July 1, 2004
Are you equipped with the information needed to successfully design your company’s geared applications? If you were given the design for your gear teeth would you be able to successfully put that tooth on a gear blank so that you could design the rest of your product, or even seek quotes from suppliers?
Geared applications must be designed around the gear set. But most companies today rely on suppliers and consultants for gear design rather than cultivate the skill in-house. This makes the design engineer dependant on outside resources for critical information that affects his/her project design at the most fundamental level.
Having seen the same questions come from customers time and again, Russell Beach of Nissei Corporation of America created a 3-part layout guide series covering straight bevels, spiral and Zerol bevels and hypoids to help people deal with the questions. Some of the most helpful information contained in the guide are the 9 Critical Steps to Straight Bevel Gear Layout:
- Layout the pinion and gear axes.
- Locate the Pitch Line relative to the axes.
- Locate the Pitch Point on the Pitch Line.
- Construct a normal to the Pitch Line through the Pitch Point.
- Construct another normal along the Pitch Line at the Face Width dimension.
- On the normal at the outside, measure off the gear and pinion Outer Addendums and also the gear and pinion Outer Dedendums.
- From the Pinion Outer Addendum and at the Pinion Face Angle, draw a line connecting the two normals.
- Draw a line at the Gear Face Angle from the Gear Outer Addendum connecting the two normals to establish the gear face.
- Draw lines at the pinion and gear Root Angles, from the pinion and gear Outer Dedendum points, connecting the normals to create the pinion and gear tooth Root Lines.
Mr. Beach says it is as simple as it looks, and using this knowledge, the design engineer will be able to work more effectively. He/she will be less dependant on outsourced information, able to design applications more quickly and able to communicate more intelligently with gear suppliers, achieving a more streamlined project development and a better product over all.