Today's tool find? What is this mystery Starret thing?

[Bentworker]

Today's random find.

Ever seen rules this short?

How do you use number 2? Helios made in Germany.
What is number 3? It is marked Starret.

[BadDog]

Yes, the small rules are not too uncommon, but certainly less so than the 6". Very handy with obstructions and tight spaces.

I can't see it very well, but I think 1 might be a bore rule. You read the diameter by how far it goes through the hole. If that's what it is, then it takes a whole set and clear through bores to have much utility. But that may not even be what it is.
Edit: Blowing it up and looking closer, I think I'm wrong based on the graduations. But very odd that the final increment denotes "4 mm". Other than that, I got nothing...

Number 2 is an angle gage. Similar to a "fish" gage used for threading tools, but for various angles using the multiple gage surfaces. Again, takes a set to have much general purpose value.
Edit: Again, after blowing it up, it does appear to be a thread gage rather than an angle gage as I first thought. ACME? Not sure.

Number 3 looks like an adapter that comes with DTI kits for mounting DTIs in a lathe tool block/post, or vise, or whatever.

[John Evans]

OK # 1 is a Starrett #270 taper gage precision taper from .010 to.150 back side is in MM.
2 is a ACME 29* thread gage notches on side are for grinding tool for various pitches.Starrett # would be a #284
3 is as Baddog said part of a DTI or dial indicator set.

[spro]

Gee. You guyz is quick.

[Bentworker]

Excellent.

Well, now I know what this stuff is!

[John Hasler]

I could have used one of those rules yesterday.

[pete]

I've got a brand new set of the Starrett taper hole gauges. They work extremely well if your tollerences are + - a couple of thou. #2 is an ACME thread gauge. Unfortunately I think 10 tpi is the highest thread pitch they go. At least mine only goes to that. #3 looks to be part of an indicator holding assembly but I'm possibly wrong about that.

[Bentworker]

The Starrett 270 is really cool. The 8 year old was using it to measure the distance between fork tines.

[mcostello]

Encourage the 8 year old, We all started somewhere, and, a fork is probably My favorite tool.

[SteveM]

The Starrett 270 is really cool. The 8 year old was using it to measure the distance between fork tines.

Good for measuring guitar string height.

The short rulers are used with a handle so that you can reach the ruler into tight spaces you can see into, but you can't get your fingers into.

Steve

[Harold_V]

Number 2 is an angle gage. Similar to a "fish" gage used for threading tools, but for various angles using the multiple gage surfaces. Again, takes a set to have much general purpose value.

It's a gauge used for grinding (and orienting) Acme threading tools. While the angle is a constant, the width is not, so the gauge provides a slot of proper width for common pitches. A set is not required, as the tool is complete as is.

H

[earlgo]

SteveM is correct about the short scales. Starrett has #423 in their catalog.
http://www.starrett.com/metrology/product-detail/S423Z
Wish I had one.
--earlgo