Gage pins

[RJSakowski]

I think you can use an air gage setup to find lobes, taper, barrel, and other errors. My understanding is that gauging small holes is one of those problems in metrology that just doesn't have an easy answer. It's probably possible with a roundness machine, too, but that's mainly for shafts. Also, you've got to give the money tree some TLC. I've heard some of those units have air bearings with TIR under 0.000,005"

True. We had a problem where we needed to verify the cross sectional area of glass capillary tubes that were being made for us. Precision glass capillary tube is made by shrinking the glass around a precision ground mandrel but the spec for the tubing was based on the mandrel spec and there was no guarantee that the glass properly conformed to the mandrel. The solution was to use an air gage. Not a cheap solution.

 

[NCjeeper]

Here is my cabinet.

 

[ChazzC]

Here is my cabinet.
View attachment 499037

At least you know it won’t tip over when you fully extend one of the drawers.

 

[woodchucker]

True. We had a problem where we needed to verify the cross sectional area of glass capillary tubes that were being made for us. Precision glass capillary tube is made by shrinking the glass around a precision ground mandrel but the spec for the tubing was based on the mandrel spec and there was no guarantee that the glass properly conformed to the mandrel. The solution was to use an air gage. Not a cheap solution.

please educate me how an air gauge measures the accuracy of the tube? you don't have to go into depth, just help me to understand what /how it works. Thanks.

 

[RJSakowski]

An air gage consists of a tube with the end terminated with a plug with one or more orifices exiting radially. Compressed air is injected into the tube. The plug fits the bore to be measured closely enough that interference to flow occurs. which causes a change in pressure. Here is a more precise description. https://www.precisetoolco.com/product/mahr-federal-air-gages

 

[ddickey]

I acquired a 1/2" air gage years ago. couldn't give it away. It's in my junk bin now.

 

[ChazzC]

I acquired a 1/2" air gage years ago. couldn't give it away. It's in my junk bin now.

I’ve fallen into that hole, too.

 

[Batmanacw]

Here is my cabinet.
View attachment 499037

Wow! Yeah. I think I'll stick with the boxes they come in. Eventually I might build a set of shelves for the boxes.

 

[Batmanacw]

Ahhhhhh!!! The saga of the gage pins is complete. Feels great. I'll continue to nerd out each time I use them for the rest of my life.



Top shelf has my gage blocks and gage balls too.

 

[ChazzC]

Ahhhhhh!!! The saga of the gage pins is complete. Feels great. I'll continue to nerd out each time I use them for the rest of my life.

View attachment 499718

Top shelf has my gage blocks and gage balls too.

No round gage blocks or metric blocks & pins???