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Thread: Tachometer on Hercus 9C
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8th Jan 2020, 04:08 PM #1Diamond Member
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Tachometer on Hercus 9C
My Hercus seems a little slow for cutting steel, so I wanted to check the rotational speed. Could have borrowed an optical tacho, but a cheap tacho display with sensor is $14 or less from eBay, so I thought I would hook one up.
What Pic Note Buy the gizmo, work out the wiring.
Chinese symbols on the 5 pins, and no doco.
Had to search the web for part number,
to find someone else's pinout diagramsIMG_0454.jpg Sensor has 3 wires,
power is 2 wires,
but pin4 on display unused!!!Sensor uses a small magnet.
Lost the round one that came with it -
flew off somewhere when testing on a
high RPM spindle motor - had to improvise.
Part of rare-earth magnet from a disk drive.
Try to work out where to put it.
Spindle take-up nut?
Bull nose pin thingy?IMG_0455.jpg
IMG_0457.jpgSmashed up the
magnet holder
with a hammer.
Got a tiny little flat triangle!Seems to work OK on spindle take-up nut IMG_0456.jpg Middle speed ~350RPM Thought I would check the motor speed also IMG_0458.jpg Different magnet fragment but it was a bit more unreliable... IMG_0459.jpg
IMG_0460.jpg
IMG_0461.jpgturned magnet around and got expected RPM IMG_0463.jpg
So, I might make a little box and mount this near the rear belt pulley, but I gotta work out a power supply
(this lathe motor is 3phase without a neutral, so local 240v transformer is a challenge)
Anyway, with my current motor pulley, these are my spindle speeds...
Belt position back geared straight Right: 38 RPM 207 RPM Middle: 66 RPM 355 RPM Left: 117 RPM 629 RPM
"Textbook of turning" says 750RPM max., so I guess I am close to the original speeds, but a bigger motor spindle would be handy
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8th Jan 2020, 04:56 PM #2Member: Blue and white apron brigade
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You might like to see how I have mounted mine.
https://metalworkforums.com/f189/t203548-tacho-hercus
I've power mine from a 24V output available on my VFD and have done the same on my DP and WW lathe.
With etc VFD able to run to 120Hz I can get up to 1500 rpm out of mine but as it's a plain bearing Hercus I only do this for very brief periods
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8th Jan 2020, 08:27 PM #3Diamond Member
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Thanks Bob.
My drive system and belts are quite horizontal:
IMG_1688.jpg
so I'm not sure I will mount my sensor vertically like that, as I was hoping to put a shelf or Perspex™ sheet over the top.
VFD for 24V? Luxury!
(My man cave has 3ø, so I'm using a fat 4-conductor cable straight to the switch & motor.)
I'll eventually design a HV step-down power supply.
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8th Jan 2020, 08:36 PM #4Member: Blue and white apron brigade
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8th Jan 2020, 08:39 PM #5Diamond Member
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8th Jan 2020, 10:40 PM #6Most Valued Member
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Don't you have any 240V PPs near the lathe???
KrynTo grow old is mandatory, growing up is optional.
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8th Jan 2020, 10:47 PM #7Diamond Member
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9th Jan 2020, 12:02 AM #8Member: Blue and white apron brigade
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9th Jan 2020, 01:43 AM #9Golden Member
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Get yourself a transformer like this https://www.ebay.com.au/itm/TRANSFOR...frcectupt=true
You can use two of the phases to drive it and get 12V out.
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9th Jan 2020, 06:39 AM #10Diamond Member
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Mount an RCD Powerboard close by to the lathe and just run a plug pack as BobL suggested. You can you the extra power points for a work light and coolant later on.
https://www.ebay.com.au/itm/Clipsal-RCD-Protected-485P4CB30-Socket-Outlet-250V-10A-30mA-safety-powerboard/324013193159?hash=item4b70b0f7c7:g:AoUAAOSwcqFdiLVi&frcectupt=true
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9th Jan 2020, 10:54 AM #11Senior Member
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You don't happen to have the wiring diagram you used for the tacho?
As you know, the wiring diagram is non-existent with them as supplied and I've failed getting those to power up without blowing something on the board in the various internet searches I've used. I'd like to have a working one on my X3 mill but was reluctant to try again as I've killed two.
Thanks.
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9th Jan 2020, 11:27 AM #12Diamond Member
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Try this Thread.
https://metalworkforums.com/f309/t20...indicator-mill
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9th Jan 2020, 06:58 PM #13Diamond Member
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9th Jan 2020, 07:02 PM #14Diamond Member
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and, to save you searching through the thread Com_VC pointed us to, https://metalworkforums.com/attachme...2&d=1556859139
"Source" on that is external power. Positive goes to both the display and one wire of the sensor. Try it with 12V battery before trying any sort of plug pack (which has to be DC, probably DC regulated. Not AC)Last edited by nigelpearson; 9th Jan 2020 at 07:04 PM. Reason: explained the woring diagram link
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9th Jan 2020, 09:29 PM #15Diamond Member
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12V from Three Phase
After spending some more web search time, I finally found what I needed. A compact way to get 12V from high-voltage AC. $18 on eBay:
https://www.ebay.com.au/itm/AC-380V-...UAAOSwNypdmGsE
The search trick was realising that other countries have different voltages for three phase. Australia and UK 400 or 415V, USA 240/480V, Africa and half of Asia 380V. 380V seems the most common, so searching for that was fruitful.
Not a perfect solution, and for safety I will use it with a fuse, but this seems tidier than a larger 3ø transformer.
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