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# Helical Gear. Base Tangent Length

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## Helical Gear. Base Tangent Length

(OP)
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 I have come is:
kth =zK (f ,β)+0.5

the only part of which I recognize is the helix angle.

Anyone help?

Colin

### RE: Helical Gear. Base Tangent Length

Don't know what your time is worth, or maybe you're doing this just to learn more about gear inspection, but for \$99(US) you can download a spreadsheet that performs the calculations you require.

### RE: Helical Gear. Base Tangent Length

(OP)
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!!

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