I have set up a helix around a shaft. I am trying to do a 1-20 1 inch diameter with 20 threads per inch. The parameters for the helix is pitch but when I plug in 20 I get more threads than 20. Revolutions is also set to 20. Do I need to calculate the pich value or is 20 the right number ?

Bobby

The pitch input is the linear distance of one thread, so it would be 1/20" or .05. Then you could control the length of the helix with either height or number of revolutions.