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  1. eg9arh

    how to determine gear width

    This depends on the load you need to transmit. The relationship between transmitted load and face width can be taken as pretty much linear, ie, double the face width, double the load. There are loads of pieces of software out there, but most good ones are quite pricey. If you have AGMA 908-B89...
  2. eg9arh

    Locking Washers

    Spring washers certainly arn't the best device in the world, but they do have there uses. I've found in low load, high vibration enviroments such as on industrial reducers they are highly effective at locking up small dia thereads (not as good on large dia bolts as they work out too easily)
  3. eg9arh

    How are Spur Gear Teeth Made Thicker?

    In order to make one toothe thicker and the other thinner you alter the addendum modification. This is generally done by adding the same amount on one tooth as has been removed from the second. The tip dia will change slightly but noit by a significant amount. Addendum modification can most...
  4. eg9arh

    Max Shear Stress of Bolts

    I dont think your going to have much of a problem, the stress the bolts are under is really low, go up a grade to 5 if you want to be realy safe, but i doubt the bolts are going shear through. Could you not secure a double strap under the compressor as a fail safe?
  5. eg9arh

    Max Shear Stress of Bolts

    to calculate the shear load of the bolt, you simply multiply the dia of the bolt by the length of engagement into the material (be it a housing or a nut). This gives you the area of the thread under load. If a bolt (or screw) is to shear, it will fail across the thread. Just use this area in...
  6. eg9arh

    Where can I find this?

    Have you thought about using tolerance rings instead. There used widley in the automotive industry as a fail safe for a steering coloumn lock. They grip onto the two shafts like a a starflanged nut, but are much more reliable anbd less faffy
  7. eg9arh

    Tubular drive shafts for centrifugal fans

    Not sure if i understand fully, but i if do, my only thoguht would be to machine the bore of the tube so as it was a light press fit onto the journals at both ends, then secure the journals at the set distance to stop it working out. That or machine a keyway into both journals and the shaft but...
  8. eg9arh

    Contact Ratio for helical gears

    I agree with EnglishMuffin whole hearteldy. Most designers would want to keep the ratio around the 2 mark. Axial contact ratio needs to be at least 1 otherwise your dealing with LACR gears (low axial contact ratio) if this does turn out to be the case, try to increase face width or problems can...
  9. eg9arh

    basic spur gears questions

    in anwser to the first part, i think it depends on how much backlash you can handle, as you move the centres apart the backlash will incerease, upto about 0.3mm this shouldn't be a problem, but the gears will become noisier and pitting resistance will have a greater effect on the gear pair. The...
  10. eg9arh

    AGMA based spreadsheet

    I'm currently trying to prepare an AGMA spreadsheet for creating a gear pair which will fill certain criteria, namely speed and power transmitted. In order to this i need to have the bending/pitting resistance equations from AGMA in the spreadsheet. To say the standard for calculating the...

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