BB Chasing Tap

Does anyone know where I can find an inexpensive chasing tap for a
bottom bracket? I don't need to cut fresh treads, just clean-up
existing ones.

Thanks

Frank

monkeyboy wrote:
Does anyone know where I can find an inexpensive chasing tap for a
bottom bracket? I don't need to cut fresh treads, just clean-up
existing ones.

Thanks

Frank

Cyclus

--
---
Marten Gerritsen

INFOapestaartjeM-GINEERINGpuntNL
www.m-gineering.nl

Does anyone know where I can find an inexpensive chasing tap for a
bottom bracket? I don't need to cut fresh treads, just clean-up
existing ones.

Thanks

Frank

Frank: Even cleaning up existing threads requires a pretty nice tool to do
the job right. But if this is just an attempt to salvage a cheap frame, and
you can't bring it to a shop to have them clean the threads for you (which
would cost a lot less than a cheap chasing tap), you could try to make your
own. Just use an old bottom bracket, hacksaw some cuts across the threads
(not quite perpendicular) and give it a try.

--Mike-- Chain Reaction Bicycles
www.ChainReactionBicycles.com

monkeyboy wrote:
Does anyone know where I can find an inexpensive chasing tap for a
bottom bracket? I don't need to cut fresh treads, just clean-up
existing ones.

Thanks

Frank

biketoolsetc.com has some Hozan chasers:

http://tinyurl.com/dquxe

Not "cheap" but less expensive than others. Caution! Where it says RH
and LH on each one it doesn't mean "use on left hand side" or "use on
right hand side", it means "right handed threads, left handed threads"
(Gee, how do suppose I know that now...)

Joseph

Mike Jacoubowsky wrote:
Does anyone know where I can find an inexpensive chasing tap for a
bottom bracket? I don't need to cut fresh treads, just clean-up
existing ones.

Thanks

Frank


Frank: Even cleaning up existing threads requires a pretty nice tool to do
the job right. But if this is just an attempt to salvage a cheap frame, and
you can't bring it to a shop to have them clean the threads for you (which
would cost a lot less than a cheap chasing tap), you could try to make your
own. Just use an old bottom bracket, hacksaw some cuts across the threads
(not quite perpendicular) and give it a try.

Sounds like a neat idea, but aren't steel BB cups hardened? Or is the
hardening somehow localized to the bearing surfaces so that it doesn't
extend to the threaded part of the cup?

A carbide(?) rod saw would do it, but I think a hacksaw might not "cut it".

Mark

Looks like I'll have to take it to a shop. I couldn't believe the price
of a BB tap...jeeesss.

I did find a thread restoring tool in McMaster Carr that would be just
the ticket, but it would cost around $50 for the tool and die set.

It looks like who ever initially installed the BB didn't lube it at
all. I had to take it out with a hammer, and now the threads are packed
with aluminum from the old BB shell. I tried using a pick to dig it
out, but it's really packed in there.

Mark Janeba wrote:
Mike Jacoubowsky wrote:
Does anyone know where I can find an inexpensive chasing tap for a
bottom bracket? I don't need to cut fresh treads, just clean-up
existing ones.

Thanks

Frank


Frank: Even cleaning up existing threads requires a pretty nice tool to do
the job right. But if this is just an attempt to salvage a cheap frame, and
you can't bring it to a shop to have them clean the threads for you (which
would cost a lot less than a cheap chasing tap), you could try to make your
own. Just use an old bottom bracket, hacksaw some cuts across the threads
(not quite perpendicular) and give it a try.

Sounds like a neat idea, but aren't steel BB cups hardened? Or is the
hardening somehow localized to the bearing surfaces so that it doesn't
extend to the threaded part of the cup?

A carbide(?) rod saw would do it, but I think a hacksaw might not "cut it".

Mark

Hozan makes one and a complete LBS may have one
or a complete set of BB taps

M-gineering wrote:
monkeyboy wrote:
Does anyone know where I can find an inexpensive chasing tap for a
bottom bracket? I don't need to cut fresh treads, just clean-up
existing ones.

Thanks

Frank

Cyclus


Just another vote for the Cyclus. Nice home shop tool at a fair price.

Frank: Even cleaning up existing threads requires a pretty nice tool to
do the job right. But if this is just an attempt to salvage a cheap
frame, and you can't bring it to a shop to have them clean the threads
for you (which would cost a lot less than a cheap chasing tap), you could
try to make your own. Just use an old bottom bracket, hacksaw some cuts
across the threads (not quite perpendicular) and give it a try.

Sounds like a neat idea, but aren't steel BB cups hardened? Or is the
hardening somehow localized to the bearing surfaces so that it doesn't
extend to the threaded part of the cup?

A carbide(?) rod saw would do it, but I think a hacksaw might not "cut
it".

Mark

Inexpensive bottom brackets aren't anything to write home about; the threads
can be cut fairly easily. Perhaps not with a hacksaw though; I believe I've
done it with a file or dremel tool way, way, WAY back in the day. I
certainly didn't have a carbide rod saw at my disposal though!

--Mike Jacoubowsky
Chain Reaction Bicycles
www.ChainReaction.com
Redwood City & Los Altos, CA USA

"Mike Jacoubowsky" wrote: (clip)I certainly didn't have a carbide rod saw
at my disposal though
^^^^^^^^^^^^
The harder the threads are, the better the "fake" tap will work, provided
you can cut the slots. If you are talking about the kind of carbide rod saw
I am thinking of, I doubt it will work. Are you thinking of one of those
round hack-saw blades with carbide bits embedded along the length? Due to
the fact that it is round, it will make a "cove," rather than a
straight-sided slot, and the chances are it would not cut very well. An
abrasive disk in a Dremel would be your best bet.