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Type: Posts; User: Hudson

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    Are they multi-million dollar dies? Years ago,...

    Are they multi-million dollar dies? Years ago, when the earth was thought to be cooling, auto makers used a free machining, low melting alloy called Kirksite for fender dies.

    More recently,...
  2. You have a .002 cylindricity and a roundness call...

    You have a .002 cylindricity and a roundness call out. That seems like double dimensioning to me.

    Could you just call out a .005 cylindricity and a surface finish on the basic shaft diameter and...
  3. Look harder for 1" couplings. They should be...

    Look harder for 1" couplings. They should be less than a dollar for the PVC type.
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    .283 lbs/cubic inch

    .283 lbs/cubic inch
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    If you know the distance from one pivot to...

    If you know the distance from one pivot to another on the links, it is a simple triangle problem:


    With angle theta and the distance from the two base pivot points and the length of the link...
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    Take another look at the Parker catalog (fine...

    Take another look at the Parker catalog (fine folks they are) and see if you haven’t misread the volume as gallons when the actual figure is in liters (57).


    57L is more like 15 gallons or 2...
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    Much simpler to mold is a vortex spiral.

    Much simpler to mold is a vortex spiral.
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    Regarding hydraulics, you cannot compress a...

    Regarding hydraulics, you cannot compress a liquid so your accumulator piston must work against some sort of spring like compressed air or steel. So the real energy storage is in the spring.

    ...
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    Confront the vendor and ask about the change in...

    Confront the vendor and ask about the change in finish.
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    You might look at a stepper motor and ball screw...

    You might look at a stepper motor and ball screw configuration that would be positioned under the table to provide linear force.

    Look for a 400 mm travel length linear stepper motor on Amazon. ...
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    Most mechanism to accomplish this motion will...

    Most mechanism to accomplish this motion will require a gear reduction. Since we don't know the motor speed, friction etc. it is not possible to give you a direct answer.

    You want to move 300...
  12. Look at some existing designs for folding or...

    Look at some existing designs for folding or Pullman berths. Some are ceiling mount - some are wall mount. Also consider getting double duty out of another piece of furniture like a table or a...
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    If you recall, the deflection equation used a...

    If you recall, the deflection equation used a length cubed term. The difference between 42 cubed and 36 cubed is considerable.


    We are now looking for a tube with a section moment of...
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    Increasing the allowable deflection by 2X reduces...

    Increasing the allowable deflection by 2X reduces the moment of inertia required by .


    A 3” square tube with an 1/8” wall has a section moment of inertia of approximately 1.98 inches^4. A...
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    We don’t know quite enough to design a davit for...

    We don’t know quite enough to design a davit for you.


    What we can guess is that that 200 lbf end load can get a lot higher under sea if the dinghy fills with storm water and starts to...
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    117 N/mm2 is a stress level equivalent to 117 MPa...

    117 N/mm2 is a stress level equivalent to 117 MPa or approximately 17,000 psi.



    This rather low stress for a bolt. This might be based on the unusual thermal requirements of a fireproof...
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    Are you attaching this gusset by welding?

    Are you attaching this gusset by welding?
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    Go back and read Kelly's well stated comments on...

    Go back and read Kelly's well stated comments on profitability.
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    Why not use rectangular tubing?

    Why not use rectangular tubing?
  20. Also think about heat treating. Most steel gears...

    Also think about heat treating. Most steel gears are carburized.
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    Ask the sales force of the high priced hydraulic...

    Ask the sales force of the high priced hydraulic fluid to justify the cost. If they don't have good numbers, move on to your next project.
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    You might use two valves in series. The first...

    You might use two valves in series. The first would open a 2psi and the second close at 3.5 psi. You could also combine an electrical with a mechanical valve to handle separate conditions.
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    I attach a segment from "Building Construction...

    I attach a segment from "Building Construction Illustrated" by Francis D. K. Ching (A favorite of mine on the subject) which suggests that cantilevers of 24" or less might not need engineering...
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    Your efforts to calculate the forces and...

    Your efforts to calculate the forces and deflection are commendable however, your should look into any local codes to see if they have a 'span table' that they use for structures that are not...
  25. You have not shown us the part that you are...

    You have not shown us the part that you are checking. Can you make a fixture that has two supports with an indicator between them so that you can place the fixture directly upon the part in the...
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