Official Luthiers Forum!

I just built a three layer MDF mold for my harp guitar project. It's about 3" wide. It us shaped just like the harp guitar in a bid to reduce weight. It's still darn heavy. Question is, have I goofed? Will this thing be too flexible given that it's made entirely out of MDF?

Should be fine. I used the same.
Have you got a photo?

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Greg
http://garibaldiinstruments.com/

Yes I do have pictures! But can't upload them with my iPhone and I'm too lazy to find a computer. But I can upload it at work tomorrow. Maybe one day lance will fix the server bug.

Lot's of my molds are mdf too, work just fine.

It's probably fine. Feels quite rigid.

I have sound the MDF will move ,it is ok for a build or 2 . Just by adding a layer of plywood will stiffen it consierably

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John Hall
blues creek guitars
Authorized CF Martin Repair
Co President of ASIA
You Don't know what you don't know until you know it

I've only ever had MDF moulds, some have had 10+ guitars made in them and they are still as good as new.

Colin

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I don't believe in anything, I simply make use of a set of reasonable working hypotheses.

If the wood in the mold is so springy that its bending the mold, there's a problem. I use MDF molds on all of my guitars. Never a problem. You should be just fine.

Well, like I said, it is pretty darn rigid. It was only after I built it I got to thinking about it. I know guy who built a work bench using 3 layers of 3/4" MDF and he had flex problems. I like John's idea of sandwiching a piece of plywood. Maybe on my next go around if I can ever find Baltic birch locally. Lets see how it behaves with waist exspanders.

BTW, when did we get automatic spell checking?

Mike