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 Post subject: Building a mold?
PostPosted: Mon Mar 17, 2014 2:35 pm 
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Joined: Sun Mar 16, 2014 11:45 am
Posts: 6
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: Building a mold?
PostPosted: Mon Mar 17, 2014 3:00 pm 
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Joined: Wed Nov 02, 2011 9:13 pm
Posts: 162
Here's what you need:

http://www.liutaiomottola.com/Tools/Mold.htm

There are many ways of building molds, and most of the better books on guitar-making have descriptions of how to build one.

It's not hard to do, if you have access to a bandsaw and a lot of plywood or particle board that you don't have any other use for.


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 Post subject: Re: Building a mold?
PostPosted: Mon Mar 17, 2014 4:41 pm 
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Joined: Fri Mar 03, 2006 7:09 pm
Posts: 5419
Location: Hegins, Pa
I would advice that you use at least one ply of plywood , MDF will creep a good bit.

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John Hall
Blues Creek Guitars Inc
Authorized CF Martin Repair Center
Board of Directors of Association of Stringed Instrument Artisans
http://www.bluescreekguitars.com


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 Post subject: Re: Building a mold?
PostPosted: Mon Mar 17, 2014 4:44 pm 
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Joined: Sun Mar 16, 2014 11:45 am
Posts: 6
Is there a way to do it without a mold? Which do you recommend and what generally gives the best results? Thank you.


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 Post subject: Re: Building a mold?
PostPosted: Mon Mar 17, 2014 6:01 pm 
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Joined: Sat Apr 10, 2010 10:50 pm
Posts: 2281
Location: Seattle
The stewmac instruction show building without a mold. http://www.stewmac.com/shop/Kits/Acoustic_Guitar_Kits/Dreadnought_Guitar_Kit.html?tab=Instructions.

I have seen a lot of posts of kits built this way. You do need an accurate profile of the top, so that you can make a couple of cardboard cutouts.

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http://www.harvestmoonguitars.com


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 Post subject: Re: Building a mold?
PostPosted: Mon Mar 17, 2014 6:19 pm 
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Joined: Fri Mar 03, 2006 7:09 pm
Posts: 5419
Location: Hegins, Pa
I have issues with inside molds.
If you are experienced you may build without one but to the unskilled and untrained I have seen too many fail for a simple reason. The body geometry get out of whack.
The mold does a few things , 1 it holds the neck in proper position for the neck angle and set. If you never set a neck , having a neck block out of position will make this a nightmare and may kill the desire to build,
2 the symmetry is dependent on the mold. I won't build without one. I am approaching #180 and it is getting easier to hit the perfect set up. You are going to spend 100 hrs to make this guitar and you can make a simple mold to help assure success.
I would rather you make a mold of cardboard that can keep things set up till the neck and top are on. The better you control the details the better the end result. If you make one out of stacked cardboard and use duct tape to make it secure , you can cut this away at the end of the project you will be better off than free building.

_________________
John Hall
Blues Creek Guitars Inc
Authorized CF Martin Repair Center
Board of Directors of Association of Stringed Instrument Artisans
http://www.bluescreekguitars.com


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 Post subject: Re: Building a mold?
PostPosted: Tue Mar 18, 2014 6:52 am 
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Joined: Wed Aug 22, 2012 8:17 am
Posts: 217
Location: North Jersey
Hello.
I was in the same exact place a short time ago, saying the same things you are... I would strongly suggest you follow the advice of buy your mold from Blues Creek Guitars, John (he is supplier to Martin for their molds) and build your guitar. I did and it was probably the single smartest guitar building decision I ever made... It will save you in the long run. I can't think of a more important tool to have except maybe a set of nut files... Good luck, it is quite a journey and will more likely than not, be a life time of building for you.

Sincerely,
Rich


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 Post subject: Re: Building a mold?
PostPosted: Mon Aug 14, 2017 11:42 am 
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Joined: Mon Oct 17, 2016 10:47 am
Posts: 17
Location: Orangevale, California
I agree with John. I got a J-45 mold, and had the back and sides bent for me from another company. My sides had a lot of spring back. This became a problem. I had to use spreaders and clamps to make sure they are against the walls of the mold. If you have that problem with an inside mold, i believe it would be definitely change your chances for success.


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 Post subject: Re: Building a mold?
PostPosted: Mon Aug 14, 2017 11:56 am 
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Joined: Fri Mar 03, 2006 7:09 pm
Posts: 5419
Location: Hegins, Pa
the mold does 2 main things
A holds the shape
B controls the neck block

If you can't do these 2 things your success drops off dramatically
You can make one and if you bought this from Martin there is a side tracing in the box that you can use to make your mold from.

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John Hall
Blues Creek Guitars Inc
Authorized CF Martin Repair Center
Board of Directors of Association of Stringed Instrument Artisans
http://www.bluescreekguitars.com


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 Post subject: Re: Building a mold?
PostPosted: Tue Aug 15, 2017 6:03 am 
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Joined: Wed Aug 13, 2014 12:14 pm
Posts: 943
I have built several molds for a guitar, a cittern, and three dulcimers. Getting the mold right makes a huge difference. Given the amount of work involved in building a good mold, John's molds look pretty cheap.
You can manage with a kludgey mold, but building a guitar is difficult enough without purposely adding to the misery.

If you do build your own mold, don't cut corners. Use good plywood, like Baltic birch, and. good clamps to hold it together. You can get toggle clamps from McMaster Carr.

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Everybody is ignorant, only on different subjects. -- Will Rogers
There are lots of people who mistake their imagination for their memory. - Josh Billings
Anything is possible if you don't know what you are talking about.


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