By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Forum House Ad Zone

No turning for me this weekend

All Topics | Latest Posts

Search for:  in Thread Title in  
JasonB15/04/2011 19:42:10
avatar
25215 forum posts
3105 photos
1 articles
Last week when using the lathe (Warco WM280 V-F) it hunted onec or twice when turning on. Tonight I went to use it and it didn't start with the speed set low, turning up the wick got it going but the motor was cutting in and out as well as running faster than normal at full setting, also thought I could hear one or two electrical "pops" from the back.
 
I have read of circuit boards going on these variable lathes and mills so started to fear the worst but also remembered reading of uneven brush wear so decided this was the place to look.
 

As you can see the brush on the right is a lot shorter, the contact surface is heavily pitted and the spring has actually broken/melted.
 
Hopefully Warco will have new ones in stock when I give them a call on monday. Just thought I would post this for anyone elese with a similar variable speed lathe if their motor starts playing up so they know where to look.
 
Jason (off to find something to mill instead)
Mark P.16/04/2011 09:24:17
avatar
634 forum posts
9 photos
Hi Jason,had a similar problem with my Warco WM250 lathe.The motor hunted a couple of times then stopped,on further investigation one of the brushes was worn down to almost nothing where as the other was as new.Warco sent me two sets of brushes by return. By the way the lathe was 2 years old.
 
Pailo.
modeng200016/04/2011 10:07:57
340 forum posts
1 photos
Do you think it would be good insurance to get a set of brushes before I run into this problem?
It seems surprising that one brush wears quicker than the other.
 
John
Nicholas Farr16/04/2011 10:54:01
avatar
3988 forum posts
1799 photos
Hi, I think uneven brush wear is fairly common in a lot of electric motors. My Bosch 4 1/2" angle grinder always wears one more than the other, but one good thing I like about thier brushs, is that they have a little plastic sprung loaded pin embedded into the brush which pops when they get to short, and disconnects them from the commutator, thus stops it being damaged by arc burning.
 
Getting spare brushs is always a good idea, as long as you remember where you put them when the time comes that you need them.
 
Regards Nick.

 

Edited By Nicholas Farr on 16/04/2011 10:55:20

Ian S C16/04/2011 12:21:59
avatar
7468 forum posts
230 photos
I always thought that brush type motors were suitable for intermitant use, electric hand drill, angle grinder, not for a machine that runs for long hours like a lathe. Would it not be better for the manufacturers to use a brushless DC motor in this sort of situation.
I know, this is'nt helping anyone, and its just something that bugs me, but that and a propper rated power supply. Ian S C
Windy16/04/2011 15:12:44
avatar
910 forum posts
197 photos
Something I came upon a while ago while doing the valve timing on an old ex racing friends 650cc Triumph.
It would not run properly.
I asked if the Lucas magneto was ok and was told he had fitted new carbon brushes to it.
The erratic running was traced to the magneto brushes being very soft material and coating the slip ring.

According to a magneto specialist this was a common problem with some of the carbon brushes from India.

As many of the motors we use are far Eastern are the carbon brushes of a suitable standard for prolonged use?
 
Windy.

Edited By Windy on 16/04/2011 15:13:51

Stub Mandrel20/04/2011 19:55:13
avatar
4318 forum posts
291 photos
1 articles
The new mini lathes use a bruchless DC motor. these things have only been affordable at the specs we need for a very short time!
 
Neil
JasonB20/04/2011 20:01:10
avatar
25215 forum posts
3105 photos
1 articles
Just an update.
 
I e-mailed Warco over the weekend and had a reply at 8.44 on Monday morning with teh part number I needed, cost and conformation they were in stock. Placed order and they arrived next day. Also got a spare set incase it happens again.
 
I have just fitted them and all is well and good so thumbs up to Warco for good spares service.
 
J

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Sign up to our Newsletter

Sign up to our newsletter and get a free digital issue.

You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy

Latest Forum Posts
Support Our Partners
cowells
Sarik
MERIDIENNE EXHIBITIONS LTD
Shopping Partners
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest

 

Donate

donate