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MMC Slot Legacy

Lukas
So I realized I've been doing MMC on a slot (using legacy) wrong for a few months...lol...Smiley

Here's what I have been doing:
Probing planes on each side of the slot,
Creating a width using the 2 planes,
Constructing a circle using "Auto​" (so it becomes a Cast circle...)
Then dimensioning the position of the circle in the relevant axis using MMC: inputting the slot tolerances into the diameter size in the dimension.

I forget how to do it correctly. Generic circle, right? I wonder how messed up my results have been. A quick test shows only a few tenths difference between the methods. Any input? Should I fix all of these mistakes?
Parents
  • I always measure the slot as a slot, be it round or square. If it is a LONG round slot (with lots of flat) I select it as a round slot, then change to square slot with a big enough radius to keep it on the flats (with some cushion) and measure it using the WIDTH measure option turned on. Now, you can report the slot AS IS using legacy, but the MMC will always come from the width (or 'diameter') of the slot. This is more than fine for automotive as the length of the slot is (99.9999999999999999999999999% of the time) just clearance for assembly of a round bolt. If you need to specifically do it for the length, you create a generic circle, using the slot THEO and the slot measurement, but you use the LENGTH for the diameter calculations.
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  • I always measure the slot as a slot, be it round or square. If it is a LONG round slot (with lots of flat) I select it as a round slot, then change to square slot with a big enough radius to keep it on the flats (with some cushion) and measure it using the WIDTH measure option turned on. Now, you can report the slot AS IS using legacy, but the MMC will always come from the width (or 'diameter') of the slot. This is more than fine for automotive as the length of the slot is (99.9999999999999999999999999% of the time) just clearance for assembly of a round bolt. If you need to specifically do it for the length, you create a generic circle, using the slot THEO and the slot measurement, but you use the LENGTH for the diameter calculations.
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