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Question 19.1: Find the shaft and hole dimensions for a loose running fit w...

Find the shaft and hole dimensions for a loose running fit with a 35-mm-diameter basic size.

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From Table 19.1, the ISO symbol is 35H11/c11 (the 35 designating a 35 mm nominal tolerance).

Table 19.1: Examples of tolerance bands and typical applications.

Class Description Characteristic ISO code Assembly Application
Clearance Loose running
fit		 For wide commercial
tolerances		 H11/c11 Noticeable
clearance		 IC engine exhaust valve in
guide
Free running
fit		 Good for large
temperature
variations, high
running speeds or
heavy journal
pressures		 H9/d9 Noticeable
clearance		 Multiple bearing shafts,
hydraulic piston in
cylinder, removable
levers, bearings for rollers
Close running
fit		 For running on
accurate machines
and accurate location
at moderate speeds
and journal pressures		 H8/f 7 Clearance Machine tool main
bearings, crankshaft and
connecting rod bearings,
shaft sleeves, clutch
sleeves, guide blocks
Sliding fit When parts are not
intended to run freely,
but must move and
turn and locate
accurately		 H7/g6 Push fit
without
noticeable
clearance		 Push on gear wheels and
clutches, connecting rod
bearings, indicator
pistons
Location
clearance fit		 Provides snug fit for
location of stationary
parts, but can be freely
assembled		 H7/h6 Hand
pressure
with
lubrication		 Gears, tailstock sleeves,
adjusting rings, loose
bushes for piston bolts
and pipelines
Transition Location
transition fit		 For accurate location
(compromise between
clearance and
interference fit)		 H7/k6 Easily
tapped with
hammer		 Pulleys, clutches, gears,
flywheels, fixed
handwheels, and
permanent levers
Location
transition fit		 For more accurate
location		 H7/n6 Needs
pressure		 Motor shaft armatures,
toothed collars on wheels
Interference Locational
interference fit		 For parts requiring
rigidity and alignment
with accuracy of
location		 H7/p6 Needs
pressure		 Split journal bearings
Medium drive
fit		 For ordinary steel
parts or shrink fits on
light sections		 H7/s6 Needs
pressure or
temperature
difference		 Clutch hubs, bearing
bushes in blocks, wheels,
connecting rods. Bronze
collars on gray cast iron
hubs

From data sheet BS4500A (Table 19.2), the hole tolerance, for a 35 mmhole, is \begin{array}{c}+0.16\\0.00\end{array} mm and the shaft tolerance, for a 35 mm shaft, is \begin{array}{l}-0.12 \\-0.28\end{array} mm.

So the hole should be given dimensions 35.00\begin{array}{c}+0.16 \\0.00\end{array} mm and the shaft 35.00\begin{array}{r}-0.12 \\-0.28\end{array}mm

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