Helical Gear. Base Tangent Length 1

colbtech · Jun 5, 2015

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

gearcutter · Jun 5, 2015

A quick 10 second search on Google ("base tangent length" equations) yields this link, pages 159-160 -

https://books.google.com.au/books?i...age&q="base tangent length" equations&f=false

tbuelna · Jun 5, 2015

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.

Occupant · Jun 7, 2015

I think, you overlooked a few things. -->

colbtech · Jun 8, 2015

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!!

Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Helical Gear. Base Tangent Length 1

colbtech

Agricultural

gearcutter

Industrial

tbuelna

Aerospace

Occupant

Mechanical

colbtech

Agricultural

Similar threads

Part and Inventory Search

Sponsor