Mechanical Engineering - Machine Design - Discussion

Backless=tooth space -tooth thickness.

Backlash may or may not be desirable. It is unavoidable for nearly all reversing mechanical couplings, although its effects can be negated or compensated for. In many applications, the theoretical ideal would be zero backlash, but in actual practice some backlash must be allowed to prevent jamming. Reasons for the presence of backlash include allowing for lubrication, manufacturing errors, deflection under load, and thermal expansion.

Backlash, a clearance between mating gear teeth. The difference between the circle thickness of one gear and the tooth space of the mating gear. This prevents overheating and tooth damage.

For more clarification see gear profile diagram.

Please give sufficient clarification.

How backlash is related to pitch line velocity?

Reasons for the presence of backlash include allowing for lubrication, manufacturing errors, deflection under load, and thermal expansion.

What do you mean by backlash?

Whenever the slide is reversed there is some loss of motion between nut and screw due to backlash why because module and velocity of the pitchline.