i' M\<iiiNT. I>I;A\VIN<; \\n EHBMH 



7. Give sketches of a pedestal to be carried by the brock, r m 



fig. 109, p. 117, to support the shaft shown in section. 

 98. What is the object of using conical bearings for the latin- 

 spindle shown in fig. Ill, \>. 11* ? Describe how adjust 

 ment i made fT wear. Show by sketches li<>\\ tin- h.-.id- 

 stock is secured to the bed of the lathe. 



j!9. Sketch ..in- form of hanger suitable f--r snpp.,1 t in- mill- 

 shafting. 



n. i,r \\hat -i i. MI instances is such a bearing used as is shown 

 in ti-_r. 1 IL'. p. 1 1' 1 ' U it necessary to lubricate sueh a l..-ar 

 ing? Why is a covering or 1 , v< j.i-..\ id.-d f.,r tin- shaft ' 

 31. A shaft running at 100 revolutions per minute drives anoth, i 

 I iy a leather belt. Pulley m first shaft 1* inehe.H diameter ; 

 pulley <m second shaft :;o im-hes diameter. Kind th.-Hpeed 

 of the seeond shaft. Suppose the same belt is tx dn 

 second shaft at 4U revolutions pn- minute. Find th- 

 diameters of the t\\o jmlleys. 



I'.y means of sketches and a description show how the two 

 . nd.s of a leather belt are united. Describe also how a 

 belt in motion is shifted from the fast to the loos- pulley. 



i:\plaiu \vhy the diameter of a l n -lt pulley is ,,ften made 

 greater at the centre than at the edges. < :i\ < th, : 

 why the arms of cast-iron pulleys are often cur\ 

 :'. l The pitch circle of a spur wheel is 2 feet in diameter and th<- 



wheel has 8() teeth. Calculate the pitch of th<- te. th. 

 : :.".. \\ hat must be the diameter of the pitch ciivlr of a spur 



wheel which has 95 teeth of 2 inches pitch ? 

 86. A spur wheel has teeth of :; im-hes pitch. Sketch a tooth 

 and mark <m it the thickness of the pitch line, and the 

 height above and below the pitch lm 



Hiow by a sketch what is meant by clearance of wheel teeth. 



-ii..w what is meant by a mortice wheel, and show how tin- 

 teeth are fixed in the wheel rim. 



^how by sketches how the segments of a spin Hy wheel or 

 other large wheel may be join* ,1 



40. Describe IMW the parts of the spur wheel in fig. 107. p. 1 1.. 



are put together, and explain why the wheel is made in 

 segments. 



41. Sketch in section a pair of bevil win < Is in ^'ear with one 



another. The centre lines of the shafts and the form of the 

 h surfaces of the wheels are required to be carefully shown. 



