Designing a Plinth


From a couple of other threads here, I've developed an interested in making a plinth and am wondering about material(s) and design.

Looking to make a simple, solid plinth (unsuspended) on which to place the components from a Well Tempered Classic. Many here seem to think that Cocobolo wood is one of the best materials, but what else would work equally as well or better? Perhaps Mesquite? Perhaps a sandwich of different materials?

Also, what kind of engineering (thickness, shape,etc) is needed? Do I simply cut a piece of material to taste? Non-parallel sides are supposed to be the best, but are there any other guidelines? Do I somehow isolate a separate armboard from the plinth? What kind of feet?

On the surface, this project seems easy (cut up some wood and drill a couple of holes), but what's the secret to a great plinth for this application?

Jim

jimbo3
Smotyka- No, I'm not looking to replicate the WT plinth. THe thought was to do simple straight non-parallel cuts on about a 2" thick piece of wood. Either triangular or a 4-sided piece with the right side being only about 4" deep- just enough to handle the arm and armrest.

I don't have any woodworking equipment to speak of, so the project needs to be simple. If need be, I can find a little time on a planer.

Alot of species have been mentioned on this thread, but I wonder which would have the best characteristics for a plinth considering resonance and other such technical issues. Maybe a sandwich of ebony and rosewood might be a good combination!

Jim
OK guys, I see this has taken off a little since I last checked in.

David, since I've done both wood and acrylic, I assure you it is true: Acrylic costs more. And it does not have the forgiving properties of wood. I like your wood list, some would look very interesting. Also, there is basically no Teres design directions. Just a set of dimensions that I chose not to follow too closely. I went bigger all the way around, and figured out my own shot loading pattern. Description follows....

Prpixel, a man after my own heart. I try and keep every little piece and scrap of exotic wood I can find. Veneer too. How else can you be with what wood costs these days? I agree that the pieces come in handy for inlays, accents, etc.... Luckily I don't have to worry about storage, because my shop has about 4000 square feet. Then my buddy Paul's shop has another 4000, and that's where the serious wood is. I may be the only person I know who has made cauls out of cocbolo. I had a cutoff from my plinth that worked perfect! You may be interested in my wood guy. Check out his site:

East Wake Hardwoods

Rodger has a great selection and is a hell of a guy. Last time I was there I spent 2 hours perusing. He has some estate cocbolo form the 1920's in 8/4 that is to die for. That's what I used in mine. Almost all of his wood (99%) is priced per board foot. I collect wood too.

Jim, when I did my plinth, I used several pices of cocobolo and one piece of ebony. I used 2 pieces of cocobolo for the bottom, about 2" thick glued on the indside edge. For the top there are 4 pieces (3cocobolo, 1 macassar ebony). The two outside pieces are solid cocobolo about 2" thick, glued to the two center pieces. THe ebony is about 3/4" with another piece of cocobolo under it. They were glued up first, the the outside pieces glued to them. Then the top and bottom were glued together. DO NOT USE SCREWS! EVER! The grains run in different directions on these two pieces to give it some added stability. Then came the veneer, which is a whole other story. The shot pattern is kinda, but not really random. I drilled 2" holes 2 1/2" deep, put EXACTLY The same amount of shot in each hole, and plugged then with teak. If you look at the pics, the teak has some really nice grain that is the same on all of the plugs. That little detail took two hours alone.

So, there you have it. Now, on to some materials issues. Jim, ebony & rosewood would both work and look very well. But remember, macassar ebony runs about $50 a board foot. This can make mistakes costly. Teres makes plinths out of rose wood, and I used Madura, a brazilian rosewood for my base. It is similar to cocobolo, but not quite as dense. I would have to say there is no "best" material. There is a lot of good, some great, but too many possibities for a best. Lead helps. I don't think anyone will disagree with that. Use #9. I got mine on the net.

Also, I have found that almost any wood will tear if you are not careful. Macassar ebony is exteremely hard, but tears very easily. I've worked several woods that I swore I'd never touch again. When it happens, I usually just put down the tools, go have a smoke, and give it a few minutes. If I can do this before I throw the piece across the shop, I can usually figure out what I was doing wrong, and fix it. BTW, with acrylic, no such luck. I won't admit to being a master of solid surface material, but I have done a shitload of countertops and sinks. Since my brand, Staron, is 100% acrylic I thought it would lend itself well to TT's. Right now, I need to overcome some issues that do not arise doing countertops. But it looks very promising so far.

On cones, I and others here still think Audiopoints are the way to go. I have them under my plinth and under the base. No matter how you build the plinth, these are very important for a non-suspende table. All you have to do is try the cone of your choice and you will definitely see what I mean!

Buscis2, if your tool of choice is a checkbook, email me!

And I'll say it again: The only affiliations I have are with me.
Jimbo, I have been sitting back with great interest reading this thread as it has progressed. There have been some great contributions. I was impressed by the workmanship entailed in Jphii's turntable.

Last evening, I stumbled across the website I have provided below. I have never seen such a complete and diverse offering in terms of wood selections and pricing. Maybe that it is simply due to my lack of knowledge and exposure in this subject. Although, I found the "Musical Grade Hardwoods" section particularly interesting.

Hopefully it will provide some additional info for everyone involved. Ed.

http://westpennhardwoods.com/default.htm
Prpixel, I only provided the descriptions of woods that I found in a catalog after giving my own description previously and as an alternative the description you gave of Mara which looked for all the world like a cut and paste. Yes, the descriptions of some woods (not unlike audio components) can be deceiving depending on what the marketer is trying to market.

Having worked in or around a wood shop for 40 years, I knew EXACLTY what you meant by "tear out", I just didn't find it the serious problem that you did with regard to Quina. In retrospect, though, it is probably not the wood I'd suggest to someone who has not used it in more than a few projects or to someone who does not have at least some commercial-grade machines, like a shaper and joiner.

I like the look of the Argentine LV better myself. At the $9.00 I was paying (my guy says $8 today), it isn't badly price. At the $15 you said you're paying, I'd maybe think twice.

Jim, an ebony/rosewood combo would be beautiful. Because I am just getting into this with respect to plinths (not sure I want to go with wood for a platter just yet) I apologize for not being able to offer better suggestions visa vis resonance issues. I know what would sound good and the differences between many woods for musical instruments, but a good number of those would not offer the best properties for a plinth. Since Teres is one of the first companies to offer wood platters and plinths on the market (at least to the degree they use wood) perhaps they have done a comparison of numerous woods and would share the results of those that they reject and why. But then, what sounds good to some might not be the choice of others. In the end, I think the field is very open with respect to what wood is the best combination of looks, performance, and workability. Hopefully, more than a few of us will give it a try and report our impressions. In time, I will certainly do so.