Hone relief 12" deep-what to use

[[Li...]]

We will be making this very soon.  It has a main bore that it is Ø2.250±.002"  At the bottom of the bore is a hone relief diameter of Ø2.31±.020 and max depth /width of .20"

This is not going to be inspected on a CMM. Manufacturing is looking for a handheld gage that can inspect the ID. We may have something for the depth. 

Does anyone know of gages for checking hone reliefs?  Please see the attached. 

I know that there are various types of bore gages, but I don't think that's the right type of gage for such a small diameter landing.  We're going to need to get all the way down the bore to get the ID.  Telescoping gages are a bit too big, the spring-loaded pins are about .225"

 

Lincoln

12IN DEEP HONE RELIEF ID.xlsx

[[Je...]]

I believe they are called "inreach gages" by Mueller and work well for in-place inspection.  Bore gages work for this but are difficult to get to the bottom of a bore of that size/depth ratio.  Not promoting them, just making you aware as they are an obscure gage that many are unaware of.  Use this while the part is in-place on the machine then take to inspection and measure using a VAST sensor and special stylus setup

 

[[Pa...]]

We use these Mueller gages all the time.  I'm not the biggest fan, but that's because we typically have 1/10 that tolerance.  Be prepared to work with a sales rep who appears to be awake and coherent.  There are at least 4 components in the Mueller (top plate, bottom plate, gage body, and indicator) that need to work together for your measurement.  Get one of them wrong and you're stuck waiting for the right one.  These don't have a large measuring range.

Mitutoyo also offers a "bottoming" bore gage that works AWESOME if you need accuracy, or if you're measuring the DOD part in front of me with a hone taper at the bottom of a 400" deep bore.  I'd share pics but then the black vans would come for me.

Both of these gages will stay off the bottom by a little bit; the Mueller gage is about .050", Mitu is more like .025".