![]() It needs to allow me to physically push the lever from step to step, and have it know which step/notch it's in (hence the potentiometer i guess. Say i have the lever / disc allowed to move ~ 150 degrees, and want 10 steps / notches from end to end of those 150 degrees, which i would imagine is a set of very coarse steps with a certain force resistance between the steps. ![]() What i am asking it to do is have a set of 'notches' stored in memory. and when they do get move past a 'step' they are now out of sync with where they think they are. Just ordered a cheap kit with those tiny geared steppers and drivers just to play and likely burn a few out,Īnd looking to get a cheap nema 17 motor and driver.Īll i 'think i know' is that usually steppers are used to move things to a specified position by counting the steps, and they resist being moved by external forces. I've never played with stepper motors before. Wire up a stepper moto driver, arduino, psu etc,īelow is a simple controller i made about 8 years ago, but as you can see, it's only good for a single train (BR 425) due to having mechanical fixed notches. I can make the levers on my lathe and mill, and mount them on a shaft with bearings and brackets to bolt to the underside of the desk, and connect the stepper and a potentiometer to that shaft. mechanical stuff i'm fine with, i can easily make the driving desk out of wood / metal / 3D printed parts, Would i be able to make the stepper motor simulate notches?įor each train i load on the simulator, i'd load a different notch profile, and the stepper would be varying it's power to resist pushing the lever past the 'notch locators' then holding the lever in position until it's moved again.Īs you can guess. What i am thinking, if i connect the lever disc to the shaft of a stepper motor, a potentiometer would also be mounted to send to levers position to the simulator, which i'd imagine i'd also want to read for the stepper motors position feedback? Some have just one or 2 notches at the beginning / end, then a smooth rotation for infinitely variable power / brakes and so on. Some have a combined power and brake lever, with a heavy notch in the middle, then lighter ones up and down. My problem is that different trains have different numbers of notches, the second from last notch on the brake lever will be much harder to overcome, as it's the emergency brake setting, and you don't want to be 'slipping' into that notch accidently when you apply full service brake. This gives you the notches for the different power / brake levels.Īlso, there's different resistances between some notches, i.e. In the real thing, the disc rotates a hex shaft mounted between bearings, that shaft is connected to a potentiometer (or air valve) and along the shaft are 'detent wheels' (plastic / metal discs with semi circles cut out the edges) spring loaded 'cam rockers' press against these discs, and when they fall in the cut outs as they rotate with the lever movement, they hold the lever in position, and provide some resistance to moving the lever more.
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