Windscreen Wiper Motor/ Rotary Fixture Drive Queries

I want to make a setup that can drive some rotary motion compnents without having to resort to continuous hand cranking, for example a
rotary table on the mill or a spindle for cylindrical pin grinding on a surface grinder.
I know that windscreen wiper motors have been used by others for similar jobs and have a few queries. First off is RPM. How fast do they generally spin, do they have an integral reduction gearbox like a planetary system to achieve this, or is it a bolted-on-the-end-job?
Second is torque - what sort of ball park torque do they put out, and is one particular (vehicle) make of motor more suitable than others? For instance I have heard Land Rover wiper motors mentioned in the past, I think AWEM used one to drive the table on a Dronsfield grinder.
Finally comes power supply. My thoughts are that I could run this off a suitable battery charger to get the necessary 12V supply, is this feasible? Thanks
Peter
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Worm and wheel, quite crude. Go for an early type motor as the later ones need the small electronic module for the 3 speeds and pause to rip the rubber strip off.
Yes will run off a decent battery charger
John S.
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On Sun, 18 Jan 2009 04:36:49 -0800 (PST), John S

Just be careful with a battery charger. Some put out a high voltage off load that could blow whatever you may control the motor with! (see seperate thread on speed controls).
A 13.6v psu for a Base station CB radio can be a cheap option. Alternatively maybe just a 240/9v transformer, Bridge rectifier and capacitor.
Richard
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On Sun, 18 Jan 2009 13:42:25 +0000, Richard Edwards

I had a bit of luck today and don't need the windscreen wiper motor anymore. Just got a (free) little old Parvalux foot mounting motor about 4" long, 240V and 198 rpm.<G>
Peter
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    --FWIW I built a rig with one of those surplus worm drive wiper motors and I used an R/C motor speed controller to drive it. That way I could use a rheostat that plugged into the AC. I think there was a Stamp in there somewhere too; gotta take it apart to remember exactly what I did tho. Bottom line: there are lotsa options.
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