UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > Components and Circuits

Notices

Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

Reply
 
Thread Tools
Old 16th Apr 2024, 6:20 pm   #1
Studio263
Octode
 
Studio263's Avatar
 
Join Date: Apr 2007
Location: Hampshire, UK.
Posts: 1,578
Default Mystery object - what is this?

I found this (see photos) while I was sorting through some stuff. I've got now idea what it is or what it was used for, although it was clearly a precise and delicate thing as it was packed in its own foam lined wooden box (box still there, foam now just yellow dust in the bottom).

It is made of anodised metal which has been machined on all surfaces. The outer diameter is about 105mm and the shaft in the middle is 6mm. The pin with the knurled knob on it is removable, it is 5mm in diameter.

There is a spirit level in the middle which has been carefully set at an angle. The shape underneath it seems to allow for some adjustment and the screws that hold it have be sealed in position.

Who would need a very carefully made and very flat disc with a wonky level on it? I've worked on machine tools but I've never seen anything like this - any ideas?
Attached Thumbnails
Click image for larger version

Name:	mystery object 1.jpg
Views:	385
Size:	44.2 KB
ID:	296446   Click image for larger version

Name:	mystery object 2.jpg
Views:	329
Size:	42.8 KB
ID:	296447   Click image for larger version

Name:	mystery object 3.jpg
Views:	315
Size:	35.8 KB
ID:	296448  
Studio263 is offline   Reply With Quote
Old 16th Apr 2024, 7:59 pm   #2
The Philpott
Dekatron
 
The Philpott's Avatar
 
Join Date: Aug 2016
Location: Colchester, Essex, UK.
Posts: 4,124
Default Re: Mystery object - what is this?

OK, so it's not from a microscope....now i've moved onto armaments, bombsights or high tech camera equipment.

Dave
The Philpott is offline   Reply With Quote
Old 16th Apr 2024, 8:18 pm   #3
stevehertz
Dekatron
 
stevehertz's Avatar
 
Join Date: Sep 2011
Location: Rugeley, Staffordshire, UK.
Posts: 8,863
Default Re: Mystery object - what is this?

It's to set the rotating disc horizontal on a video machine.
__________________
A digital radio is the latest thing, but a vintage wireless is forever..
stevehertz is offline   Reply With Quote
Old 18th Apr 2024, 9:25 am   #4
toprepairman
Tetrode
 
Join Date: Jun 2021
Location: Leatherhead, Surrey, UK.
Posts: 77
Default Re: Mystery object - what is this?

Why would that be necessary?
toprepairman is offline   Reply With Quote
Old 18th Apr 2024, 10:28 am   #5
bigfathairyvika
Hexode
 
bigfathairyvika's Avatar
 
Join Date: Nov 2009
Location: Cambridge, Cambridgeshire, UK.
Posts: 498
Default Re: Mystery object - what is this?

Would I be correct in saying video tape scan heads are mounted at an angle?
Pretty sure I remember VHS heads rotating such that the recording was in diagonal lines across the tape.
bigfathairyvika is offline   Reply With Quote
Old 18th Apr 2024, 1:41 pm   #6
Studio263
Octode
 
Studio263's Avatar
 
Join Date: Apr 2007
Location: Hampshire, UK.
Posts: 1,578
Default Re: Mystery object - what is this?

Quote:
Originally Posted by toprepairman View Post
Why would that be necessary?
I was going to ask the same thing. Video heads only need to be inclined in respect to the tape path, not some arbitary reference plane outside the machine (e.g. gravity...). To use this tool to measure that you would first have to level the chassis of the video machine using another (presumably much larger and more complicated and accurate) tool.

So I'm pretty sure it isn't to do with video recorders.
Studio263 is offline   Reply With Quote
Old 18th Apr 2024, 3:33 pm   #7
Radio Wrangler
Moderator
 
Radio Wrangler's Avatar
 
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 23,009
Default Re: Mystery object - what is this?

Landscape photographers use levels for their tripods, but level levels, not wonky ones.

That probably rules out photography.

If the wonkiness has a well defined angle, it could give a clue, like three degrees for a glideslope.

David
__________________
Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
Radio Wrangler is online now   Reply With Quote
Old 18th Apr 2024, 5:14 pm   #8
stevehertz
Dekatron
 
stevehertz's Avatar
 
Join Date: Sep 2011
Location: Rugeley, Staffordshire, UK.
Posts: 8,863
Default Re: Mystery object - what is this?

Quote:
Originally Posted by toprepairman View Post
Why would that be necessary?
Good point but I'm pretty sure it is something to do with 'leveling' the disc or its mounting table on a video machine. When I was big into Philips N1700 machines I acquired a large amount of rare factory set up jigs and tools for them. I think Gordon Bussey got them for me as they were no longer using them at Philips. So anyway, yes I had something that looked just like that and it was for use on N1700 video machines. On that third photo you can see that the centre part is 'cranked' just like the head disc on a video machine.
__________________
A digital radio is the latest thing, but a vintage wireless is forever..
stevehertz is offline   Reply With Quote
Old 22nd Apr 2024, 9:13 am   #9
ScottBouch
Octode
 
ScottBouch's Avatar
 
Join Date: Feb 2013
Location: Leicestershire, UK.
Posts: 1,138
Default Re: Mystery object - what is this?

On the second photo you can see three raised bosses/pads around the perimeter, looks like these were to make contact with the 'object' being aligned, while the centre pin held it in place, and the offset pin set the relative rotational angle. Presumably the 'object' would have one (or more) offset hole for the offset pin to locate into.

But with the offset pin having a knurled section, it looks like it may be spring loaded or have a means of fitting removing it? Could the 'object' have a selection of offset holes for this pin to go between?

Cheers, Scott
__________________
www.scottbouch.com
ScottBouch is online now   Reply With Quote
Old 22nd Apr 2024, 12:47 pm   #10
toprepairman
Tetrode
 
Join Date: Jun 2021
Location: Leatherhead, Surrey, UK.
Posts: 77
Default Re: Mystery object - what is this?

Back in the day I used to service video machines, VHS, Beta, Umatic and even 1" C format and there was never any need to reference to gravity. Granted never had to work on N1700's thankfully but really don't see any connection there. However can't claim to know everything so I'm prepared to be surprised.
toprepairman is offline   Reply With Quote
Old 28th Apr 2024, 6:28 pm   #11
Mooly
Octode
 
Join Date: May 2011
Location: Lancashire, UK.
Posts: 1,354
Default Re: Mystery object - what is this?

Totally random thought. Could it be anything related to setting up a spectrometer?

There seem to be weird and wonderful jigs around for that.

https://www.ms-museum.org/source-alignment-jig
Attached Thumbnails
Click image for larger version

Name:	Screenshot 2024-04-28 182814.jpg
Views:	48
Size:	16.5 KB
ID:	296953  
Mooly is offline   Reply With Quote
Reply

Thread Tools



All times are GMT +1. The time now is 4:52 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.