# Modeling/Sprockets

based on W. E. Johns work. but added offsets to accomidate martin sprocket O.D.s

- find angle
- 360/number of teeth=angle between

- draw polygon with tooth count and diameter from chart
- draw horizontal and verticle guides
- click polygon tool and immediately type tooth number
- click the center intersection, place mouse on verticle guide, type in radius

- using radius tool draw guides away from verticle at half the tooth angle on both sides
- using the tape measure tool draw guides the distance of the pitch angle away from the guides just drawn
- place a circle where the guides intersect on either side of center
- when drawing the circle place the mouse on the guide back to center

- draw guides perpendicular at base of the two cricles
- draw guides offset
- 7/64 works for 100# chain

- draw a circle with the center at the intersection of the offset and the original radius guide
- made the edge meet the edge of the circle opposite of center at its shortest distance

- repeat on other side
- delete some of the extra lines and circle parts
- you can use the corner of the original polygon for the tip of the tooth

- using the rotate tool copy the profile at the angle then click astrix and then the number of copies
- as you go you can copy larger sections