RE: SER1 Horn Bracket

[prev] [thread] [next] [Date index for 2005/03/26]

From: Nick Condon
Subject: RE: SER1 Horn Bracket
Date: 22:23 on 26 Mar 2005

Bruce is absolutely right about commutators.

Much fuss was always made about the proper undercutting of commutators.

If the insulating mica/synthetic is proud of the copper as the copper wears
the brushes bounce off the insulator and a large part of the contact area is
lost - arcing takes place and the copper is eroded but the insulator is not.
This makes things worse and worse. It may cause weak operation or if you are
very unlucky the arcing burns out a commutator bar or heats it up enough to
spit out some of the soft solder that connects the bar to the winding and
then the whole thing fails.

I bet most modern shops do not have the skill, patience or the special tool
to undercut an old style commutator as newer types do not have this problem
as a different design/material is used. 

If you want sore hands then follow the old advice - grind down the thickness
of a hacksaw blade and use it to do the undercutting - It has to be just the
right thickness to remove all of the insulator and none of the copper.
Steady hands are needed too. 

Nick.  



To change subscription see www.landrover.net/series1/mail

(message missing)

SER1 Another odd ball....
Mark Strangways 13:16 on 23 Mar 2005

RE: SER1 Another odd ball....
Tomi Nokelainen 13:45 on 23 Mar 2005

Re: SER1 Another odd ball....
Wayne Perrin 14:09 on 23 Mar 2005

Re: SER1 Another odd ball....
Diana Alan 15:17 on 23 Mar 2005

Re: SER1 Another odd ball....
Bob and Sue Bernard 15:54 on 23 Mar 2005

RE: SER1 Another odd ball....
Tom Tollefson 16:13 on 23 Mar 2005

RE: SER1 Another odd ball....
Iain McKenzie 22:34 on 23 Mar 2005

Re: SER1 Another odd ball....
Diana Alan 00:04 on 24 Mar 2005

Re: SER1 Another odd ball....
Allan Harding 00:27 on 24 Mar 2005

Re: SER1 Another odd ball....
Diana Alan 00:54 on 24 Mar 2005

Re: SER1 Another odd ball....
Allan Harding 01:40 on 24 Mar 2005

RE: SER1 Another odd ball....
Mark Strangways 09:21 on 24 Mar 2005

RE: SER1 Another odd ball....
Tom Wykes 09:24 on 24 Mar 2005

Re: SER1 Another odd ball....
Diana Alan 09:36 on 24 Mar 2005

Re: SER1 Another odd ball....
Tom Wykes 09:48 on 24 Mar 2005

Re: SER1 Another odd ball....
Diana Alan 09:56 on 24 Mar 2005

Re: SER1 Another odd ball....
MARTIN 10:42 on 24 Mar 2005

RE: SER1 Another odd ball....
Tomi Nokelainen 11:09 on 24 Mar 2005

RE: SER1 Another odd ball....
Graeme Aldous 11:51 on 24 Mar 2005

RE: SER1 Another odd ball....
Tomi Nokelainen 13:11 on 24 Mar 2005

Re: SER1 Another odd ball....
Diana Alan 13:34 on 24 Mar 2005

SER1 Horn Bracket
MARTIN 10:18 on 25 Mar 2005

Re: SER1 Horn Bracket
GRAHAM WOOD 20:02 on 25 Mar 2005

Re: SER1 Horn Bracket
MARTIN 20:21 on 25 Mar 2005

Re: SER1 Horn Bracket
Bruce Stewart 21:42 on 25 Mar 2005

RE: SER1 Another odd ball....
Graeme Aldous 13:52 on 24 Mar 2005

Re: SER1 Horn Bracket
MARTIN 09:06 on 26 Mar 2005

Re: SER1 Horn Bracket
Bruce Stewart 22:02 on 26 Mar 2005

RE: SER1 Horn Bracket
Nick Condon 22:23 on 26 Mar 2005

Re: SER1 Horn Bracket
Bruce Stewart 23:08 on 26 Mar 2005