Externet Posted December 14, 2023 Share Posted December 14, 2023 Hi all. Trying to find in the market a motorized mechanism that sweeps an angle of chosen magnitude; can be even a toy or toy part. There has to be something available. Ideas please ? Wheel W turns pushing and pulling a link L that moves forth and back a part continuosly sweeping an angle A. + are pivots. Varying radius R changes the angle A swept. There may be dozens of different approaches, sketches to produce the same. Link to comment Share on other sites More sharing options...
pzkpfw Posted December 14, 2023 Share Posted December 14, 2023 Could you just use a servo? If it doesn't need to be too strong, you might find a cheap Arduino kit with a servo. Then easy to program, for how much sweep you want. This kind of thing (skip right to near the end to see in action): Link to comment Share on other sites More sharing options...
Externet Posted December 14, 2023 Author Share Posted December 14, 2023 10 hours ago, pzkpfw said: Could you just use a servo? Thanks. Yes, a servo does work but strongly prefer something electronically simpler as geared motor with no circuitry as will have to work in corrosive hard-to-reach enclosure and no stepper motion but analog smooth. Link to comment Share on other sites More sharing options...
sethoflagos Posted December 14, 2023 Share Posted December 14, 2023 2 hours ago, Externet said: Thanks. Yes, a servo does work but strongly prefer something electronically simpler as geared motor with no circuitry as will have to work in corrosive hard-to-reach enclosure and no stepper motion but analog smooth. Are you looking to operate another mechanism with it? What's the desired amplitude, cycle period and torque? How much space is avaiable? Can you be more specific about 'corrosive'? Link to comment Share on other sites More sharing options...
MigL Posted December 14, 2023 Share Posted December 14, 2023 Sorry, but the first thing that came to mind is an oscillating lawn sprinkler. Powered only by water pressure, and manually selectable angle of coverage. Link to comment Share on other sites More sharing options...
Externet Posted December 14, 2023 Author Share Posted December 14, 2023 1 hour ago, sethoflagos said: Are you looking to operate another mechanism with it? What's the desired amplitude, cycle period and torque? How much space is avaiable? Can you be more specific about 'corrosive'? Thanks. No, stands alone. 10 to 270 degrees; 10 degrees/second; 30 seconds, no load (no torque). 20cm x 20cm x 20cm. No. Link to comment Share on other sites More sharing options...
sethoflagos Posted December 14, 2023 Share Posted December 14, 2023 2 hours ago, Externet said: Thanks. No, stands alone. 10 to 270 degrees; 10 degrees/second; 30 seconds, no load (no torque). 20cm x 20cm x 20cm. No. First port of call would be a windscreen or headlight wiper mechanism from a car scrapyard. The cheap ones, not the ones with reversible motors. You might get the required sweep and cycle time by tinkering with the linkage, but incorporating a reducing gear might be more productive. Link to comment Share on other sites More sharing options...
studiot Posted December 14, 2023 Share Posted December 14, 2023 Suggest an old fashioned mechanical metronome. They can be had second hand very cheaply since electronic ones took over. Link to comment Share on other sites More sharing options...
swansont Posted December 15, 2023 Share Posted December 15, 2023 A stepper motor might be (part of) the solution.. Link to comment Share on other sites More sharing options...
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