One-off plug building question

[nemo]

Hi,
I designed a boat that will be built one-off. I'm not much into this kind of construction, I know the procedure but I have some doubts about the making of the plug.
The frames of the plug will be cut with a cnc router, and I figure out I have to subtract the hull thickness from the station, to give a correct dxf file to the cnc router. And what about longitudinal wood strips on the plug, how far should I put them from each other, transversely?

[gonzo]

What material is the hull going to be built of?

[nemo]

Fiberglass/Epoxy

[nemo]

I mean..solid glass for the hull and sandwich for the deck.

[SamSam]

Originally Posted by nemo

Hi,
I designed a boat that will be built one-off. I'm not much into this kind of construction, I know the procedure but I have some doubts about the making of the plug.

For a new design one-off, making a plug and a mold might not be the way to go. The time, money and marerials of a one use plug and mold could be expensive, with no guarantee the boat will be any good. Depending on the shape of the boat, a one use mold might be easily and rapidly constructed of cheap materials or a boat made more or less directly, with say c-flex, and all the time spent fairing a plug could be spent fairing the boat, and most of the materials in a fiberglass mold could just be used in a fiberglass boat. Sam

[gonzo]

If you are making a male mold, it has to be completely planked. Fiberglass molds can't have gaps.

[nemo]

Wait, I think we're going far from the thing I asked
Ok, I'll do a male mold.. the thing I wanted to know is how should I take into count the thickness of the strip plank when I draw the frames that have to be cut with a cnc router..

[SamSam]

Originally Posted by gonzo

If you are making a male mold, it has to be completely planked. Fiberglass molds can't have gaps.

If you were referring to my post above, I was thinking of that 1/8" masonite smooth surfaced 'tile board' stuff from 'Home Despots' for around $11 for a 4x8' sheet. With Bondo in the corners and a few coats of wax it works very well and depending on the construction of the mold will last for multiple uses. As mentioned it depends on the shape of the hull, as to what you can use for a mold. Re-reading your post though, I think you weren't addressing me, as I was talking about a direct female mold.? Sam

[gonzo]

The thickness to be substracted has to be perpendicular to the surface of the planking. That is, it varies as the angle of incidence of the planking changes with respect to the framing.