I have discovered that epoxy resin doesn't stick to nylon. That
doesn't seem to be a property of nylon that is well advertised, but
Google found a number of people complaining that they were unable to
glue nylon.

For my purposes this is ideal, since I want to cast some insulators
from epoxy resin, and I am able to make a mould out of solid nylon. I
used to tape up bits of plastic drainpipe for a mould but the epoxy
tended to leak through the joints, and the plastic would break when
taking the mould apart.

Here's an old insulator and the finished new insulator:
http://i50.tinypic.com/feqjyr.jpg

The old insulation is some horrible mixture of asbestos and something
else. I carefully cut it all off and cleaned up the brass insert that
I will reuse.

Here's the nylon mould which I turned up in a lathe.
http://i49.tinypic.com/20jfvr6.jpg

I cut the mould in half because I wasn't confident that the casting
would push out later. How right I was. I didn't make a very smooth job
in turning the mould and there are small grooves that the epoxy clings
to.
The white powder is filler that I used to add a bit of strength.

Here's the brass insert in one half of the mould:
http://i50.tinypic.com/oani2s.jpg
The white washers I made out of nylon and tapped them to suit the
brass thread. The epoxy will run through any little hole and I didn't
want it on the brass thread.

I put a couple of Jubilee clips around the mould and poured in the
resin. If you pour slowly on one side it pushes all the air out and
doesn't leave bubbles:
http://i47.tinypic.com/2l8uots.jpg

After a few hours the resin is set and I can open up the mould:
http://i47.tinypic.com/2hqdz5c.jpg

Be careful not to touch the sharp edge around the top. It's so sharp
that you can't feel it cutting your finger!

I put the casting in the lathe to trim off the end:
http://i46.tinypic.com/316w7id.jpg

I also skimmed along the sides since the mould was not perfectly round
after I had cut it in half.

I imagine that I can make a nylon mould for almost anything small. It
cuts and drills quite well.

In article
,
Matty F wrote:
I have discovered that epoxy resin doesn't stick to nylon. That
doesn't seem to be a property of nylon that is well advertised, but
Google found a number of people complaining that they were unable to
glue nylon.

It doesn't work with most flexible plastics.

--
*If love is blind, why is lingerie so popular? *

Dave Plowman London SW
To e-mail, change noise into sound.

In an earlier contribution to this discussion,
Matty F wrote:

I have discovered that epoxy resin doesn't stick to nylon. That
doesn't seem to be a property of nylon that is well advertised, but
Google found a number of people complaining that they were unable to
glue nylon.

For my purposes this is ideal, since I want to cast some insulators
from epoxy resin, and I am able to make a mould out of solid nylon. I
used to tape up bits of plastic drainpipe for a mould but the epoxy
tended to leak through the joints, and the plastic would break when
taking the mould apart.

Here's an old insulator and the finished new insulator:
http://i50.tinypic.com/feqjyr.jpg

The old insulation is some horrible mixture of asbestos and something
else. I carefully cut it all off and cleaned up the brass insert that
I will reuse.

Here's the nylon mould which I turned up in a lathe.
http://i49.tinypic.com/20jfvr6.jpg

I cut the mould in half because I wasn't confident that the casting
would push out later. How right I was. I didn't make a very smooth job
in turning the mould and there are small grooves that the epoxy clings
to.
The white powder is filler that I used to add a bit of strength.

Here's the brass insert in one half of the mould:
http://i50.tinypic.com/oani2s.jpg
The white washers I made out of nylon and tapped them to suit the
brass thread. The epoxy will run through any little hole and I didn't
want it on the brass thread.

I put a couple of Jubilee clips around the mould and poured in the
resin. If you pour slowly on one side it pushes all the air out and
doesn't leave bubbles:
http://i47.tinypic.com/2l8uots.jpg

After a few hours the resin is set and I can open up the mould:
http://i47.tinypic.com/2hqdz5c.jpg

Be careful not to touch the sharp edge around the top. It's so sharp
that you can't feel it cutting your finger!

I put the casting in the lathe to trim off the end:
http://i46.tinypic.com/316w7id.jpg

I also skimmed along the sides since the mould was not perfectly round
after I had cut it in half.

I imagine that I can make a nylon mould for almost anything small. It
cuts and drills quite well.


Very nice! Is this another tram project?
--
Cheers,
Roger
______
Email address maintained for newsgroup use only, and not regularly
monitored.. Messages sent to it may not be read for several weeks.
PLEASE REPLY TO NEWSGROUP!

Dave Plowman (News) wrote:
In article
,
Matty F wrote:
I have discovered that epoxy resin doesn't stick to nylon. That
doesn't seem to be a property of nylon that is well advertised, but
Google found a number of people complaining that they were unable to
glue nylon.

It doesn't work with most flexible plastics.

The word you want is 'polyolefins' the 'oily' polatics.

Polythene is the easiest one to strip it off.

I use polythene food boxes to mix it in.

On Nov 28, 12:25 am, "Roger Mills" wrote:
In an earlier contribution to this discussion,
Matty F wrote:

Here's an old insulator and the finished new insulator:
http://i50.tinypic.com/feqjyr.jpg

Very nice! Is this another tram project?

Yes. But it could be for trolley buses too!

On Nov 28, 12:39 am, The Natural Philosopher
wrote:
Dave Plowman (News) wrote:
In article
,
Matty F wrote:
I have discovered that epoxy resin doesn't stick to nylon. That
doesn't seem to be a property of nylon that is well advertised, but
Google found a number of people complaining that they were unable to
glue nylon.

It doesn't work with most flexible plastics.

The word you want is 'polyolefins' the 'oily' polatics.

Polythene is the easiest one to strip it off.

I use polythene food boxes to mix it in.

Can I get solid polythene or make a mould out of melted food boxes?

Matty F wrote:
On Nov 28, 12:39 am, The Natural Philosopher
wrote:
Dave Plowman (News) wrote:
In article
,
Matty F wrote:
I have discovered that epoxy resin doesn't stick to nylon. That
doesn't seem to be a property of nylon that is well advertised, but
Google found a number of people complaining that they were unable to
glue nylon.
It doesn't work with most flexible plastics.
The word you want is 'polyolefins' the 'oily' polatics.

Polythene is the easiest one to strip it off.

I use polythene food boxes to mix it in.

Can I get solid polythene or make a mould out of melted food boxes?

Probably.

On 27 Nov, 10:52, Matty F wrote:
I have discovered that epoxy resin doesn't stick to nylon. That
doesn't seem to be a property of nylon that is well advertised, but
Google found a number of people complaining that they were unable to
glue nylon.

For my purposes this is ideal, since I want to cast some insulators
from epoxy resin, and I am able to make a mould out of solid nylon. I
used to tape up bits of plastic drainpipe for a mould but the epoxy
tended to leak through the joints, and the plastic would break when
taking the mould apart.

Here's an old insulator and the finished new insulator:http://i50.tinypic.com/feqjyr.jpg

The old insulation is some horrible mixture of asbestos and something
else. I carefully cut it all off and cleaned up the brass insert that
I will reuse.

Here's the nylon mould which I turned up in a lathe.http://i49.tinypic.com/20jfvr6.jpg

I cut the mould in half because I wasn't confident that the casting
would push out later. How right I was. I didn't make a very smooth job
in turning the mould and there are small grooves that the epoxy clings
to.
The white powder is filler that I used to add a bit of strength.

Here's the brass insert in one half of the mould:http://i50.tinypic.com/oani2s.jpg
The white washers I made out of nylon and tapped them to suit the
brass thread. The epoxy will run through any little hole and I didn't
want it on the brass thread.

I put a couple of Jubilee clips around the mould and poured in the
resin. If you pour slowly on one side it pushes all the air out and
doesn't leave bubbles:http://i47.tinypic.com/2l8uots.jpg

After a few hours the resin is set and I can open up the mould:http://i47.tinypic.com/2hqdz5c.jpg

Be careful not to touch the sharp edge around the top. It's so sharp
that you can't feel it cutting your finger!

I put the casting in the lathe to trim off the end:http://i46.tinypic.com/316w7id.jpg

I also skimmed along the sides since the mould was not perfectly round
after I had cut it in half.

I imagine that I can make a nylon mould for almost anything small. It
cuts and drills quite well.

Your work, as ever is just incredible, thanks for sharing.

Usual to cast rigid items in flexible mould and vice versa.

Thought about silicone, 2 part mould making stuff is nice but
expensive, but have seen sculptors use tube upon tube of glazing
silicone to make a mould.

Really good book on casting:

http://www.amazon.co.uk/Prop-Builder...ref=pd_sim_b_3

Cheers
Adam

On Nov 28, 1:39 am, Adam Aglionby wrote:
On 27 Nov, 10:52, Matty F wrote:

I imagine that I can make a nylon mould for almost anything small. It
cuts and drills quite well.

Your work, as ever is just incredible, thanks for sharing.

Thanks. Usually someone comes up with some ideas I have not thought
of.

Usual to cast rigid items in flexible mould and vice versa.

Thought about silicone, 2 part mould making stuff is nice but
expensive, but have seen sculptors use tube upon tube of glazing
silicone to make a mould.

40 years ago I used to use Silastic 2 part rubber to make moulds, but
I don't know where to buy it now.
The advantage of nylon is that the mould is very accurate. And nylon
is all I've got lying around.

Really good book on casting:

http://www.amazon.co.uk/Prop-Builder...Handbook/dp/15...

Cheers
Adam

On Fri, 27 Nov 2009 05:10:42 -0800 (PST), Matty F
wrote:

40 years ago I used to use Silastic 2 part rubber to make moulds, but
I don't know where to buy it now.

South Western Industrial Plasters
01380 850616
They haven't yet joined the 21st century but are very nice people and
will send you an excellent catalogue if you phone them

Anna

On Fri, 27 Nov 2009 13:29:43 GMT, Anna Kettle wrote:

40 years ago I used to use Silastic 2 part rubber to make moulds,
but
I don't know where to buy it now.

South Western Industrial Plasters
01380 850616
They haven't yet joined the 21st century but are very nice people and
will send you an excellent catalogue if you phone them

To New Zealand? B-)

--
Cheers
Dave.

"Matty F" wrote in message
...
I have discovered that epoxy resin doesn't stick to nylon. That
doesn't seem to be a property of nylon that is well advertised, but
Google found a number of people complaining that they were unable to
glue nylon.

If you need to make lots you could make recyclable moulds out of wax,

On 27 Nov, 12:39, Adam Aglionby wrote:

Really good book on casting:
http://www.amazon.co.uk/Prop-Builder...Handbook/dp/15...

Hmmm... Borrowed that a while ago and found it outdated. Some of
that's the production quality of the book, but also the content looks
a bit antiquated.

Andy Wilson's "Making Stage Props" was much more fun. Not as specific
on casting, but a great read.

Bentley chemical company (silicones) are a delight to deal with and
very encouraging to small-scale prop makers.

Matty F wrote:
On Nov 28, 1:39 am, Adam Aglionby wrote:
On 27 Nov, 10:52, Matty F wrote:

I imagine that I can make a nylon mould for almost anything small. It
cuts and drills quite well.
Your work, as ever is just incredible, thanks for sharing.

Thanks. Usually someone comes up with some ideas I have not thought
of.

Usual to cast rigid items in flexible mould and vice versa.

Thought about silicone, 2 part mould making stuff is nice but
expensive, but have seen sculptors use tube upon tube of glazing
silicone to make a mould.

40 years ago I used to use Silastic 2 part rubber to make moulds, but
I don't know where to buy it now.

Do a google for your local industrial sealant shop and ask them for
some, or an equivalent. That is what I did in order to get some black
silicone adhesive that I couldn't find outside of the aerospace industry.

Dave

On 27 Nov, 14:45, Andy Dingley wrote:
On 27 Nov, 12:39, Adam Aglionby wrote:

Really good book on casting:
http://www.amazon.co.uk/Prop-Builder...Handbook/dp/15...

Hmmm... *Borrowed that a while ago and found it outdated. Some of
that's the production quality of the book, but also the content looks
a bit antiquated.

Read that criticism on Amazon as well TBH bit lost as to the meaning,
nothing much has changed in basic moulding and casting, some of the
moulding materials urethanes and epoxies have advanced but principles
are the same.

Can`t see where this `modern` content was going to come from...


Andy Wilson's "Making Stage Props" was much more fun. Not as specific
on casting, but a great read.

Great book but very light on casting detail.

Bentley chemical company (silicones) are a delight to deal with and
very encouraging to small-scale prop makers.

Glasplies do quite a silicones and casting resins, in depth in
silicone http://www.reptech.co.uk/ repeat fine enough detail to copy
cell walls..

For the OP, Dow Corning one of big names in silicones ,

http://yellow.co.nz/detailssearch.ds...101832832_1499

Cheers
Adam

On Fri, 27 Nov 2009 02:52:53 -0800, Matty F wrote:

I have discovered that epoxy resin doesn't stick to nylon.
...

Nice "report" - do keep 'em coming! :-)

cheers

Jules

On 27 Nov, 17:16, Adam Aglionby wrote:

Can`t see where this `modern` content was going to come from...

Obviously they weren't covering the web, and the vast amount of
information that's out there these days.

What I found lacking though was any detail on materials beyond the
broad types: particularly silicones, where Bentley were happy to
advise on a vast range of mixes with different mechanical behaviours.
The book seemed a bit of a closed book on this, as if you bought one
sort of goop, that was your lot and you ought to be grateful.

In message
,
Adam Aglionby writes

For the OP, Dow Corning one of big names in silicones ,

http://yellow.co.nz/detailssearch.ds...101832832_1499

Bigger than Jordan ?

--
geoff

On 27 Nov, 21:25, Andy Dingley wrote:
On 27 Nov, 17:16, Adam Aglionby wrote:

Can`t see where this `modern` content was going to come from...

Obviously they weren't covering the web, and the vast amount of
information that's out there these days.

Personally hate books with large amounts of links , they always end up
with things like geocities....


What I found lacking though was any detail on materials beyond the
broad types: particularly silicones, where Bentley were happy to
advise on a vast range of mixes with different mechanical behaviours.
The book seemed a bit of a closed book on this, as if you bought one
sort of goop, that was your lot and you ought to be grateful.

True, but there are whole websites on just silicones, but silicones
aren`t beginner friendly, expensive and expensive and easy to make
mistakes with. Ditto with urethanes, plus messy...
Advantage of PBMCHB is the basic techniques, plaster is cheap and
simple to use, gets a beginner encouraged to go further, also has one
of best explanations of vac forming in a book. Basic techniques of
taking a mould and casting an item are the same, materials may be
advancing but theyre used in pretty much the same way.

For the more advanced Amazon recommends

http://www.amazon.co.uk/Mouldmaking-..._bxgy_b_text_b

http://www.amazon.co.uk/Mouldmaking-..._bxgy_b_text_b

But if you had the machining skills of the O.P. and you didn`t in a
country where simply to posess such information would be illegal,
hence have to order it from Amazon U.S., project for the weekend ;-)

http://www.amazon.com/Expedient-Home...9373652&sr=8-4

Cheers
Adam

On 28 Nov, 00:31, geoff wrote:
In message
,
Adam Aglionby writes

For the OP, Dow Corning one of big names in silicones ,

http://yellow.co.nz/detailssearch.ds...101832832_1499

Bigger than Jordan ?

--
geoff

Never come across Jordan, just thought of DC as big player,presumably
with representation in NZ, other supplier thought of`s NZ distributor
is in Australia :-(

http://www.smooth-on.com

Cheers
Adam

In message
,
Adam Aglionby writes
On 28 Nov, 00:31, geoff wrote:
In message
,
Adam Aglionby writes

For the OP, Dow Corning one of big names in silicones ,

http://yellow.co.nz/detailssearch.ds...101832832_1499

Bigger than Jordan ?

--
geoff

Never come across Jordan,

I doubt you'd get the chance

just thought of DC as big player,presumably
with representation in NZ, other supplier thought of`s NZ distributor
is in Australia :-(

http://www.smooth-on.com

Cheers
Adam


--
geoff

In message
,
Matty F writes
40 years ago I used to use Silastic 2 part rubber to make moulds, but
I don't know where to buy it now.
The advantage of nylon is that the mould is very accurate. And nylon
is all I've got lying around.
Try finding your local Dow Corning rep, they own the name.

I got plenty of free samples of two part rubbers for a project I was
involved with and they indicated that they would be happy to supply
almost whatever quantity I wanted.

--
Clint Sharp

In message , geoff
writes
Never come across Jordan,

I doubt you'd get the chance
I doubt I'd want to, nasty piece of manipulative media whoring
personality free plastic that she is.

just thought of DC as big player,presumably
with representation in NZ, other supplier thought of`s NZ distributor
is in Australia :-(

http://www.smooth-on.com

Cheers
Adam



--
Clint Sharp

On 28 Nov, 02:27, geoff wrote:
In message
,
Adam Aglionby writes

On 28 Nov, 00:31, geoff wrote:
In message
,
Adam Aglionby writes

For the OP, Dow Corning one of big names in silicones ,

http://yellow.co.nz/detailssearch.ds...101832832_1499

Bigger than Jordan ?

--
geoff

Never come across Jordan,

I doubt you'd get the chance

just thought of DC as big player,presumably
with representation in NZ, other supplier thought of`s NZ distributor
is in Australia :-(

http://www.smooth-on.com

Cheers
Adam

--
geoff

Colour me whooshed! :-)

Doh!

Cheers
Adam

On Sat, 28 Nov 2009 09:32:20 +0000, Clint Sharp wrote:

In message , geoff
writes
Never come across Jordan,

I doubt you'd get the chance
I doubt I'd want to, nasty piece of manipulative media whoring
personality free plastic that she is.

Could maybe melt 'er down to make tram parts, though... :-)