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 Post subject: Making a mold?
PostPosted: Mon Mar 17, 2014 1:34 pm 
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Walnut
Walnut

Joined: Sun Mar 16, 2014 10:03 am
Posts: 12
First name: Newell
Last Name: Allison
City: Chattanooga
State: Tennessee
Country: USA
Status: Amateur
This is the Jumbo kit that I purchased and am about to build.
http://www.martinguitar.com/guitar-make ... etail.html
I am fully aware that I should purchase a mold instead of building one, but I seriously can't afford that as of now and need to get the sides in the mold ASAP. My dad has experience in woodworking and he said he would help me. All I need is some dimensions, what tools to use, etc... Thank you!


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 Post subject: Re: Making a mold?
PostPosted: Mon Mar 17, 2014 1:56 pm 
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Koa
Koa
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Joined: Tue Mar 18, 2008 8:43 am
Posts: 775
Location: Florida
First name: John
Last Name: Killin
Focus: Build
Status: Amateur
Do you have a plan for this guitar?

That would be the first thing you need to build a mold. Then make a template.

If you look at the stew mac building instructions they show you how to build without a mold. The Cumpiano book also uses mold free construction.

There are some tutorial on how to build one, but the one I used is missing the useful content. Check out the tutorial section. Lots of good ideas there. Also do a search for Molds and you'll find some examples.


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 Post subject: Re: Making a mold?
PostPosted: Mon Mar 17, 2014 7:13 pm 
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Koa
Koa

Joined: Thu Nov 04, 2010 1:46 pm
Posts: 907
First name: Freeman
Last Name: Keller
Focus: Build
Status: Amateur
Take your plans to Kinkos, an architect or engineer and get two copies made. Cut one around the outside shape of your guitar.

Take a piece of 3/4 MDF or press board and cut into four piece a little larger than one half of your guitar. Clamp them together (I like to use 1/4 inch flat head bolts and counter sink the heads), true up one side (which will be the center line) and trace your plan onto the MDF. Cut out with a band saw (a saber saw will work) and you will have something that looks like this

Image

Flip them over and put some pieces of MDF across the top and bottom to splice them together - something like this

Image

I also put a couple of little spacers on the sides at the waist. You want the mold a little less tall than the height of the sides (again, get that from your plans, the neck end will be thinner than the tail). I keep the center pieces that get cut out and use them in my side bender, but you can also cut them into small pieces that will make the waist expander. Chisel a couple of notches and use a turn buckle like so

Image

Many other ways, some very sophisticated but this works for me.


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 Post subject: Re: Making a mold?
PostPosted: Mon Mar 17, 2014 8:14 pm 
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Koa
Koa
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Joined: Tue Mar 18, 2008 8:43 am
Posts: 775
Location: Florida
First name: John
Last Name: Killin
Focus: Build
Status: Amateur
This is how I do it. I pretty much follow what was in Todd Stock's tutorial.

I cut a template out of 1/4" Masonite. I work on getting this template right until it is perfect. If its not right, I scrap it and start over. Trace out the mirror image on paper to check what you will end up with. Looking at the front of the mold, the plywood section is 2" wide around the perimeter of the guitar. The outside doesn't have to be exact.
Attachment:
Template.jpg


For my mold, I use 3/4" plywood, 3 layers thick. Cut out 6 pieces that are larger than your template. Stick the template to one piece with pins or double-sided tape and pattern route it. Do this for two pieces.
Attachment:
Template Route.jpg


Glue another piece from your stack of plywood to each of these pieces.
Attachment:
Template Glue.jpg


Clamp it. I usually use my nail gun to nail them together, but I still go ahead and clamp too.
Attachment:
Template Clamp.jpg


After it dries, trim the new piece close to the previously routed piece. This helps keep your router from having to do to much work. It saves wear on the bit.
Attachment:
Template Trim.jpg


Use the previously routed piece as your template to route the next layer in the stack. Repeat for the final layer.

Drill a Hole in the top and bottom tab areas on one side.
Attachment:
Template Hole.jpg


Line up the next side and use the first set of holes as a guide to drill through the second side. Bolt them together with some carriage bolts and you are ready to go.
Attachment:
Template Final.jpg


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These users thanked the author John Killin for the post: Telemaster (Tue Mar 18, 2014 10:44 am)
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 Post subject: Re: Making a mold?
PostPosted: Mon Mar 17, 2014 8:23 pm 
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Contributing Member
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Joined: Mon Aug 23, 2010 11:42 pm
Posts: 1178
First name: John
Last Name: Parchem
City: Seattle
State: Wa
Zip/Postal Code: 98177
Country: USA
Focus: Build
Status: Amateur
I thought the martin kits shipped with a cardboard template for half of the guitar. If you have it that template can be used to make your mold as described in the above posts.

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These users thanked the author johnparchem for the post: Telemaster (Tue Mar 18, 2014 10:43 am)
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 Post subject: Re: Making a mold?
PostPosted: Tue Mar 18, 2014 10:37 am 
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Walnut
Walnut

Joined: Sun Mar 16, 2014 10:03 am
Posts: 12
First name: Newell
Last Name: Allison
City: Chattanooga
State: Tennessee
Country: USA
Status: Amateur
The kit did come with a cardboard template so that is going to be useful. Thank you guys you are very helpful.


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