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Shurafa

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Laser Alignment Calibration

Hello fellows.

I wonder about the test procedure manufacturers follow to calibrate laser alignment units. What are the typical scopes and acceptance criterias for the typical models (e.g. shaft, bore)?

I had a few discussions (not sure I mentioned this here before) about if the main unit really requires a calibration like the sender-receiver parts do. Maybe there is a conceptual difference in calibrating between the cases of vibration units and shaft alignment units.

Interested in hearing from you.

Regards- Ali M. Al-Shurafa
Noknroll

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Reply with quote  #2 
I dont think my method would be called calibration, maybe more of a function test.
I mount the heads on a length of pipe in a lathe chuck, turn by hand and hopefully get a bullseye with 0.00 mm shim adjustment horizontal and vertical
Shurafa

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Quote:
Originally Posted by Noknroll
I dont think my method would be called calibration, maybe more of a function test.
I mount the heads on a length of pipe in a lathe chuck, turn by hand and hopefully get a bullseye with 0.00 mm shim adjustment horizontal and vertical


In my world, function tests are essential for most of our measurement systems. I would be interested to learn more about your test if you can elaborate.

My primary question is related to a formal lab accuracy verification tests and error corrections.
fburgos

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Quote:
Originally Posted by Noknroll
I dont think my method would be called calibration, maybe more of a function test.
I mount the heads on a length of pipe in a lathe chuck, turn by hand and hopefully get a bullseye with 0.00 mm shim adjustment horizontal and vertical


the manufacturer of my system call it straight bar test, I do it all the time not even on a lathe just rolling the pipe on the air
Danny Harvey

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Reply with quote  #5 
I've heard of doing it this way and considered it but don't you need a traceable standard for a certificate?

I've adjusted my belt alignment tool using a level and a flat spot but I've never had any certification requirements applied to that device.
fburgos

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Reply with quote  #6 
Danny you are right.

If tracability and certification is needed go to vendor, if not needed I would settle with a operability check.

My certificate have some graphics max and average error and something about "interferometer was calibrated against an iodine stabilized laser with a vacuum wavelengt and frequency that are traceable to the national physical laboratory UK.... and some other serial
Shurafa

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Reply with quote  #7 
How about the main unit? What kind of calibration is there for it? 

In my opinion, it is like a calculator where there is a little meaning for calibrating a calculator.

Regards- Ali M. Al-Shurafa 
fburgos

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agree, I believe calibration is a misleading name, the name should be certification/assessment of functionality.
RustyCas

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Reply with quote  #9 
I have 3 Optalign Plus's and I just check them against each other when I'm on a job somewhere.  I don't need 3 though, so if you're looking for one...
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ivibr8

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Reply with quote  #10 
Rusty
This is a shot in the dark but I also have an Optalign Plus and I am missing the red plastic bullsye (for rough alignment) on the receiver.
It is P/N ALI 5.115 Reflector Dust Cap.

Vendor wants almost $50 for a new one. I'm not a cheap engineer but I have a hard time believing it costs more than $2.00 to make.

By chance, you don't have an extra one lying around do you?

Jim P
RustyCas

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Reply with quote  #11 
Jim, pretty sure I do. Will take me a day or two to find.  Also have extra rods, magnetic brackets, etc if you need any.


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fburgos

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Reply with quote  #12 
I also fell that all vendors are ripping off, a small plastic cap looks cheap because we all know how cheap plastic is, but the manufacturing process needs custom made mould, the cost is divided on the number of final products, several thousand (cheap item) or a couple of hundred (expensive item).

never the less they inflate prices with custom cabling, battery packs, etc. so you have to buy from them.


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