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  1. shopguy

    D+f on hob

    According to an old gear cutter that I knew, D+f stood for Depth + fillet and was replaced by the designation WD or Whole Depth
  2. shopguy

    fha deviation.

    The fHa is the alignment error of a best straight line drawn from the start of the active profile to the end of the active profile of a charted gear tooth involute. Of itself, it doesn't tell you much unless you take the form variation (ffa) and the required quality of the charted involute into...
  3. shopguy

    Fellows Stub Tooth, 9 teeth on a 10 tooth blank? Help..

    When you cut 9 teeth in a 10 tooth blank, it usually means that you are using an enlarged od pinion to run with a reduced od gear on standard centers. It reduces the amount of undercut in the pinion and makes for a stronger tooth. This is usually done when you have a small number of teeth in...
  4. shopguy

    Looking for specs on Tooth rounding

    OK, so... Several major US tractor producers, some of which are no longer in business, have multiple specs based on the size of the tooth for bullet nose chamfering. A typical format tries to control about half dozen dimensions including: tip of tool to part od (Depth of cutter), the angle from...
  5. shopguy

    Looking for specs on Tooth rounding

    If by "tooth rounding" you are talking about bullet-nose chamfering, I am not aware of any national specification. However, many companies have "in house" specs. It all depends on who the oem of the part is. For the most part, bullet nosing a part is not rocket science...
  6. shopguy

    Need gearing suggestions for winch

    I hope you realize that a 140 Tooth 5 DP spur gear has a 28" pitch diameter. That makes a big housing. Have you considered a double reduction or a worm and worm gear drive?
  7. shopguy

    Worm Drive Center Distance tolerance.

    The backlash is directly affected by the center distance. Don't allow any more center distance tolerance than half the difference between the min and max backlash.
  8. shopguy

    Worm Drive Center Distance tolerance.

    Traditionally, the min. standard backlash allowance in the gear set is .030 / DP. The maximum standard backlash is .050 / DP. This is a rule of thumb that will probably work for your needs. If you need specific backlash requirements because of special operating or loading conditions, there...
  9. shopguy

    high noise level in a parallel shaft speed multiplier

    O.K. I suspect that the reason that you are not getting a lot of responses to this is because gear noises are caused by just about any part of the entire drive assembly. A lot of times, the gears aren't the cause of the problem. Resonance can be a major factor. Sometimes the box itself is...
  10. shopguy

    high speed gears

    It is my understanding that one problem with an oil bath on a high-speed gearbox has to do with the fluid dynamics of the oil. As the gear tooth reaches full engagement with it’s mating space, the only place for the oil to exit is out the sides at the root. What may amount to an urban...

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