holders of bearing holders?

From where can a home builder buy machined bearing holders?


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Good question. Twice I've sawed them off a damaged frame to use in my
new ones. But I'd like to get some as well.


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Here perhaps?

http://www.staffordmfg.com/


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goldenchicken II wrote:
*Here perhaps?

http://www.staffordmfg.com/ *

Or 'McMaster-Carr' (http://www.mcmaster.com/)

The shaft collar is the more common option for a DIY machined bearing
holder. George Barnes uses a machined shaft collar for his frames. DM
used a shaft collar for the Vortex frame. They're not ideal cause
they're a little heavy for what you need and some can be a bit thin
where the bolt head is countersunk meaning that there can be very little
metal supporting the area under the bolt head. Depends on the make of
the shaft collar.

Here's a thread that talks about 'bearing holders'
(http://tinyurl.com/3w6n3).

Steve Howard has also used shaft collars for his steel unicycles.
Here's one thread where he talks about his 'stainless steel muni
project' (http://tinyurl.com/d2paw). Steve's gallery has pictures of
the shaft collar being machined but the gallery is down right now so I
can't link you there. Steve's main gallery page is at
http://www.unicyclist.com/gallery/showard


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In the UK I use Farnell for some personal orders. As I can't read
Swedish I don't know if this option is available to you but here is a
link to a 40mm 2pc collar:

http://tinyurl.com/bkhcm

It seems very easy to buy shaft collars over the web in the US, and
other metal items, but very difficult in the UK.

Regards

Keith


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Thanks for all the good links. Through them I managed to find a dealer
even in my home town!

I wonder why people have found it necessary to bore out a lip preventing
the frame to slip radially on the bearing surface. These collars seem to
be made for industrial use - won't they clamp tight enough not to slip
without a lip?


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goldenchicken II wrote:
*I wonder why people have found it necessary to bore out a lip
preventing the frame to slip radially on the bearing surface. These
collars seem to be made for industrial use - won't they clamp tight
enough not to slip without a lip? *


You don't want to clamp it down too tight as that will make the bearings
move less freely and will also wear out the bearings quicker.


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I haven't measured the torque used however I tighten them with a ball
ended allen key (screwdriver style handle) and I doubt it is any higher
than with the standard pressed bearing holders.

Saying that I generally braze a small lip of steel on the outside of the
shaft collars, this is easier for me than getting undersized collars and
boaring out to leave a lip.

Keith


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Gilby wrote:
*You don't want to clamp it down too tight as that will make the
bearings move less freely and will also wear out the bearings quicker.
Though that's probably less of an issue with good machined bearing
holders. *


With an ID of 40 mm (equal as the bearing's OD) I believed the shaft
collars couldn't be tightened so much that they prevent the axle from
rotating freely ...


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keg wrote:
*I haven't measured the torque used however I tighten them with a ball
ended allen key (screwdriver style handle) and I doubt it is any
higher than with the standard pressed bearing holders.

Saying that I generally braze a small lip of steel on the outside of
the shaft collars, this is easier for me than getting undersized
collars and boaring out to leave a lip.

Keith *


The brazing solution did cross my mind but then I suppose you've got to
find a collar that is not too wide, just a fraction wider than the
bearings.

So you think it is enough having a lip only on one side (the outside)?

I saw that some collars have grooves on the inside. Find a ball bearing
with similar grooves on the outside and we could pip the lips ...


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