Tumper
Well Known Member
I have seen several methods of marking pushrods for the end rivets and none of them seemed very easy or accurate to me. I had this idea and it has worked great for me, so I thought I?d share it.
For this method you will be required to use a little math, but don?t be nervous it will be OK. The equation for the circumference of a circle (distance around the push rod) is the diameter of the circle times 3.1416. All you have to do is determine the circumference and divide by the number of rivets to get the distance between the rivets.
Here is an example: the pushrod has a diameter of 0.750? so I multiply that times 3.1416 to get a circumference of 2.256?. There are six rivets around the end so divide by six to get 0.393? between the rivets.
Now take a piece of tape and apply it to a flat surface. Mark off a zero line and then measure 0.393? using your handy digital calipers. Then multiply 0.393? times 2 and mark that distance off. Continue to add one to your multiplier until you account for all the rivets. Next, draw a line parallel to the edge of the tape the distance the rivets are supposed to be from the end of the pushrod.
Then pull up the tape and apply it to the end of the pushrod being careful not to stretch the tape when you apply it. There you have it; all your holes are evenly marked and the correct distance from the end of the pushrod, ready to be punched and drilled.
And to speed up the process apply a second piece of tape next to the first and mark both at the same time so you work both ends of the pushrod simultaneously.
For this method you will be required to use a little math, but don?t be nervous it will be OK. The equation for the circumference of a circle (distance around the push rod) is the diameter of the circle times 3.1416. All you have to do is determine the circumference and divide by the number of rivets to get the distance between the rivets.
Here is an example: the pushrod has a diameter of 0.750? so I multiply that times 3.1416 to get a circumference of 2.256?. There are six rivets around the end so divide by six to get 0.393? between the rivets.
Now take a piece of tape and apply it to a flat surface. Mark off a zero line and then measure 0.393? using your handy digital calipers. Then multiply 0.393? times 2 and mark that distance off. Continue to add one to your multiplier until you account for all the rivets. Next, draw a line parallel to the edge of the tape the distance the rivets are supposed to be from the end of the pushrod.
Then pull up the tape and apply it to the end of the pushrod being careful not to stretch the tape when you apply it. There you have it; all your holes are evenly marked and the correct distance from the end of the pushrod, ready to be punched and drilled.
And to speed up the process apply a second piece of tape next to the first and mark both at the same time so you work both ends of the pushrod simultaneously.
![rodends1s.jpg](/proxy.php?image=http%3A%2F%2Fimg339.imageshack.us%2Fimg339%2F6430%2Frodends1s.jpg&hash=6e5c24e6486f88750fd8c6c27fdf811a)