The gecko 320 takes the pulses from the encoder and multiplies it times 4. Actually it counts each edge of the pulses from the two channels as one pulse (200 pulses is 400 edges times two channels is 800 edges). Each pulse from the pulse generator (computer usually for us) will move the motor one encoder pulse. This works great as long as you have encoders in the 200 to 400 CPR range. When you get 1000 cpr encoders the computer will have to put out 4000 pulses to rotate the motor once. On 5 tpi screws thats 20,000 pulses per inch. At 100 inches a minute thats 2,000,000 pulses a minute. That's a lot to expect from a PC out the parallel port.
The easiest is to buy some new 200 cpr quadrature encoders.
Eric
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I wish it wouldn't crash. |