Gauge R&R of automeasuring machine for checking the crankshaft diameters

  • Thread starter prasadshirodkar1976
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prasadshirodkar1976

#1
We have auto measuring machine for checking the cranshaft diameters. the machine is PLC programmed & checking done by digitela micrometers by robots.

kindly tell me the procedure for checking gauge R&R.

as per my view--in above case Av will become zero. so the R&R =EV but is Pv is considered as measured parts varitaion then it is also coming very less(towards zero). so the TV value is almost getting equal to R&R. so when u are are calculating gauge %R&R/TV it tends to 100% which is not good.

but if the Pv is considered as full tolerance of the component dimension. then it satisfies the below 10% condition for %R&R/TV value.

pl tell me right procedure.

prasad
 
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Miner

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#2
The answer to this is based on the purpose of the gage itself.

Case 1) If the purpose of the gage is solely to inspect the parts to tolerance, use the P/T Ratio, which is based on the tolerance.

Case 2) If the purpose of the gage is to measure the parts to collect data for SPC (or other statistical purposes), you must use the %GRR formula, which is based on PV where PV is the Process Variation as seen with a capability study of the process is a state of control.

In your application, does the equipment react to the measured results to automatically adjust the process? Use Case 2.

Does the equipment simply sort the product into Pass/Fail groups? Use Case 1.

If the application is more complex that this, please provide more information.
 
P

prasadshirodkar1976

#3
miner thanks for reply.
but as i told u the Pv value calculated by formula by using j factor is very small. so the Tv is coming almost equal to R&R.
so if checked for %R&R/TV its very high value.
if u allow i can send u excell sheet of calculations
can u pl tell me. when %R&R on Tv ot Tt is checked.

what is P/T ratio
 

Miner

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#4
Please attach the data to your next post, including the tolerances used.

I do need to know whether the gage is used only for Pass/Fail inspection or if it is used for SPC. This will make a big difference in the analysis and conclusions about gage suitability.

P/T ratio compares the R&R variation to the tolerance instead of comparing it to the process variation. If is used to assess the gage for suitability for inspection. %GRR is used to assess the gage for suitability as a process control device.
 
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