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Thread: Hand Ergometer

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  1. 28-06-2013 #17
    irving2008's Avatar
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    Quote Originally Posted by FatFreddie View Post
    I just printed some 1mm thick test pieces.

    I loaded the 15 and 30 tooth gears into cambam and generated a profile with the built in generator and it was exactly the same outer and root diameters (just a bit more lateral clearance in the root) so I suspect you're right about the ring gear - unfortunately cambam doesn't do ring gears (I've bumped a thread asking for them).

    Measured OD on the 30t gear is 40.0mm and 21.3mm on the 15t and the tooth tip diameter on the ring gear is 72.7mm and the root diameter is 76.4 (near as I can tell - it's a bit flimsy)
    OD for MOD1.25 = (N+2)*1.25, so 30T = 40mm and 15T = 21.25mm.

    tooth tip dia on ring gear should be (N-2)*MOD = 58 *1.25 = 72.5mm and root dia 78.125mm which is correct on drawing...
    Last edited by irving2008; 28-06-2013 at 03:06 PM.
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