powerwindows83 Posted October 25, 2017 Posted October 25, 2017 hi guys! ive seen many different designs for stepper mechanisms on youtube (...https://www.youtube.com/watch?v=w1Nj-5ISZow...) primarily to be used for shifting transmissions remotely, but none quite achieve what i'm looking for. all of them use a cam attached to a motor that will advance the mechanism by an increment every time the cam executes one revolution. to control these types, the user would have to listen for the click or look for the effects (ie vehicle speed change) to know to stop driving the motor, which if messed up could lead to overshooting the desired number of shifts or possibly breaking something depending on the design. so my question: has anyone developed a stepper mechanism that advances one increment based off of the motor being accelerated as opposed to rotation count? like if i wanted to shift up i would run the motor, and the motor would increment the mechanism but then keep spinning freely until i tell it to stop, at which point it would 'reset' itself mechanically and be ready to shift again when i want? i doubt just throwing a slipper clutch at one would work because of the high force it takes to actuate such mechanisms, and that wouldnt work in most designs since the force of stopping the cam is the same as shifting, therefore a slipper clutch wouldnt do anything or it would prevent the mechanism from ever shifting. any ideas for this? Quote
Jurss Posted October 25, 2017 Posted October 25, 2017 U could use servo motor. One action, one swtiching. Also reverse switching is no problem. Quote
Didumos69 Posted October 25, 2017 Posted October 25, 2017 (edited) 2 hours ago, powerwindows83 said: i doubt just throwing a slipper clutch at one would work because of the high force it takes to actuate such mechanisms, and that wouldnt work in most designs since the force of stopping the cam is the same as shifting, therefore a slipper clutch wouldnt do anything or it would prevent the mechanism from ever shifting. any ideas for this? If you could somehow control the lever - in the setup below - with a geared down motor output and have ain between the motor and the axle driving the lever, then I guess it should work. The lever need not return for a shift to finish. Returning the lever could be the start of a later countershift. Edited October 25, 2017 by Didumos69 Quote
mocbuild101 Posted October 25, 2017 Posted October 25, 2017 1 hour ago, Jurss said: U could use servo motor. One action, one swtiching. Also reverse switching is no problem. Except it would need to rotate back to it's start position after switching... which would cause it to switch the gears back... I know it would be possible to eliminate that mechanically, but the question is, is it possible within a reasonable size? Quote
Aventador2004 Posted October 25, 2017 Posted October 25, 2017 You could look at one of @DugaldIC's steppers, they are motorized. It is a few images in. https://photos.google.com/share/AF1QipOB88OmHf1gkMFXU6yv45se41qrpobKVJke2So3ur0vKtKKKC0fl24WBOiwFssJfA?key=NnVwR3VXdmVpd1NMc3Fva2ZBSm5hMlRINFFMMW5n Quote
PorkyMonster Posted October 25, 2017 Posted October 25, 2017 46 minutes ago, Aventador2004 said: You could look at one of @DugaldIC's steppers, they are motorized. It is a few images in. https://photos.google.com/share/AF1QipOB88OmHf1gkMFXU6yv45se41qrpobKVJke2So3ur0vKtKKKC0fl24WBOiwFssJfA?key=NnVwR3VXdmVpd1NMc3Fva2ZBSm5hMlRINFFMMW5n This looks interesting... not sure about its performance though... Otherwise, I'm sure that @Didumos69's stepper PLUS servo works flawlessly... no need for any slipper/clutch - I know, because I've tried . Quote
Aventador2004 Posted October 25, 2017 Posted October 25, 2017 Just now, PorkyMonster said: This looks interesting... not sure about its performance though... Otherwise, I'm sure that @Didumos69's stepper PLUS servo works flawlessly... no need for any slipper/clutch - I know, because I've tried . Just putting my thought in the barrel. Quote
PorkyMonster Posted October 26, 2017 Posted October 26, 2017 13 hours ago, Aventador2004 said: Just putting my thought in the barrel. LOL... same here. Anyway I just went through the pictures again, I think @DugaldIC's stepper seems to require intense listening/observation for it to stop advancing to the next gear as well... correct me if I'm wrong. Quote
Aventador2004 Posted October 26, 2017 Posted October 26, 2017 15 hours ago, PorkyMonster said: LOL... same here. Anyway I just went through the pictures again, I think @DugaldIC's stepper seems to require intense listening/observation for it to stop advancing to the next gear as well... correct me if I'm wrong. Yes, it does take a lot of listening. Quote
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