It was beveled just like the donuts, but there wasn't a distinct transition from the flat to the bevel. The two surfaces flowed/blended into one another. Like a real donut, I suppose
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| Author: | Alex Kleon [ Tue Oct 20, 2015 10:37 am ] |
| Post subject: | Binding Jig Donut |
Is there an arbitrary bevel angle for a UHMW donut, or does it just need to clear the top and back radius with a small flat bearing point that rides on the edge? I'm using 28'R and 15'R for top and back. Thanks, folks! Alex |
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| Author: | James Orr [ Tue Oct 20, 2015 11:04 am ] |
| Post subject: | Re: Binding Jig Donut |
The donuts I had were both more like the latter. There was about an 1/8" wide flat spot that it rode on, and then the edges beveled up around, I don't know, 10° or so? |
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| Author: | Rod True [ Tue Oct 20, 2015 11:08 am ] |
| Post subject: | Re: Binding Jig Donut |
I made my own. About 1/8" shoulder and the angle is arbitrary. I think mine is probably 30+/-* |
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| Author: | Colin North [ Tue Oct 20, 2015 1:25 pm ] |
| Post subject: | Re: Binding Jig Donut |
I made mine about 1 mm at the shoulder, figured smaller is better as the depth registration is then as close to the edge of the guitar as possible. Bevel is around 25/30? degrees - enough so it doesn't ride on the the dome anywhere. The point to watch for is the back, at the heel end. |
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| Author: | kencierp [ Tue Oct 20, 2015 2:58 pm ] |
| Post subject: | Re: Binding Jig Donut |
I don't use a tower or the donuts -- but shouldn't the ledge portion be wide enough to accommodate the second pass for the purfling? Guess I am not seeing something, but if the flat ledge is only .039" (1mm) wide and a channel for the binding say, .075" has been cut where is the edge of the guitar resting during the purfling cut? |
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| Author: | Rod True [ Tue Oct 20, 2015 3:14 pm ] |
| Post subject: | Re: Binding Jig Donut |
kencierp wrote: I don't use a tower or the donuts -- but shouldn't the ledge portion be wide enough to accommodate the second pass for the purfling? Guess I am not seeing something, but if the flat ledge is only .039" (1mm) wide and a channel for the binding say, .075" has been cut where is the edge of the guitar resting during the purfling cut? The above all assumes the use of the LMI or Stew Mac (or similar) rabbit bit with bearing guide. The bit is a set size and the donut is larger than the bit. The ledge accounts for the bit size. |
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| Author: | kencierp [ Tue Oct 20, 2015 6:11 pm ] |
| Post subject: | Re: Binding Jig Donut |
The LMII design addresses my concerns -- I would want to make sure that the doughnut is riding on the "uncut" surface of the plates, if the router slips off that prime surface into a previously cut channel a mess could occur. The way I see it, the bearing guided bits prevent errors in the width of cut its the doughnut ledge surface that controls "height/depth" of cut. Check out the how to use video. http://www.lmii.com/products/shopbrowse ... ry_id=1414 |
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| Author: | Pmaj7 [ Tue Oct 20, 2015 11:28 pm ] |
| Post subject: | Re: Binding Jig Donut |
kencierp wrote: The LMII design addresses my concerns -- I would want to make sure that the doughnut is riding on the "uncut" surface of the plates, if the router slips off that prime surface into a previously cut channel a mess could occur. The way I see it, the bearing guided bits prevent errors in the width of cut its the doughnut ledge surface that controls "height/depth" of cut. Check out the how to use video. http://www.lmii.com/products/shopbrowse ... ry_id=1414 As you switch to a smaller bearing, The cutter AND donut move in towards the center of the guitar. Cool new micro adjust on the lmi! |
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| Author: | James Orr [ Tue Oct 20, 2015 11:53 pm ] |
| Post subject: | Re: Binding Jig Donut |
My evolution of binding jigs: LuthierTool jig > Williams jig > new LMI jig > Kett style jig. I haven't used my Kett style yet, but I'm looking forward to it. I wanted something small and fast. The new LMI jig is great and felt the best to me; I preferred moving the guitar into the cutter rather than moving the cutter around the guitar. I just didn't like setting up the cradle. |
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| Author: | Rod True [ Wed Oct 21, 2015 12:34 am ] |
| Post subject: | Re: Binding Jig Donut |
Nice looking tool the LMI jig. But what happens along the back radius say for a tight Florentine cutaway? That wide ledge on the "donut" of the LMI jig will actually raise the entire router higher then the rest of the binding ledge around the lower bout area. A smaller or narrower ledge reduces this greatly. |
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| Author: | James Orr [ Wed Oct 21, 2015 2:48 pm ] |
| Post subject: | Re: Binding Jig Donut |
It was beveled just like the donuts, but there wasn't a distinct transition from the flat to the bevel. The two surfaces flowed/blended into one another. Like a real donut, I suppose
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