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  1. insideman

    Pitch vs.radius of shrouded propeller

    Most helicopter rotors are constant angle. Propeller pitch is usually increasing toward the tip.
  2. insideman

    Snap Fit Designs for Plastic Injection Molding

    My experience with crush pins has been dismal! Go with a proper snap every time.
  3. insideman

    One inch styrene tube

    Thanks for the source. Problem is Their minimums and handling fess are GROSS. I need sixteen inches of this stuff. I can't spend seventy plus dollars plus shipping...
  4. insideman

    One inch styrene tube

    Where can I buy a small quantity of one inch HIPS tube?
  5. insideman

    Press fit with Two Plastic Parts

    Many errors here: 1. Heavy section at base of stud and around hole. Revise to constant wall. 2. .004 interferance out of .09375 is too much. 3. 3 degrees is way too much. Consider 1/2 degree. 4.Fits like this will invariably fail over time due to relaxation. Use solvent bonding instead.
  6. insideman

    Career path - Mechanical/ Aesthetic Design

    Become a toy designer. I did and found it quite rewarding!
  7. insideman

    Semi-tubular rivet specs

    Check which brass is being used. Some are rather brittle.
  8. insideman

    'Invisible' Acrylic Bonding

    Try ethylene dichloride. This is a solvent, not a stickum. All residue evaporates. It is widely used for cementing acrylics.
  9. insideman

    Manufacture an helical auger flight from steel plate

    Everybody has missed a point: A helicoid is not developable! A closely related surface appropriately called a "developable helicoid" exists. The straight line elements are not radial as in the helicoid, but are tangent to the inner cylinder. A real excercise in descriptive geometry. I think...
  10. insideman

    Injection Molded Bicycle Wheels

    I'm gonna write it before anyone else has a chance: Don't reinvent the wheel! There has to be wheels available at low cost, so you need not go through design, mold build, first shots, mold revision etc.....
  11. insideman

    Designing wings for a high performance micro-sub

    Adding to what Greg locock wrote, one reason design for under water is less finicky than design for air is that water is far denser than air, making Reynolds numbers lots bigger.
  12. insideman

    Detailed Work Instructions... Format

    And TEST what you write before turning ir loose!
  13. insideman

    equipment for bagging objects

    The fixture is simple. I spent $2.31 for some wood and used an electric stapler that was on hand. I hacked it on my kitchen table. Took most of a day. Works a dream!
  14. insideman

    equipment for bagging objects

    Its me again. I experienced an epiphany and all the complications vanished, leaving a simple manual fixture. WHEE!
  15. insideman

    equipment for bagging objects

    Thanks again. This is close to what I am designing.
  16. insideman

    equipment for bagging objects

    Gentlemen: Thanks for your replies. But I should have written that the point of this exercise is not to save labor. It is to: ASSURE QUALITY. I want to have all the headers going on straight, no twisted bags, etc. Does this thought change your answers?
  17. insideman

    equipment for bagging objects

    I must find/devise equipment to facilitate putting an object into a plastic bag, add a card header to the bag and neatly staple it. The object is 1" X 2.75" X 9.75", fairly hard rubber. Weighs .3 lb. Bag is .002 polyethylene, 3' wide, 13" tall. The header is .010 card, 3.5 x 4 folded to 3.5 x 2...
  18. insideman

    Where are all of the master tradesman?

    Maste Master? I am here. I outlived all the others. r
  19. insideman

    Miniature fuel pump design help

    The specific speed is wrong for a centfugal. Available power is many times what is needed. A tiny piston pump with a leather or O-ring piston seal should work. Simple and effective!
  20. insideman

    Impeller or screw pump powered by pedaling a bicycle

    The type of pump to use depends heavily on the head that needs to be developed, the flow, and the rpm. In short: Specific Speed. Head and flow depend on what you need, rpm can be adjusted by gear or belt drives. The irregular effort you mention can be smoothed by using a flywheel. My guess is...

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