#CLASS_11
a. Define pitch of a screw gauge?
b. What is the least count of screw gauge?
c. What is back lash error?
d. What is zero error of screw gauge?
e. What is a ratchet? Explain its utility?
#bebrianly
Answers
Answer:
Pitch: The linear distance moved by the screw head during one complete rotation.
Least count : Ratio of pitch of screw gauge to the total number of divisions on the circular scale of screw gauge.
Backlash error : When circular scale reading undergoes some appreciable change resulting an error, then it is called backlash error.
Zero Error : When line of graduation and edge of the head scale doesn't coincide with the 0 of pitch scale, then an error occurs known as zero error.
Ratchet : Rachet is attached to the right hand end of thre screw gauge.
Utility : The screw can be rotated by rotating the rachet.
Answer:
In case of micrometre screw gauge the backlash error is the error in which measurement due to backlash of the internal gears.In a pair of machine gears the distance between two space and tooth thickness is called as backlash. Tooth thickness is the distance between two adjacent teeth measured along the pitch circle