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  1. #1
    Join Date
    Oct 2015
    Location
    melbourne
    Posts
    420

    Default I know why my lathe doesn't work...

    16296238626036804401688147894417.jpg
    Spot the difference...

    Anyone know where i can get replacements? 10x3.4, > 13long. Spring 25mm long, 6.4mm dia.
    Ebay isn't my friend, can't find anything that thin.
    Attached Images Attached Images
    Last edited by russ57; 22nd Aug 2021 at 08:18 PM. Reason: Better photo

  2. #2
    Join Date
    Mar 2012
    Location
    South Australia
    Posts
    25

    Default

    Get some vacuum cleaner brushes eg those used on Electrolux etc and re solder them to the braided wire coming from the end cap. You may need to file the brushes to fit. Most electric motor re winders / repairers would have them.

  3. #3
    Join Date
    Aug 2019
    Location
    Revesby - Sydney Australia
    Age
    54
    Posts
    466

    Default

    I'll check my spares (which have mostly come from side of the road throw out chop saws, etc).

    In the past I have also sanded/filed the graphite blocks down to fit.
    I think I learnt that trick from my Dad?

  4. #4
    Join Date
    Oct 2015
    Location
    melbourne
    Posts
    420

    Default

    I might have to go that path.
    What concerns me is the motor is supposed to be 750w which seems high for the size of the brushes, so they could be (supposed to be at least) copper loaded.

  5. #5
    Join Date
    Dec 2013
    Age
    54
    Posts
    1,212

    Default

    I have brushes here bought in the 10 pack from eBay etc, what size are the brushes?

    Sent from my 5007U using Tapatalk
    Using Tapatalk

  6. #6
    Join Date
    Oct 2015
    Location
    melbourne
    Posts
    420

    Default

    10mm wide 3.4mm thick

    With 25mm spring preferably as it looks like the failed one may have the wrong spring

  7. #7
    Join Date
    Dec 2013
    Age
    54
    Posts
    1,212

    Default

    Quick search on eBay I found these, very easily filed down to size. AliExpress would have heaps more sizes

    Sent from my 5007U using Tapatalk
    Using Tapatalk

  8. #8
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    4,978

    Default

    Hi Russ, Guys,

    I've been making replacement carbon brushes for quite some time ! My mill motor uses similar brushes, but I can't fit pigtails to them so I have to rely on the springs and surface contact to carry the motor current.

    01-09-2019-002.jpg

    These are a couple of the worn down brushes from my 750W mill motor. You can see that the springs take a bit of hammering from the motor current ! Actually this is good in so much that when the springs fail there is no danger of them running into the armature.

    09-09-2019-012.jpg 09-09-2019-003.JPG 09-09-2019-004.jpg

    These three pictures show a rather large carbon brush that was given to me by a motor re-winder. They are much too big, so I cut them down using the bandsaw and then sand them down to the correct thickness. When cut they are twice the needed length.

    Each pair lasts around a year before the spring fails. In the first picture there is a new one and a worn down one. The springs very conveniently are from Hoover vacuum cleaner motor brushes. The Hoover brushes are square in section and far too small to use.

    All the dealers I've tried don't want to sell you carbon brushes, but are happy to rip you off for a new motor.
    Best Regards:
    Baron J.

  9. #9
    Join Date
    Jul 2006
    Location
    Athelstone, SA 5076
    Posts
    4,117

    Default

    Quote Originally Posted by BaronJ View Post
    Hi Russ, Guys,

    I can't fit pigtails to them so I have to rely on the springs and surface contact to carry the motor current.
    That sounds horribly dodgy....but hey...if it works, why not lol

  10. #10
    Join Date
    Apr 2018
    Location
    Perth
    Posts
    100

    Default

    Quote Originally Posted by eskimo View Post
    That sounds horribly dodgy....but hey...if it works, why not lol
    Most large DC motors use that method. easy to change as just pull back the spring , remove old brush and pop in new one. Only small dc and ac motors use pigtails and coil springs.

  11. #11
    Join Date
    Apr 2018
    Location
    Drouin Vic
    Posts
    382

    Default

    If there's someone near you who does power tool repairs they will probably have a drawer full of various brushes, might be worth a shot.

  12. #12
    Join Date
    Oct 2015
    Location
    melbourne
    Posts
    420

    Default

    Since I never throw anything away, i may have a couple of dead brushed motors hiding somewhere.

  13. #13
    Join Date
    Dec 2011
    Location
    Sydney
    Posts
    435

    Default

    My son's 'under the desk' type treadmill started to make a penetrating whistling noise - coming from the motor brushes.
    Despite being 6 months old and under warranty the supplier did not seem to be able to send out spares, so they just sent out a new motor, which after a bit also whistled!
    Searched around and as expected found an online repairer with a photo of an identical DC motor, but when I phoned about brushes for it the answer was they never keep them because there is no call for brushes because the motors (and brushes) never wear out, presumably because the treadmills are thrown out first.
    We fixed the whistling noise - sort of -with strategically placed damping.
    Online searches revealed that for some reason the UK seems to be the best place to go for replacement brushes....
    AC DC CARBON BRUSHES AUTO MARINE LATHE MADE TO ORDER and Carbon Brushes for Sale with Free UK Delivery - Top Deals Online

    Bill

  14. #14
    Join Date
    Dec 2011
    Location
    Sydney
    Posts
    435

    Default

    I meant to add that I vaguely remember (accurately I hope) that one of the websites mentioned allows searching for brushes by their dimensions, and with a bit of luck you may find that something from a common power tool is just a bit bigger than what you need. Then it's out with the file and emery...
    Bill

  15. #15
    Join Date
    Aug 2007
    Location
    Saskatoon, Saskatchewan, Canada
    Posts
    253

    Default

    I would contact Little Machine Shop and ask them for help. If they don't have them they would know where they could be found. https://littlemachineshop.com/default.php

    Maybe this one of theirs could be sanded to size.
    https://littlemachineshop.com/produc...5089&category=

    Pete

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