OK, now that I have your attention, I have never found a way to make a square hole with a round bur, but I will be making square holes today with burs and a file
First thing to do is to make sure you have a good layout plan. I prepare the 22 gauge silver sheet I am using with 90 degree edges. I measure out 2mm increments on my Dial Caliper (I would have used my Digital Calipers if the battery wasn’t dead) and scribe lines from both straight edges. I make a grid, then mark very light lines in the middle of these lines (1mm increments) so I can find the center of each 2mm block. I use the tip of my metal scribe to make a “divot” to start a pilot hole for drilling.
After the holes are drilled, I take a small 0.7mm Cylinder Bur and carefully “square-off” the round holes, to make filing easier.
Now I use a #6 Cut 4-Square Escapement File to make the holes square.
Now I have all of these pieces and parts…… in the next blog post, let’s see what we can turn them into.
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