I think machinists levels are usually adjustable so you can self calibrate them
I think machinists levels are usually adjustable so you can self calibrate them
The Stanley 37 is adjustable — loosen the tapered screws til the vial gets sloppy. Now shim the lands on the low end of the vials with shards of beer can. Drive tapered screws back on and they will press the shims into place. Have mine true to .02 over 24” . Not quite Starrett, but damn good for Stanley! (2 shims trued mine)Yep, they have smaller tighter graduations and you need very specific calibration equipment to set them. I was just thinking this is heavy cast iron so it’d sit flat under its own weight and be less prone to contraction/expansion. Plus if it was old then you’d only need it to set tables/ways and not be super precise like modern ones.