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This topic comprises 2 pages: 1 2
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Author
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Topic: Shape of intermittent cam.
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Brian Tristam Williams
Film Handler
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Posts: 93
From: Johannesburg, South Africa
Registered: Apr 2002
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posted 07-02-2002 01:18 PM
Tim Reed, I tried to e-mail you on this, but your address is not made public.I saw the animation in the 'Videos' section, and I want to build a larger-than-life working model of this. Someone I know, who's a bit of a mechanical engineer, says that this shape will never work. I've researched this, and I see that there are several ways of creating an intermittent motion. Is the animation merely a fanciful example, or is that the shape of most real intermittents? If this model will work, could you send me a 3D object file of it, Tim? The engineering shop needs it on disk to build me one. ------------------ "One man can make a difference."
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Josh Jones
Redhat
Posts: 1207
From: Plano, TX
Registered: Apr 2000
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posted 07-02-2002 01:58 PM
That is really what they look like. I'll post a pic of what a brenkert movement looks like.*Pic here* As you can see, the "starwheel" does indeed posses a star shape. Josh
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John Pytlak
Film God
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Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 07-03-2002 08:52 AM
Check out the new Kodak "Quickermittent" design, that slightly modifies the 4-slot starwheel and cam to produce a faster pulldown (56 degrees cam rotation instead of 90 degrees), greatly increasing efficiency of illumination: ![](http://www.film-tech.com/ubb/smile.gif) "Design Improvements for Motion Picture Film Projectors" C.L.DuMont, A.F.Kurtz, B.D.Silverstein, D.H.Kirkpatrick SMPTE Journal, November 2001, pp 785-791. The paper is also published in the June 2002 issue of BKSTS Cinema Technology (Volume 15, Number 2). Prototype starwheels and cams were retrofitted into Century, Simplex and Christie intermittents. ------------------ John P. Pytlak, Senior Technical Specialist Worldwide Technical Services, Entertainment Imaging Research Labs, Building 69, Room 7525A Rochester, New York, 14650-1922 USA Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243 e-mail: john.pytlak@kodak.com Web site: http://www.kodak.com/go/motion
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