KR> sanding joints?

[Russ Kendall]

Hi everyone, I've searched the archives on the topic of roughing up/preping 
joints prior to glueing with T-88. I recieved some input that this practice was 
not recommended. I used resin bond sandpaper to roughen the joints. 
   Any new feelings on this? I glued up a couple of test joints, and posted on 
my website.
http://home.bendbroadband.com/russkr2s


Russ

KR> sanding joints?

[Larry Flesner]

At 12:26 PM 3/27/2007, you wrote:
>Hi everyone, I've searched the archives on the topic of roughing 
>up/preping joints prior to glueing with T-88.
>Russ
+

I used FPL-16A epoxy for all my wood work.  I don't know if T-88 will absorb
in to the wood the same or not.  I cut all my gussets with a fine blade
on my radial arm saw.  I "fine tuned" them on a stationary disk sander
and glued them in place.   270 hours and no problems.

building tip:  To get the angles for the gussets I used two hacksaw blades.
Use an inch or two of each end with the holes.  Rivet them together and
tap the rivet flat with a hammer to a tension that will hold an angle but
still be movable.  I used one red and one black blade for identification.
Insert the blade into the gusset location so the two side are flush with
the wood.  You will have two angles to measure and set a disk sander.
Use the blades to transfer the angles to the disk sander.  You don't
care what the angles are, you just need to duplicate them.  Make sure
you place the gusset back in it's location when finished or otherwise
identify their location for later gluing .  Seldom will you have two gussets
with the same shape.

As always

Larry Flesner

KR> sanding joints?

[Nick Brennan]

This also brings up a question I'm havingI was a bit sloppy with the 
T-88 after gluing, and I'm wondering how y'all get rid of the excess glue 
once it has dried in place.  Should I sand it?  If so, what grit is best?

Nick Brennan
nickdbren...@comcast.net

- Original Message - 
From: "Russ Kendall" <rkend...@bendbroadband.com>
To: "KRnet" <kr...@mylist.net>
Sent: Tuesday, March 27, 2007 11:26 AM
Subject: KR> sanding joints?


> Hi everyone, I've searched the archives on the topic of roughing 
> up/preping joints prior to glueing with T-88. I recieved some input that 
> this practice was not recommended. I used resin bond sandpaper to roughen 
> the joints.
>   Any new feelings on this? I glued up a couple of test joints, and posted 
> on my website.
> http://home.bendbroadband.com/russkr2s
>
>
> Russ
> ___
> Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> Post photos, introductions, and For Sale items to 
> http://www.kr2forum.com/phpBB2/index.php
> please see other KRnet info at http://www.krnet.org/info.html 

KR> sanding joints?

[Myron (Dan) Freeman]

Hi Nick;

I've found that a Dremel tool with the proper shaped cutter tip works well 
if your carefull, then finsih off with a sanding block with 60 or 80 grit 
paper untill your satisfied.

Regards
Myron (Dan) Freeman
Indpls, Ind. 46203 USA. Home of the
2007 World Champion Indpls, Colt's
mfreem...@indy.rr.com
Posted - Tuesday, 03/27/07 2:50 pm 

KR> sanding joints?

[bob pearce]

Sanding jointsI have been building wooden
airplanes for over 40 years and using epoxy, including
T88 for the last 30 and since begining the epoxy I
have never sanded a joint. My joints are usually
planed now but for years used a planer blade in my
saw. Both with excellent results. I would suggest that
sanding, unless all the dust is removed actually
contaminates a joint. I might add that besides repairs
and restorations I have built 7 airplanes, 2 of which
were of my own design...bob pearce
--- Russ Kendall  wrote:

> Hi everyone, I've searched the archives on the topic
> of roughing up/preping joints prior to glueing with
> T-88. I recieved some input that this practice was
> not recommended. I used resin bond sandpaper to
> roughen the joints. 
>Any new feelings on this? I glued up a couple of
> test joints, and posted on my website.
> http://home.bendbroadband.com/russkr2s
> 
> 
> Russ
> ___
> Search the KRnet Archives at
> http://www.maddyhome.com/krsrch/index.jsp
> to UNsubscribe from KRnet, send a message to
> krnet-le...@mylist.net
> Post photos, introductions, and For Sale items to
> http://www.kr2forum.com/phpBB2/index.php
> please see other KRnet info at
> http://www.krnet.org/info.html
> 






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KR> sanding joints?

[VIRGIL N SALISBURY]

Sanding lets dust build up in the pores of the wood and 
lessens glue penetration, Virg

On Tue, 27 Mar 2007 10:26:51 -0800 "Russ Kendall"
 writes:
> Hi everyone, I've searched the archives on the topic of roughing 
> up/preping joints prior to glueing with T-88. I recieved some input 
> that this practice was not recommended. I used resin bond sandpaper 
> to roughen the joints. 
>Any new feelings on this? I glued up a couple of test joints, and 
> posted on my website.
> http://home.bendbroadband.com/russkr2s
> 
> 
> Russ
> ___
> Search the KRnet Archives at 
> http://www.maddyhome.com/krsrch/index.jsp
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> Post photos, introductions, and For Sale items to 
> http://www.kr2forum.com/phpBB2/index.php
> please see other KRnet info at http://www.krnet.org/info.html
> 
> 

KR> sanding joints?

[Ed Janssen]

Most of us seem to accept this as gospel, but it seems to me that what
little sanding "dust" is present, after brushing it off or vacuuming, should
easily be soaked up by the T-88 and the resultant mixture would then be
similar to a very light form of flox which is considered to be structural.
Doesn't seem that the dust would effectively plug up the pores of the wood
to the extent that the T-88 wouldn't eventually and successfully soak in to
the wood.  I can see where the accepted idea of roughing up the wood surface
with coarse sandpaper is a good move because it increases the surface area
for gluing.  Has anyone made up some test pieces to prove or disprove?

Ed Janssen




> Sanding lets dust build up in the pores of the wood and
> lessens glue penetration, Virg

KR> Sanding joints

[hart...@charter.net]

I don't think you will find technical data from glue manufacturers that 
recommends "roughing up" a surface to be glued.  A smooth freshly planed or 
sawn surface is best.  Roughing increases the thickness of the glue line and 
that is generally not a good idea.  Lightly scuffing plywood with sandpaper to 
remove manufacturing residue is the exception.  Epoxies tend to forgive us for 
small transgressions, but why not go with the adhesive manufacturer's 
recommendations?  I wouldn't worry about the sanding of end grain.  End grain 
joints don't have much structural integrity anyway.  Gussets and/or blocks 
secure those joints.
Rich Hartwig
Waunakee WI


>I can see where the accepted idea of roughing up the wood surface
> with coarse sandpaper is a good move because it increases the surface area
> for gluing. 

KR> sanding joints?

[Cláudio Holanda]

Dear Ed:

Roughing up the wood surface isn't a good practice. Coarse grain sandpaper 
will "fray" the wood fibers and will weaken your surfaces to be glued. The 
best is  obtain a surface as smooth as possible using fine grain sandpaper 
or a plane. Clean the surfaces by means of a piece of cloth  using thiner, 
absolute alcohol  or  nails varnish remover. After dry (only a few minutes), 
put the resin trying to do a good impregnation so as the resin can penetrate 
the surfaces. After that put some excess of resin and clamp.

Regards,
Cláudio Holanda
clau...@itaroca.com.br

--
- Original Message - 
From: "Ed Janssen" <ejans...@chipsnet.com>
To: "KRnet" <kr...@mylist.net>
Sent: Tuesday, March 27, 2007 11:50 PM
Subject: Re: KR> sanding joints?


> Most of us seem to accept this as gospel, but it seems to me that what
> little sanding "dust" is present, after brushing it off or vacuuming, 
> should
> easily be soaked up by the T-88 and the resultant mixture would then be
> similar to a very light form of flox which is considered to be structural.
> Doesn't seem that the dust would effectively plug up the pores of the wood
> to the extent that the T-88 wouldn't eventually and successfully soak in 
> to
> the wood.  I can see where the accepted idea of roughing up the wood 
> surface
> with coarse sandpaper is a good move because it increases the surface area
> for gluing.  Has anyone made up some test pieces to prove or disprove?
>
> Ed Janssen
>
>
>
>
>> Sanding lets dust build up in the pores of the wood and
>> lessens glue penetration, Virg
>
>
> ___
> Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> Post photos, introductions, and For Sale items to 
> http://www.kr2forum.com/phpBB2/index.php
> please see other KRnet info at http://www.krnet.org/info.html
>
>