I see numerous rules about profile shifting appearing when pressure angles and Teeth get below a certain ratio.
E.g. "Gears that are smaller than 32 teeth for a 14.5° Pressure Angle, or 18 teeth for a 20° Pressure Angle, have a Root Circle smaller than the Base Circle, resulting in the teeth being undercut."
This doc shows how to determine if undercut will occur. Pitch shift can be both positive (usual) and negative(rare).
Negative looks cool - I expect it weakens the gear tooth so undesireable but does look interesting. pg 604 ( doc starts at 595).
Should we detect undercut and auto shift or just annotate and ask (and maybe add a page about undercut to the tabs) ?
I see numerous rules about profile shifting appearing when pressure angles and Teeth get below a certain ratio.
E.g. "Gears that are smaller than 32 teeth for a 14.5° Pressure Angle, or 18 teeth for a 20° Pressure Angle, have a Root Circle smaller than the Base Circle, resulting in the teeth being undercut."
This doc shows how to determine if undercut will occur. Pitch shift can be both positive (usual) and negative(rare).
Negative looks cool - I expect it weakens the gear tooth so undesireable but does look interesting. pg 604 ( doc starts at 595).
seems simple - basically shifting the addendum and dedendum while leaving base circle in same place.
Should we detect undercut and auto shift or just annotate and ask (and maybe add a page about undercut to the tabs) ?