nanosecond scale light pulses can be had for the focussing of a laser on a rotating pin hole in a sheet of houshold aluminium foil. i was just looking for single pulses, and used just one foil pin hole mounted on a cardboard disk about 100mm dia on a little dc motor. cnc with a pin punch instead of a spinning cutter could certainly generate a circular array of such holes. tip for small pin holes: use many layers of foil, and select from the bottom most layers.
--- On Sat, 2/25/12, Kirk Wallace <kwall...@wallacecompany.com> wrote: From: Kirk Wallace <kwall...@wallacecompany.com> Subject: Re: [Emc-users] Film Emulsion for Encoder Wheels? To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Date: Saturday, February 25, 2012, 9:41 AM On Sat, 2012-02-25 at 08:25 -0800, charles green wrote: > if you can work in 35mm space, make a large laser print of the wheel, > photograph it a few stops under exposed, over develop it, and cut the > finished disk out of the negative. works for crude diffractive lenses > too. ... snip I need a larger encoder and preferably on glass, but I do have some Graflex cameras that hold larger film. I also have my father's darkroom equipment, but getting it all working again could be a whole other time and money sink. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
