R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 05-17-2007, 06:25 AM   #1
Tech Adept
 
16skyline's Avatar
 
Join Date: Nov 2006
Posts: 195
Default BRUSHES

Does any one cut there brushes on the trailing and leading edges. Do you get better performance when doing this, also which way do you cut them.( for example positive side cut on trailing or leading edge)?
16skyline is offline   Reply With Quote
Old 05-17-2007, 07:48 AM   #2
Super Moderator
 
Marcos.J's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2003
Location: Semper Fi
Posts: 27,187
Trader Rating: 182 (100%+)
Default

Quote:
Originally Posted by 16skyline
Does any one cut there brushes on the trailing and leading edges. Do you get better performance when doing this, also which way do you cut them.( for example positive side cut on trailing or leading edge)?
you ll get better answer asking on the here Eric Anderson here http://www.rctech.net/forum/showthread.php?t=44983 or EddieO here http://www.rctech.net/forum/showthread.php?t=51001
Marcos.J is offline   Reply With Quote
Old 05-17-2007, 10:30 AM   #3
Tech Regular
 
Todd Putnam's Avatar
 
Join Date: May 2003
Posts: 392
Default

Quote:
Originally Posted by 16skyline
Does any one cut there brushes on the trailing and leading edges. Do you get better performance when doing this, also which way do you cut them.( for example positive side cut on trailing or leading edge)?
If you remove material from the trailing edge of each brush, (similar to a "timed" cut) torque and rpm increases, which increases watts, (electrical horsepower.)

If you remove material from the leading edge, torque increases, and amp draw and rpm decreases. If you increase torque to a greater degree than you decrease RPM, your overall watts will increase.

You can gain performance by utilizing the above information. I'd suggest keeping the brush faces symetrical, ie: keep the brush cuts/widths the same for both poles.
__________________
.
www.rcspeedshop.com

"Where The Fast guys Shop"
Putnam Propulsion Competition Motors and Accessories
Todd Putnam is offline   Reply With Quote
Old 05-17-2007, 11:27 AM   #4
Tech Addict
 
Tsquare's Avatar
 
Join Date: Sep 2004
Location: San Diego
Posts: 618
Trader Rating: 4 (100%+)
Default

Quote:
Originally Posted by Todd Putnam
If you remove material from the trailing edge of each brush, (similar to a "timed" cut) torque and rpm increases, which increases watts, (electrical horsepower.)

If you remove material from the leading edge, torque increases, and amp draw and rpm decreases. If you increase torque to a greater degree than you decrease RPM, your overall watts will increase.

You can gain performance by utilizing the above information. I'd suggest keeping the brush faces symetrical, ie: keep the brush cuts/widths the same for both poles.
Hi Todd,

Is it possible to post a picture / pictures of your examples given above. Would be greatlly appreciated.
Tsquare is offline   Reply With Quote
Old 05-17-2007, 02:26 PM   #5
Tech Adept
 
16skyline's Avatar
 
Join Date: Nov 2006
Posts: 195
Default

So when you look into the motor can at the end bell end, the trailing edge is the right hand side off the brushes?
16skyline is offline   Reply With Quote
Old 05-17-2007, 02:38 PM   #6
Tech Master
 
Charles Godwin's Avatar
 
Join Date: May 2005
Location: UK (England)
Posts: 1,129
Trader Rating: 2 (100%+)
Default

The trailing edge is the left side of the brush if you look into the brush hoods

Charles
__________________
DXR | CML Distribution | Paint by Turnip Paint | TKRgraphics.com
Charles Godwin is offline   Reply With Quote
Old 05-17-2007, 02:57 PM   #7
Tech Elite
 
Skiddins's Avatar
 
Join Date: Feb 2006
Location: Windsor, UK
Posts: 4,761
Default

If you look at the endbell with one brush to the left and one to the right, the trailing edge will be the top left on the left hand side and bottom right on the right hand side.

Skiddins
__________________
Xray T4'18, T4'14 (Wet Car)
Xray X12 2018
Xray X1'16
wlrc.co.uk (West London Racing Centre)
RCDisco.co.uk
Skiddins is offline   Reply With Quote
Old 05-18-2007, 04:12 AM   #8
Tech Adept
 
16skyline's Avatar
 
Join Date: Nov 2006
Posts: 195
Default

So is this different for the motors that spring post are on the same side and the post on the angle from each other.
16skyline is offline   Reply With Quote
Old 05-18-2007, 04:14 AM   #9
Tech Adept
 
16skyline's Avatar
 
Join Date: Nov 2006
Posts: 195
Default

I have had a chance to look at a motor, the postive brush needs to be cut on the bottom if you are look at the end bell and the negative is the top?
16skyline is offline   Reply With Quote
Old 05-18-2007, 05:08 AM   #10
Tech Champion
 
tc3team's Avatar
 
Join Date: Mar 2006
Location: UK
Posts: 6,151
Default

If you're not sure how to do it yourself, see if you can have a word with one of the A main guys at your local club and ask if they can do it for you

Brushes are pretty cheap, but get it wrong and you'll either screw up the commutator or loose performance.
__________________
Fusion Hobbies / www.horshamrc.org

The wife stops me being sane and the r/c stops me from going insane....
tc3team is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
767 brushes! RCing15 R/C Items: For Sale/Trade 1 08-12-2007 11:40 PM
Brushes OZracer Australia Wanted to Buy 0 11-29-2006 08:35 AM
19 TURN MOTORS, STOCK MOTORS, 767 BRUSHES, F BRUSHES, 2 MOTOR CASES LOSIMANJRXS R/C Items: For Sale/Trade 47 10-21-2006 06:06 AM
Brushes for a KR stulec52 Electric On-Road 11 08-11-2004 12:33 AM
Trinity Brushes, Brushes, Brushes Tornado_Racing R/C Items: For Sale/Trade 5 03-04-2004 08:48 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 04:08 AM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net