I've started my nylon string crossover guitar

[John Parchem]

I have had to level my drum sander a couple of times now. I agree that you are OK with the thickness you have for a nylon string back.

[Dave Bagwill]

-May I have a word with you, Ben?
-Sure, Mr. Robinson
-I have one word for you, Ben, just one word
-Yes sir?
-(whispering) Shims. Shhh. That's it. Shims.


The only way I can keep my performax 16-32 drum completely level over the table is by the use of two small sheet-metal shims. I lift the open end of the drum carriage up with one hand, and slip a shim under the adjusting screw on the other. I do that on both the upper screws. Perfect.

[Kevin in California]

Coo cootch a coo Mrs. Robinson.

There is no support on the outward end of the drum on this Ryobi version of the 16/32 and I think I need to add one, then perhaps I can adjust it closer across the drum. There are some shims already there too, but I didn't put them there. This think WAS accurate to about .005" when I first started using it. Thanks for the "hint" Dave.

[Kevin in California]

Okay the end blocks are glued to the sides, and tonight I sanded the top edge of the rims flat, they are ready for kerfing.
Back is joined, I'll get some bracing on it soon.

Kevin

[John Parchem]

Have you decided on you top bracing pattern? I have a crossover in my future, so it will be fun to watch this one.

[Kevin in California]

Yes, I have a pattern traced to accomodate this OM shape, and the bridge position for a 14th fret neck.
I believe it is a 7 brace fan arrangement with pretty much standard bracing below and above the sound hole. There is a bridge patch too.
John, I know you have done a couple of classicals. What are thinking for body, frets to body, etc for your future crossover?

Kevin

[John Parchem]

I will go with an O0 close to what you have, but I will go 12 frets to the body, using a martin short scale. That will put the bridge in the middle of the lower bout. I use a bridge patch about 1 mm thick. It seems that there is a divide in the classical community for or against the patch. I also will use 7 fan frets.

I think the main thing to watch out for is the neck geometry, The strings are lower at the saddle than a SS. On my classical guitars with 12 frets I now pitch the neck forward slightly (the nut end of the neck 2 mm higher than the plane of the top.) In this case a straight edge on the an unfretted board would be 2 mm into the top. This difference from a SS comes from 2 reasons.

• String height at the saddle is typically 2 to 4 mm lower than a SS.

• The action at the 12 fret is at least a mm higher than a typical SS