Does anyone have an idea of how to index a scratchbuilt turntable, or where I can get complete plans? [ 03 February 2002, 10:01: Message edited by: Graphite ]
Somewhere recently I've seen an article about using an Atlas turntable mech under a scratch -built turntable, which gives full indexing - I can't find it at the moment - might be in Feb 2002 Railway Modeller, but I need to go on a hunt. If I find it I'll let you know
Atlas uses a Geneva mechanism, set for eight equal spaces around a circle. By its design it will advance and stop at each location as it seeks the one you desire. It is the mose accurate of the mechanical types that I have seen. I am using a Diamond Scale 134 foot turntable and pit with 33 stall tracks. I use a computer controlled indexing system from New York Railroad Supply that stops each track withing .0040" every time and has 33 stall tracks. Everything is mounted on ball bearings, and has to be precision machined to operate correctly. If you build your own turntable and pit, set the pit rail with an indicator for flatness and perfect circle, to use a computer control. Bit of advice: Set your turntable, where you can reach it easily, because you will (or someone will) run an engine into the pit! Be sure it sets level in all directions, or you will have a 200 ton crane coast off into the pit too! Yep! I sure did!
Graphite, I am moving this topic to the inspection pit where you may find more modelers with turntable building experience. Topic: Turntable Indexing? jjbcnc - welcome to trainboard! [ 04 February 2002, 03:23: Message edited by: yankinoz ]
