Page 1 of 3 123 LastLast
Results 1 to 15 of 31
  1. #1
    Join Date
    Oct 2011
    Location
    Sydney, NSW
    Posts
    1,249

    Default 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.

  2. #2
    Join Date
    Aug 2006
    Location
    Melbourne
    Posts
    1,105

    Default

    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

  3. #3
    Join Date
    Sep 2008
    Location
    Riddells Creek, Vic.
    Posts
    831

    Default

    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

  4. #4
    Join Date
    Oct 2004
    Location
    Glen Forrest, Western Australia
    Age
    62
    Posts
    80

    Default

    Quote Originally Posted by Techo1 View Post
    Then 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
    I used almost exactly the same unit as sugested by ComVC on my two wood lathes. One thing I did find with those units was that when i mounted the sensor in a metal bracket it gave irratic readings but as soon as made plastic brackets for them the readings were solid

    Rick

  5. #5
    Join Date
    Aug 2011
    Location
    Melbourne
    Posts
    4,779

    Default

    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.

    Simon
    Girl, 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.

  6. #6
    Join Date
    Oct 2011
    Location
    Norwood-ish, Adelaide
    Age
    59
    Posts
    6,540

    Default

    You can't just use an optical tacho from ebay? Cheap, self contained and no working out why the electrons won't behave.

    Michael

  7. #7
    Join Date
    Aug 2006
    Location
    Melbourne
    Posts
    1,105

    Default

    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.

  8. #8
    Join Date
    Oct 2011
    Location
    Sydney, NSW
    Posts
    1,249

    Default

    Quote Originally Posted by Com_VC View Post
    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.
    I like this, much more suited to my electrical abilities.

  9. #9
    BobL is offline Member: Blue and white apron brigade
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    7,182

    Default

    Quote Originally Posted by Com_VC View Post
    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
    How well do those things work at slow speeds. I seem to recall that type struggled below 100 rpm?

  10. #10
    Join Date
    Sep 2008
    Location
    Riddells Creek, Vic.
    Posts
    831

    Default

    Quote Originally Posted by BobL View Post
    How well do those things work at slow speeds. I seem to recall that type struggled below 100 rpm?
    No problem at all at low speed with mine using an Inductive Sensor.

  11. #11
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,436

    Default

    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.

  12. #12
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    65
    Posts
    1,669

    Default

    Quote Originally Posted by Com_VC View Post
    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
    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

  13. #13
    Join Date
    Oct 2011
    Location
    Norwood-ish, Adelaide
    Age
    59
    Posts
    6,540

    Default

    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

  14. #14
    BobL is offline Member: Blue and white apron brigade
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    7,182

    Default

    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.

  15. #15
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    65
    Posts
    1,669

    Post

    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

Page 1 of 3 123 LastLast

Similar Threads

  1. Replies: 27
    Last Post: 15th Oct 2014, 08:34 AM
  2. High Speed Spindle for the Mill
    By RayG in forum METALWORK GENERAL
    Replies: 10
    Last Post: 11th Sep 2012, 02:44 AM
  3. Mini lathe/mill project No.1 Saw arbor
    By neksmerj in forum METALWORK GENERAL
    Replies: 11
    Last Post: 20th May 2012, 11:38 AM
  4. Dial Indicator Set up for Hercus Mill
    By Abratool in forum METALWORK GENERAL
    Replies: 11
    Last Post: 16th May 2012, 09:39 PM
  5. Mini lathe/mill project No.2 Fly cutter
    By neksmerj in forum METALWORK GENERAL
    Replies: 1
    Last Post: 9th Mar 2009, 01:11 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •