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50 mm hole, how to approach ?

50 mm hole in 32 mm thick x longish steel plate

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Trevor Wright	03/02/2014 12:58:52
139 forum posts 36 photos	Paul, One method not mentioned here is to use a 10ish end mill and plunge vertically on a path to leave the bore and a plug.....rotary table method, turn and plunge every 1/2 degree till you have a circle.....or get the calculator out and work out the co-ordinates for 1 or 2 degree steps. Not as time consuming as you think as the numbers for X and Y reverse as you pass 45°. Finish with a boring head. Trevor
Ian S C	04/02/2014 10:26:28
7468 forum posts 230 photos	If you don't have a boring head, a bit of work with a fly cutter can get you fairly close, keep the speed down. Ian S C

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