I know I have to cut the hole in the board, but is it necessary to cut a hole in the cake as well? Or just stack and let the pipe push it out? I have used this technique only a handful of times, and I always cut the hole in the cake too! If its not necessary, I could save time and cut it out LOL! If it is, glad I have been doing it
I have always cut the whole out of the cake center. Makes less mess in the long run and easier to put the cake on the center pole ..you can see what your doing. Wilton had (don't know if they still do..) had a cake corerer (sp?) that worked great.. but i use anything available when I cant locate mine.
You should cut a hole in your cake as well. Pushing a pipe through it may damage the cake/icing, compromising the structural integrity of the cake. It also looks messy.
Depending on the diameter of your pipe, you can use a Wilton hidden pillar to core your cake. Or, at least get the hole started.