RLamparter
Hot Rolled
- Joined
- Oct 4, 2008
- Location
- Central PA
I picked up a Starrett Digi-Chek 258 height gage that's waaaay out of calibration. Someone must have messed with it and that probably explains why it was sold so inexpensively. I missed the burrs on the four slot screw holding the top of the micrometer barrel, a sure sign that somebody's done something. Be that as it may. It's out of adjustment.
The bottom of the stack rests on the top of the surface plate long before I can lower the 1" step to match a 1" gage block. I assume this gage cannot actually give a 1.0000'' reading and starts at somewhere over 1". Is that correct?
I'm assuming you'd have to set the calibration with a 2" gage block, so here are the readings when the 2" step is zeroed on a 2" gage block. The digits read .008 and the micrometer top reads .9622
I'd like to hear from someone who's more familiar with these than I am even if it's a Cadillac or a Mitutoyo or some other similar gage. I can spot two areas that might be places for adjustment. The feet are screwed into the base. They're currently bottomed out in their holes, so would only serve if the gage stack needed to be raised. My guess is that these are not for calibration, but only to adjust squareness of the gage. There also may be an adjustment on the rear of the stack where it attaches to the micrometer stem as seen in the photo below. I'll probably also need to get to the area with the digital mechanism but haven't carefully looked for ways to do that yet. How do you adjust these? By any chance does someone actually have a parts breakdown?
The bottom of the stack rests on the top of the surface plate long before I can lower the 1" step to match a 1" gage block. I assume this gage cannot actually give a 1.0000'' reading and starts at somewhere over 1". Is that correct?
I'm assuming you'd have to set the calibration with a 2" gage block, so here are the readings when the 2" step is zeroed on a 2" gage block. The digits read .008 and the micrometer top reads .9622
I'd like to hear from someone who's more familiar with these than I am even if it's a Cadillac or a Mitutoyo or some other similar gage. I can spot two areas that might be places for adjustment. The feet are screwed into the base. They're currently bottomed out in their holes, so would only serve if the gage stack needed to be raised. My guess is that these are not for calibration, but only to adjust squareness of the gage. There also may be an adjustment on the rear of the stack where it attaches to the micrometer stem as seen in the photo below. I'll probably also need to get to the area with the digital mechanism but haven't carefully looked for ways to do that yet. How do you adjust these? By any chance does someone actually have a parts breakdown?