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[casting] Digest Number 3420

Messages In This Digest (9 Messages)

Messages

1a.

Re: cutting and re-attaching delrin.

Posted by: "John Hagen" sprinthag@yahoo.com   sprinthag

Wed Mar 5, 2008 9:55 am (PST)

--- In casting@yahoogroups.com, Khris <kandc.au@...> wrote:
>
> I thought that Loktite had a product that could glue delrin.
>
> Khris
>
>
I typed in Delrin on the Loctite site seach and received no results.

The stuff is a effect a solid lubricant. Its almost like trying to glue
grease.

John Hagen
Milwaukee, WI

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Messages in this topic (9)
1b.

Re: cutting and re-attaching delrin.

Posted by: "Alan C Welch" acwelch@interlog.com   acwelchca

Wed Mar 5, 2008 10:26 am (PST)

Loctite has a surface activator that is supposed to make it possible to glue materials like Delrin using CA. I have tried it and it works to a degree; that is to say I have used it in an application that did not put a huge amount of stress on the joint. I don't know just how strong the joints are compared to the strength that would be achieved using more common plastics.

There is also a CA like glue called Cyanopoxy, I believe. The individual who is the main source of this material says it's great. I have no first-hand knowledge, however.

Al

----- Original Message -----
From: John Hagen
To: casting@yahoogroups.com
Sent: Wednesday, March 05, 2008 12:55 PM
Subject: [casting] Re: cutting and re-attaching delrin.

--- In casting@yahoogroups.com, Khris <kandc.au@...> wrote:
>
> I thought that Loktite had a product that could glue delrin.
>
> Khris
>
>
I typed in Delrin on the Loctite site seach and received no results.

The stuff is a effect a solid lubricant. Its almost like trying to glue
grease.

John Hagen
Milwaukee, WI

[Non-text portions of this message have been removed]

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Messages in this topic (9)
1c.

Re: cutting and re-attaching delrin.

Posted by: "oneacmename" daniel@gecko-grotto.com   oneacmename

Wed Mar 5, 2008 2:11 pm (PST)

I have never tried this stuff but they say it can weld Delrin
requires heat and I'm actually curious if it works so if you try it
reply with your results :)

http://www.solder-it.com/solderpaste.asp#Plastic%20Weld

Daniel

--- In casting@yahoogroups.com, "John Hagen" <sprinthag@...> wrote:

> I typed in Delrin on the Loctite site seach and received no results.
>
> The stuff is a effect a solid lubricant. Its almost like trying to
glue
> grease.
>
> John Hagen
> Milwaukee, WI
>

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Messages in this topic (9)
1d.

Re: cutting and re-attaching delrin.

Posted by: "Mike Bauers" mwbauers55@wi.rr.com   mwbauers

Wed Mar 5, 2008 2:40 pm (PST)

You folks know about Cypox ???

http://www.gowest2.com/c-pox/faq.html

"Does C-pox™ work on "slippery" plastic?
Yes. This system has been developed for use on all types of
plastics. It is the only viable solution (besides a plastic welder)
for use on materials such as UHMW, Delrin®, Polypropylene,
Polyethylene, Nylon, Teflon®, ABS. You will find these high density
plastics in the form of children's toys, car dashboards and bumpers,
appliances, tools, electronics, etc. Success with bonding these
plastics is achieved with using our Plastic Primer 302 to prepare the
surface before applying the Bonder and Activator."

http://www.mrhobby.com/Cyantips.html

" III. The Main Attraction--Integrating "Slippery" PlasticsI've
gotten most folks' attention when I tell them I have something that
will work on Delrin and most other slippery or "engineering"
plastics. For my first test, I took a piece of Delrin sprue from a
set of Atlas handrail stanchions. Using the brush-on CoolChem Poly
Treatment 311 , I prepared the Delrin, and while I let it work for a
minute, I applied the Cool Chem Integrator 75 (Cyanopoxy) to a piece
of brass sprue from a Precision Scale speed recorder. I then pressed
the Delrin into the brass, and then gently misted it with the spray
CoolChem Activator 310 to create the reaction. The part was well
bonded in seconds. Most importantly, when I tried the next day, I
couldn't even dislodge the sprue with pliers! It's as if the two
materials are now one, hence the term "integration".
Emboldened, I tried an experiment where I cut another piece of sprue,
and tried bonding it end to end. I prepped each end, applied a dot
of Cool Chem Integrator 75 (Cyanopoxy) to one end, misted the other
end, and pressed them together. This time I did not get a bond, and
was a bit puzzled, so I went back to the instructions, looking for a
flaw in technique.

Trying again, with another piece, I again prepped both ends with the
brush-on CoolChem Poly Treatment 311 material. After waiting for
about a minute, I then applied a dot of Cool Chem Integrator 75
(Cyanopoxy) to one end, pressed the ends together, noticed a little
fillet of the integrator ooze out, then hit it with the spray
CoolChem Activator 310. I held the ends tightly together for several
seconds, then left it alone. The bond seemed to hold.

Checking it the next morning, I found that the bond had amazing
tensile strength. There was literally no way to pull the joint
apart. However, with some doing, by using leverage and using the
bond itself as a fulcrum, I did manage to eventually snap the joint.
Would I call this a failure? Not at all. In practice, when dealing
with slippery plastics, nothing will touch them! I tried
conventional plastic cement on the sprue, and it basically beaded up
and rolled off. With Cool Chem Integrator 75 (Cyanopoxy) , you will
be able to mend plastic handrails, and they will actually hold unless
subjected to duress, for example, or make modifications to Delrin
truck sideframes. The uses are endless, limited by your imagination
only. "

Best to ya'
Mike Bauers
Milwaukee Wi, USA

On Mar 5, 2008, at 11:55 AM, John Hagen wrote:

> --- In casting@yahoogroups.com, Khris <kandc.au@...> wrote:
>>
>> I thought that Loktite had a product that could glue delrin.
>>
>> Khris
>>
>>
> I typed in Delrin on the Loctite site seach and received no results.
>
> The stuff is a effect a solid lubricant. Its almost like trying to
> glue
> grease.

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Messages in this topic (9)
2a.

Re: R: [casting] cutting and re-attaching delrin.

Posted by: "Spanosnu@aol.com" Spanosnu@aol.com   spano_snu

Wed Mar 5, 2008 9:56 am (PST)

There are some CAs that claim to be able to bond Delrin to Delrin, but they
are quite expensive.


"Fusion" is one of them. Mike's Model-n'Crafter's Glue is another
one:www.ricketyrails.com is another one that claims to bond Delrin. I have not tested
it yet.

Rick Spano
web site: scenicedandundecided.net

**************It's Tax Time! Get tips, forms, and advice on AOL Money &
Finance. (http://money.aol.com/tax?NCID=aolprf00030000000001)

[Non-text portions of this message have been removed]

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Messages in this topic (5)
2b.

Re: R: [casting] cutting and re-attaching delrin.

Posted by: "Khris" kandc.au@gmail.com   kandc_au

Wed Mar 5, 2008 4:00 pm (PST)

Rick,
That may very well have been what I was thinking of. (Aging has it's
limitations :-D )

Khris

Spanosnu@aol.com wrote:
>
> There are some CAs that claim to be able to bond Delrin to Delrin, but
> they
> are quite expensive.
>
>
> "Fusion" is one of them. Mike's Model-n'Crafter's Glue is another
> one:www.ricketyrails.com is another one that claims to bond Delrin. I
> have not tested
> it yet.
>
> Rick Spano
> web site: scenicedandundecided.net
>

[Non-text portions of this message have been removed]

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Messages in this topic (5)
2c.

Re: R: [casting] cutting and re-attaching delrin.

Posted by: "Spanosnu@aol.com" Spanosnu@aol.com   spano_snu

Wed Mar 5, 2008 11:09 pm (PST)


In a message dated 3/5/2008 7:00:58 P.M. Eastern Standard Time,
kandc.au@gmail.com writes:

Rick,
That may very well have been what I was thinking of. (Aging has it's
limitations :-D )

Khris

Kris,

You noticed that I used the symbols CA instead of Cyano-Acrilate, because at
my age I am not sure it is spelled correctly. I should test it since I have
a bottle bought specifically for that purpose years ago. Has not been
opened yet. I never Procrastinate! He! He!

If there is not a lot of stress on the joint, Pliobond or Dap contact
cement works. Roughen up the two Delrin surfaces before applying the contact
cement. I have welded Delrin with a fine cone tip and flat tip soldering iron.
The fumes can be nasty, if the tip has gotten too hot. It does not leave a
pretty bond and since it is only possible tow weld the outside surface of the
bond, the bond is also not very strong.

Rick

**************It's Tax Time! Get tips, forms, and advice on AOL Money &
Finance. (http://money.aol.com/tax?NCID=aolprf00030000000001)

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Messages in this topic (5)
3a.

R: Re: [casting] Quick Question About Vulcanizing Delrin

Posted by: "John Bear Ross" hellionproductions@earthlink.net   hellionproductions

Wed Mar 5, 2008 1:13 pm (PST)

Gents, thank you both for your answers. They both help.

Best,
John Bear Ross
www.johnbearross.com

--- In casting@yahoogroups.com, Marco Campagna <geicca@...> wrote:
>
> I do not agree with Mark,
> There are low temperature vulcanized rubbers
> that are ok with Derlin, they just need 60-70°C for vulcanization.
This
> is a lot under the Derlin melting point.
>
> Another good material for
> tooling can be ureol.
> Hope it helps
>
>
> ----Messaggio originale----
> Da:
> ap40rocktruck@...
> Data: 5-mar-2008 3.36 PM
> A:
> <casting@yahoogroups.com>
> Ogg: Re: [casting] Quick Question About
> Vulcanizing Delrin
>
> No, nor should this be attemted. Delrin has a low
> melt point of 275-280F over 395F delirin gives off formelahyde
gas,
> which is highly toxic & dangeruse.
>
> Regards,
> RC Mark
>
> John Bear
> Ross <hellionproductions@...> wrote:
> Hello, all.
>
> Is Delrin (Acetal) able to survive vulcanization? Thanks in advance.
>
> Best,
> John Bear Ross
> www.johnbearross.com
>
>
>
>
>
>
> ---------------------------------
> Be a better friend,
> newshound, and know-it-all with Yahoo! Mobile. Try it now.
>
> [Non-text
> portions of this message have been removed]
>
>
>
>
> Yahoo! Groups Links
>
>
>
> (Yahoo! ID required)
>
>
> mailto:casting-fullfeatured@yahoogroups.com
>

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Messages in this topic (2)
4.

Pecan Resin & Vaccume Extraction

Posted by: "rebendever" yahoo.groups.for@debenllc.com   rebendever

Thu Mar 6, 2008 8:03 am (PST)

I was watching a "How it's Made" segment on TV and they were casting
12" highly detailed figurines in a pecan shell and resin mix and to
extract the figurine from the RTV mold they placed the mold with the
resin set up on top of a tall tube and vaccumed the air to cause the
mold to expand and easily extract the figurine from them mold.
Question 1: We do we get the pecan resin from?
Question 2: Is the vaccume/expanding mold that easy to do or is this
a special case? Have folks on this list done this sort of extraction?
Are there Do's & Don'ts?

Many thanks,
============== DEBEN LLC ================ Richard E. Bendever DEBEN
LLC, 910 Millvale Place, P. O. Box 465898, Lawrenceville, GA 30042-
5898

www.DEBENLLC.com | — Home for 1:64 Modeling Guide | Doctor Ben's
Scale Consortium | Fine Scale Miniatures Biz | Main Street Motor
Co | Smoky Mountain Model Building

=======================================
*NEW* Order Line: 770.985.2896 /FAX Line: 770.979.5069


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