Fits, Tolerance & Surface Roughness
Specify fits and tolerances that assemble first-time and surface finishes that meet function — without over-engineering.
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About this course
Course overview
A deeply practical course on the dimensions every engineer specifies but few master. Covers ISO and ANSI fits, tolerance stack-up analysis, surface roughness specification per ISO 1302, and how to communicate it all on a drawing without ambiguity.
Curriculum
What you'll cover
Fits & Limits
Hole-basis vs. shaft-basis, clearance/transition/interference fits, ISO 286 and ANSI B4 systems.
Tolerance Stack-Up
Worst-case and statistical (RSS) analysis, 1D and 2D stacks, and design rules to keep stacks small.
Surface Roughness
Ra, Rz, Rmax — what they mean, when each matters, and how to specify per ISO 1302 and ASME Y14.36.
Outcomes
By the end you'll be able to
- Choose appropriate fits for any mating assembly
- Run worst-case and statistical tolerance stacks
- Specify surface finishes that meet function without driving cost
Who it's for
- • Mechanical designers
- • Manufacturing engineers
- • Quality engineers
Prerequisites
- • Comfortable reading engineering drawings
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