There was a heap of metrology stuff went at a Grays Auction recently.. I picked up a few bits and pieces..
I got a Tesa electronic gage, and probes, Out of 5 probes ( spread over 2 lots) 2 of the probes were crook, and 3 are good, one was brand new.
I also got a battery powered Tesa Inductive probe meter, but I don't have a picture of it, I'll put it up later. This is the mains powered one.
The most sensitive range is 3 microns full scale, and you can switch to 300 microns full scale. The probe is an inductive type, and is basically an LVDT. The case is heavy cast aluminium.
If you like things in imperial, then switch to 0.1 range on the lower right switch, then the red scale reads from 0 to 100 millionths.
The other thing I picked up was a monochromatic light source and some optical flats, and a set of gage blocks
The Light source is pretty much the standard sodium vapour light source, which is 575 nano meters, and so the 1/4 wave fringes are 144 nano meters. (0.144 microns)
The monochromatic light source, and the set of gage blocks, they look like a well kept set of inspection grade gage blocks. None missing, and first inspection I think they are in good nick.
The optical flats cam in a box of 4, and I think they are micrometer flats. Used to check micrometer anvils?
1.. Two wear slips 2. flats together
3. One wear slip 4. two wear slips
I'm still working out the subtlety of measuring the fringes, but first thing to know is that if the fringes are parallel, (and evenly spaced) then the object is flat.. albeit not parallel, the fringes are 0.144 microns apart.
The spacing between the fringes tells you how close to parallel the two surfaces are.
So... there's two new ( to me anyway ) ways of measuring very accurately.. Tesa inductive probes, and optical flats.
Ray
I got a Tesa electronic gage, and probes, Out of 5 probes ( spread over 2 lots) 2 of the probes were crook, and 3 are good, one was brand new.
I also got a battery powered Tesa Inductive probe meter, but I don't have a picture of it, I'll put it up later. This is the mains powered one.
The most sensitive range is 3 microns full scale, and you can switch to 300 microns full scale. The probe is an inductive type, and is basically an LVDT. The case is heavy cast aluminium.
If you like things in imperial, then switch to 0.1 range on the lower right switch, then the red scale reads from 0 to 100 millionths.
The other thing I picked up was a monochromatic light source and some optical flats, and a set of gage blocks
The Light source is pretty much the standard sodium vapour light source, which is 575 nano meters, and so the 1/4 wave fringes are 144 nano meters. (0.144 microns)
The monochromatic light source, and the set of gage blocks, they look like a well kept set of inspection grade gage blocks. None missing, and first inspection I think they are in good nick.
The optical flats cam in a box of 4, and I think they are micrometer flats. Used to check micrometer anvils?
1.. Two wear slips 2. flats together
3. One wear slip 4. two wear slips
I'm still working out the subtlety of measuring the fringes, but first thing to know is that if the fringes are parallel, (and evenly spaced) then the object is flat.. albeit not parallel, the fringes are 0.144 microns apart.
The spacing between the fringes tells you how close to parallel the two surfaces are.
So... there's two new ( to me anyway ) ways of measuring very accurately.. Tesa inductive probes, and optical flats.
Ray
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