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  1. 13th January 2011, 10:10 AM #1
    19brendan81
    19brendan81 is offline SENIOR MEMBER
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    Default Gear Identification

    OK, so I measured a couple of the gearbox gears on my lathe in order to try and ID them incase the brazed on tooth I did lets go and I need to fab a new gear. The measurements I came up with are as follows.

    Gear 1 - Diameter 54mm, 32 tooth, tooth depth approx 3.5mm
    Gear 2 - Diameter 42mm, 24 tooth, tooth depth approx 3.5mm

    The diameter is the absolute diameter, the outermost diam accross the gear...not the pitch diameter.

    Is this enough info to I.D the gears? I had a quick look and thought 1.5 module metric might be close. The lathe iteself is metric, but they also made imperial versions so im not sure what that means for the gears in the gearbox. Most other nuts and threads are metric, but the spindle is imperial.

    Brendan
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  3. 13th January 2011, 11:14 AM #2
    Dave J Guest

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    If it's any help my lathe is imperial but has all metric gears. I will get scans of my book and post them up as they may be the same gears.
    As for working out gears, Pipe Clay is the gear guru on here, he seems to be always making them.

    Dave
  4. 13th January 2011, 12:39 PM #3
    pipeclay
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    You thought may be close but a DP formula seems to be a better source for your OD's.

    Can you measure the Chordal distance on the 32 tooth gear across 4 teeth and then 3 teeth,and with the 24 could you measure across 3 teeth and then 2 teeth.

    When you do your measurements could you either do them in Metric or Imperial but have them to .000 for Metric and .0000 for Imperial if possable.
  5. 13th January 2011, 03:55 PM #4
    19brendan81
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    OK no probs. Whats the chordal distance? Is that the distance between the centre of the teeth?
  6. 13th January 2011, 04:59 PM #5
    pipeclay
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    If you can measure from the Outer edge of 1 tooth to the outer edge of the required tooth/teeth,its a straight line measurement.
  7. 17th January 2011, 09:53 AM #6
    19brendan81
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    OK, I took the measaurements and got the approx values below. The gearbox is all backtogether now so it was a bit fiddly to measure.

    24 Tooth Gear - 3 teeth chordal distance 16.17mm, 2 teeth distance 10.84mm
    32 tooth gear - 4 teeth chordal distance 21.14mm, 3 teeth 15.77mm

    Cant go any more precise than that as my verniers only go to .00

    Cheers,

    Brendan
  8. 18th January 2011, 08:41 PM #7
    pipeclay
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    From what I can find I would think they are very similar to,if not 16DP 14 1/2 PA gears.
  9. 19th January 2011, 09:04 AM #8
    19brendan81
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    OK thanks. I was hoping it would be one of the sizes that CTC have..I only had a quick look but it seems that for the price of 1 cutter in this form I could buy a whole set from CTC!
  10. 19th January 2011, 01:24 PM #9
    pipeclay
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    If you wanted to try the CTC cutters the nearest Module would be 1.5,but with my calculations you may not be as close with the 24,the 1.5 M is nearer to the 32.
  11. 20th January 2011, 01:48 PM #10
    19brendan81
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    OK cheers,

    Thanks for your help.
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