by willofiam » Sat Jan 21, 2017 5:35 pm
How do everyone. lets see if I can help explain how to find the offset for radial rake and or tooth cutter offset for things like ratchet wheels or an escape wheel ect...This is a simplified way of doing it and adequate for making cutters or ratchet wheels. say we need the 6 degree offset and we are using a 1" diameter brass blank for our wheel or ratchet.
first find the circumference.
Multiply pi (approximately 3.14) and the diameter of blank to get the circumference.....3.14 (pi)x 1" = 3.14"
We want 6 degrees....that is 6 degrees out of 360 degrees, or 6 divided by 360.....6 ~ 360 = .0166
now take our circumference times .0166 or 3.14 x .0166 = .0523"
move the cutter from center .0523" to get an approximate 6 degree offset
thats pretty close for these small angles and what we have going on here.
another example;
a 1.75" diameter blank and we want 8 degrees offset
1.75" x 3.14 = 5.495 (circumference)
8~360 = .022
5.495" x .022 = .122" move the cutter .122" from center of work piece.
If anyone notices a mistake with what I did please let me know right away so we can correct it, or if you have another way that is easy to understand please put it up, Thanks
Have a great day, William