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#Post#: 812--------------------------------------------------
Re: New member says hello
By: banquo Date: June 10, 2015, 6:46 am
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No such thing as a pest on here.. ;)
I suspect that the issue is more than the cable.
I still have the original cable on mine, although I bought a
spare from NLM that hasn't been fitted yet.
My cable also springs a bit, and it will come right back, almost
to the bar if pulled hard.
However, it's never been so bad as to worry me, and it's more to
do with how much I have to wind the adjuster out to prevent
binding.
I get excellent results on the brake test at the MOT, always
managing to lock the wheel.
If your front shoes are new, they won't be bedded into the drum,
and that will take some time, especially as the shoes won't have
been machined to match the exact drum diameter.
If the cable is a good match to the lever (so there's not too
much slop between the nipple and the locator) it may just be
that the linings need bedded in.
One other point; check the orientation of the brake arms on the
backplate splines. They should be just shy of vertical, so they
pass through vertical at about mid lever travel, to minimise the
force required for maximum braking effort.
My front brake was practically useless on delivery, but after
bedding in, adjusting the lever position, and the TLS adjuster,
it's now pretty good.
You can obtain a new cable from NLM (I did that, because my
nipple soldering results have never been good) but I don't know
if that will be any better than what you have.
If you're into making your own, then supplies are available
here:
HTML http://www.motorcycleproducts.co.uk/cable-accessories-c-334.html
HTML http://www.motorcycleproducts.co.uk/cable-accessories-c-334.html
and here:
HTML http://www.vehicle-wiring-products.eu/section.php/82/1/motorcycle-parts
HTML http://www.vehicle-wiring-products.eu/section.php/82/1/motorcycle-parts
I see the cables are available in up to 2.5mm diameter, and that
would be a lot tougher than a 2mm.
Also, Venhill will make up a cable to your specifications:
HTML http://www.venhill.co.uk/Hoses_&_Cables_-_Custom
HTML http://www.venhill.co.uk/Hoses_&_Cables_-_Custom
One final point: all cables should be supplied pre-stretched,
and the manufacture should involve a stretching process (as an
aside, I used to do work for Bruntons in Musselburgh who made
the cables for the Forth Road Bridge, and they had a railway
that disappeared underground, to which they attached one end of
each cable, and drove it along the rails until fully stretched).
I suspect many cables now come from China or India, and not from
the old sources we're used to, and it could be that the new
cable you have needs to stretch a bit before it settles down.
You could always suspend it from the roof, and hang a heavy
weight on it!
#Post#: 813--------------------------------------------------
Re: New member says hello
By: Bruno Date: June 10, 2015, 1:03 pm
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I would be wary of making making cables,especially brake
cables.The failure of cables at the nipple are not normally due
to the soldering,it tends to be that the inner cable has not
been prepared properly.How do I know? I used to work at Venhill
Engineering,and have made thousands of cables!.We used to cast
the nipples onto the inners (I was the only person who used to
do it when I was there,and I have the scars to prove it! Molten
zinc alloy squirting out of the die is bloody painful!) all
inner cables,soldered or cast,where clamped and the end struck
by a ram to 'birdcage' the strands.This shaping of the inners
strands is what really holds the nipple on and the solder is
really just a filler.
I have a massive front brake cable on my Ambassador but it is
still a poor brake.As one expert said,'how can a brake so big
work so bad!'
The NF brake is much better.
I would suggest talking to Venhill and asking for a heavy duty
cable.They may ask you to send them the original as a pattern or
supply dimensions.
#Post#: 815--------------------------------------------------
Re: New member says hello
By: cryospeed1 Date: June 11, 2015, 1:51 am
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Hi Once again thanks for the information and advice. Ideally I
would like to know what the original levers look like, then try
to get hold of some and take the cable issue forward with
Venhill . Having the proper levers will mean I can tell them the
dimensions for ferrule and barrel nipple. If I get a venhill
cable to suit the current levers and then get hold of the proper
ones it might be back to square one again. I suppose plan B
could be to just replace both levers and handlebar electrics
with Royal Enfield stuff. Then get cables made up to suit.
Thanks again for the help
John
#Post#: 816--------------------------------------------------
Re: New member says hello
By: Bruno Date: June 11, 2015, 2:53 am
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I should have also mentioned,a Bowden (motorcycle) cable
normally flexes not because the inner stretches but because the
outer cable compresses
#Post#: 817--------------------------------------------------
Re: New member says hello
By: Bruno Date: June 11, 2015, 3:18 am
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[URL=
HTML http://s128.photobucket.com/user/bruno1955/media/levers%20006.jpg.html][IMG]http://i128.photobucket.com/albums/p194/bruno1955/levers%20006.jpg[/img][/URL]
[URL=
HTML http://s128.photobucket.com/user/bruno1955/media/levers%20007.jpg.html][IMG]http://i128.photobucket.com/albums/p194/bruno1955/levers%20007.jpg[/img][/URL]
[URL=
HTML http://s128.photobucket.com/user/bruno1955/media/levers%20008.jpg.html][IMG]http://i128.photobucket.com/albums/p194/bruno1955/levers%20008.jpg[/img][/URL]
[URL=
HTML http://s128.photobucket.com/user/bruno1955/media/levers%20009.jpg.html][IMG]http://i128.photobucket.com/albums/p194/bruno1955/levers%20009.jpg[/img][/URL]
[URL=
HTML http://s128.photobucket.com/user/bruno1955/media/levers%20010.jpg.html][IMG]http://i128.photobucket.com/albums/p194/bruno1955/levers%20010.jpg[/img][/URL]
Sorry about the focus,my camera is playing up.The nipple on the
brake lever end is 9mm diameter and 9mm long.It is a loose
barrel on a cast trumpet nipple.The brake lever is marked
'Tommaselli'
#Post#: 820--------------------------------------------------
Re: New member says hello
By: banquo Date: June 11, 2015, 8:21 am
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[quote author=Bruno link=topic=134.msg816#msg816
date=1434009193]
I should have also mentioned,a Bowden (motorcycle) cable
normally flexes not because the inner stretches but because the
outer cable compresses
[/quote]
You know Bruno, now that you have revealed that titbit, it's
incredibly obvious, but I had never even considered it.
Thanks for that!
#Post#: 822--------------------------------------------------
Re: New member says hello
By: cryospeed1 Date: June 11, 2015, 8:42 am
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Thanks for the info and pictures. I have been doing a bit of
surfing this morning and their were two brake levers by
Tomaselli in the states. There is also a bloke selling the
complete clutch and decompressor assembly NOS which he believes
is off a Ducatti but looks very like the one on my NF. On having
a look in Europe these a motor factor in Poland who is doing
copies except his have the finger grooves but with the ball
end. I have ordered a pair of the levers and as they are pretty
cheap they may not be fantastic bit I wont know till they
arrive.
The dynamo is off and the broken end bracket removed and with
the welder. The commutator is hardly worn and the brushes are as
new. The bearings look good too. How do you get the brush end
completely off? There is a screw on the body but if thats
removed I cant see how you would get the brush holder back in.
#Post#: 825--------------------------------------------------
Re: New member says hello
By: banquo Date: June 11, 2015, 2:32 pm
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No idea on the dynamo I'm afraid...
I had a look at my levers in the garage tonight, and they have
the ball ends and the finger grooves. They were on it when I got
it, and verty second hand, so i doubt if they're pattern parts.
Your levers seem to look the part.
#Post#: 826--------------------------------------------------
Re: New member says hello
By: cryospeed1 Date: June 11, 2015, 2:48 pm
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Hi when they arrive I will try and put a picture of them on here
with contact details.
#Post#: 827--------------------------------------------------
Re: New member says hello
By: Bruno Date: June 11, 2015, 2:56 pm
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I seem to remember years ago when Tommaselli levers were
available in loads of bike shops in the UK,that you could choose
between smooth or finger grooved ones.
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