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A DIY push-pull spinner
PL1:
Looks like an interesting design, but my main points of concern are these:
1. Friction against the microswitch nub while pushing/pulling and turning at the same time causing wear. (plastic vs. metal)
2. The encoder wheel 4mm vertical travel range (+2mm to -2mm) may cause problems like hitting the sensor or with the sensor/wheel distance unless the sensor can shift up and down with the encoder wheel and shaft.
Scott
Mysterioii:
--- Quote from: PL1 on October 16, 2012, 01:32:58 pm ---Looks like an interesting design, but my main points of concern are these:
1. Friction against the microswitch nub while pushing/pulling and turning at the same time causing wear. (plastic vs. metal)
--- End quote ---
Use the microswitches that have the roller on the actuating lever... example:
http://omvol.en.alibaba.com/product/436002015-213182615/Short_Hinge_Cross_Roller_Lever_Micro_Switch.html
PL1:
--- Quote from: Mysterioii on October 16, 2012, 02:03:23 pm ---
--- Quote from: PL1 on October 16, 2012, 01:32:58 pm ---Looks like an interesting design, but my main points of concern are these:
1. Friction against the microswitch nub while pushing/pulling and turning at the same time causing wear. (plastic vs. metal)
--- End quote ---
Use the microswitches that have the roller on the actuating lever... example:
http://omvol.en.alibaba.com/product/436002015-213182615/Short_Hinge_Cross_Roller_Lever_Micro_Switch.html
--- End quote ---
Which increases the actuation distance ==> more of point #2. :dunno
If the roller was over the nub instead of at the end of an arm, it would solve the increased actuation distance issue. Some arms are removable -- might be able to cut/re-bend it shorter.
Radioshack has these.
Scott
Mysterioii:
Yeah you just bend the lever arm, put it on pretty much any level you want.
PL1:
--- Quote from: Mysterioii on October 16, 2012, 03:06:14 pm ---Yeah you just bend the lever arm, put it on pretty much any level you want.
--- End quote ---
The problem isn't the height, it's the length. Shorter arm requires less vertical travel (blue) than the longer arm. (red)
Scott
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