No broken teeth as such , just frayed/feathered tooth tips , in a very low
torque drive, reduction drive. And the feathering/bunching eventually causes
the gear train to stall.
It is attached, co-axial, to a fine pitch worm drive, with no salvaged
eqivalent around. I think I can turn the worm plus cog assembly around on
the axle and glue a salvaged 1mm pitch cog to the other end.

But just wondered if anyone has tried heating a revolving 1mm pitch brass
cog and remelting a nylon cog or any other technique ?


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

"N Cook" wrote in :

No broken teeth as such , just frayed/feathered tooth tips , in a very
low torque drive, reduction drive. And the feathering/bunching
eventually causes the gear train to stall.
It is attached, co-axial, to a fine pitch worm drive, with no salvaged
eqivalent around. I think I can turn the worm plus cog assembly around
on the axle and glue a salvaged 1mm pitch cog to the other end.

But just wondered if anyone has tried heating a revolving 1mm pitch
brass cog and remelting a nylon cog or any other technique ?

There is a plastic that melts at 62 C (130F). It becomes clear and you can
mold it by hand.
It sticks to other plastics.

When it cools down and sets, it looks and feels like nylon.

It is called 'Friendly Plastic' or 'Shape Lock'.

I used it to fix a split nylon gear in a printer.






--
bz 73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.

remove ch100-5 to avoid spam trap

N Cook wrote:

snip

But just wondered if anyone has tried heating a revolving 1mm pitch brass
cog and remelting a nylon cog or any other technique ?

Not exactly a solution to the problem you described, but here is my page
on (re)melting a nylon gear as part of a repair to a lift-chair screw drive:

http://www.cybertheque.org/homebrew/gear

Michael

On 3ÔÂ27ÈÕ, ÏÂÎç8ʱ54·Ö, "N Cook" wrote:
No broken teeth as such , just frayed/feathered tooth tips , in a very low
torque drive, reduction drive. And the feathering/bunching eventually causes
the gear train to stall.
It is attached, co-axial, to a fine pitch worm drive, with no salvaged
eqivalent around. I think I can turn the worm plus cog assembly around on
the axle and glue a salvaged 1mm pitch cog to the other end.

But just wondered if anyone has tried heating a revolving 1mm pitch brass
cog and remelting a nylon cog or any other technique ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list onhttp://home..graffiti.net/diverse:graffiti.net/



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msg wrote in message
...
N Cook wrote:

snip

But just wondered if anyone has tried heating a revolving 1mm pitch
brass
cog and remelting a nylon cog or any other technique ?

Not exactly a solution to the problem you described, but here is my page
on (re)melting a nylon gear as part of a repair to a lift-chair screw
drive:

http://www.cybertheque.org/homebrew/gear

Michael


For a stairlift I think I would have drilled and tapped the steel gear and
bolted the plastic one to it


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/