Official Luthiers Forum!

Owned and operated by Lance Kragenbrink
It is currently Tue May 20, 2025 2:30 pm


All times are UTC - 5 hours





Post new topic Reply to topic  [ 10 posts ] 
Author Message
 Post subject:
PostPosted: Mon Feb 26, 2007 7:56 am 
Offline
Cocobolo
Cocobolo

Joined: Fri Jul 28, 2006 1:09 pm
Posts: 163
Location: Australia
After I took my sides off my form I have noticed a fair amount of rippling across the sides particularly just either side of the waists...

I couldn't get hold of any spring-steel (although next time I will use) so i used aluminium flashing...I figure maybe because the flashing doesn't offer any stiffness across the side being maybe one of the reasons..
Or maybe to much water....which the rosewood side was sprayed liberally then wrapped in alfoil..?

Does anyone have any ideas as to how to possibly get this out without sanding it flat as there would be 1-2mm difference in the peaks and valleys, so sanding would make the sides to thin i feel.....
and would the support strips on the side pull the sides out a little straighter when they are glued in?

thanks for any advice
Grant


Top
 Profile  
 
 Post subject:
PostPosted: Mon Feb 26, 2007 9:12 am 
Offline
Koa
Koa

Joined: Sun Feb 26, 2006 10:21 pm
Posts: 1055
Location: Australia
Grant,

The bending iron is sitting in the workshop waiting to be fired up. Just let me know when you're popping around


Top
 Profile  
 
 Post subject:
PostPosted: Mon Feb 26, 2007 9:48 am 
Offline
Koa
Koa
User avatar

Joined: Sun Jun 12, 2005 11:46 am
Posts: 720
Location: Australia

Hi Grant,
           I think too much water may be the culprit ,although some builders soak their sides in a tub for 1/4 hour or so and don't report rippling . I've just read The making of Claptons guitar . Wayne Henderson (the builder ) soaked his Braz. and is a believer in that method . On the other hand ,I understand Taylor bend their sides dry. I'm not really sure which is the better way to go . Others say oily woods don't need water (rosewoods ) whereas mahogany needs a little .Sorry this isn't much help. I hope others will chime in here and tell of what works for them.
It has always been an issue , whether to soak or spritz,,,,or go dry.

I have found it very difficult to remove the ripples . I've tryed the hot pipe afterwards , but didn't improve much . Leaving the sides a little thicker ,so you have got extra wood to sand flat is one solution . Puting it back in the bender for a dry cycle may help a little too.

Side braces don't help much either . Wish I could give you the magical solution mate . Maybe others can !!!

My sides on my latest ,(Myrtlewood) ,have no ripples at all!
Mahogany is known for the ripple affect.
I wrapped my Myrtle sides in foil , which maybe the answer .Traps the moisture in there a little longer while the heat gets up to bending temperature.

Cheers, Craig


        Lawrence of Australia

_________________
CRAIG LAWRENCE of AUSTRALIA
_____________________________________________


Top
 Profile  
 
 Post subject:
PostPosted: Mon Feb 26, 2007 10:49 am 
Offline
Brazilian Rosewood
Brazilian Rosewood
User avatar

Joined: Sat Feb 12, 2005 1:07 am
Posts: 2281
Location: Jones, OK
Grant, I have a set of macassar ebony sides on my bench right now that did the same thing. I bent them in the Fox bender and they came out wavy across the side and also had some faceting on the upper bout area.

I tried getting them straightened out on a hot pipe and managed to remove nearly all of the faceting but the ripples seem to be there for good. Oh yeah, I also tried making an inside caul that fit my mold and clamped them in the mold with the caul and a heat blanket. That didn't remove the ripples either.

I called Uncle Bob (aka Zootman Bob) this morning and purchased another set of sides. Hope you have better luck than I did.....

_________________
Dave Rector
Rector Guitars


Top
 Profile  
 
 Post subject:
PostPosted: Mon Feb 26, 2007 12:38 pm 
Offline
Koa
Koa
User avatar

Joined: Mon Oct 23, 2006 1:46 am
Posts: 588
Location: Is this heaven? "No, it's Iowa."
[QUOTE=gratay] would the support strips on the side pull the sides out a
little straighter when they are glued in?
[/QUOTE]

Grant, I've straighten out sides by beefing-up the strips. What I've done
is, clamp various thicknesses of brace material across the sides to find
out how small the brace can be and still be able to hold the side flat. A
piece of spruce 1/4" by 1/4" should bend the side quite a bit. If you do
this, I'd recommend puting them all the way across the side, and then
taper the ends so they are just as wide as the lining.

Long

_________________
"No man ever steps in the same river twice, for it's not the same river and he's not the same man.” -Heraclitus of Ephesus


Top
 Profile  
 
 Post subject:
PostPosted: Mon Feb 26, 2007 1:14 pm 
Offline
Cocobolo
Cocobolo

Joined: Thu Nov 16, 2006 9:19 am
Posts: 163
I had a solid inside 1/2 mold. I used an old clothes iron that was heated on a stove and I pressed the side against the mold. Don't get the iron too hot, or you'll char the wood. If you do not have such a mold, it is probably not worth making one to salvage the sides.


Top
 Profile  
 
 Post subject:
PostPosted: Mon Feb 26, 2007 3:25 pm 
Offline
Koa
Koa
User avatar

Joined: Fri Jan 13, 2006 5:35 pm
Posts: 1021
Location: United States
Grant,
Very early on, I discovered the advantage with bending with thinner sides.
I had a very bad experience with Malaysian Blackwood. The sides were
not thick enough to make them level - the "waves" were that bad.

I have since bent a number of very difficult woods (ebonies, etc...) and
always have my sides turn out perfect.

I thin my sides down to 0.070" or slightly above. Since they bend so well
at this thickness, you don't remove extra wood trying to make them level.

--
Simon


Top
 Profile  
 
 Post subject:
PostPosted: Tue Feb 27, 2007 1:33 am 
Offline
Contributing Member
Contributing Member
User avatar

Joined: Fri Sep 09, 2005 7:51 am
Posts: 3786
Location: Canada
I have added extra cross bars to most of my forms right around the waist area, and this seems to help a lot. I did have one set of quilted sapele go cupped either side of the waist, and a couple 1/4 by 3/8 triangulated spanish cedar side braces fixed that but good !!! The extra weight is really nothing from these.

_________________
Tony Karol
www.karol-guitars.com
"let my passion .. fulfill yours"


Top
 Profile  
 
 Post subject:
PostPosted: Tue Feb 27, 2007 8:36 pm 
Offline
Cocobolo
Cocobolo

Joined: Fri Jul 28, 2006 1:09 pm
Posts: 163
Location: Australia
thanks guys for your experiences....

Craig.....I was thinking a dry cycle could be worth a shot as well. and they were wrapped in foil also....could be to much water issue.?

Bob....beefing up the strips sounds like the go and the length of the sides sounds like a good idea to me.

simon ....the first side was around .090 which was hard to bend and i thought the to thick factor may be the reason..But the second side i went down to .080 which was easier to bend but had the same result...which makes me think to much moisture.?

tony.....my bending form is solid ...but thats the spot.either side of the waist...and spanish cedar is a good tip for the weight factor of the beefy strips..

cheers guys


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 52 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB® Forum Software © phpBB Group
phpBB customization services by 2by2host.com