ADVANCED MECHANICAL DRAFTING

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Presentation transcript:

ADVANCED MECHANICAL DRAFTING LECTURE #6

MMC & LMC MMC = Maximum Material Condition Largest shaft diameter Smallest hole diameter Worst case in most assembly situations LMC = Least Material Condition Smallest shaft diameter Largest hole diameter Certain uncommon situations only

FITS CLEARANCE FIT HOLE SHAFT 1.505 Ø 1.500 1.494 Ø 1.490 CLEARANCE AT MMC = 1.500 – 1.494 = .006 CLEARANCE AT LMC = 1.505 – 1.490 = .015

FITS INFERFERENCE FIT HOLE SHAFT 2.747 Ø 2.741 2.756 Ø 2.752 INTERFERENCE AT MMC = 2.756 – 2.741 = .015 INTERFERENCE AT LMC = 2.752 – 2.747 = .005

INTERFERENCE AT MMC = 3.321 – 3.319 = .002 FITS HOLE SHAFT Ø 3.321 3.315 3.328 3.319 Ø TRANSITION FIT INTERFERENCE AT MMC = 3.321 – 3.319 = .002 CLEARANCE AT LMC = 3.328 – 3.315 = .013

MMC= LMC= GENERAL FIT CONCEPT MAXIMUM INTERFERENCE or MINIMUM CLEARANCE LMC= MAXIMUM CLEARANCE or MINIMUM INTERFERENCE

FITS IN THE MHB Five Major Fit Classes RC – running or sliding clearance fits LC – locational clearance fits LT – locational transition fits LN – locational interference fits FN – force or shrink interference fits Each fit class contains several subclasses All values in fit tables must be multiplied by 1000 before using them in calculations

EXAMPLE Calculate Shaft and Hole diameters and clearances or interferences for a Ø1.50” basic mating shaft and hole in the following fit conditions: RC-7 FN-4 LT-3

SHAFT HOLE CLEARANCE 1.50 - .0030 = 1.4970 1.50 - .0046 = 1.4954 1.50 + .0025 = 1.5025 1.50 + 0 = 1.5000 .003O @ MMC .0071 @ LMC

SHAFT HOLE INTERFERENCE 1.50 + .0031 = 1.5031 1.50 + .0025 = 1.5025 1.50 + .001 = 1.501 1.50 + 0 = 1.500 .0031 @ MMC .0015 @ LMC

SHAFT HOLE CLR or INT 1.50 + .0007 = 1.5007 1.50 + .0001 = 1.5001 1.50 + .001 = 1.501 1.50 + 0 = 1.500 .0007 INT @ MMC .0009 CLR @ LMC

GSH END DESIGN

CHANGING DIMENSION PROPERTIES Left click on dimension to show grips Right click to display change menu Select PROPERTIES Change or add prefix, suffix, precision, tolerances etc.

ADD PREFIX OR SUFFIX Prefixes: Suffixes: 2X, Ø (%%C), R, SØ, SR TYP, MAX, MIN, etc.

CHANGE TO LIMIT .877 .872 Ø TYP EXAMPLE: Dimension .875 Lower limit .003 Upper limit .002 Precision 0.000

MOVE DIMENSION OUTSIDE OF EXTENSION LINES 1.505 1.497