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140. Split Muff ConpUnss — This form of coupling, which la shown
in Figs. 259 and 260, la very easily put on or taken off, it has no pro-
jecting parts, the bolts being completely cohered, and, hke the solid
muff couplings, it maj be used as a dm ing pulley, or a driving pulley
may be placed on it In making this coupling the faces foi the joint




Kg 25fl FiQ 2aO

between the two halves of the box are hrst planed Tiio bolt-holes are
then drilled and the two hil've'" biJtcd together with pieces of paper
between them ; then the muff is bored out to the 0">i:act size of the shaft.
AVhen the paper is remoied and the bo\. put on the shaft and bolted
up, the box gripes the shaft firmlj. The key has no taper and should
fit on the sides only.
I02



MACHINE DRAWING AND DESIGN.
Dimemdons of Split Muff Couplings.
Diameter of shaft, D . •



Diameter of Box, Di.
Length of Box, L.
Diameter of Bolts, d.
Number of Bolts ..
14

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11


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14


16


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6



141. Cast-iron Flange Coupling. — In this form of coupling, which is
shown in Fig. 261, there are cast-iron centre pieces or bosses, provided
with flanges which are keyed to the ends of the shafts to be connected.
