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Maltese Cross

How to machine a Maltese cross

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Stephen Rowley	23/01/2011 10:56:03
57 forum posts 14 photos	As I once was a cinema engineer and until 2006 had a large collection of old cinema projectors I thought I might have a go at making a 1/3 scale model of one of the odd British projectors from 1947. All simple enough but to make it work I need to make a Maltese cross from MS and about 7/8 across by 1/4. Any advice please. jsk P.S. I can make a Maltese cross by hitting him!
Robert Dodds	23/01/2011 19:59:42
324 forum posts 63 photos	Hi, The more correct name for the film advance mechanism you seek is Geneva wheel mechanism. Right sort of area but wrong country If you look on this site there is most of the design parameters set out and a little animated bit as well . There are lots more to google under Geneva mechanism so go and explore. http://www.meadinfo.org/2009/05/geneva-wheel-design.html http://www-bsac.eecs.berkeley.edu/~pister/245/project/KumaresanVidya.pdf Regards Bob Dodds
Stephen Rowley	26/01/2011 13:18:55
57 forum posts 14 photos	If I were to go in to any cinema in this county and say Geneva wheel mechanism no one would know what I was talking a but, if I said cross box or intermittent unit as the Americans call it that would be different. In the book by the S.M.P.T.E. it is described as a Maltese cross and Geneva pin movement. JSK

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