Page 4 of 4 FirstFirst 1234
Results 46 to 60 of 60
  1. #46
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    61
    Posts
    1,222

    Default Magnet Polarity

    I turned the magnet over this morning. It definitely has an effect. Not quiet what I was hoping for though.
    With it turned over the tacho didn't work at all. Just sat there displaying four Zero's.
    So I changed it around again.
    Its still fluctuating. Maybe its just a heap of crap. Most of the stuff I have bought from Banggood has been ok so I suppose I have to expect a dud occasionally.
    Here's a 30 second video I took this morning. Motor running at a set frequency.

    https://youtu.be/KUzLDjr0X5o


    Peter

  2. #47
    Join Date
    Oct 2004
    Location
    Glen Forrest, Western Australia
    Age
    58
    Posts
    51

    Default

    Quote Originally Posted by bollie7 View Post
    Rick. That's interesting. I've mounted mine using an aluminium bracket, inside the change gear cover which is made from cast aluminium.
    When I first got mine I tried it out using a battery drill as a source of variable speed. BobL reckons that might not have been such a good idea.
    I have two of these so I think I'll put some time in and set one up a bit better for testing.
    peter
    Peter

    I tested all the connections, tried different power supplies and swapped sensors before making the new brackets. I think the sensors need to be isolated from everything

    Rick

  3. #48
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    61
    Posts
    1,222

    Default

    Quote Originally Posted by warrick View Post
    Peter

    I tested all the connections, tried different power supplies and swapped sensors before making the new brackets. I think the sensors need to be isolated from everything

    Rick
    Rick
    thanks for the info. I'll try it out.
    peter

  4. #49
    BobL is offline Member: Blue and white apron brigade
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    5,259

    Default

    Quote Originally Posted by bollie7 View Post
    I turned the magnet over this morning. It definitely has an effect. Not quiet what I was hoping for though.
    With it turned over the tacho didn't work at all. Just sat there displaying four Zero's.
    So I changed it around again.
    Its still fluctuating. Maybe its just a heap of crap. Most of the stuff I have bought from Banggood has been ok so I suppose I have to expect a dud occasionally.
    Here's a 30 second video I took this morning. Motor running at a set frequency.
    r
    That sounds very much like the problem I had when I accidentally touched the sensor wire with the power line - it means the sensor is cooked.
    You can buy spare sensors separately but make sure you purchase the right one - they are not all the same.

  5. #50
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    61
    Posts
    1,222

    Default

    Quote Originally Posted by BobL View Post
    That sounds very much like the problem I had when I accidentally touched the sensor wire with the power line - it means the sensor is cooked.
    You can buy spare sensors separately but make sure you purchase the right one - they are not all the same.
    I've got another sensor, I'll try it as well.
    thanks
    Peter

  6. #51
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    2,871

    Default

    Hi Peter,

    Can you post a picture of the label on your sensor please.

    Also distance can be critical as well. You could build a test rig with a wood disc holding the magnet and run it in a drill press, then adjust the sensor distance to determine how far away it needs to be.
    Best Regards:
    Baron J.

  7. #52
    BobL is offline Member: Blue and white apron brigade
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    5,259

    Default

    Most sensors have a red LED on the back of them and this lights up when the right distance is achieved.

  8. #53
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    61
    Posts
    1,222

    Default

    Quote Originally Posted by BaronJ View Post
    Hi Peter,

    Can you post a picture of the label on your sensor please.

    Also distance can be critical as well. You could build a test rig with a wood disc holding the magnet and run it in a drill press, then adjust the sensor distance to determine how far away it needs to be.
    I was going to do that tonight but I've had a big day and then with the predicted bushfire danger tomorrow, I thought it might be a god idea to clean the roof and gutters of my shed off when I got home from work. We live in suburbia and no large tracts of bush nearby (couple of Klms) but embers can travel a fair way so better to be safe than sorry.
    I've had a look through my pics but don't have a decent one. So tomorrow arvo hopefully.
    peter

  9. #54
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    2,871

    Default

    Hi Peter,

    I only found out about the bush fires, from the news on TV today !

    Looking after yourself and family are more important than a picture ! I wish we could swap some of our rain for your dry weather for a while.
    Best Regards:
    Baron J.

  10. #55
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    61
    Posts
    1,222

    Default

    Quote Originally Posted by BaronJ View Post
    Hi Peter,

    I only found out about the bush fires, from the news on TV today !

    Looking after yourself and family are more important than a picture ! I wish we could swap some of our rain for your dry weather for a while.
    Thanks
    We are ok but there are plenty of others on this forum who could be (maybe have been) effected.
    The biggest problem for us is the smoke. If that's the only problem we have then I'll be happy.
    I feel for those who have last their homes and, with some, even loved ones.
    Its also pretty devastating thinking about the wild life (and domesticated animals) that have been killed. Then there will probably be some who survive the fire only to die of injuries or starve to death afterwards with nothing to eat.

    Edit. Sensor pics added. As the label is wrapped around the sensor Ive had to take four pictures so the info can be read.

    sensor 01.jpgsensor 02.jpgsensor 03.jpgsensor 04.jpg
    peter
    Last edited by bollie7; 12th Nov 2019 at 06:36 PM. Reason: added pics

  11. #56
    Join Date
    Aug 2011
    Location
    Melbourne
    Posts
    4,209

    Default

    Take care Peter.

    Sent from my SM-G970F using Tapatalk
    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.

  12. #57
    Join Date
    Oct 2004
    Location
    Glen Forrest, Western Australia
    Age
    58
    Posts
    51

    Default

    Peter,
    here is the bracket I made if this helps, The magnet holds itself onto the pulley (hasn't come off yet even at 3000rpm)
    I used a spare piece of smoke coloured perspex and heated it with a heat gun and bent it over a piece of timber, drilled my holes first
    Rick



    20181109_144812 (Medium).jpg

  13. #58
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    61
    Posts
    1,222

    Default

    Quote Originally Posted by simonl View Post
    Take care Peter.

    Sent from my SM-G970F using Tapatalk
    Thanks Simon.
    We are not in a fire area, thankfully. The only advantage of living in suburbia. There are bush areas a couple of klms away but they are the sort of thing you get in scattered pockets. I do really feel for the poor buggers who have lost their homes etc though.

  14. #59
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    61
    Posts
    1,222

    Default

    Quote Originally Posted by warrick View Post
    Peter,
    here is the bracket I made if this helps, The magnet holds itself onto the pulley (hasn't come off yet even at 3000rpm)
    I used a spare piece of smoke coloured perspex and heated it with a heat gun and bent it over a piece of timber, drilled my holes first
    Rick



    20181109_144812 (Medium).jpg
    Thanks for the pic Rick. I might end up having to something similar with mine however I suspect I might have killed the sensor when I first got it trying it out. The first one I got everything was in chinese on it, so I think as I'm didn't know much about them, I probably wired it up incorrectly.
    peter

  15. #60
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    2,871

    Default

    Hi Peter, Guys,

    Thank you for the pictures, I've not found any new information about them. I hadn't realised that there was a LED tell tale at the cable end. Simply waving a magnet around the front should cause the led to flash when power is applied. However if the led is faulty, you might be able to see a voltage transition on the output lead using a multimeter. If it doesn't then I agree its dead.

    The display should be OK though. I don't know of a simple way to test that, though I can tell you that it is identical to the one on the mill and that takes input from an optical slot sensor.
    Best Regards:
    Baron J.

Page 4 of 4 FirstFirst 1234

Similar Threads

  1. Looking for tool advise
    By Lagair in forum METALWORK GENERAL
    Replies: 8
    Last Post: 6th Aug 2018, 09:23 PM
  2. Advise On Trailers
    By Christos in forum TRAILERS & OTHER FABRICATED STUFF
    Replies: 17
    Last Post: 18th Feb 2018, 09:49 AM
  3. Very first TIG welds. please advise
    By Zumanity in forum WELDING
    Replies: 5
    Last Post: 9th May 2014, 03:28 PM
  4. advise need please
    By boyblueeye in forum WELDING
    Replies: 8
    Last Post: 13th May 2012, 12:22 AM
  5. Powdercoating advise
    By Geoff Dean in forum METALWORK GENERAL
    Replies: 7
    Last Post: 26th Jan 2006, 11:03 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
  •