Finding the center of a pipe?

[Oneslowz28]

Anyone have a jig design or method that would allow me to locate the center of a pipe? I need to drill some holes in some steel pipe for my McWire project.

[Mach]

Assuming you want to drill perpendicular to the pipe

http://www.amazon.com/Woodstock-D3098-Center-Finder/dp/B0000DD4KF

http://www.amazon.com/Rockler-J-Square-Center-Finder/dp/B001FTJ0JM

A v-block is what I've seen used in the past

http://home.comcast.net/~kvaughn65/v_block.jpg

This looks cool

http://toolmonger.com/2007/11/05/perfectly-perpendicular-holes-without-a-drill-press/

[Eclecticos]

http://www.analyzemath.com/Calculators/Cen_Rad_Cal.html

Find the Center and Radius of a Circle with this Calculator.