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  1. BrianDengel

    why choose one pressure angle versus another

    The standard specifying 14.5 pressure angle gears was discontinued in the early 1970's. As there are thousands of inch pitch gears with this pressure angle in use, numerous stock gear suppliers still manufacture to the old standard. 20 degree gears are the standard throughout Europe and Asia...
  2. BrianDengel

    How to determine a correct pitch diameter of a pulley

    I don't think they have the information on their website, but Stock Drive Products (www.SDP-SI.com) does have a free catalog which contains a 100 page technical section on pulleys.
  3. BrianDengel

    16.5 to 1 ratio for Helical gears?

    If you are working in a parallel axis application, the only thing the 45 deg helix angle will accomplish is to increase the center distance. A lower helix angle will have a better contact ratio and less thrust loading. If this is a crossed axis application, then why not go with worm gearing?
  4. BrianDengel

    Need website info for basic pulley mechanics

    I don't think they have the information on their website, but Stock Drive Products (www.SDP-SI.com) does have a free catalog which contains a 100 page technical section on pulleys.
  5. BrianDengel

    Spiral bevel gearset - preferred direction of rotation

    Shigley is correct. You design your bearings to absorb the loading outward. If the gear are driven in reverse, they will be forced inward and bind. Under low speed, low torque applications, this may not be a prolem, but in high speed, high torque applications, this will overload the gears and...
  6. BrianDengel

    Recommend a material type for gear set.

    Why not use a hard anodize coating on an aluminum gear?
  7. BrianDengel

    Making spare gears from existing: what info is needed?

    When replacing gearing, it is best to replace all of the components together. This way the problems of pressure angle & tooth form can be avoided. In order to reproduce a gear what is need is: the pitch, the number of teeth, the pressure angle, the bore, the hub diameter, the face width and the...
  8. BrianDengel

    What is the definition of a "Pinion Gear"

    The pinion is the smaller of two gears in a gear set. When the gear (pinion) is made up of a small number of teeth (typically less than 14), it is usually manufactured as part of a shaft assembly. The reasoning for this is that a bore in a small gear cause it to be inclined to deform. If the...
  9. BrianDengel

    Coefficient of Profile Shift

    If a profile shift of +0.5 increases the working pitch diameter of an external spur gear, does the same +0.5 shift increase the pitch diameter of an internal gear? Or do you use a -0.5 shift to increase the pitch diameter of an internal gear?
  10. BrianDengel

    High wear on worm & worm wheel

    It appears as though the lubricant is your problem. AGMA recommends an 8A Comp Lubricant for throated worms and an 8 Comp for cylindrical worms.
  11. BrianDengel

    effieciency in spur gears

    Efficiency equals Power out divided by Power in.
  12. BrianDengel

    Drive train effieciency/power loss

    Efficiency is a measure of the percentage of power that travels through a mechanism from its power source to the output. It is power is reduced by shaft misalignments, by heat generation in the gear mesh, lubricant losses in the bearings and any other friction losses. It is also effected by the...
  13. BrianDengel

    where can I buy a pulley to fit a 3/16'' shaft?

    Check out Stock Drive Products (www.SDP-Si.com) They stock over 30,000 pulleys & belts. They can be reached at (516) 328-3300.

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