I have just joined the MSA forum as a new member.

I would like to get some information on how to conduct and MSA on mechanical torque wrenches. We use these torque wrenches to tighten the busbars in 12 KV switchboards. A busbar tightened to required torque ensures good electrical contact.

The torque wrenches are mentioned in our control plan for the 12 KV switchbaords. So we need to do a Gage R&R.

If anybody can provide me a previously existing MSA study or provide the step by step instructions, it would be greatly appreciated.

Thanks a lot!!

I'm seeking any information anyone has on performing a gage R&R on torque wrenches as well. This was an issue during our TS surv. audit last week.

Most torque wrenches/drivers are not gauges, but a process. Perform a capability study on a process.

A torque analyzer is a gauge that you can evaluate using an MSA.

The only situation where you can justify performing an MSA on a torque wrench (not a torque driver) is where it is used to measure break-away torque, or the torque required to continue to tighten. This would require a destructive MSA. Preparation of sample parts would be critical to the results.

Any destructive test we may use the below format to help us.......

1. ensure each part of the samples collected close to identical and independent.
2. may use Minitab ver 15 on GRR nested
3. make sure the method of the process is standardized
:biglaugh:

Most torque wrenches/drivers are not gauges, but a process. Perform a capability study on a process.

A torque analyzer is a gauge that you can evaluate using an MSA.

The only situation where you can justify performing an MSA on a torque wrench (not a torque driver) is where it is used to measure break-away torque, or the torque required to continue to tighten. This would require a destructive MSA. Preparation of sample parts would be critical to the results.

Thank you so much for your post, Miner, clarifying this issue.

Too many people have been forced to rush off on a wild goose chase because the CB auditor has issued such a finding - because they don't know what they're talking about. I hope many people read this one post and have the knowledge to push back on these nonsense nc's.

Thanks, again.:agree1:

These are some of our previous discussions on this topic.

Torque wrenches and drivers - How to perform MSA (measurement system analysis) (http://elsmar.com/Forums/showthread.php?t=14886&highlight=msa+torque+wrench)
GR&R on Torque Wrenches - Seeking Example (http://elsmar.com/Forums/showthread.php?t=13351&highlight=msa+torque+wrench)
APQP, Gage R&R, MSA HOW? Maintenance? (http://elsmar.com/Forums/showthread.php?t=7038&highlight=msa+torque+wrench)
MSA - Torque Wrenches - Statistical studies that cover requirements of MSA (http://elsmar.com/Forums/showthread.php?t=6060&highlight=msa+torque+wrench)
MSA (Measurement System Analysis) on Torque Wrench (http://elsmar.com/Forums/showthread.php?t=1172&highlight=msa+torque+wrench)