You can't, can you?
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| Oval sound holes and rosettes http://mowrystrings.luthiersforum.com/forum/viewtopic.php?f=10101&t=15772 |
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| Author: | LaurieW [ Wed Feb 06, 2008 7:51 pm ] |
| Post subject: | Oval sound holes and rosettes |
I have a Guild guitar that has an oval sound hole and abalone rosette..how does an amateur builder route the channel and cut the soundhole? I don't recall seeing anything out there that would allow someone to do that.... Laurie |
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| Author: | WaddyThomson [ Wed Feb 06, 2008 7:53 pm ] |
| Post subject: | Re: Oval sound holes and rosettes |
You can't, can you?
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| Author: | Dave Fifield [ Wed Feb 06, 2008 8:18 pm ] |
| Post subject: | Re: Oval sound holes and rosettes |
You could use a laser. I plan to use my 45W Epilog EXT to do this kind of thing  DF |
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| Author: | douglas ingram [ Wed Feb 06, 2008 9:19 pm ] |
| Post subject: | Re: Oval sound holes and rosettes |
Use a router pattern that sets one half of the rosette, route it, then flip it over and route the other half. Obviously, it has a locating hole in the center. A little clean up might be required along the center seam. |
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| Author: | TommyC [ Wed Feb 06, 2008 11:49 pm ] |
| Post subject: | Re: Oval sound holes and rosettes |
If you are doing only one you can cut the soundhole out with a fretsaw, touch up with sanding sticks. Should be able to make it look real clean. Then, to rout the rosette ring, use one of those gizmo's that stew mac sells for routing violin purfling. |
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| Author: | Don A [ Thu Feb 07, 2008 12:23 am ] |
| Post subject: | Re: Oval sound holes and rosettes |
Laurie, I'd think you'd use a jig like this with a router, dremel or an exacto blade. I'm sure it could be built using t-track or miter slots. It would also require 2 or 3 alignment pins through the top to hold it in place, rather than the 1 used to cut a circle, to prevent any rotation of the jig itself. You might be able to use a scrapbookers oval mat cutter. Oval jig Craftsman also used to sell a router jig which worked just like the old spirograph toy. I've got one but haven't been brave enough to ruin a top yet. 
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| Author: | Chas Freeborn [ Thu Feb 07, 2008 9:40 am ] |
| Post subject: | Re: Oval sound holes and rosettes |
All of my instruments have oval soundholes. I do them with a 3/8" thick mdf pattern and a router with a rub collar. I make the pattern by drawing it on my CAD program, printing it, spray adhesive to the mdf and carefully cut it out. You can use a oval template available from art or drafting supply houses too. Once you've made the router patterns the soundhole and rosette takes minutes to cut.  -C |
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| Author: | Kirt Myers [ Thu Feb 07, 2008 9:50 am ] |
| Post subject: | Re: Oval sound holes and rosettes |
Here's a link to the Luthierforum for a beautiful guitar made by Otis Tomas of Nova Scotia. http://www.luthierforum.com/index.php?showtopic=2146&hl=Otis%20Tomas&st=15 |
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| Author: | Howard Klepper [ Thu Feb 07, 2008 12:33 pm ] |
| Post subject: | Re: Oval sound holes and rosettes |
There's a set of orange plastic oval templates that is carried in a lot of woodworking catalogs.  It gets trickier on an archtop: 
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| Author: | Dave Stewart [ Thu Feb 07, 2008 5:30 pm ] |
| Post subject: | Re: Oval sound holes and rosettes |
Beautiful work Howard. I'd love to know how you did that archtop! |
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| Author: | Howard Klepper [ Fri Feb 08, 2008 1:53 am ] |
| Post subject: | Re: Oval sound holes and rosettes |
cut the soundhole with router and template (after carving the top--put wedges under the template to hold it level. I guess it could be cut with the top flat, but I was afraid that the edges of the hole would get messed up in the carving). Then gramil (Schneider style) and chisel for the rosette. |
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| Author: | KenH [ Fri Feb 08, 2008 1:56 am ] |
| Post subject: | Re: Oval sound holes and rosettes |
Where does one go to find a sleve for a dremel tool? I actually have wanted to try this method for other things, but havent seen any sleeves for small dremel size bits. better yet would be some kind of bearing for a 1/16" bit... even a 1/8" bit bearing would be nice to have. A thin sleeve would be the better thing I am thinking though..It would make duplicating inlays a snap |
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| Author: | Sam Price [ Fri Feb 08, 2008 3:10 am ] |
| Post subject: | Re: Oval sound holes and rosettes |
Kirt wrote: Here's a link to the Luthierforum for a beautiful guitar made by Otis Tomas of Nova Scotia. http://www.luthierforum.com/index.php?showtopic=2146&hl=Otis%20Tomas&st=15 Thanks for the link Kirt, I'm liking that method. Bookmarked. ![[:Y:]](./images/smilies/smiley20.gif "Thumbs Up")
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| Author: | Darren W [ Fri Feb 08, 2008 1:55 pm ] |
| Post subject: | Re: Oval sound holes and rosettes |
Ken, Is this the kind of thing you're after? [/url]http://www.amazon.com/exec/obidos/tg/detail/-/B000VJKA6Y/ref=ord_cart_shr?%5Fencoding=UTF8&m=ARXEF4B1AHJ8U&v=glance[url] Darren |
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| Author: | KenH [ Fri Feb 08, 2008 2:23 pm ] |
| Post subject: | Re: Oval sound holes and rosettes |
Thanks for the link Darren! That is close to shat I am looking for and may work with a little adjusting. I notice that it comes with a 1/4" shank bit.. I was hoping to find one for a 1/8" shank bit. I may buy one just to try it out. |
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| Author: | Arnt Rian [ Fri Feb 08, 2008 2:45 pm ] |
| Post subject: | Re: Oval sound holes and rosettes |
Here's how Mark Franzke of Flinhills Mandolins make the oval rosettes on his arch top mandolins. http://www.banjodog.com/flinthillsmandolins/tutorial_rosette.html Lovely instruments, don't you think? 
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| Author: | Dave Stewart [ Fri Feb 08, 2008 3:05 pm ] |
| Post subject: | Re: Oval sound holes and rosettes |
Howard & Arnt, thanks much! |
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