Search the Community
Showing results for tags 'rib'.
Found 2 results
Here is the custom design I created to thin my violin rib. It is basically a suction MDF box with a groove over it that holds in place the rib. It works over the table of a press drill. I was using a Delta press drill with an extra large platform. I was using a Safe-T-Planer mounted on the drill to thin my ribs. It is very accurate. It does not produce a fine powder like when we are using a belt sander. It is a known that the fine powder coming from hard wood is toxic for the lungs. It is pretty safe to use the Safe-T-Planer. It can be found here: http://www.stewmac.com/Luthier_Tools/Types_of_Tools/Planes/StewMac_Safe-T-Planer.html?utm_source=bing&utm_medium=cpc&utm_campaign=TXT%3A New Products&utm_term=safe t planer&utm_content=Safe-T-Planer The measurements of the box are:Length = 762 mmWidth = 153 mmHeight = 120 mmThe MDF thickness is 16 mm.The width of the groove is 43 mm. I used a router to make that groove being .6 mm deep.The open part for the adaptor suction part is 56 mm wide. I connect to it a Shop-O-Vac vacuum. We start to thin from the middle of the rib in place, then going to one extremity, and we start again into the centre and we complete until finished toward the other extremity. This approach about 80 % of the time usually used with the traditional method using a plane.
I haaaate ripples along the grain in cello ribs. The ribs I bent are supposedly all from the same chunk of tree, so I don't understand why some of them got the strong wrinkle and some not at all. Makes me want to blame the wood rather than my technique. So I guess my question has two parts: 1. Looking at unbent ribs, are there any signs that can tell if one's going to be a ripple-prone rib? Is it variation in grain? Did I thickness unevenly? Does it have something to do with seasoning? 2. Does anyone have some technique tips to share on minimizing the ripple? Photo comparing the two C-bouts below.... one has a nasty wrinkle and one does not, though they are from the same piece of wood. (This is my first cello.)