Gooey perished rubber drive bands, revisited
 

This time a compact 1979 Aiwa L22, as always all the bands are perished,
that contagion again . I decided, this time, to liberally caster talcum
powder around the contaminated parts , my hands and goo pickers. Operating
at that stage , dry and dusty, avoided smearing on other parts, to remove
the bulk of the mess. Then meths on tissue paper and meths for general
smeared areas and some wool dunked in meths to run around the pulley edges
to clean out the gullies.
Anyone ever tried freezer spray?
My own cut silicone rubber bands will go back in there

Gooey perished rubber drive bands, revisited
 

Charlie+ wrote in message
...
On Sat, 29 Jun 2013 16:42:08 +0100, "N_Cook" wrote
as underneath my scribble :


My own cut silicone rubber bands will go back in there

Just querying what this refers to? Having recently been through a third
band replacement with my ancient Aiwa FX-90 (part of system rack) and
had to bodge with an undersize band from eBay as originals no longer
available! C+


Originals are of course as near to perished as the ones you're having to
replace.
I tend to use silicone rubber as much more available from "pound shops" /
kitchen supply shops etc rather than large minimum square metreage of
industrial neoprene rubber supply companies, techniques buried in the 3x
tips files off my site
http://www.divdev.fsnet.co.uk
The wide band for this Aiwa I will use a ring from one of those squash down
silicone rubber funnels ,
, just a shame about the lurid colours of the rubber
eg , http://img.hisupplier.com/var/userIm...1820013868.jpg
In the UK I get them from Matalan, gives 20 bands of a good range of lengths
and if 3mm wide then can be split for 40 bands. The slight set to the band
does not seem to matter for centalising the band on baluster pinions

Gooey perished rubber drive bands, revisited
 

Charlie+ wrote:

On Sat, 29 Jun 2013 16:42:08 +0100, "N_Cook" wrote
as underneath my scribble :

My own cut silicone rubber bands will go back in there

Just querying what this refers to? Having recently been through a third
band replacement with my ancient Aiwa FX-90 (part of system rack) and
had to bodge with an undersize band from eBay as originals no longer
available! C+


Places that repair hydraulics have a huge selection of o-rings in
round and square types.

Gooey perished rubber drive bands, revisited
 

Michael A. Terrell wrote in message
m...

Charlie+ wrote:

On Sat, 29 Jun 2013 16:42:08 +0100, "N_Cook" wrote
as underneath my scribble :

My own cut silicone rubber bands will go back in there

Just querying what this refers to? Having recently been through a third
band replacement with my ancient Aiwa FX-90 (part of system rack) and
had to bodge with an undersize band from eBay as originals no longer
available! C+


Places that repair hydraulics have a huge selection of o-rings in
round and square types.

2 troubles with that is its ok slicing a square into 4 say but only 2 of
them
would have a fair face on one side, to go against the drive pulley.
I've tried slicing circular O rings, physically worked but the rubber seems
to be too stiff ,whatever the technical term is , restitution?, lack of
stretch for a given cross section area

Gooey perished rubber drive bands, revisited
 

N_Cook wrote:

Michael A. Terrell wrote in message
m...

Charlie+ wrote:

On Sat, 29 Jun 2013 16:42:08 +0100, "N_Cook" wrote
as underneath my scribble :

My own cut silicone rubber bands will go back in there

Just querying what this refers to? Having recently been through a third
band replacement with my ancient Aiwa FX-90 (part of system rack) and
had to bodge with an undersize band from eBay as originals no longer
available! C+


Places that repair hydraulics have a huge selection of o-rings in
round and square types.

2 troubles with that is its ok slicing a square into 4 say but only 2 of
them
would have a fair face on one side, to go against the drive pulley.
I've tried slicing circular O rings, physically worked but the rubber seems
to be too stiff ,whatever the technical term is , restitution?, lack of
stretch for a given cross section area


You have to do everything the hard way. There are many different
compounds used to make the hydraulic seals, with no need to cut them.
They also stock rolls of round & square stock to make custom seals from.

Gooey perished rubber drive bands, revisited
 

Michael A. Terrell wrote in message
m...

N_Cook wrote:

Michael A. Terrell wrote in message
m...

Charlie+ wrote:

On Sat, 29 Jun 2013 16:42:08 +0100, "N_Cook"
wrote
as underneath my scribble :

My own cut silicone rubber bands will go back in there

Just querying what this refers to? Having recently been through a
third
band replacement with my ancient Aiwa FX-90 (part of system rack)
and
had to bodge with an undersize band from eBay as originals no longer
available! C+


Places that repair hydraulics have a huge selection of o-rings in
round and square types.

2 troubles with that is its ok slicing a square into 4 say but only 2 of
them
would have a fair face on one side, to go against the drive pulley.
I've tried slicing circular O rings, physically worked but the rubber
seems
to be too stiff ,whatever the technical term is , restitution?, lack of
stretch for a given cross section area


You have to do everything the hard way. There are many different
compounds used to make the hydraulic seals, with no need to cut them.
They also stock rolls of round & square stock to make custom seals from.

The main problem with keeping old mechanical kit going is the requirement
for wide bands for bulbous balluster pulleys, and I've never seen that
format used as neoprene seals , neccessity being the mother and all that

Gooey perished rubber drive bands, revisited
 

N_Cook wrote:

Michael A. Terrell wrote in message
m...

N_Cook wrote:

Michael A. Terrell wrote in message
m...

Charlie+ wrote:

On Sat, 29 Jun 2013 16:42:08 +0100, "N_Cook"
wrote
as underneath my scribble :

My own cut silicone rubber bands will go back in there

Just querying what this refers to? Having recently been through a
third
band replacement with my ancient Aiwa FX-90 (part of system rack)
and
had to bodge with an undersize band from eBay as originals no longer
available! C+


Places that repair hydraulics have a huge selection of o-rings in
round and square types.

2 troubles with that is its ok slicing a square into 4 say but only 2 of
them
would have a fair face on one side, to go against the drive pulley.
I've tried slicing circular O rings, physically worked but the rubber
seems
to be too stiff ,whatever the technical term is , restitution?, lack of
stretch for a given cross section area


You have to do everything the hard way. There are many different
compounds used to make the hydraulic seals, with no need to cut them.
They also stock rolls of round & square stock to make custom seals from.

The main problem with keeping old mechanical kit going is the requirement
for wide bands for bulbous balluster pulleys, and I've never seen that
format used as neoprene seals , neccessity being the mother and all that


I stated that "Different compounds are available". I never mentioned
neoprene.

...

Gooey perished rubber drive bands, revisited
 

On 01/07/2013 08:14, Charlie+ wrote:
On Sun, 30 Jun 2013 09:23:22 +0100, "N_Cook" wrote
as underneath :

http://www.divdev.fsnet.co.uk
Thanks for the pointer and for posting all that mass of useful
information...
C+



Thats the main flat band sorted, the rest are less critical.
Original unstretched 285mm x approx 3.5x1.5mm. Area for area, silicone
is more stretchy than neoprene , so about 50% allowance for that, a now
working band of unstretched 250mm x 4x 2mm. Target was 265mm x4x2
,probably turn out to be too tight on speed check and will have to
resort to cutting up my next size up solid silicone funnel as 250mm is
the max,outer ring, for those collapsible funnels