#1
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OM Top & Back Sanding Radius
What sanding radius templates would I need for both the top and back, when building an OM?
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#2
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I looked at this post this morning and didn’t understand it, so I’ve waited for others to say something. Looks like I’m not alone.
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#3
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I would like to use radius discs for sanding the kerfing of both the top and back. The Stewmac instructions suggest using a sanding stick (one degree and 5 degrees). What would that translate into if I was to use a radius disc instead?
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#4
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My guess is that he wants to use radius dishes. I don't use them so I cannot make a suggestion but if you search online or wait for another response here, for radius dishes, then you will find a lot of info.
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#5
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Looks like we replied at the same time. A radius is a radius so if the stick is 5deg then so would the dish be, I would think. Most people it seems measure by foot.
Have a look at these here: http://www.bluescreekguitars.com/sho...roducts_id=202 |
#6
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OM Top & Back Sanding Radius
I’m trying to decide which radii to purchase. 1 & 5 degree translate into what radius?
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#7
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Depends what you are building. What are you using for the brace radii? Making braces from scratch or preshaped? Using a kit?
StewMac kit uses 20' back and 28' top radii. If you're making one guitar skip the sanding discs. Use the kerfed lining sanding stick with wedge. https://www.stewmac.com/freeinfo/i-W...2.doc.1219.pdf Last edited by JonWint; 04-05-2020 at 03:22 PM. |
#8
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15' for the back; 28' for the top.
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#9
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I think the confusion might lie in that you can't really translate an angle into a radius. If you think about a back brace sanded to a 15' radius, the "angle" of the curve increases as you get farther from center. So, not sure what StewMac is suggesting, but a 15' back and 25' top is what I would do.
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#10
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Thanks for the replies, that was what I was after. I plan on building a couple, so I will look to pick up the appropriate sanding disks. I believe these will do a more uniform job than the stick outlined in the instructions.
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#11
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Quote:
The first thing to understand is what is the contour of your tops and backs. A sanding disk will give you a spherical shape. I use a cylindrical shape for tops. Others start out with a spherical shape and then alter it, particularly in the upper bout. Sanding disks can make sense - and be easier - if what you are making conforms to that. My point is simply that it isn't a given that sanding disks do a more uniform or better job in all circumstances. |
#12
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Charles,
Could you tell me more about why someone would alter the upper bout? To what benefit? |
#13
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To achieve the desired neck angle.
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