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19th Apr 2019, 11:15 AM #1Diamond Member
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Future Project - Speed Indicator for MIll
Hi Blokes,
I want to attache a speed indicator to my mill. But I have little experience with electrical work so I'm asking what I need and how to go about it.
I'd probably get my materials for Jay Car.
If anyone has done it and has a build log or knows of a U tube series that would be really helpful.
Regards Ben.
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19th Apr 2019, 12:17 PM #2Diamond Member
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Something like this is probably what you are after I think. You can set it up to run from a plug pack type power supply.
https://www.ebay.com.au/itm/4-Digita...4AAOSwXaxasfBe
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19th Apr 2019, 08:15 PM #3Golden Member
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The unit shown by ComVC would be a good choice. I set up something similar on my milling machine as shown in this thread starting at post #134:
//metalworkforums.com/f65/t1592...illing+machine
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20th Apr 2019, 12:13 AM #4
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20th Apr 2019, 07:53 AM #5Most Valued Member
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Same, I have used similar setups on two machines although I sourced the components individually on ebay rather than as a kit.
They work very well and cheap as chips. I did however have an issue initially with the one mounted on my mill. It picked up noise from the VFD and gave erratic readings. It was a simple fix of using a 0.1uF MKT capacitor as a basic low pass filter by connecting it across the signal in and ground.
SimonGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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20th Apr 2019, 11:16 AM #6Philomath in training
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You can't just use an optical tacho from ebay? Cheap, self contained and no working out why the electrons won't behave.
Michael
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20th Apr 2019, 11:22 AM #7Diamond Member
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One of these? https://www.ebay.com.au/itm/Mini-Pro...frcectupt=true
I have one of those, but fixed permanent display is a much better option.
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20th Apr 2019, 12:20 PM #8Diamond Member
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20th Apr 2019, 02:12 PM #9Member: Blue and white apron brigade
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20th Apr 2019, 05:20 PM #10Golden Member
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20th Apr 2019, 08:37 PM #11
Hi Guys,
I have one of these, they do work very well. They come with some self adhesive reflector strips which you apply to to item you want to measure the speed of.
https://www.ebay.com.au/itm/Mini-Pro...frcectupt=true
However I did find that mine also picked up electrical noise from the motor brushes arcing as the motor turned. easily recognised by the erratic readings. Moving further away from the source of the interference solved the problem.Best Regards:
Baron J.
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20th Apr 2019, 11:26 PM #12Most Valued Member
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I recently bought one of this type from Banggood. I think it was about $12.00. When it arrived I tried to get it working but it constantly showed 5990 RPM. Even the electronics techos at work couldn't get it working. So I contacted Banggood and told them the story. No problems, they are sending me another one. Hopefully it will work a bit better than the first one.
For some reason I didn't even look on ebay at the time.
If I had I would have paid the extra $4 to get one that was already here in Aus.
peter
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21st Apr 2019, 09:12 AM #13Philomath in training
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I guess the relevant question is whether your mill has a fixed speed gear box (or belts) and you just want to check the speed occasionally, or whether it is variable speed and needs near constant checking.
Michael
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21st Apr 2019, 09:27 AM #14Member: Blue and white apron brigade
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I have an optical tacho purchased more than 12 years ago - I've used it a lot on motor HP measurements where it stays on for 1/2hr periods or so at a time - its still running from the same battery it came with. The optical ones can suffer from false readings if a second or high reflectivity patch is picked up. This can be checked by placing a second reflective patch on the rotating object and the readout should double - if not you have a reflective patches involved. Running or painting a dark non reflective stripe around shafts etc and placing the reflective patch on the dark stripe is a way around it.
I'm also after something a little more permanent. Will give one of those inductive ones a go.
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3rd May 2019, 03:46 PM #15Most Valued Member
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Well my replacement Tacho arrived from Banggood recently. Just got to try it out. Wired it up how I believe to be the correct way and got exactly the same result as the first one.
So that means I'm either wiring it up incorrectly or by some massive fluke I have been sent two faulty ones.
So can someone tell me the correct way to wire these please? The directions are, typically for China origin stuff, not very clear.
This pic is what I got directly from the Banggood listing.
screen tacho 01.jpg
This one is the new one (replacement) I have on the bench
screen tacho 01.jpg
So I have 12V + going to terminal no 1
12V- _ to terminal no 2
Sensor Brown going to term no 1
Blue going to term no 3
Black going to term no 5
Terminal 4 is not used
The red LED at the back of the sensor lights up but the readout immediately goes to around 5997 RPM.
With the magnet attached to my drill chuck and the drill running the readout fluctuates all over the place.
Any help would be greatly appreciated.
thanks
Peter
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