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Computer Aided Design (CAD). Week 10 :: Limits, Fits and Tolerances. Limits and Fits Example Application. Clearance Fit. Interference Fit. Limits and Fits - Terminology. TRANSITION FITS. INTERFERENCE FITS. CLEARANCE FITS. Limits and Fits - Terminology. POSITIVE.

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computer aided design cad

Computer Aided Design(CAD)

Week 10 :: Limits, Fits and Tolerances

limits and fits example application
Limits and FitsExample Application

Clearance Fit

Interference Fit

limits and fits terminology1

TRANSITIONFITS

INTERFERENCEFITS

CLEARANCEFITS

Limits and Fits - Terminology
limits and fits classification
Limits and Fits – Classification
  • H11-c11 – Extra loose running fitProvides a large clearance. Gives easy assembly.
  • H9-d10 – Loose running fitUsed where ease of assembly is required (e.g. pulleys)
  • H9-e9 – Easy running fitSuitable for smaller parts, e.g. camshafts etc.
  • H8-f7 – Normal running fitGood quality fit which can be easily produced.
  • H7-g6 Close running or Location fitExpensive to produce.
  • H7-h6 Precision slide or Location fitPrecision Slides with good lubrication under constant Temp.
limits and fits classification1
Limits and Fits – Classification
  • H7-k6 – Push or easy keyring fitLocation of parts which are not dismantled often.
  • H7-n6 – Tight keyring fitTight assembly of long parts where H7-k6 isn’t sufficient.
  • H7-p6 – Light drive fitUsed to secure steel parts. Dismantel & renewal required.
  • H7-s6 – Heavy drive fitPermanent assembly of ferrous parts. Shrunk-fit required.
limits and fits question
Limits and Fits - Question
  • Consider a Drive pulley and shaft assembly (shaft = Ø40). The keyway provides positive drive rotation.The required fit is H7-h6.Calculate:the Maximum and MinimumLimits for the size of Hole & Shaft.
limits and fits solution
Limits and Fits - Solution
  • Ø40 H7 = +25 upper 0 lower

I.E.: Max Limit of Size of Hole: 40 + .025 = 40.025

Min Limit of Size of Hole: 40 – 0 = 40.000

  • Ø40 h6 = -16 upper 0 lowerI.E.: Max Limit of Size of Shaft: 40 - .016 = 39.984Min Limit of Size of Shaft: 40 – 0 = 40.000
machining and surface texture
Machining and Surface Texture

3.2

3.2

Machining of Surface (removal of material) is Prohibited!

Surface Roughness of 3.2 µm(Machining Optional)

Machining of Surface is Required

machining and surface texture1
Machining and Surface Texture

All surfaces are to be machined. A value can be added as necessary.

Typical Drawing with Surface Roughness