R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 02-17-2004, 04:51 PM   #1
Tech Rookie
 
Join Date: Mar 2003
Location: UK
Posts: 11
Default Motor not working!! Racing tomorrow night!

Hi,
Can you help me? when i press the throttle on my rc car the motor does not turn, though if i hold down the throttle and turn the spur gear it starts up. but if i stop the motor then it wont start again until i have turned the spur gear to starte it up, what can i do to make it work properly?

I have tried a different motor and that is fine, so it is definately a motor problem. It had just had the comm skimmed and the brushes and springs changed. I have tried a different endbell, armature, springs and brushes but to no avail, it still doesn't work, please help me

Thank you

Jack Varty
jackv202 is offline   Reply With Quote
Old 02-17-2004, 04:57 PM   #2
Tech Elite
 
sosidge's Avatar
 
Join Date: Dec 2001
Location: Bristol, UK
Posts: 3,865
Default

It sounds like a classic sticky brush.

I was going to say "check that the brushes move smoothly in the brush hoods" - but you say you've changed everything except the can.

This doesn't make sense - fresh brushes, cut comm and brushes that move freely in their slots should stop a sticky brush.

Try again, or use that other motor you've stripped parts off.
sosidge is offline   Reply With Quote
Old 02-17-2004, 05:09 PM   #3
Tech Elite
 
fatdoggy's Avatar
R/C Tech Charter Subscriber
 
Join Date: Aug 2001
Location: MD USA
Posts: 3,642
Default

Did you round the com slot edges with a ball point pen? Generally after a cutting the comm there is excess filings in the comm slots and you have to clean then out and then round the edges slightly. I'd say tear it down and check everything. Also if you didn't give it time to run-in at a low voltage you can have problems with sticking. That has only been a problem for me though when the motor is at full throttle. Another possibility is a loose magnet, make sure there ok and arn't moving around.
fatdoggy is offline   Reply With Quote
Old 02-17-2004, 05:28 PM   #4
Tech Addict
 
racer's Avatar
 
Join Date: Oct 2002
Location: ADVAN Le Mans Project
Posts: 707
Default

check your gear mesh, also check to see if the screws you used to mount the motor are not touching the moving parts inside
racer is offline   Reply With Quote
Old 02-17-2004, 06:04 PM   #5
Tech Addict
 
Barry White's Avatar
 
Join Date: May 2002
Location: HEAVEN
Posts: 720
Default

FAST, CALL 911!!!
Barry White is offline   Reply With Quote
Old 02-17-2004, 08:49 PM   #6
Tech Adept
 
Join Date: May 2003
Posts: 170
Default

Get a multimeter and check for continuity between the three comm segments. You should have continuity between all the comm segments. It is possible that the tang clamping on one of the wires is not making good contact. This will cause the problem you're having. Carefully clamping down on the defective tang with a set of pliers will usually solve the problem.
calvin is offline   Reply With Quote
Old 02-17-2004, 09:20 PM   #7
Tech Master
 
Tek Nickal's Avatar
 
Join Date: Jan 2004
Location: Earth
Posts: 1,301
Default

Sounds like the hung brush problem but the brush moves freely inside the hood. Weird.
Tek Nickal is offline   Reply With Quote
Old 02-17-2004, 09:36 PM   #8
Tech Elite
 
edseb's Avatar
 
Join Date: Jan 2004
Location: Laguna Niguel, California
Posts: 2,421
Default

Outside chance, but also check to see if the transmission is too bound, so once you get it going it continues with momentum. If running belts, check the wheels, etc. Also, check the brush shunts and make sure they aren't hung up on something. Check for pebbles in the gears too. Could be a few other things too.
edseb is offline   Reply With Quote
Old 02-17-2004, 09:37 PM   #9
Tech Master
 
Tek Nickal's Avatar
 
Join Date: Jan 2004
Location: Earth
Posts: 1,301
Default

Quote:
Originally posted by edseb
Outside chance, but also check to see if the transmission is too bound, so once you get it going it continues with momentum. If running belts, check the wheels, etc. Also, check the brush shunts and make sure they aren't hung up on something. Check for pebbles in the gears too. Could be a few other things too.
He said he tried another motor and it worked fine. So yea.
Tek Nickal is offline   Reply With Quote
Old 02-17-2004, 09:51 PM   #10
Tech Elite
 
fatdoggy's Avatar
R/C Tech Charter Subscriber
 
Join Date: Aug 2001
Location: MD USA
Posts: 3,642
Default

It may need more then a skim to make it perfectly round if it's been run more then a few times.
fatdoggy is offline   Reply With Quote
Old 02-17-2004, 11:13 PM   #11
Tech Champion
 
Still Bill's Avatar
 
Join Date: Jan 2004
Location: Reno, NV
Posts: 7,236
Trader Rating: 12 (100%+)
Default Re: Motor not working!! Racing tomorrow night!

Quote:
Originally posted by jackv202
Hi,
It had just had the comm skimmed...Jack Varty
Jack,

This can happen with one dead pole on the armature.

If having the "comm skimmed" means it was cut down on a lathe, did one of the pole wires get severed on the other end of the armature from the commutator? Have seen it happen when that end of the armature hits the lathe's support block while being cutdown on an improperly setup lathe?
__________________
Constantly evolving CRC WGT and WGT-R/T...Carpet & Asphalt...All thanks to Team CRC.

And a pair of Associated B6 buggies for turf and clay tracks.

Last edited by JRX-S Bill; 02-17-2004 at 11:26 PM.
Still Bill is offline   Reply With Quote
Old 02-17-2004, 11:25 PM   #12
Tech Elite
 
JusBox's Avatar
 
Join Date: Sep 2003
Location: Central VA
Posts: 2,170
Trader Rating: 1 (100%+)
Default

just buy a new motor if you really need to. Might be easier than trouble shooting this one if you dont' have the time.
JusBox is offline   Reply With Quote
Old 02-17-2004, 11:41 PM   #13
Tech Adept
 
MrEs's Avatar
 
Join Date: Sep 2003
Location: Melbourme, Australia
Posts: 170
Send a message via ICQ to MrEs
Default

go to the shop and buya new motor
then come back to fixing this one, then you'll have two mototrs because ur eventually going to use this one up and throw it for a new one anyway.
MrEs is offline   Reply With Quote
Old 02-18-2004, 06:55 AM   #14
Tech Fanatic
 
Join Date: Oct 2003
Location: Waterford, MI
Posts: 825
Trader Rating: 4 (100%+)
Default

Make sure you don't have a loose magnet and it is rubbing on the arm.
__________________
Currently taking a break from R/C, running 1/1 scale cars, they are cheaper then running Modified TC!!!
retired from RC in 2007, running 1:1 scale now
[email protected]
Greg Anthony is offline   Reply With Quote
Old 02-18-2004, 10:38 AM   #15
Tech Elite
 
Join Date: Nov 2002
Location: CORONA , CALIF.
Posts: 4,054
Trader Rating: 1 (100%+)
Talking jackv202..

try using another arm from another motor just to see if it works ,, if it does , buy another arm ,, i cant say how the motor will run but at least youll have a good practice motor....good luck..
__________________
Mark Barden .
mb racer is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Anyone racing tomorrow? Mid North Coast NSW AUS 05.04.08 pracy Nitro Off-Road 1 04-05-2008 03:47 PM
Want to go racing.. like tomorrow? Seyruuen R/C Items: For Sale/Trade 16 03-18-2008 05:27 PM
New STS motor not working ScottishRacer Nitro On-Road 16 02-22-2004 01:14 PM
New STS motor not working ScottishRacer Rookie Zone 3 02-20-2004 05:56 PM
3PK 6V requirements - HELP racing tomorrow! wrxmy99 Electric On-Road 0 07-11-2003 09:56 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 05:23 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net