I use a bridgeport with a DRO to measure stuff like that. Use an indicator and tram each hole, if they are threaded, put an allen head bolt in the threaded hole and measure the head.
You probably won't have enough travel if you use a BP or similar knee mill, locate off of the crank pilot, measure everything you can, flip it over and measure everything else, measure a couple of them twice so you can match it up when you do your CAD work.
It's a PITA, but it's easy, if you have a mill with a DRO anyway.
MC |