im curious how rubber prebent hoses are made.

erik wrote:
im curious how rubber prebent hoses are made.

Me, too.

I guess the hose is vulcanized enough to cure
a thin layer of the outside, bent in a form,
then vulcanized completely.

http://www.youtube.com/watch?v=Ktvd_xtuW9c

--Winston

"Winston" wrote in message
...

http://www.youtube.com/watch?v=Ktvd_xtuW9c
--Winston

I've molded rubber parts from cut-up windshield washer tubing with heat and
pressure. I put a piece of 60/40 solder on the mold and heated it until the
solder melted, then squeezed the mold in the vise and let it cool.

jsw

On Feb 18, 11:18*am, erik wrote:
im curious how rubber prebent hoses are made.

They used to be made by extruding.The outside die plate could be moved
off centre which meant a thicker wall on one side of the tube.
The other side being thinner extruded at a faster speed and therefore
caused the hose to bend.A simple plc programm to control the die along
with a face knife and off you went.
That technology is over twenty years old so they may have moved on.

Jim Wilkins wrote:
wrote in message
...

http://www.youtube.com/watch?v=Ktvd_xtuW9c
--Winston

I've molded rubber parts from cut-up windshield washer tubing with heat and
pressure. I put a piece of 60/40 solder on the mold and heated it until the
solder melted, then squeezed the mold in the vise and let it cool.

That is intriguing!

Your mold was on the outside of the tubing?
How did you avoid kinking?
Multiple stranded wires stuffed in the I.D.?

--Winston the Curious

"Winston" wrote in message
...
Jim Wilkins wrote:

I've molded rubber parts from cut-up windshield washer tubing with heat
and
pressure. I put a piece of 60/40 solder on the mold and heated it until
the
solder melted, then squeezed the mold in the vise and let it cool.

That is intriguing!

Your mold was on the outside of the tubing?
How did you avoid kinking?
Multiple stranded wires stuffed in the I.D.?

--Winston the Curious

They were print head hammer pads for a Teletype ASR33, little buttons that
snap over a steel mushroom on the hammer. The ink solvent slowly turns them
to mush.

The mold cavity consisted of a flat-ended cylinder for the OD and striking
face, and a negative of the recess on the piston.

The head slid freely in and out of the cylinder so I could completely
disassemble it to remove the molded pad.

jsw

"Jim Wilkins" wrote in message
...
...
They were print head hammer pads for a Teletype ASR33, little buttons that
snap over a steel mushroom on the hammer. The ink solvent slowly turns
them to mush....
jsw

Here is a real one:
http://bytecollector.com/images/2008...letype_005.jpg
Mine lacked the rim and were harder to pry off.

The rubber didn't last as long as factory ones, partly because I re-inked
old ribbons with stamp pad ink, but since I could pop them out as needed, it
didn't have to.

jsw

Jim Wilkins wrote:
wrote in message
...
Jim Wilkins wrote:

I've molded rubber parts from cut-up windshield washer tubing with heat
and
pressure. I put a piece of 60/40 solder on the mold and heated it until
the
solder melted, then squeezed the mold in the vise and let it cool.

That is intriguing!

Your mold was on the outside of the tubing?
How did you avoid kinking?
Multiple stranded wires stuffed in the I.D.?

--Winston the Curious

They were print head hammer pads for a Teletype ASR33, little buttons that
snap over a steel mushroom on the hammer. The ink solvent slowly turns them
to mush.

The mold cavity consisted of a flat-ended cylinder for the OD and striking
face, and a negative of the recess on the piston.

The head slid freely in and out of the cylinder so I could completely
disassemble it to remove the molded pad.

OIC. Thanks!

--Winston

Jim Wilkins wrote:
"Jim wrote in message
...
...
They were print head hammer pads for a Teletype ASR33, little buttons that
snap over a steel mushroom on the hammer. The ink solvent slowly turns
them to mush....
jsw

Here is a real one:
http://bytecollector.com/images/2008...letype_005.jpg
Mine lacked the rim and were harder to pry off.

The rubber didn't last as long as factory ones, partly because I re-inked
old ribbons with stamp pad ink, but since I could pop them out as needed, it
didn't have to.

Thanks for the picture.
Interesting!

--Winston