CLEARANCESANDFITS
GuidelinesandTables
MachineDrawing
KLNarayana,P.Kannaiah,K.Venkata Reddy
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Clearances and Fits: Guidelines and Tables for Machine Drawing, Summaries of Automobile Engineering
Guidelines and tables for various clearance fits and hole-shaft combinations in machine drawing. It covers different types of fits such as tight fits, sliding fits, pressed fits, and interference fits, and lists the recommended combinations for different parts and uses. The document also mentions the uses and examples of each fit type.
What you will learn
- What are the differences between pressed fits with medium interference and pressed fits with big interferences?
- What are the different types of clearance fits mentioned in the document?
- What are the uses of sliding fits?
- What is the process for assembling parts with pressed fits?
- What are the recommended hole-shaft combinations for tight fits?
Typology: Summaries
2021/2022
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CLEARANCES AND FITS^ Guidelines and TablesMachine DrawingKL Narayana, P. Kannaiah, K. Venkata Reddy
Hole‐ShaftDescription^ Combination
Uses H8/j7, H7/js6,^ H7/j6 ,Tight fits with smallJ7/h6clearances ornegligibleinterference. Theparts can beassembled ordisassembledmanually.
Easily dismountablefits of hubs of gears,pulleys and bushings,retaining rings,frequently removedbearing bushings. H8/k7,^ H7/k6 ,^ Similar fits with smallK8/h7,^ K7/h6 clearances or smallinterferences. Theparts can beassembled ordisassembledwithout great forceusing a rubbermallet.
Demountable fits ofhubs of gears andpulleys, manualwheels, clutches,brake disks. H8/p7, H8/m7,^ Fixed fits withH8/n7,negligible clearancesH7/m6,^ H7/n6 ,or smallM8/h6,interferences.N8/h7,^ N7/h6 Mounting of fitsusing pressing andlight force. Combinations recommended in^ BOLD Fixed plugs, drivenbushings, armaturesof electric motors onshafts, gear rims,flushed bolts.
GUIDELINES^ ‐‐‐ TRANSITION FITS
KL Narayana, P. Kannaiah, K. Venkata Reddy
Hole‐ShaftDescription^ Combination
Uses Combinations recommended in H8/r7, H7/p6 , H7/r Pressed fits withHubs of clutch disks, 6 , P7/h6 , R7/h6guaranteedbearing bushings.interference.Assembly of theparts can be carriedout using coldpressing.H8/s7,Pressed fits withPermanent couplingH8/t7, H7/s6 ,mediumof gears with shafts,H7/t6, S7/h6 , T7/h6interference.bearing bushings.Assembly of partsusing hot pressing.Assembly using coldpressing only withuse of large forces.H8/u8, H8/u7,Pressed fits with bigpermanentH8/x8, H7/u6,interferences.couplings of gearsU8/h7, U7/h6Assembly usingwith shafts, flanges.pressing and greatforces underdifferenttemperatures of theparts.
BOLD
GUIDELINES^ ‐‐‐ INTERFERENCE FITS
KL Narayana, P. Kannaiah, K. Venkata Reddy