43° 
APPENDIX 
3 Q. What must be allowed for when designing a fixture, if 
the piece has previously been worked upon ? A. Allow for 
burrs. 
4 Q. Which is better practice, to mill toward the solid or the 
movable jaw of a fixture? A. Toward the solid jaw. 
5 Q. What must first be decided before a jig or fixture can be 
designed? A. The locating points must be known. 
6 Q. What relation must the feet of a jig bear to the guide 
bushings ? A. All bushings must be inside the geometrical 
figure formed by the feet. 
7 Q. If the fixture is to be used on a machine which has “T” 
slots, what should be provided on the fixture? A. The 
base of the fixture should have keys or tongues to fit the 
slots and they should be square with the holding points. 
8 Q. Where should clamps be provided to best resist springing? 
A. Opposite the bearing points. 
9 Q. Which are better for fixture work, straight or taper pins? 
A. Taper pins. 
10 Q. Which would be the better, a jig designed so as to admit 
the piece one way only, or one into which the piece could 
go several ways? A. Have opening so as to allow piece 
correct way only. 
47. Apprentice Test 
(2) Subtract 59763 
47857 
(1) Add 8297 
4335 
1759 
(3) Divide 68256 4-432 
(4) Multiply 79643 
X 448 
(5) Point off this number 7607548. 
(6) Put in figures in decimal form this number:— Four thou 
sand, five hundred and ninety-seven hundred thousandths. 
(7) The answer of this (427) 2 =