| Gear
Cutting Without Index Plates
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Do
accurate gear cutting (or other circle
dividing) up to 100 teeth (or divisions) on
your rotary table without use of expensive
index plates. (For the folks who do not
have computers to do the calculations!)
Tables of
direct dial settings calculated to 18 decimal
places and are accurate to 1 second of arc,
which is only 1/3600th degree! There are no
cumulative errors as you cut gears or divide
circles. You could calculate these yourself,
but for just a 26 tooth gear you will have to
make 78 calculations and hope that they are
all correct! Degrees, minutes and seconds are
needed for each tooth. If your rotary table
dial doesn't include seconds, just round them
to the nearest 1/4 or 1/2 degree.
As an example, here are the dial settings from
the table to cut a 26 tooth gear. Would you
want to use a calculator to do this?
| Deg. |
Min. |
Sec. |
|
Deg. |
Min. |
Sec. |
|
Deg. |
Min. |
Sec. |
|
13 |
50 |
46 |
|
138 |
27 |
42 |
|
263 |
4 |
37 |
|
27 |
41 |
32 |
|
152 |
18 |
28 |
|
276 |
55 |
23 |
|
41 |
32 |
18 |
|
166 |
9 |
14 |
|
290 |
46 |
9 |
|
55 |
23 |
5 |
|
180 |
0 |
0 |
|
304 |
36 |
55 |
|
69 |
13 |
51 |
|
193 |
50 |
46 |
|
318 |
27 |
42 |
|
83 |
4 |
37 |
|
207 |
41 |
32 |
|
332 |
18 |
28 |
|
96 |
55 |
23 |
|
221 |
32 |
18 |
|
346 |
9 |
14 |
|
110 |
46 |
9 |
|
235 |
23 |
5 |
|
360 |
0 |
0 |
|
124 |
36 |
55 |
|
249 |
13 |
51 |
|
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The
tables include the direct dial settings for
every gear from 8 to 100 teeth, plus tables of
gear pitch diameters for 14 pitches in a range
from 6 to 120. Also, there are formulas and
examples to calculate various other aspects of
gears.
Gear
tables - 25 pages
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"I
remember seeing your display at the 1995 NAMES show
and was very impressed with the quality of your plans
and designs." - Michael A. Latcha (Farmington
Hills, Michigan)
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