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  1. colbtech

    Helical Gear. Base Tangent Length

    Many thanks all. The last file did the trick, although I had located the same formula on a Chinese website. Just didn't translate it!!
  2. colbtech

    Helical Gear. Base Tangent Length

    Hi folks, I am trying to write a spreadsheet for calculating the Base Tangent Length. (Wk = mn.Cos(αn)[(k-0.5)π+z(inv(at))+2mn x sin(an)) Rather than use a table for k (number of teeth) I want to be able to write it into the spreadsheet. I am struggling to find a formula for this. The closest...
  3. colbtech

    Steel grades

    Morning all, I would like to purchase gears from En36 steel. Various companies have quoted these steels, stating that these are equivalents. SAE8620 12CrNi13 20CRMNTI Can anyone advise: 1. Are they an equivalent? 2. What the differences in chemical composition mean in terms of using these...

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