6 - Fits & Clearances Flashcards
How are tolerances classified?
Tolerances are classified as dimensional and geometric.
What is the maximum permissible bow in a steel tube?
The maximum permissible bow in a steel tube is 1:600.
What equipment is required to carry out a run‑out check on a shaft?
A Dial Test Indicator (DTI) and V‑blocks.
What is the maximum bow allowed in a strut?
The maximum bow allowed in a strut is 1 in 600.
Which shaft would you use to obtain a clearance fit in a bush of 0.750‑inch diameter?
A shaft measuring 0.748 inch.
What is checked when using a GO/NO‑GO gauge?
Tolerance is checked.
What is an example of a bilateral tolerance?
2 inches ±0.002.
How is a tolerance defined?
A tolerance is a permitted variation on a dimension to allow for inaccuracy of equipment.
What is a transition fit?
A transition fit is one in which the shaft is the same size as the hole.
What is the minimum length of a blended repair of corrosion relative to its depth?
The repair should be no less than 20 times its depth.
If there is a positive allowance between the smallest possible hole and the largest possible shaft, what type of fit is it?
It is a clearance fit.
After mechanically removing corrosion from an aluminum alloy casting, what should be the minimum length of the blended recess relative to its depth?
It should be no less than 20 times its depth.
What does a press fit require?
A press fit requires some sort of driving force.
What is the typical acceptable limit of a dent on a frame member?
One gauge depth and a 0.75‑inch diameter.
What is the light drive clearance for a 3/4‑inch diameter bolt and hole on a drawing?
0.0015 inches.
