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Colin Thorne's - Portable Ring Sundial by Craynerd

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raynerd:
Well over a year ago, in fact probably a couple of years ago I had been shown some plans for Colin Thorne's Portable Ring Sundial while visiting Stew. He has nicely put together a spreadsheet showing the calculations to generate the graph and has passed this on to me. I`ve fancied it for a while and when I ordered my latest clock book (Gearless Clock) and materials, I ordered a copy of the plans. It always did look a simple build, the problem is an accurate graph needed engraving on a piece of brass 20mm wide and I don`t have a steady enough hand. I spoke to my mate at school who is an Art teacher and he said he had a hand engraver for something he does on wood but he hadn`t ever done metal but was willing to have a go. I left it with him and it came back yesterday!!

So I have done everything with the metal but I take no credit for the engraving!

Top section is my initials CR and the latitude:


Graph is on the bottom section:



He couldn`t help doing something on the normally blank back! I like it a lot!


Removed the layout black and gave it a polish:



Then started to bend it around a former:


Got stuck because I couldn`t bend it, posted a message here on madmodder and after taking advice given, primarly annealing all was well  :nrocks:


Silver soldered the two ends together. I`m still a bit messy with my silver solder, I think I still put a little too much on but I`m getting better.


Layed out for the top hanging bracket:




 

And that is a far as a I got this evening, here is a dry pose!



I think it is going to work quite well. I need to give it a really good polish up and then start to assemble the parts!

Chris

Brass_Machine:
Hiya Chris...

Looking good so far. I like this a lot. Where did you get the plans for it?

Eric

mhh:
Really nice! :thumbup: I would love to have the plans!

Stilldrillin:
That's lovely Chris!  :thumbup:

Well done, so far. It's going to be a cutie....  :clap:

David D

Chuck in E. TN:
Plans are available here:

http://www.clockmaking-brass.co.uk/portable_ring_sundial.htm

An explanation of how they work, and another version is here:

http://leewm.freeshell.org/origami/ringdial.pdf

I would like to build the second one, myself.

Chuck in E. TN

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