Why not use a laser cutting service to make encoders? The cost is reasonable and they are capable of <0.002 features. Here is one in my area: http://www.gatewaylaser.com/cutting.html.
>________________________________ > From: charles green <xxzzb...@yahoo.com> >To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> >Sent: Sunday, February 26, 2012 6:24 AM >Subject: Re: [Emc-users] Film Emulsion for Encoder Wheels? > >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 > > > ------------------------------------------------------------------------------ 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
