generator hub search

B.B. said:

If I'm going to purchase a used generator hub what's an effective way
to check it out before building it into a wheel?

Hmmm. I've checked out one that was built into a wheel. I chucked a
rubber sanding drum into a drill press, set it for the proper rpm to
simulate a 15 mph road speed, and ran the tire on the drum. This
allowed me to put a meter on the hub, try different bulbs, etc.

I suppose you could do the same, running the rubber drum on the outside
edge of the hub. You'd need a lower speed, of course.

Quoted message said:

And what's the actual likelyhood of finding one in a shop in texas?

A used one? As a wild guess: roughly 0.00001 % chance.

--
--------------------+
Frank Krygowski [To reply, remove rodent and vegetable dot com,
replace with cc.ysu dot edu]

B.B. said:

If I'm going to purchase a used generator hub what's an effective way
to check it out before building it into a wheel?
And what's the actual likelyhood of finding one in a shop in texas?

As a hint at the second one, I recall a dealer at a swap meet in Maryland
who had a bunch of generator hubs. They were Shimano I believe, not as
good a rep as the Schmidt. I didn't get one, even at the $50 he was
hawking them at, since they seemed quite rough, turning the axle with my
fingers.

I'd bet someone has a stock of these Shimano hubs in Texas, unless this
dealer in Maryland cornered the market. But, I don't know if that would
be what you wanted. Caveat emptor.

--

David L. Johnson

__o | Enron's slogan: Respect, Communication, Integrity, and
_`\(,_ | Excellence.
(_)/ (_) |

B.B. said:

If I'm going to purchase a used generator hub what's an effective way
to check it out before building it into a wheel?
And what's the actual likelyhood of finding one in a shop in texas?

--
B.B. --I am not a goat! thegoat4 at airmail.net

If it's an Sturmey Archer: beware as disassembly without a keeper kills
the magnet.
Other dynamo's: check the stator for electrical resistance. Mount the
dynamo in a fork and give it a quick spin. If you short-circuit the
terminals with a screwdriver you should see sparks.
To the uninitiated bearings will feel very rough, as bearing friction is
masked by the magnets. There shouldn't be any play though.

--
---
Marten Gerritsen

INFOapestaartjeM-GINEERINGpuntNL
www.m-gineering.nl

David L. Johnson said:

B.B. said:

If I'm going to purchase a used generator hub what's an effective way
to check it out before building it into a wheel?
And what's the actual likelyhood of finding one in a shop in texas?

As a hint at the second one, I recall a dealer at a swap meet in Maryland
who had a bunch of generator hubs. They were Shimano I believe, not as
good a rep as the Schmidt. I didn't get one, even at the $50 he was
hawking them at, since they seemed quite rough, turning the axle with my
fingers.

All generator hubs feel like that, it's the generator part that does it.

The Nexus generator hubs are wonderful, I've got two of them and also a
Schmidt. Nexus is a much better value though.

http://sheldonbrown.com/harris/lighting/shimano.html

Sheldon "Batteries Not Included" Brown
+---------------------------------------------------------+
| Our country is the world - our countrymen are mankind |
| --William Lloyd Garrison |
+---------------------------------------------------------+
Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
http://harriscyclery.com
Hard-to-find parts shipped Worldwide
http://captainbike.com http://sheldonbrown.com

Sheldon Brown said:

Quoted message said:

hawking them at, since they seemed quite rough, turning the axle
with my fingers.

All generator hubs feel like that, it's the generator part that
does it.

The poles don't feel rough IMHO. They make it hard to feel the
actual bearings, but their magnetic resistance is as smooth as
possible...

--
MfG/Best regards
helmut springer