Least Count

[jigars]

What is the least count of CMM Machines?
Does it varies from machine to machine? we have Global Advantage 15.30.10.

[Schlag]

A what ?

[jigars]

i wanted to know what is the smallest length we can measure in CMM

[R2ah1ze1l]

15 = X axis width (1.5meter)
30 = Y axis length (3.0meter)
10 = Z axis depth (1.0meter)

Is that what you are asking about?

[jigars]

not exactly
i wanted to know what is the smallest length we can measure in CMM

[Matthew D. Hoedeman]

I have a Global, down to around 0.0002", but that should be taken with a grain of salt as they say. Lots of factors to take into account for the accuracy of the machine.

[VinniUSMC]

"i wanted to know what is the smallest length we can measure in CMM"

Accurately? That's up to your CMM, calibration, probing system, hardware, probe qualification, etc. Probably somewhere on the order of 0.010 to 0.020mm. I think you'd need a microscope at that point though, so why don't you tell us, what are you trying to measure?

Theoretically? PC-DMIS can display up to 6 or 7 decimal places, giving 0.0000001mm. But, that's just ridiculous.

[jigars]

I need it for documentation purpose

[Matthew D. Hoedeman]

all that info should be in the documentation that came with the machine and include your annual calibration

[VinniUSMC]

Then, I don't understand the question. The smallest length that can be measured is beyond the practical applicability of the CMM (any CMM).

Point repeatability? Volumetric accuracy? Precision? Your question doesn't really make sense. I think it is a mix up in translation.

[KIRBSTER269]

I won't even answer this question, because my mind is in the gutter.

[VinniUSMC]

KIRBSTER269 That's never stopped you before. If it ever stopped me, I'd never answer a question... lol

[R2ah1ze1l]

I mean, you can measure something as small as a spec of dirt, just not sure the point of that.

Your limitations are defined mathematically in the literature that was supplied with the machine, and your imagination. This Forum is a great place to help when you find a sticky spot, but hypotheticals are a rabbits hole...

[AndersI]

I mean, you can measure something as small as a spec of dirt,

A visible speck of dirt is much larger than what you can reliably measure...