating prop shaft could provide exactly the same seamless torque driven ratio change.

    Might involve mounting the motor on a pivot, with an adjustable spring to provide the fine tuning.
    Go soothingly on the grease mud, as there lurks the skid demon

  2. #4442
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    Quote Originally Posted by lohring View Post
    Frits, I don't understand the gear selection system in the gear box you posted. Is there a sliding key that engages the gears?
    Yep. Here are two more pics that may help. Drawing by Jan Thiel.
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  3. #4443
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    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  4. #4444
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    More casting stuff.

    Did some basic qualifying cuts on the castings:

    1. Facing in lathe.

    Click image for larger version. 

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ID:	345013 Bit of an explanation here, more one of design rather than casting. The part could have been simply circular, but was designed to have 3 equispaced 120 deg faces, and at the same radius. to ensure concentricity of the key features. Seemed to work.

    2. Milling.

    The 2 projections are parallel to some of the features to be machined in. So, just plonk it in the vice, clock up the central boss, set X & Y and make swarf.
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    3. Into H/T.

    Seeing it is the same hypereutectic material as our pistons and brake discs, will be able to get the H/T done with this batch.
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    More to come....
    "Success is the ability to go from one failure to another with no loss of enthusiasm.

  5. #4445
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    As usual, you all are a great source of ideas. Husa, did that overdrive system use a sliding key selector as well? Ocean1, do you have some links or pictures that illustrate your idea? Ken, I'm doing research. I intend to do my best to carefully copy any good ideas.

    Lohring Miller

  6. #4446
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    Quote Originally Posted by lohring View Post
    Ocean1, do you have some links or pictures that illustrate your idea?

    Lohring Miller
    No, sorry mate. It's really just an observation that the torque required to spin a prop at a given revs is directly related to axial load on the shaft.

    So by allowing a small amount of fore/aft movement in a shaft with a cone mounted immediately fwd of the log you can use that in conjunction with another cone directly mounted on the engine crank to vary the ratio in proportion to the torque.
    Go soothingly on the grease mud, as there lurks the skid demon

  7. #4447
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    I assume this is what he meant


    or this with a smaller length slope

    As anyone who has owned a Ford Courier or Mazda Bounty will attest the for and aft torque movement of these , as the gear box end wears is enough to move the whole gearbox out of gear in 5th. So if the slope was step you could have a reasonable difference in gear ratios.
    my preference is still this
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  8. #4448
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    Cuppla goodies there Husa, I like the cone principles. However, to reduce the necessary friction levels of thrusting a small male roller against another male roller (ie convex to convex drive contact) maybe one could consider a male conical roller within a female cone, offering convex within a concave drive contact). Obviously this will require some change of angle of a simple propshaft arrangement.

    Not too sure what power levels what you are dealing with Lohring ?

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    "Success is the ability to go from one failure to another with no loss of enthusiasm.

  9. #4449
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    Quote Originally Posted by ken seeber View Post
    Cuppla goodies there Husa, I like the cone principles. However, to reduce the necessary friction levels of thrusting a small male roller against another male roller (ie convex to convex drive contact) maybe one could consider a male conical roller within a female cone, offering convex within a concave drive contact). Obviously this will require some change of angle of a simple propshaft arrangement.

    Not too sure what power levels what you are dealing with Lohring ?

    Click image for larger version. 

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    Really like that

    Anyone heard from Flet...........
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  10. #4450
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    Quote Originally Posted by husaberg View Post
    Anyone heard from Flet...........
    He was on Fakebook 3 hours ago.

  11. #4451
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    Our engines develop around 6.5 hp to maybe 8 hp at 16,000 rpm. The torque doesn't get over 3 ft-lb (sorry for the units). The friction drives look interesting. The details of a design might take some thought.

    Lohring Miller

  12. #4452
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    Dangerous times
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  13. #4453
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    Quote Originally Posted by lohring View Post
    Our engines develop around 6.5 hp to maybe 8 hp at 16,000 rpm. The torque doesn't get over 3 ft-lb (sorry for the units). The friction drives look interesting. The details of a design might take some thought.

    Lohring Miller
    Haven't had time to have a good look yet but I remember (from way back) that"toroidal infinitely variable drives" always intrigued me - They seem complicated at first glance but study them for a while and it'll become clear. - well let's just say that I had to study them for a while! - worth a look!

    https://www.greencarcongress.com/201...-torotrak.html

    https://www.youtube.com/watch?v=5jIe...re=emb_rel_end
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  14. #4454
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    Toroidal CVTs are definitely worth a look. They seem to be a simple solution, but I need to figure out how to grind several matching spherical surfaces. There are other CVT designs that could also work. I do like the dual cone ones. I can grind accurate cones more easily, but the torque transmission looks poor. More research!

    Lohring Miller

  15. #4455
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    Quote Originally Posted by lohring View Post
    Toroidal CVTs are definitely worth a look. They seem to be a simple solution, but I need to figure out how to grind several matching spherical surfaces. There are other CVT designs that could also work. I do like the dual cone ones. I can grind accurate cones more easily, but the torque transmission looks poor. More research!

    Lohring Miller
    My bandsaw has a simple male/female cone drive directly mounted on a standard 3Ph 1250rpm 3KW motor. And that's typical of a lot of pre-VFD tech drives for conveyors etc.

    The problem you'll have isn't capacity, it's the rigidity needed to keep the cones accurately aligned, any deviation quickly changes the contact line to a contact point, with corresponding loss of traction.

    Think it's still worth an afternoon messing around with a bench model though, it's got significant advantages in terms of simplicity/benefit ratio. An old single phase motor with a cone of some hard fiber (typically about 20 degrees) mounted on a fwd/aft axis pivot with a spring and a steel male cone mounted on a shaft with some fwd/aft free movement would be instructive. Immediate issues might be prop shaft lateral flex and axial load on a an old fridge motor...
    Go soothingly on the grease mud, as there lurks the skid demon

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