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  #256  
Old 04-10-2016, 07:02 AM
littlesmith littlesmith is offline
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Quote:
Originally Posted by LouieAtienza View Post
Michael Doolin made guitars with bent top arm rests. I don't remember any complaints about the sound or workmanship of his guitars!
Thank you, i looked it up, it looks very nice :

http://www.doolinguitars.com/articles/armbevel/

He is doing it with a silicone heating blanket, which is a far better method then mine, but more expensive.
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  #257  
Old 04-10-2016, 07:07 AM
littlesmith littlesmith is offline
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Doesnt quite get hot enough, pictures of modifications will follow... Turns out i cant live with these screws sticking out, haha. I wanna get the half round head screws. You can see i`m not a metal worker, the corners do not line up, the sheet should have been bigger or the box smaller. I did not realise it would not reach the corner when bent, just cosmetic, no big deal.

If anybody is planning on making this, i would recommend doing it like this :

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Last edited by littlesmith; 04-10-2016 at 07:13 AM.
  #258  
Old 04-10-2016, 08:51 AM
printer2 printer2 is offline
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Quote:
Originally Posted by littlesmith View Post
Thank you, i looked it up, it looks very nice :

http://www.doolinguitars.com/articles/armbevel/

He is doing it with a silicone heating blanket, which is a far better method then mine, but more expensive.
Looks like his bevel uses a smaller portion of the top.



Like the look of it.
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  #259  
Old 04-10-2016, 10:19 AM
LouieAtienza LouieAtienza is offline
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Quote:
Originally Posted by littlesmith View Post




Doesnt quite get hot enough, pictures of modifications will follow... Turns out i cant live with these screws sticking out, haha. I wanna get the half round head screws. You can see i`m not a metal worker, the corners do not line up, the sheet should have been bigger or the box smaller. I did not realise it would not reach the corner when bent, just cosmetic, no big deal.

If anybody is planning on making this, i would recommend doing it like this :

Go to the hardware store and buy a cheap countersink bit. Then you can get the screws to sit almost perfectly flush with the metal surface!
  #260  
Old 04-14-2016, 09:36 AM
littlesmith littlesmith is offline
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Enough layers of varnish (fully cured after 72 hours per layer...











This raised area will actually be a lower spot in the negative mold, you have to reverse everything in your head. The rounded edge of this level will be the exact place of the resin infusion MTI hose. This hose goes around the perimiter of the guitar body and all resin wants to go there, the resin will be introduced in the middle.



The purple is the resin entry channel, the red is the MTI resin infusion hose, the green is a double seal flange for the reusable vacuumbag. The air and epoxy wants to go from the purple to the red, saturating all fabric on the way there.
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Last edited by littlesmith; 04-14-2016 at 09:45 AM.
  #261  
Old 04-15-2016, 10:23 AM
littlesmith littlesmith is offline
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Finished the soundboard arm bevel bending box.







The sheet is cut in 2 pieces so the heat is not being dissapated by the large surface area.

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  #262  
Old 04-16-2016, 05:41 AM
Aubade Acoustics Aubade Acoustics is offline
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Looks like you are having fun. I am anxious to see how you plan to get the top to fit inside the carbon body snug around the edges, especially where the top dips down on the side. Seems like a real challenge. Keep in mind if you use an exact template of the body to cut the top it might end up being short where the bevel goes down from the bend.
  #263  
Old 04-16-2016, 08:49 AM
littlesmith littlesmith is offline
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Quote:
Originally Posted by Aubade Acoustics View Post
Looks like you are having fun. I am anxious to see how you plan to get the top to fit inside the carbon body snug around the edges, especially where the top dips down on the side. Seems like a real challenge. Keep in mind if you use an exact template of the body to cut the top it might end up being short where the bevel goes down from the bend.
Hi.

I think i will bend it before rough cutting the shape on the bandsaw. Or leave some extra on that area and then fit it to a body. Maybe a plexiglass bent template (that fits in all the bodies) could work. The edge of that area will be around 2 centimeter lower the soundboard level in a gradual slope. I guess that would make the soundboard around 3 millimter too short if you would cut it from a flat template...

I have now glued 7 soundboard and they all have 1 coat of protective clearcoat, but i haven`t cut anything out yet, i am still to scared to do that before i have made some composite bodies, it would be a disaster if it`s too small...
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Last edited by littlesmith; 04-16-2016 at 09:25 AM.
  #264  
Old 04-17-2016, 10:18 AM
littlesmith littlesmith is offline
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Bent soundboard resting in the jig (1 cm oversized cutout) :



Here is a wacky movie of bending the acoustic guitar armbevel :

https://www.youtube.com/watch?v=HqDl...ature=youtu.be

The glue joint actually opened up from the heat about 3 centimeters long. I put titebond in and binding tape and put it back in the jig to rest.
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Last edited by littlesmith; 04-19-2016 at 04:45 PM.
  #265  
Old 04-18-2016, 08:13 AM
littlesmith littlesmith is offline
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Supplies for the carbon fiber armbevel reinforcement.



Baking sheet with high temp release wax coating.



Epoxy the bevel area.



1 layer of carbon fiber and epoxy (resin rich, the excess will be squeezed out).



Back into the jig to cure the epoxy in the desired shape.

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  #266  
Old 04-18-2016, 10:56 AM
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This is a cool thread.

We are "watching."

Continued good luck!

Chris
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  #267  
Old 04-19-2016, 03:47 AM
littlesmith littlesmith is offline
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Came out nice and flat (some pinholes because this was not under vacuum).



This bend is now permanently held in shape by the carbon fiber.



post curing in an air oven.



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  #268  
Old 04-21-2016, 07:09 AM
littlesmith littlesmith is offline
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Routing the channels for the reusable vacuumbag. Very difficult routing operation, the foot of the router follows the round pieces and then you have to switch to the other side to follow the straight line. You are switching 4x per pass. I slipped a few times which can be filled up with a glue/ sawdust mix. Then it wiull all be sanded, sealed and clearcoated.





A second channel with a bigger foot.



2 channels routed, which will not be channels but raised areas (everything is reversed in the negative mold, very confusing.



Making a foot for the router foot. ^_^



Router with larger foot. All these guiding pieces have to be perfectly alligned per channel, so 3 times.





The 2 small raised areas will be the actual double seal channel for the reusable vacuumbag. A hole will become a raised area in a negative mold, and a raised area will become a hole...

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Last edited by littlesmith; 04-21-2016 at 09:09 AM.
  #269  
Old 04-25-2016, 02:50 PM
littlesmith littlesmith is offline
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Cutting bracing wood



Spruce and cedar will be glued together to make bracings.







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  #270  
Old 04-25-2016, 06:55 PM
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Don't know about anyone else, but the pictures seem a little large to me, have to scroll around to see all of them.
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