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11
The Water Cooler / Re: What's the deal with Clockwork Square Dimples?
« Last post by philf on September 11, 2021, 03:04:46 PM »
I found this on a clock and watch forum which more-or-less confirms Andrew's flattening theory:

"The process was called "Planieren" (planing, grading) and was used to roughen the plates
and relieve tension. Junghans applied for a patent in Germany in 1930 and actually received a Swiss
patent (152302) Jan. 31, 1932.
Starting with alarm clock movements, the dotted plates became more and more typical for Junghans after 1930,
depending on the movement.
The machines used for the process spared out drilled holes and bushings automatically, so that these would not
have been narrowed down or closed by the planing.

Source: "Uhrzeiten - Innovationen in Technik und Design" 2011 by Stadtmuseum Schramberg, Lixfeld & Raststätter, ff.

The German patent is DRP 529786, published July 1931."
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The Water Cooler / Re: What's the deal with Clockwork Square Dimples?
« Last post by S. Heslop on September 11, 2021, 01:50:48 PM »
I'd always though it was to restore flatness after previous manufacturing operations.

I took as close-up a photo as the phone could manage and...



It's hard to tell if stuff was dimpled before of after the stamping, for me at least. But there is some metal deformed out around that big hole, at about the 11 and 5 positions. So it does seem like it was dimpled after stamping, and that'd explain why.

Although now i'm wondering what you'd even call such a machine.
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Our Shop / Re: My week this week, my workshop videos!
« Last post by hermetic on September 11, 2021, 01:27:01 PM »
Fordson E1A major rebuild Part 17 strip and rebuild of the front steering and kingpins (steering swivels) It is not pretty, but all is repairable! luckily the parts I do need are all available, and not expensive, which is amazing for a 1955 tractor!! Part 18, out now at you tube, phil whitley or google "my week this week"
Phil, In humid and hot East Yorkshire!!
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The Water Cooler / Re: What's the deal with Clockwork Square Dimples?
« Last post by awemawson on September 11, 2021, 01:15:11 PM »
I'd always though it was to restore flatness after previous manufacturing operations.
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The Water Cooler / Re: What's the deal with Clockwork Square Dimples?
« Last post by Sea.dog on September 11, 2021, 09:35:34 AM »
I have an idea that it might be to add stiffness to the plate. I seem to recall reading something to that effect many years ago. I could, of course, be talking complete bollocks  :D
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on September 11, 2021, 08:29:01 AM »
As expected, soldering jumpers to the centre row (B) of the DIN4161 connector was a nightmare. Poking a soldering iron down between the pins inevitably scorched the  insulation of previously soldered wires. I thought perhaps I could use PTFE insulated wire - I have some the right size, but frankly I've never been able to satisfactorily strip the insulation neatly and to correct length - it always ends up a mess.

Then I thought, if I can find a crimp version of the connector, I can put it on pigtails off the board and solve the issue. Sure enough, Harting part number 09230483217 is the right part - but it's on a ten week lead time from all the normal UK suppliers so that rules that out!

OK the socket that I have has solder tails intended for a PCB, BUT 16 way female socket headers fit them rather nicely - three of those and I have a hopefully working solution. Solder the three headers individually thus making the 'middle row' a none issue, push them on the back of the socket and hang the socket off the board on a short umbilical cable This also makes inverting the board for test far easier.

But as the female jumper leads that I've been using with the Arduino were themselves rather unreliable - falling off at a mere touch, a better breadboard solution was also called for. I've found one with screw terminals AND header sockets so this may be the best of both worlds.

. . . . we'll see when it arrives !

17
The Water Cooler / Re: What's the deal with Clockwork Square Dimples?
« Last post by russ57 on September 11, 2021, 01:43:42 AM »
I suppose if us amateur modders could buy it, assuming the dots are accurate, it would make layout easy.

But since those examples are almost certainly stamped, ive no idea either.
Unless they are an artefact of the press?

-russ

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The Water Cooler / What's the deal with Clockwork Square Dimples?
« Last post by S. Heslop on September 10, 2021, 10:52:43 PM »
I opened the cheap dial indicator since i'd foolishly left it next to the computer and it's inevitable curiosity would get the better of me. Thankfully it wasn't the kind of mechanism designed to explode. But inside I found The Squares again.



Alot of clockwork and clockwork related stuff (camera shutters, tape mechanisms, etc) is built from these plates with regular square dimples. Sometimes they're arranged specific to the part, away from holes and such, and sometimes it's like this where it was clearly in the plate before it was cut. But i've got no idea what their purpose is. Some kinda reenforcement? Equilizes stress? An old decorative 'symbol of quality' nobody dares drop? A hardness testing department that gets paid per reading? Extremely aggressive work-holding? Work hardens the material?

It's been bothering me for years but I was too embarrassed to ask since... it also looks like it should be obvious somehow, especially when it's so ubiquitous. I think at this point i'd be a little disappointed if the answer wasn't blindingly obvious..
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General Crafts / Re: Anyone for a Standard Surveying Thread?
« Last post by awemawson on September 10, 2021, 05:37:53 PM »
I found several references to American standards, and even one of the Americans adopting the Whitworth thread for this usage, but no UK ones sadly.

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General Crafts / Re: Anyone for a Standard Surveying Thread?
« Last post by Spurry on September 10, 2021, 01:46:56 PM »
Thanks for the hint, Andrew. My searches on t'internet could not provide the info I was looking for, hence my post.
It just seems (to me ) to be very odd that there are lots of references to this Standard Surveying Thread, as if everyone should know what it is.  :doh:
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