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Re: Rotrax build
Posted: Tue Sep 11, 2012 8:24 pm
by Clydesdale Scot
more googling provides this info
http://pardo.net/bike/pic/fail-024/000.html#harden" onclick="window.open(this.href);return false;
6.45mm flats. 5.6mm tall. 4.6mm diam. thread. 0.65mm pitch (approx). The original may have had a spacer between fitting hex and hub.
any help?
Re: Rotrax build
Posted: Wed Sep 12, 2012 9:57 am
by hiflange
Clydesdale Scot wrote:more googling provides this info
any help?
Can't believe I didn't see that one before - I mean it's the second result
Anyway 4.6mm equates to 3/16th, right? And 3/16th I have and they don't fit. Just ran the caliper over them again and they're 4.8mm, so 0.2mm larger diameter than pardo.net's measure, that doesn't seem enough to prevent the thread even starting. Pardo's approximate thread pitch measure is very fine. The only thread it matches is ME which doesn't seem right. There are so few threads and they're so small that taking a measurement with any sort of accuracy would require special tools. Microscope comes to mind.
I emailed Peter Underwood. He suggested the threads may be the same as bottom bracket oilers. I've tried a BB oiler in the hub and it does thread in a few turns, anyone know what spec BB oilers are?
Re: Rotrax build
Posted: Wed Sep 12, 2012 11:52 am
by WyvernRH
[quote="RobertFrith"
I emailed Peter Underwood. He suggested the threads may be the same as bottom bracket oilers. I've tried a BB oiler in the hub and it does thread in a few turns, anyone know what spec BB oilers are?[/quote]
Without checking I can't give you the specs but Bottom bracket oilers came in at least three different sizes. If he meant the 'normal' flip top type then I can tell now they don't fit as I have tried this
Most Tecalimit (sp?) types are also too big as well as they were normally meant for headsets.
However, in the end I did find a small Tecalimit nipple that fitted my rear Harden hub in my spares box (I think it came off an old wrecked hub of another make) but only one. The front hub has to make do with a blanking plug.
Have you tried pinching a grease nipple off an old Sturmey Hub?
Cheers
Richard
Re: Rotrax build
Posted: Thu Sep 13, 2012 12:35 am
by hiflange
WyvernRH wrote:Have you tried pinching a grease nipple off an old Sturmey Hub?
Thanks Richard, I hadn't but gave it a go just now. The SA nipple is too big.
Re: Rotrax build
Posted: Fri Sep 14, 2012 6:30 am
by maryusdemetry
Re: Rotrax build
Posted: Fri Sep 14, 2012 8:46 am
by Clydesdale Scot
maryusdemetry wrote:
Quited helpful, thanks
one for the
Foe list
Re: Rotrax build
Posted: Sat Sep 15, 2012 6:11 pm
by Clydesdale Scot
at the risk of being
if you have a grease nipple which is very, very close, is it possible to retap the thread on the hub to suit?
Re: Rotrax build
Posted: Wed Oct 31, 2012 12:37 am
by hiflange
Clydesdale Scot wrote:
if you have a grease nipple which is very, very close, is it possible to retap the thread on the hub to suit?
I suppose you could. I have two in complete wheels with missing nipples though so that'd mean dismantling the wheels. Wouldn't it??
Following communication with someone selling some bacon slicers (sans nipples) on a popular auction site I bought some 2BA nipples. They look identical to the one existing one I have and they fit and screw in a couple of turns but not all the way. They didn't come with the tiny fat washers that my original has though. I suppose with those they'd be pretty good. Only thing I've found that fits at all.
Oh yeah, the bacon slicers were in Perth too, I could have picked them up if I remembered to bid! The pair went for $135 I think, which considering they were in good nick seemed reasonable. Oh well...
Re: Rotrax build
Posted: Mon Nov 12, 2012 1:12 am
by hiflange
Re: Rotrax build
Posted: Tue Nov 13, 2012 2:34 am
by ghostpoet
Brilliant stuff!! Fantastic build. Those bars look all the better for the cloth tape...any plans for similar pics of the 5 Star?
Re: Rotrax build
Posted: Tue Nov 13, 2012 11:37 pm
by hiflange
ghostpoet wrote:Brilliant stuff!! Fantastic build. Those bars look all the better for the cloth tape...any plans for similar pics of the 5 Star?
Of course. I want to change the stem to a period one first. Then wrap the bars. Etc...
Re: Rotrax build
Posted: Wed Nov 28, 2012 8:11 pm
by Clydesdale Scot
Robert,
I stumbled across the 1950 Harden Catalogue and thought I would
post the link here in case anyone searching about Harden hubs stumbles onto this page.
many other period catalogues at that site
Re: Rotrax build
Posted: Sat Mar 16, 2013 1:27 am
by hiflange
This one had an outing on
Cycle Exif recently. I can't imagine that anyone here isn't already a fan of Adam's work, but you never know
check it out - best bike prawn site ever!