ANSI standards

ANSI Drafting Standards
ASME Y-14.5 2009
Written by ASME or_________________________________
& Accepted by ANSI or______________________________.
ANSI Standards:
_______________ Projection vs. __________ Projection for ISO
Two division of projection methods are __________& ____________
Drawings contain:
Title Block
Revision Block
Flag Notes
General Tolerances
.x = .1
.xx = .03
.xxx = .010
Limit tolerance
Unilateral tolerance
Bilateral tolerance
Rules to live by when Dimensioning
Notate units of measure being used in title block or note (METRIC)
Always dimension features of the object in most descriptive view
Never dimension to hidden lines
Follow dimensioning order:
1. Dimension overall sizes
2. Locate features
3. Add details for manufacturing or construction
Show angles in correct sector that could actually be measured
Ensure all three major dimensions are shown in one of the views
o Length, Width, and Depth
Follow standard practices
o Placement – Not on or inside of part
o Spacing – Clarity
o Dimension from closest edge
o Stagger and group dimension with concentric points
Use Multiples (4X) for repetitive elements
Use unidirectional text
Leaders should theoretically pass through center of circles
Use notes for drilling operations with current symbols
Assume hole is through unless otherwise noted with depth symbol
Always use the Ø and R for Diameter and Radius
Basic dimensions- Theoretical exact size, location in box
Reference dimension- information only (i.e. overall lengths)
Determine best dimensioning method
o Datum / Baseline
o Left to Right/ bottom to top (Tape Measure Rule)
o Chain line – Only hole spacing when deemed most critical (2 holes max)
Tolerancing and Surface Texture
Running Clearance (RC)- shaft must move freely (Inside a bearing or hole)
Location Clearance Fit (LC)- Shaft and Hole may be same size (Line to Line fit)
Location Interference Fits (LN)- Shaft larger than hole (Alignment dowel pins)
Force and Shrink Fits (FN) - Shaft is always bigger (Transmit torque)
MMC- Maximum Material Condition (Weighs most with largest shaft or smallest hole)
LMC-Least Material Condition (Weighs most with smallest shaft or largest hole)
Weld Notes