MD 8 Gears Pt.3

In involute teeth, the pressure angle is often defined as the angle between the line of action and the lone of tangent to the pitch circle. It is also termed as _____.

• helix angle

• angle of recess

• angle of obliquity

• arc of action

The amount by which the width of a tooth space exceeds the thickness of the engaging tooth on the pitch circles.

• backlash

• clearance

• undercut

• chordal thickness

What will be the effect in bushing gears without backlash?

• jamming

• overheating

• overload

• all of these

Range of helix angle on helical gear.

• less than 18

• 15-25

• 20-35

• 35-40

It refers to the surface of the gear between the fillets of adjacent teeth,

• top land

• bottom land

• pitch

• fillet

A plane perpendicular to the axial plane and to the pitch plane. In gears with parallel axis, the tranverse plane and the plane of rotation coincide.

• transverse plane

• principal reference plane

• normal plane

• pitch plane

Intermediate gear is also called _____ gear in a gear train arrangement.

• idler

• pinion

• third gear

• mounted gear

The top and bottom land for gears is similar formed as the crest and _____for screw thread.

• flank

• root

• flank tooth

• topland

For economical cost in the manufacturing large worm gears the following materials are usually applied.

• bronze rim with cast steel spider

• cast iron rim with bronze spider

• cast steel rim with brass spider

• alloyed aluminum rim with cast iron spider

If a set of spur gears are made, installed and lubricated properly, they normally may be subjected to failures like _____.

• tooth spalling

• tooth peening

• pitting

• shearing