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Building a mold

Total Topics: 9
Total Posts: 58
I'm getting ready to build a mold for a Martin D-14 size guitar. My plan is to take the top (which is ready to go complete witht he 'ears') and scribe that to some 3/4" furniture-grade plywood pieces and cut it out.

A) am I on the right track; and
B) how much extra material should I allow to make certain I have a reasonable amount of top and back to rout for binding?

Thanks -


Aug 29, 06 | 12:10 pm
Ken Cierp

Total Topics: 58
Total Posts: 2262
Hi Barry, Martin and I think the others cut their tops oversize and they are meant to be trimmed to final shape. A blue print or something like this would be a better choice:


Aug 29, 06 | 2:25 pm

Total Topics: 9
Total Posts: 58
Hi Ken, thanks for the quick response...I have a tendency to over-analyze most everything and suspect this will be no different! I have a set of blueprints which came with the kit, perhaps the hot set-up is to copy those and use as templates.
BTW, I really enjoy your willingness to share and am really intriqued by some of your thoughts.

A seperate concern I have is I know for certain the sides have changed shape, the entire kit is in my studio which is 50 - 60% humidity (pretty good for Maryland so clsoe to the Bay), but we just had a heat pump failure so the temp is up to about 75 - 80 degrees...not horrible, but heat pumps due next week so I think I'll re-acclimate the kit before I begin and visit some of the thoughts about bending/re-bending sides.


Aug 29, 06 | 2:49 pm

Total Topics: 13
Total Posts: 71
Barry, I had a similar situation. I'm building my first kit right now. I bought a Martin kit off eBay and the guy told me he bought it about 5 years ago. Now, you can imagine how much those sides have relaxed in 5 years. So I built myself a mold to get them back in shape. Here's how I got the shape down.

I grabbed a penny nail and punched a hole on the outline of the top on the blueprints. I made a new hole about every 1/4". Then fastened it to my 20" x 24" piece of ply. I grabbed a Sharpie and made a dot on every hole I created. Then I had a connect-the-dot outline of the top of the guitar. I cut that out and then used a flush routing bit to duplicate the cut on other pieces. Here is a LMI link of what I used. I didn't do mine exactly, but it give you a good idea of what you need to do.

Aug 31, 06 | 4:43 pm

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