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  • Users: Owen N
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  1. Owen N

    good lathe tool tip forms for machining an extruded bar.

    I am making a small engine cylinder head on a "Micro" lathe. I am working of a domed recess in the main chamber, which is the squish area of a two-stroke. I found that if I come straight in from the front side, then cut towards the centre, I need zero top rake, a fair bit of front rake, and a...
  2. Owen N

    Terminology for universal drill die plate jig

    I can't find these on Google. What are they sold as? I saw one once on line. they have many hole of different sizes in a hardened steel plate. hole sizes 2mm to 10mm This is handy for making small engine parts. The objective is to simply clamp the plate in place and drill through a hole.
  3. Owen N

    Detail layout for rotor retention-quadcopter.

    The Quadcopter design, without the cyclic pitch control, seems to develop massive bending torques at the rotor head mount, when cruising at speed. (5m rotor) I looked at some helicopter shaft-rotor join detail drawings on Pinterest, and they seem much lighter built. Has anyone seen drawings for...
  4. Owen N

    Choose gearbox to direct-mount a quad-coptor rotor.

    Aviation-rated reduction gearboxes 10:1 55 kw prop mounting. I need to find an appropriate company that does this. I found a good one for motors and controllers, but they don't do gearmotors. I suspect industrial gearbox makers don't want their products used for this. There is about 6 kN pull...
  5. Owen N

    Hello, I am looking for enhanced search ability for specialist alternator suppliers

    This question seems to be forbidden on most other forums. I cannot get any sense out of Google. please help! High speed, high power alternators don't seem to come up. I don't know why, they are used on micro-turbine gen sets, so someone must make them???
  6. Owen N

    flat strip spring in wave format for drag spring in annulus.

    I am looking for design info for an annulus spring to act as a friction drag between the inner and outer shell. Radius is 21mm, torque wanted is 0.7 N-m initially. width is 3.5 mm , annulus height is 2mm. By initial fit estimates cof as 0.05, grease packed. Net force = 700 N, drag force = 35 N...

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