Aluminum galling on thread plug gauge

#1
I have a 5/16-24, 3B, STI thread plug Go member that has light aluminum galling on the first two threads.
The aluminum is either 6061 or 7075. The gauge is 60-62Rc
Anyone have a good idea how to remove the galling.

Thank you.
 
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ScottK

Not out of the crisis
Staff member
Super Moderator
#2
That's not something I would do in house. I'd send it out to my calibration guy for a repair and calibration check.
But to prevent it in the future have you considered using a light lubricant?
 
#3
I dip each gauge in Way Lube after cleaning, visual inspection and checking diameters and PD's, after each use.

Sending out the Go Member for repair and calibration would cost less than a new Go Member?

Usually if a small gauge is galled it gets replaced with a new one. An inspector told me too much plating in the tapped hole as the reason why it was galled. Maybe he gets a Tin coated one next time.

I admit I took the member home last night for an experiment. I placed the member in Gallium for about an hour. It appears the aluminum was just starting to be removed. I checked the Pitch Diameters this morning and appear to have no change. Not so sure about the integrity of the steel.
I thought the Gallium would work faster. I'll try some more tonight.
 
Last edited:

Mike S.

Happy to be Alive
Trusted Information Resource
#4
I have had similar problems in the past. While we went through some problems with a supplier we would sometimes get the plug gages stuck and have to scrap them. We used isopropyl alcohol as a lubricant which helped some. If loose particles got on the gage we would use a toothbrush and alcohol bath to clean them, but once galled I agree with Scott - have it checked or scrap it.
 

ScottK

Not out of the crisis
Staff member
Super Moderator
#5
I dip each gauge in Way Lube after cleaning, visual inspection and checking diameters and PD's, after each use.

Sending out the Go Member for repair and calibration would cost less than a new Go Member?
Not sure what Go Member is...
I have a local metrology supplier I use that has a calibration lab when issues like this crop up.
 
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