Adding An Encoder To A Pittman 8000 Series Motor
This series of steps was developed from messages and interaction on the DPRG mailing list. Some ideas are not mine but were gleaned from that list.
First, Take The Rear Off The Pittman 8712 (60.5:1 version).
Then Tap The Unused Holes For 2-56 or 4-40. These Will Hold The Encoder.
Take The Front Gearbox Plate Off and Use It As A Pattern To Make A Motor Mount.
Reassemble The Front And Rear of The Motor.
Choose A Backing To Hold The Encoder Disk (I used a thin brass washer).
Super Glue The Backing On To The Rear Motor Shaft.
The Third Pattern Was Borrowed From Sluggy on DPRG
Use Rubber Cement To Tack A Laser Jet Printed Pattern Onto The Backing.
Assemble The Photo-reflector Wafer (I used point to point wiring).
Mount the Wafer To Three Mount Points On Back Of Motor.
I Use Nylon Flanges Epoxied To The Wafer To Make A Sturdy Hookup.
I Also Used Nylon 4-40 Nuts On The Circuit Side To Prevent Accidental Shorts.
Use A Shortened Film Can As A Back Cover.
Looks Like This.
Smoke Test It.