PLANS & PARTS > ATTACHMENTS & TOOLS > GEAR CUTTING

     
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Gear Cutting Without Index Plates

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
       

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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Gear Cutting Tables
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