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Would this Encoder work? and Encoder Recommendations
My team is looking to use encoders this year and I know a shaft encoder would work well so you could tap a hole in like hex shaft then just insert the encoder and it would work, but what encoders would people recommend? I've hard US Digital a lot. Would an encoder like this work, or would something else work better?
http://www.ebay.com/itm/NEW-US-DIGIT...AOSwfZ1WaMQ 7 |
Re: Would this Encoder work? and Encoder Recommendations
It would work. But how are you keeping it from losing contact with the hole in the hex shaft? Pressure fit? That would make it hard to swap out if needs service.
See if you can pressure fit a gear on to that shaft, and another on the hex shaft. Mount it gear-to-gear. |
Re: Would this Encoder work? and Encoder Recommendations
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Re: Would this Encoder work? and Encoder Recommendations
We have also used shaft couplers to connect this sort of encoder to a drive shaft. If you are connecting a 1/4" stem to a 1/2" shaft, you will need a significant filler. A 5/16" nut takes a 1/2" wrench, so that'll get you most of the way there; a bit of tubing can do the rest.
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Re: Would this Encoder work? and Encoder Recommendations
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This worked well for us. If you want to mount the encoder directly to the shaft, I have a suggestion for that too, but it will require me to break out my crappy paint skills. Just let me know if you're interested! |
Re: Would this Encoder work? and Encoder Recommendations
http://www.ebay.com/itm/160817272031...%3AMEBIDX%3AIT
Maybe worth a look for $10, much lower resolution though. |
Re: Would this Encoder work? and Encoder Recommendations
That one Scott looks like a panel mount encoder intended as a human operated thumbwheel. Generally that means it isn't designed for use at speeds and stresses drive mechanisms see.
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Re: Would this Encoder work? and Encoder Recommendations
I've heard of teams using like US digital s4t (if I remember correctly), where would you purchase one of these? I couldn't find any on Ebay...
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Re: Would this Encoder work? and Encoder Recommendations
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Re: Would this Encoder work? and Encoder Recommendations
http://www.usdigital.com/products/s5
Sorry for so many questions, but would an encoder like this work? I noticed there were for sale here on CD by another team, the connectors just look a little different. S5-5000-250-IE-S-B to be specific. |
Re: Would this Encoder work? and Encoder Recommendations
I purchased one of these the other day for a personal project.
I wanted 360 PPR, and relatively low cost, so this fit the bill. When it arrived, I was STUNNED by the build quality!! It is a VERY well built encoder! That said, it is a lot larger than most encoders of this style. It is approx. 1.5" dia. and approx. 1.4" long. I also found that using 4.7K ohm pull up resistors with it made it very stable with my Arduino. BTW, you can get this in a couple more PPR values. |
Re: Would this Encoder work? and Encoder Recommendations
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Re: Would this Encoder work? and Encoder Recommendations
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We use the S4T, they set you back $70 a pop, but are bullet proof. Order directly from US Digital at. http://www.usdigital.com/products/en...tary/shaft/S4T |
Re: Would this Encoder work? and Encoder Recommendations
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For shooters, we've typically use 2PPR. When you've got a wheel spinning at a few thousand RPM, you don't need many counts per rev to get an accurate speed. A 5kPPR would amount to over 2 million pulses per second on some shooters we've used. |
Re: Would this Encoder work? and Encoder Recommendations
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If you want a bulletproof encoder, you're better better off with a Grayhill or an AMT-103/102. Both of those I have seen take serious abuse without failures. |
Re: Would this Encoder work? and Encoder Recommendations
Another mounting option for this encoder is to drill a slightly loose hole in the end of the drive shaft to fit the encoder shaft, then cut a slot in the end of the drive shaft to split it and use a clamping shaft collar to hold the encoder securely in the end of the shaft. Works well and can remove/swap the encoder with ease.
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Re: Would this Encoder work? and Encoder Recommendations
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and had issues with the students assembling. We have never used Grayhill, so maybe they are even better, YMMV? |
Re: Would this Encoder work? and Encoder Recommendations
We have used grayhill encoders the past two years and have not had any issues. We have also used surgical tubing to connect the encoder to an output shaft effectively.
They can be a bit hard to find come build season but we have been purchasing them from mouser. par number 63R256 is a 256 count encoder but there are others. |
Re: Would this Encoder work? and Encoder Recommendations
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Generally speaking, Low RPM favors higher PPR and vice verse. That is a GENERAL rule, not a hard and fast one. Again, it depends. It depends on what you want to do, control speed, distance, or both. What also plays into the decision is what control method you are using. There are trade offs with every choice. The best thing you can do is test out different approaches during the off season. |
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