Hole Tolerance Calculator

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Tolerance Worksheet

Transcript of Hole Tolerance Calculator

FIXED FASTENER TOLERANCE CALCULATION

ASME Y14.5M-1994 APPENDIX B4

ENGINEERS NAME EXTENSION

DATE JOB REF

DRAWING N0. GRID DRAWING TITLECLEARANCE HOLE PATTERNTHREADED HOLE PATTERN

3 VALUES MUST BE ENTERED TO CALCULATE 4TH

ENTER VALUE CALC VALUE 40/60 SPLIT

CLEARANCE HOLE MIN Ø H 0.1840 0.1830 CLEARANCE

CLEARANCE POS Ø 0.0110 0.0140 0.008 CLEARANCE

THREAD MAX MAJOR Ø F 0.1640 0.1650 CLEARANCE

THREAD POS Ø 0.0080 0.0090 0.012 CLEARANCE

CONVERT +- TOLERANCE TO POSITIONAL DIAMETER

IF X TOLERANCE RANGE = Y TOLERANCE RANGE

X TOLERANCE RANGEY TOLERANCE RANGE

T1

T2

EQUIVALENT POSITIONAL Ø 0.0000

By: K. Tunmore

Warning: The information and formulae within the spreadsheet are based on tertiary sources, original research, particular assumptions and calculations. Some information or results may be incorrect. This spreadsheet, its information, and its calculations should only be used as a general reference. Always verify results. Use at your own risk!

FIXED FASTENER TOLERANCE CALCULATION

ASME Y14.5M-1994 APPENDIX B4

ENGINEERS NAME EXTENSION

DATE JOB REF

DRAWING N0. GRID DRAWING TITLECLEARANCE HOLE PATTERNTHREADED HOLE PATTERN

3 VALUES MUST BE ENTERED TO CALCULATE 4TH

ENTER VALUE CALC VALUE 40/60 SPLIT

CLEARANCE HOLE MIN Ø H 0.5300 0.5150 CLEARANCE

CLEARANCE POS Ø 0.0150 0.0300 0.012 CLEARANCE

THREAD MAX MAJOR Ø F 0.5000 0.5150 CLEARANCE

THREAD POS Ø 0.0150 0.018 CLEARANCE

CONVERT +- TOLERANCE TO POSITIONAL DIAMETER

IF X TOLERANCE RANGE = Y TOLERANCE RANGE

X TOLERANCE RANGEY TOLERANCE RANGE

T1

T2

EQUIVALENT POSITIONAL Ø 0.0000

To calculate a value for T2 - required positional tolerance of threaded hole - enter the 3 known values.

Same principle applies for calculating any one of the other tolerances given the remaining 3.

FIXED FASTENER TOLERANCE CALCULATION

ASME Y14.5M-1994 APPENDIX B4

ENGINEERS NAME EXTENSION

DATE JOB REF

DRAWING N0. GRID DRAWING TITLECLEARANCE HOLE PATTERNTHREADED HOLE PATTERN

3 VALUES MUST BE ENTERED TO CALCULATE 4TH

ENTER VALUE CALC VALUE 40/60 SPLIT

CLEARANCE HOLE MIN Ø H 0.5300 0.5000 CLEARANCE

CLEARANCE POS Ø 0.0300 0.012 CLEARANCE

THREAD MAX MAJOR Ø F 0.5000 0.5300 CLEARANCE

THREAD POS Ø 0.0300 0.018 CLEARANCE

CONVERT +- TOLERANCE TO POSITIONAL DIAMETER

IF X TOLERANCE RANGE = Y TOLERANCE RANGE

X TOLERANCE RANGEY TOLERANCE RANGE

T1

T2

EQUIVALENT POSITIONAL Ø 0.0000

To calculate values for T1 & T2 - required positional tolerances of holes with typical 60-40 split in favor of threaded hole - enter the 3 known values.

Greater positional tolerance is given to threaded holes as they do not benefit as much from MMC and because there is typically more tolerance build up in the process of machining tapped holes.

FIXED FASTENER TOLERANCE CALCULATION

ASME Y14.5M-1994 APPENDIX B4

ENGINEERS NAME EXTENSION

DATE JOB REF

DRAWING N0. GRID DRAWING TITLECLEARANCE HOLE PATTERNTHREADED HOLE PATTERN

3 VALUES MUST BE ENTERED TO CALCULATE 4TH

ENTER VALUE CALC VALUE 40/60 SPLIT

CLEARANCE HOLE MIN Ø H 0.5300 0.5560 INTERFERENCE

CLEARANCE POS Ø 0.0280 0.0020 0.012 INTERFERENCE

THREAD MAX MAJOR Ø F 0.5000 0.4740 INTERFERENCE

THREAD POS Ø 0.0280 0.0020 0.018 INTERFERENCE

CONVERT +- TOLERANCE TO POSITIONAL DIAMETER

IF X TOLERANCE RANGE = Y TOLERANCE RANGE

X TOLERANCE RANGE 0.02Y TOLERANCE RANGE 0.02

T1

T2

EQUIVALENT POSITIONAL Ø 0.0283

Convert 'square' +- tolerance zones to equivalent circular position tolerance. Enter total range of X and Y tolerance, not variation from nominal. Only works properly if X tolerance range = Y tolerance range.

To do a worst case interference check on existing parts/drawings enter all 4 values.

If interference is found it is indicated here. Amount of interference can be calculated by finding the difference between Entered and Calculated value for any of the 4 tolerances. In This case the potential interference at worst case is:

.556 - .530 = .026 .028 - .002 = .026 .500 - .474 = .026 .028 - .002 = .026

Convert 'square' +- tolerance zones to equivalent circular position tolerance. Enter total range of X and Y tolerance, not variation from nominal. Only works properly if X tolerance range = Y tolerance range.