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| Cumpiano workboard thickness, material? http://luthiersforum.com/forum/viewtopic.php?f=10101&t=45421 |
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| Author: | Jimmyjames [ Wed Mar 25, 2015 3:16 am ] |
| Post subject: | Cumpiano workboard thickness, material? |
Does the Cumpiano workboard have to be 1.5 inches thick? Let's suppose I made it from red oak can I make it thinner, say 1/2 or 3/4? I did notice in a photograph he's got the neck support overhanging his bench so there's a rigidity issue. Is there some reason, something I'm missing? Thanks, -jj |
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| Author: | Glenn_Aycock [ Wed Mar 25, 2015 6:45 am ] |
| Post subject: | Re: Cumpiano workboard thickness, material? |
It doesn't have to be. You just don't want it flexing too much. You could always run a 1x2 down the center to stiffen it. Maybe two so it sits properly. That will also raise it so you can get clamps underneath. |
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| Author: | Jimmyjames [ Wed Mar 25, 2015 8:29 am ] |
| Post subject: | Re: Cumpiano workboard thickness, material? |
Thanks for the response! -jj |
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| Author: | Hesh [ Wed Mar 25, 2015 10:51 am ] |
| Post subject: | Re: Cumpiano workboard thickness, material? |
Cumpiano dosn't even use the work board anymore according to updates on his site - you may want to consider building as most do with an outside mold. |
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| Author: | Jimmyjames [ Thu Mar 26, 2015 2:30 pm ] |
| Post subject: | Re: Cumpiano workboard thickness, material? |
I've been reading up on outside molds and this has opened up a keg of questions. I have been confused at the concepts of the 1.5 degree slope from waist to shoulders and how this was done on a workboard with the guitar upside down, I see now that the mold facilitates this. I suppose there's many other advantages to the mold that I'm unaware of but I'll trust your experience and set down the path of a mold. Can you tell me the best link for a mold to copy? Can I make it out of hardwood? With my handtool and bandsaw only workshop cutting plywood isn't ideal. I can cut rough edges with the bandsaw but getting to the line requires the use of a cabinet makers rasp and i don't want to dull my rasp. If it makes any difference I'm planning a OM Florentine cutaway. Thanks, -jj |
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| Author: | kencierp [ Thu Mar 26, 2015 5:14 pm ] |
| Post subject: | Re: Cumpiano workboard thickness, material? |
A good way to make a mold is to have the guitar shape 1/2 master template about 2" wide all the way around. Drill a couple of pilot holes, these are used to pin the template to your blanks. Mark the blanks 6 or 8 depending on how deep you want the mold --- I believe LMII and SM use low density fiber board. I/we (KMG) prefer MDF seems more stable. Cut the blanks a fraction over size on your band saw -- then by pinning the template to the blank and using a bearing guided flush cutting bit in a router, you can produce perfect copies of the template profile. Stack and glue -- done. |
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| Author: | mkellyvrod [ Fri Mar 27, 2015 7:22 am ] |
| Post subject: | Re: Cumpiano workboard thickness, material? |
To answer your original question, I use a double thickness of birch plywood. I found the workboard easier to work with by putting some feet on the bottom; makes it easier to work with clamps. I sometimes use an outside mold to help me get things lined up properly, but since I started using a bending machine, I found that I can usually build without an outside mold. You'll find as you go along that you'll develop your own approaches, but getting started I followed Cumpiano then adapted as I went. I pretty much like working with birch plywood, and don't find it expensive considering how often I use my forms/molds. Excuse the mess on my work space; it's generally not that cluttered. |
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| Author: | Colin North [ Sat Mar 28, 2015 2:41 pm ] |
| Post subject: | Re: Cumpiano workboard thickness, material? |
I love those dumpy legs under the workboard, so cute! |
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