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| how to accurately mill a rectangle with rounded corners (no cnc) |
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| Lew_Merrick_PE:
Picclock, Ah, so I did totally misunderstand the question. How about this approach: (1) Drill & ream (4) holes at the center of the R60 mm corner radius points of sufficient depth to get the tip of a test indicator to read. (2) Mill the straight portions of the o-ring groove at the appropriate 60 mm set-over from the holes (using stops set to the CL positions of the Item 1 reamed holes). Repeat four times. (3) Set-up your rotary table and set your zero to its center. Position the part to the rotary table dialing in on the (Item 1) reamed holes. Rotary mill each quadrant. Repeat four times. Remember that the index holes do not need to go through the part, merely deep enough for you to get the ball-edge of your test indicator to ride below the edge where the index hole meets the surface. ??? |
| Jasonb:
Or drill the 4 holes in the bottom of the plate and have a spigot in the rotary table for them to locate over. J |
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