Hello friends. I made a tool to find the center. There is no misalignment. I was able to make a very accurate tool using a drill stand. Jig plan convenient for woodworking [Plan List] jsk-koubou.stores.jp/
I found one of these - but with the pencil missing - in a handful of small woodworking bits I inherited many years ago. I asked a few people what it was but no-one knew. Now I shall have to make one for myself! (The one I inherited also had a little round spirit bubble in the top.) Domo arigato!
Do you notice that when you turn on, and especially when you turn off the drill, does the speed increase? This is because the drill is not working at its nominal power. You should actuate the trigger with a seal at its maximum travel and place an extra switch on the machine frame. Even the perforations are going out more accurate. Greetings from Argentina!
One problem: The center line that is placed before punching a guide hole, must be exact, otherwise the block will not line up when turning it. Now what?
go next step. Drill second hole between center and stop or one quarter to three quarters stop to stop to 'quarter' a board. drill a third hole in the other half at one third stop to stop to 'third' a board.
Actually you induce error by turning the peace for 180 degree, if first center punch is not in the middle precisely! What you should do is drill first hole through work peace and bottom helping peace, than move both by some offset and with pin connecting them, than drill second hole on work peace, than offset only work peace and align it with pin...
I think the glue just added a bit more resistance since the hole was a bit on the large side. The glue didn’t stick to the pencil but made the hole a bit smaller.
