I'm not meaning to be a joy killer, but have you looked at the encoder wheels that you can buy from places like US Digital?
The seem really cheap to me at $18 for a qty 1 - 2" diameter disk including a hub. Higher volumes and the prices drops quickly. I bet if you call them they will tell you how they make those. They are pretty open about their technology. Dave On 2/26/2012 12:59 PM, Greg Bernard wrote: > 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 > > ------------------------------------------------------------------------------ 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
