Machinists Gazette

MISCELLANEOUS SHOP SUPPORT => Precision instruments and measuring devices => Topic started by: j.a.f.e. on August 09, 2018, 07:13:35 PM

Title: What is it? Odd Hole Gauge?
Post by: j.a.f.e. on August 09, 2018, 07:13:35 PM
Got this at the swap some time ago it was interesting and inexpensive. Actually I bought it in two rounds the vendor had the middle set as in the photo and the following swap he had the two smaller and two larger barrels. I think it's a bore gauge but it seems a bit awkward because it's a little on the large side. Or maybe it's an inspection gauge. It almost looks shop made but it's extremely well made and chrome plated so if it is someone went to a lot of trouble. There are no markings on any of it. Am I on the right track?

(https://farm2.staticflickr.com/1820/43954639251_6dd14719a8_c.jpg)

(https://farm2.staticflickr.com/1793/30086067238_afcc9a78e0_c.jpg)

(https://farm2.staticflickr.com/1773/29016844247_8aa165a942_c.jpg)

The internal threads are the section on the lower left and are 40TPI. The head has an index mark across the threads which is sort of visible in the image. The hollow ring holds the threaded section in place and the other ring locks the gauge.

(https://farm2.staticflickr.com/1835/43906499032_5739b0bca7_c.jpg)[/url]

The threads just pop in and out of the different barrels.

(https://farm2.staticflickr.com/1776/43049481135_f9b9278709_c.jpg)

The index mark on the ring.

(https://farm1.staticflickr.com/857/43049477435_b4f7fd3b5c_c.jpg)

Shortest possible.

(https://farm2.staticflickr.com/1815/43954644901_453898d47a_c.jpg)

Longest possible.

(https://farm2.staticflickr.com/1819/43954642111_21a68f1a49_c.jpg)

Barrel end.

(https://farm2.staticflickr.com/1834/42146210810_233b37b921_c.jpg)

Movable head end.

(https://farm1.staticflickr.com/940/30086025828_e3c0605621_c.jpg)
Title: Re: What is it? Odd Hole Gauge?
Post by: 4GSR on August 09, 2018, 07:37:40 PM
Look like very nicely home made machinists jacks.
Title: Re: What is it? Odd Hole Gauge?
Post by: j.a.f.e. on August 09, 2018, 07:46:02 PM
That's a possibility I never considered. Thanks for responding.
Title: Re: What is it? Odd Hole Gauge?
Post by: 34_40 on August 09, 2018, 07:55:22 PM
I was thinking they were jacks also.
Title: Re: What is it? Odd Hole Gauge?
Post by: j.a.f.e. on August 09, 2018, 09:21:12 PM
Thank you. I took a closer look at the ends and I think you guys are right.

(https://farm2.staticflickr.com/1827/41528751060_06191caf5e_b.jpg)
Title: Re: What is it? Odd Hole Gauge?
Post by: 4GSR on August 09, 2018, 09:51:44 PM
Good chance, these were made for a specific application, possibly use in a gage lab? 
tool room , maybe in a scientific lab.
Title: Re: What is it? Odd Hole Gauge?
Post by: j.a.f.e. on August 09, 2018, 10:12:40 PM
They came out of a guys estate sale. It's a bit of a puzzle but that's kinda fun too.
Title: Re: What is it? Odd Hole Gauge?
Post by: Carpenter84 on August 09, 2018, 10:24:46 PM
Okay, you gotta get a close-up of the gnurling. It looks pretty damn good.
Title: Re: What is it? Odd Hole Gauge?
Post by: j.a.f.e. on August 09, 2018, 11:07:47 PM
(https://farm2.staticflickr.com/1834/43957414571_4f706f877d_b.jpg)
Title: Re: What is it? Odd Hole Gauge?
Post by: dlane on August 10, 2018, 12:41:49 AM
U sure they didnít come out of a chicks estate sale , they look purple to me   ;D
They do look well made
Title: Re: What is it? Odd Hole Gauge?
Post by: j.a.f.e. on August 10, 2018, 12:55:08 AM
Sometimes the pix come out a bit purple. Probably because of the green background.
Title: Re: What is it? Odd Hole Gauge?
Post by: Carpenter84 on August 10, 2018, 05:36:31 AM
Sigh... I wish my girls were that perfect... Gnurls... GNURLS. 😬
Title: Re: What is it? Odd Hole Gauge?
Post by: chips and more on August 10, 2018, 08:47:18 AM
The ends look domed. I donít think they are used like the jacks we are thinking of, familiar with.
Title: Re: What is it? Odd Hole Gauge?
Post by: j.a.f.e. on August 10, 2018, 09:18:30 AM
The ends are slightly crowned.
Title: Re: What is it? Odd Hole Gauge?
Post by: chips and more on August 10, 2018, 09:59:02 AM
OK then. If nothing else, you could machine the ends flat and use them as jacks.
Title: Re: What is it? Odd Hole Gauge?
Post by: woodchucker on August 10, 2018, 02:20:01 PM
Look like very nicely home made machinists jacks.

That's what I'm thinking.
Title: Re: What is it? Odd Hole Gauge?
Post by: Uglydog on August 12, 2018, 08:13:35 PM
Look like large adjustable end measures to me.
Especially given the domed (crowned) ends.
What are the diameter on the gknurls?
Are they hardened?
If hardened then they are more likely to be some sort of measuring tool.
If not then jacks.
Just my opinion........

Daryl
MN
Title: Re: What is it? Odd Hole Gauge?
Post by: j.a.f.e. on August 13, 2018, 12:43:46 PM
The knurled sections vary a little but average about 0.859. I really can't tell if they are hardened.
Title: Re: What is it? Odd Hole Gauge?
Post by: chips and more on August 13, 2018, 12:55:47 PM
Are they magnetic? With that color. Maybe a purple anodize? Then maybe aluminum? If so, easily machinable
Title: Re: What is it? Odd Hole Gauge?
Post by: j.a.f.e. on August 13, 2018, 03:21:08 PM

They are ferrous and chrome plated. The purplish hue is an artifact of the camera.
Title: Re: What is it? Odd Hole Gauge?
Post by: Terrywerm on August 18, 2018, 09:54:54 AM

They are ferrous and chrome plated. The purplish hue is an artifact of the camera.

At first I thought "No way, those are purple!" but then I looked at the photos again. In the photos with the dial caliper shown, some of them have a purple whatzit as well as a purple dial caliper. But in the photos where the dial caliper is of the correct hue, the whatzit shows as being chrome plated.

I think they were intended to be used as adjustable gauges for measuring internal dimensions, in a fashion similar to telescoping gauges. They would not work well to measure with as getting two sets of fingers into a hole to adjust the gauge out to the hole size would render them useless. The crowned ends lead me to believe that they were not intended for used as jacks, but instead were designed to be set to a specific dimension and then used as go/no go gauges when machining several of the same part.
Title: Re: What is it? Odd Hole Gauge?
Post by: j.a.f.e. on August 19, 2018, 12:19:01 AM
Funny how the comma can change the meaning to the opposite.


At first I thought "No way, those are purple!"

vs

No way those are purple!

They are a bit of an enigma I suppose. Their use is still unknown but so is the origin - are they really well made shop made pieces or commercial? I'm leaning to shop made right now but not for any reason I could defend.
Title: Re: What is it? Odd Hole Gauge?
Post by: 34_40 on August 19, 2018, 07:02:18 AM
They are a bit of an enigma I suppose. Their use is still unknown but so is the origin .

Then I guess they can work for any of the reasons given!  :)

No matter - they were a great purchase! 8)
Title: Re: What is it? Odd Hole Gauge?
Post by: j.a.f.e. on August 19, 2018, 10:45:41 PM
I think the main use will be holding down the felt drawer liner. Probably use them as a go/no go since I think using them as a gauge would be a little awkward.
Title: Re: What is it? Odd Hole Gauge?
Post by: chipwelder on September 05, 2018, 01:44:47 PM
Could also use them to hold a mill vise parallel when clamping a short part.