Scale using 1/128 ths of an inch increments
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Transcript of Scale using 1/128 ths of an inch increments
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Scale using 1/128 ths of an inch increments
Scale using 5/1000 ths of an inch increments
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Measuring eccentricity of stud CLto the thru hole CL
Hole gage dimensions
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Slide gage onto stud
Rotate gage until it touches
hole wall
Slide gage into hole
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#16Top view showing the gage rotateduntil it is tangent with the hole diameter
Road map ofgage hole #’sdimensions
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View showing machinedbushing with a .125” offset
inserted in hole
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.25” Ideal Wall Thickness
Perfect Alignment
.10”Minimum Allowable
Wall Thickness
ExtremeMis-Alignment
Stud Stud
Bushing Bushing
1.875”
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1.375” (bored stud diameter)+ .250” (ideal wall thickness) + .100” (minimum wall thickness)
1.725” outer diameter of gage
Designing a gage to measure the center offset of 2 holes
1.725 1.375 .100.250
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12o(15 divisions each side)
.250 - .100 = .150 (difference in wall thicknesses)
.150/ 15 = .010 difference per division
.010 is too “sloppy” as far asa good, accurate fit. Moreincrements are needed
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Take the average of the wall thicknesses.250 (thickest wall) + .100 (thinnest wall) = .350 / 2 = .175 (average)
Make 2 gages
One gage measures thickness from .250 to .175
One gage measures thickness from .175 to .100
By using the same number of increments on the gages,the smaller and more accurate each increment becomes.
Determining the gage increments
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1.376 .175.250
Gage to measure from .250 to .175
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1.376 .100.175
Gage to measure from .175 to .100
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.250 wall + .100 wall = .350 / 2 = .175 avg. wall thickness