Weight driven clockwork roasting spit

Live and learn. It seems to have something to do with the pitch or angle of the threads on the worm. (SeeCog drives worm) (https://www.youtube.com/watch?v=ykeiByIel64&t=299s). I´m sure there are better illustrations out there.

https://youtu.be/vwF6z2tJHVA shows a similar setup in operation

Sorry, mean to insert a link there. This short video clearly shows that a gear will move a worm as it does initially, albeit with a bit of manual help to get things going. Antique spit roaster

In days gone by, I wonder how many kitchen skivvies have had a thump around the head from that flying arm whizzing round at a rate of knots? No health & safety back then...

Regards Mike

There are down-loadable copies of Joseph Moxon's "Mechanics Excercises" contemporary book with detailed instructions for making these machines.

dave8

Well-found, David

This link currently works nicely : **LINK**

https://blog.lostartpress.com/2013/05/13/free-download-joseph-moxons-mechanick-exercises/

and the relevant text starts on p39 of the book

MichaelG.

Your query is answered on page 34.

dave8

Edited By david bennett 8 on 24/11/2022 05:23:56

The naysayers clearly do not know that many old cars had worm drive, and did not stop dead as soon as the throttle was lifted.

But if the Andy Crawley is who I think he is, he will be better informed on the works of old motors than many of us.

Cheers, Tim

It would now be made on milling machine using dividing head connected to the table leadscrew, Setting up is the hard part machining is the easy bit.

I am who you suspect I am😉✅.

My main motoring experiences are with chain driven cars however I did once nearly buy a 1925 AC Royal 11.9 which did have a worm final drive. I can confirm that it did not have problems on the over-run.