Tolerances

It is necessary today to hold precise tolerances to insure the interchangeability of parts
Tolerances:
The process of determining how much a dimension can vary for a part to fit
How accurate is 1/4?
.25
.250
.2507 <---

Basic size  of a rim
Tolerance: Amont of dim varies from basic size.

Feature:
USed to indentify the geometry of the drawing being referred to
-hole
-cut
-extrusion

Limits: The maximum and minimun allowable size

Allowance: Limits where the smallest clearence or largest interference occuring in measurement at MMC

Tolerance style:
Limints dim: Anything in between is good
Plus+Minus Dim: Known as deviation
Symmetrica: Same as +/-
MMC:
Maximum Material Condition
The limit of a dim where the max is left on part
LMC:
Least Material Condition
Least amount of material is left on part

Type of fit:

Clearence:
All dims combinations will produce a clearence

Interferance:
Will create a force fit

Transitional:
Produce different kinds of fit