Clock or Spit Jack
Posted 13 September 2008 - 06:43 PM
I'd like to build one like this..
Any info appreciated
Posted 13 September 2008 - 07:11 PM
Make sure you get the full book and not just the printing section that is commonly sold. I got a copy put out by Astragal Press.
Haven't tried his plan...yet.
Posted 13 September 2008 - 07:22 PM
Posted 17 September 2008 - 09:06 AM
ClockJack - a set on Flickr
Flickr Photo Download: Opera di M. Bartolomeo Scappi (1570) g
I recently was able to video the inside "ratchet" of a clock jack
Posted 17 September 2008 - 11:27 AM
Looks like a shop winch, but there has to be more to it than that.
Posted 20 July 2009 - 05:56 AM
Hope you are still active and reading posts.
I am planning to make a 'Clock Jack' too, we call it a 'Spit Engine' here in the UK.
Did you have any luck getting plans and do you have any advice to pass on?
Posted 20 July 2009 - 06:58 AM
Posted 20 July 2009 - 07:18 AM
Thanks for the offer, but I have a copy of that excellent book (and reviewed it on the forum some time ago).
A scan of the plans and text in Moxon's book would be most welcome if you have a copy!
I have many, many illustrations and photo's of spit engines and some video of the mechanisms working - courtesy of another posting on IFI. But... I am very keen to find plans/blueprints from the correct period.
The reason for this is that I am pretty sure that there is a certain ratio that experience has proved to work best in the gearing; comments from local horologists give strength to this thought. It would be soul destroying to hand cut all the cogs etc. just to find I had discovered a poorly functioning ratio!
I have been in touch with Ivan Day (food historan), he built a copy of the spit engine in the kitchen at the castle museum in York. He is abroad for a couple of weeks but I'll have a chat with him on his return and will pass on any good advice to all who are interested.
Posted 21 July 2009 - 07:55 AM
Posted 21 July 2009 - 10:12 AM
Posted 04 August 2009 - 03:28 PM
I have finally tracked down and bought a fairly ropey copy of Moxon's book (the prices most sellers were asking were crazy!).
The good news is that the title is well and truly out of copyright.
The book does indeed contain a basic plan and quite detailed instructions for the construction of a spit jack ('clock jack' to brother Jonathan). Given time - and some luck with my techno-skills - I shall add the scanned-in chapter.
Hope this will be of help to some.
Please keep me posted if you have a go at making this according to the instructions. Any tips learnt along the way will be most welcome.
Edited by GNJC, 04 August 2009 - 05:25 PM.
Posted 04 August 2009 - 05:16 PM
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