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This view shows the drill bit in contact with the flat portion of the
strut. When you cut your struts, you included extra length for the
tabs. For 3/4" conduit, I leave 1" from the end of the flat portion
to the center of the hole, so that means I cut each strut 2" longer than
the length that the
calculatordome
calculator indicates is needed. The
conduit dome tips page
suggests that only 3/4" is needed. I think it is a matter of taste,
and either is really fine.
Just be sure to take into account the exact amount of distance from the center of the hole on each end to the end of the conduit in your calculations. And, of course, make sure your conduit drilling jig is adjusted so that when you insert a strut and push it against the plywood end of the jig, the drill bit is the same distance from the end of the strut as you assumed when you cut the struts. In other words, don't measure and cut your struts as if the holes will be in one place and then drill them in a different place. |