1st Gage R&R Results help

SteelMaiden

Super Moderator
Super Moderator
#31
The last division I worked at had a laser mic that measured up to 4" I do believe that the name of the supplier was Lasermike Inc. (it was a while ago, so my memory is a little rusty) I don't have any sort of affiliation with them, just used the one piece of equipment, I was in charge of in-house calibrations at the time.
 
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J

justncredible

#32
I am looking into laser mics, and I can only find a few that only go up to 2.56" ( http://www.keyence.com/products/vision/micrometer/micrometer.php ) , Do you have to have custom laser mics made up if you want to measure larger parts. We have a lot of parts from 1-3", and some from 3-4", which really struggles with Gage RR because a 3-4" mic is hard to handle.


Thanks
Call them, they will demo a unit. Also I am sure they go up to 8 inches or more. They have dual head units. Is a free demo, and they will loan it out for a few weeks.

Also have you looked into the marposs stuff?



http://www.marposs.com/site/theproduct.asp

We had some marposs units on our machines, center grinders. You will have to call them to.

I am not affilated with either company.

http://www.marposs.com/site/family....0-->GAUGING AND CONTROL FOR GRINDING MACHINES

found what we used, it is the unit in the picture.
 
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C

CMfgT

#34
Well I just got off the phone with a laser mic rep and the laser mics have the same resolution our hand mics do (0.000010" or 0.000015") I know the laser mic will be more repeatable than a hand mic, but the resolution will still hurt use in a gage RR right? I know my operators vary 4 tenths on the same part with the hand mic. I just don't know if the cost of 10K or more would be worth the expense.:bonk:
 

SteelMaiden

Super Moderator
Super Moderator
#35
it all depends on what your "real" tolerance requirements are. If you only need to measure to the nearest Thou, 0.000010" is more than enough accuracy. Your gage R&R should be based on the tolerance required by the specs you are working to, not the measuring tolerance.
 

bobdoering

Stop X-bar/R Madness!!
Trusted Information Resource
#36
Well I just got off the phone with a laser mic rep and the laser mics have the same resolution our hand mics do (0.000010" or 0.000015") I know the laser mic will be more repeatable than a hand mic, but the resolution will still hurt use in a gage RR right? I know my operators vary 4 tenths on the same part with the hand mic. I just don't know if the cost of 10K or more would be worth the expense.:bonk:
I thought you said the digital mics had .0005 resolution, so .000010" should be much better resolution. The other issue is the influence of the operator on the repeatability. Laser mics remove all issues with gage pressure error and bias, so that helps quite a bit. I would recommend looking at Western air gages, though. They are not as universal, but they are less expensive. :cool:
 
C

CMfgT

#37
Our mic resolution is
0.00000 or .00005

so we have the tenths 0-9 but the next decimal place is 0 or a 5, basically we need to measure to the tenths, but can not follow the 10 to 1 rule because the next decimal place is either a 0 or a 5

sorry for the typo/confusion
 
J

justncredible

#38
Indicator mics do read to 50 millionths, but that is all. The laser mics are accurate to within 40 millionths and read to the 1 millionth.

So indicator mic read .00005

laser reads .000001 and is accurate to .00004

It gives you 1-9 numbers in the 10 millionths place. The indicator mic gives you a 50 only.

Get a demo unit and do a R&R on it. You should be able to pass ±.0001.
 

bobdoering

Stop X-bar/R Madness!!
Trusted Information Resource
#39
Your gage R&R should be based on the tolerance required by the specs you are working to, not the measuring tolerance.
Better yet, they should be evaluated to your control limits. Ideally, you chould have an ndc (calculated using control limits rather than tolerance) > 10 for statistical process control. :cool:
 
C

CMfgT

#40
Indicator mics do read to 50 millionths, but that is all. The laser mics are accurate to within 40 millionths and read to the 1 millionth.

So indicator mic read .00005

laser reads .000001 and is accurate to .00004

It gives you 1-9 numbers in the 10 millionths place. The indicator mic gives you a 50 only.

Get a demo unit and do a R&R on it. You should be able to pass ±.0001.

I talked to a rep at Keyence and their laser mics to go .00005", and said you cannot go any further without being in a lab setting. Am I getting a sales pitch or the truth. Does anyone have a laser mic that goes to "laser reads .000001 and is accurate to .00004"

Thanks
 
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