brushes/making positioner

[bearracecars]

looking for some heavy duty brushes for a positioner anybody have sugestions from trial and error on building a positioner
thanks
william haywood

[awright]

If you google "motor brushes," you get 3,460,000 hits. Many of them are suppliers of brushes to motor OEMs and will probably be more than happy to take your data on possible maximum currents and speeds and space available and recommend a specific brush.

awright

[bearracecars]

duh sometimes i just don't think! has anyone made a small table to positioner before? that could offer some advice. what would be some do's and don'ts?
thanks

[pulser]

Bear, some ideas for you.
1. Keep it Simple Stupid (KISS), attach ground cable to table and let it wrap as you rotate. Reliable and cheap.
2. Attach ground cable to a section of flat braided copper strap, wrapped around the rotating steel shaft of the table, tensioned with a spring. This design is used in some Jetline Positioners, it works well.
3. Tweco makes a bronze rotational ground that uses a conductive grease.
4. Mercury slip rings $$$$$. http://www.mercotac.com