50-B-9412 tool

Manufacturers, configurations, Shovels, Axe, Wrenches, Oiler, F/E etc.
Post Reply
Robin
G-Major General
G-Major General
Posts: 3340
Joined: Tue Dec 17, 2002 5:52 pm
Location: Salem, Oregon

50-B-9412 tool

Post by Robin » Sun Mar 18, 2018 7:34 pm

What is it and where is it used?
Image
Image
Image
41 M3 37mm A/T gun
42 M1A1 75mm pack how
43 MBT trailer
43 WC52
43 WC62
44 Chevy 1.5 ton
44 MZ2 USMC radio Jeep
44 RL35 reel cart
44 K38 trailer
43 K52 trailer
43 M3A4 handcarts(8)
M1942 USMC handcart
M1917 Litter Carrier
M1917 Ammo cart
43 Columbia bike


User avatar
Wingnutt
G-Lieutenant General
G-Lieutenant General
Posts: 5029
Joined: Mon Oct 24, 2011 1:17 pm
Location:

Re: 50-B-9412 tool

Post by Wingnutt » Mon Mar 19, 2018 5:12 am

That looks like some kind of dial test indicator, for machinists, tool and die makers, and inspectors, for clamping on the tool post of a planer, or a lathe, or a milling arbor, etc. Does pressure on the end move the dial? Class 50 is factory apparatuses, so that makes sense. I don't have any Class 50 SNLs or any other SNL that might have Class 50 FSNs.

I'm on my phone for the rest of the day and I can't read what's on the dial. Should be mfgr's name and perhaps model number. Would someone transcribe it? That might be a good clue. Also, what are the measurements? Thousandths of inch?
TEMPORARY DUTY

Robin
G-Major General
G-Major General
Posts: 3340
Joined: Tue Dec 17, 2002 5:52 pm
Location: Salem, Oregon

Re: 50-B-9412 tool

Post by Robin » Mon Mar 19, 2018 6:14 am

Yes, pressure on the end moves the dial.
Image
41 M3 37mm A/T gun
42 M1A1 75mm pack how
43 MBT trailer
43 WC52
43 WC62
44 Chevy 1.5 ton
44 MZ2 USMC radio Jeep
44 RL35 reel cart
44 K38 trailer
43 K52 trailer
43 M3A4 handcarts(8)
M1942 USMC handcart
M1917 Litter Carrier
M1917 Ammo cart
43 Columbia bike

User avatar
Wingnutt
G-Lieutenant General
G-Lieutenant General
Posts: 5029
Joined: Mon Oct 24, 2011 1:17 pm
Location:

Re: 50-B-9412 tool

Post by Wingnutt » Mon Mar 19, 2018 7:33 am

Definitely a dial indicator. Ames still makes them and other precision measuring instruments for machinery. I don't have an explanation for the "B" in the FSN, but that's what it is. That thumbscrew would allow you to position it on different angles as needed to fit a particular work or jig set up. It's used to check a dimension with very small and precise tolerances, then everything would be locked into place and the piece would be milled or planed or turned in quantity. And it would be used to check it. In this case a military machine shop, I guess.

I'm on the road, no access to my library, but I can check later. I don't remember dial indicators in the higher echelon tool-sets, but there might be.
TEMPORARY DUTY

User avatar
d42jeep
G-Brigadier General
G-Brigadier General
Posts: 2290
Joined: Tue Feb 25, 2014 4:06 pm
Location: Albany/Fallen Leaf Lake, CA
Contact:

Re: 50-B-9412 tool

Post by d42jeep » Mon Mar 19, 2018 8:58 am

I wonder if the B might be for bracket since the FSN is on the bracket rather than the dial indicator itself?
-Don
Ford GPW 76344 DOD 11/42 Built in Richmond, CA

User avatar
Wingnutt
G-Lieutenant General
G-Lieutenant General
Posts: 5029
Joined: Mon Oct 24, 2011 1:17 pm
Location:

Re: 50-B-9412 tool

Post by Wingnutt » Mon Mar 19, 2018 1:09 pm

You may be right about that FSN, Don.

Robin,

According to the April 1945 ORD 6 SNL G-27, a "41-I-100, INDICATOR, test, universal, dial-type, with tool holder base, non-swivel body," that came in a wooden box, was issued to every 3rd Echelon Tool-Set No. 1 and 4th Echelon Tool-Set No. 2. Not the same as the one you found, but similar enough to identify it as something similar.

Dial Test Indicator.jpg
Dial Test Indicator.jpg (62.39 KiB) Viewed 904 times
TEMPORARY DUTY

User avatar
JAB
G-General
G-General
Posts: 9586
Joined: Fri Dec 13, 2002 5:25 pm
Location: under the jeep in North Prairie, WI

Re: 50-B-9412 tool

Post by JAB » Mon Mar 19, 2018 5:34 pm

This might help, but for what?

Image

Image

Image
eBay item number: 112825422807
-Jeff

GR8GPN2U!!!

Image

Image

Jeff H
G-Major General
G-Major General
Posts: 3343
Joined: Fri Dec 13, 2002 3:18 pm
Location: NJ

Re: 50-B-9412 tool

Post by Jeff H » Tue Mar 20, 2018 6:42 pm

If that is 50C9410 on the box looks like it crosses to NSN 5220-00-213-9312 if that is of any help.

User avatar
Wingnutt
G-Lieutenant General
G-Lieutenant General
Posts: 5029
Joined: Mon Oct 24, 2011 1:17 pm
Location:

Re: 50-B-9412 tool

Post by Wingnutt » Wed Mar 21, 2018 4:18 am

Good sleuthing, Jeffs! And good to see you guys.

A common failure in a fuel injection system is wear, right? A surface dial test indicator like this would be very useful for measuring variations across a surface to detect wear. Having difficulty imaging how they'd position this. And it seems a little strange to dedicate a dial test indicator to one specific job, but that sure seems to be what the title on the box and the NSN add up to.

Maybe a real mechanic (that's your cue, Don!) can chime in. :)
TEMPORARY DUTY

User avatar
d42jeep
G-Brigadier General
G-Brigadier General
Posts: 2290
Joined: Tue Feb 25, 2014 4:06 pm
Location: Albany/Fallen Leaf Lake, CA
Contact:

Re: 50-B-9412 tool

Post by d42jeep » Wed Mar 21, 2018 7:29 am

I'm certainly no expert on early fuel injection but I do know that the exact time that the fuel is injected is all important and controlled by the injection pump. There were probably very few existing tools for fuel injection during the war so it's not surprising that new items were coming out. Even by 1957 GM's Rochester fuel injection was problematic and was usually removed and carburetors retrofitted. Diesel popularity really contributed to the perfection of direct injection.
-Don
Ford GPW 76344 DOD 11/42 Built in Richmond, CA


Post Reply

Return to “G503 Tools & Equipment (Vehicle & Pioneer)”

Who is online

Users browsing this forum: No registered users and 45 guests