Inside diameter 15.5 outside diameter 18 blades + shank,
Inner diameter 16.5 Outer diameter 19 blades + shank,
Inside diameter 18 outside diameter 22 blades + shank,
Inner diameter 20 Outer diameter 24 blades + shank,
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Before drilling is started, center it first, use a twist drill to drill holes on the wooden board to be drilled and drill through;
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Install the knife, install it on the bench drill, start the bench drill, and see if the cutter head is swinging. After confirming, drill under the drill hole on the wooden board. The front is best without vibration), after half of the drilling, reverse the wood, aim at the other side of the drill (repeat the previous operation), and a blank of a finger comes out;
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Grinding. I use a hexagonal handle to polish the rod. I use a wood that can be inserted into the wrench in the front, knock the polishing rod in, and then rotate the wrench on the machine. Use sandpaper 400 mesh 800 mesh 1500 mesh 3000 mesh. 7000 mesh sanding, and finally polishing with cotton cloth is fine. The inside of the sanding is polished with a finger, so that a finger can be used.
