APPENDIX

431

(8)  y/20164  =
(9)  Sketch  each  of  these:—
(a)  Square
(b)  Rectangle
(c)  Hexagon
(d)  Pentagon
(e)  Semicircle
(f)  Ellipse
(g)  Right  angle  triangle
(10)  Find  the  circumference  of  a  wheel  which  is  5"  in  diameter.
(11)  Multiply  7X  3/16:  3/4  X  5/8:  3  1/4X2  1/2:
(12)  What  would  be  the  cost  of  eight  1/2"  X  5"  machine  bolts
at  1  5/8  cents  each?
(13)  Change  7/32  to  a  decimal.
(14)  Change  .3125  to  a  fraction.
(15)  Give  the  area  in  square  feet  of  a  room  15'  X  25'.
48.  Trade  Questions  for  Machinists
1.  How  many  ways  do  you  know  for  turning  a  taper?
2.  Name  five  types  of  work  which  can  be  done  on  a  universal
miller.
3.  What  machines  and  tools  would  you  use  for  surfacing  a
flat  cast  iron  plate  16"  x  25^  x  2"?
4.  What  is  the  most  important  thing  to  look  after  before
starting  the  feed  on  a  cylindrical  grinder?
5.  What  causes  a  drill  to  cut  larger  than  its  diameter?
6.  How  should  a  lathe  tool  for  use  on  brass  differ  from  one  for
use  on  steel?
7.  What  type  of  machine  do  you  consider  capable  of  the
greatest  variety  of  work  ?
8.  Which  would  you  run  at  the  greater  R.  P.  M.,  a  slotting
saw  5"  diameter  or  an  end  mill  1  $4"  diameter?
9.  What  will  be  the  result  of  leaving  chalk  on  a  steel  or  iron
surface?
10.  How  much  stock  is  usually  left  for  reaming?