[Jewelry making - Article 00004] - Re: [Orchid] Anvil, flexi, polisher

[jesse brennan]

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    Actually the  low cost grinders  are  not a bad idea. The  3450 rpm
    speed is the same speed that the special polishers run at (Baldor
    motors being accepted as best).  The best and expensive ones have a
    little better bearings and will last longer but they cost about 5+
    times more. The cheap ones have enclosed motors as well and will
    last a very long time in polishing  service . 

    The recommended speed for coarse grinding  on non ferrous metals
    will equate  to a about 2" wheel at 3450,  medium polishing would
    call for a 6" buff at 3450 and an 8"  buff  at 3450 for super
    polishing sterling  (Per Hekki Seppa's "Form emphasis for
    metalsmiths"). These are all induction motors  and  will not  change
    speed with a rheostat! There are some low speed grinders available 
    that run at 1750 rpm and some that run about 1150 rpm ,  these cost
    more . These are really for tool  sharpening where the lower  speed
    is desired ,  but polishing  likes the higher speeds.    You may
    feel  more comfortable with  the lower speed 1750 units-- some do. 
    I use 3" medium  buffs and  6"  finish buffs at 3450 rpm on   Delta 
    $30 grinders. 

Jesse



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