Plant Operations/Maintenance/helical gear


Good Day,
How to check HELICAL gear tooth contact pattern?
Which contact should be considered good and which are bad?
Best Regards

Helical gear tooth contact can be checked by bluing the surface of the teeth of one of the geaars in mesh. Turning the shaft in the proper direction and inspecting the transfer pattern from the blued gear to the non-blued gear. On most drives 70% central contact pattern will work well.
A good reference site is for more information about helical gears is

Hope this helps. Sincerely Mike Biro

Plant Operations/Maintenance

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Mike Biro


I can answer any questions on Mechanical technology. Rigging, shop practices, Hydraulics, Pnuematics,Gears, bearings, belts, fasteners, Safety, Machine tools. Anything within the scope of the Millwright Apprenticeship. All areas of plant maintenance.


30yrs plant experience light packaging, heavy industrial( Steel and Auto). Taught the entire Millwright course for over 12yrs at three provincial colleges. Published the Study tool titled Millwright Exam Questions available from 2007-2009. Personally helped over 400 students successfully obtain their trade licenses.

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