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Arbor
– The shank for a drill chuck, cutter holder
or other device that is inserted into a spindle.
Back Lash
– The amount of play between a lead
screw and nut or between two gears.
Collet
– Device for holding cutting tools in a spin-
dle.
End Mill
– Cutting tool used for slotting and fac-
ing in metal.
Facing
– Cutting a surface to reveal a new face.
To reduce the thickness of a workpiece.
Fly Cutter
– Cutting tool used for a facing opera-
tion.
Gib
– A tapered strip of metal in the dovetail
ways that can be adjusted for wear.
Head Stock
– That portion of the machine that
supports the spindle/quill assembly.
Lead Screw
– The threaded rod that when
turned, causes the table to move.
Quill
– Houses the spindle and allows the spin-
dle to be adjusted up and down in the head stock.
R-8
– Designation for the spindle taper. Universal
in that all arbors and collets with this number will
fit this spindle.
X Axis
– The direction of motion when the table
moves from left to right or right to left. Turning the
longitudinal hand crank creates this motion.
Y Axis
– The direction of motion when the table
moves from front to back or from back to front.
Turning the cross slide hand crank creates this
motion.
Z Axis
– The direction of motion when the table
or spindle moves up or down. Turning the knee
hand crank or the spindle handles creates this
motion.
Zero the Dial
– Having positioned the table to a
desired location, the dial on the hand crank is
rotated to zero while maintaining the hand crank
position.
Glossary
Fraction
Decimal
Fraction
Decimal
Fraction
Decimal
1
⁄
64
0.015625
23
⁄
64
0.359375
45
⁄
64
0.703125
1
⁄
32
0.031250
3
⁄
8
0.375000
23
⁄
32
0.718750
3
⁄
64
0.046875
25
⁄
64
0.390625
47
⁄
64
0.734375
1
⁄
16
0.062500
13
⁄
32
0.406250
3
⁄
4
0.750000
5
⁄
64
0.078125
27
⁄
64
0.421875
49
⁄
64
0.765625
3
⁄
32
0.093750
7
⁄
16
0.437500
25
⁄
32
0.781250
7
⁄
64
0.109375
29
⁄
64
0.453125
51
⁄
64
0.796875
1
⁄
8
0.125000
15
⁄
32
0.468750
13
⁄
16
0.812500
9
⁄
64
0.140625
31
⁄
64
0.484375
53
⁄
64
0.828125
5
⁄
32
0.156250
1
⁄
2
0.500000
27
⁄
32
0.843750
11
⁄
64
0.171875
33
⁄
64
0.515625
55
⁄
64
0.859375
3
⁄
16
0.187500
17
⁄
32
0.531250
7
⁄
8
0.875000
13
⁄
64
0.203125
35
⁄
64
0.546875
57
⁄
64
0.890625
7
⁄
32
0.218750
9
⁄
16
0.562500
29
⁄
32
0.906250
15
⁄
64
0.234375
37
⁄
64
0.578125
59
⁄
64
0.921875
1
⁄
4
0.250000
19
⁄
32
0.593750
15
⁄
16
0.937500
17
⁄
64
0.265625
39
⁄
64
0.609375
61
⁄
64
0.953125
9
⁄
32
0.281250
5
⁄
8
0.625000
31
⁄
32
0.968750
19
⁄
64
0.296875
41
⁄
64
0.640625
63
⁄
64
0.984375
5
⁄
16
0.312500
21
⁄
32
0.656250
1 1.000000
21
⁄
64
0.328125
43
⁄
64
0.671875
π
3.141593
11
⁄
32
0.343750
11
⁄
16
0.687500
1mm
0.03937"