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| Rope purfling http://w-ww.luthiersforum.com/forum/viewtopic.php?f=10101&t=52727 |
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| Author: | SnowManSnow [ Fri Dec 13, 2019 4:34 pm ] |
| Post subject: | Rope purfling |
I would like to use a rope style purfling for my build. It is .080” thick so it’s substantial for purfling, do I try to bend it with the binding in the bender or do I just pull it around the guitar like the regular small stuff? Sent from my iPhone using Tapatalk |
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| Author: | Luthier1975 [ Fri Dec 13, 2019 4:45 pm ] |
| Post subject: | Re: Rope purfling |
I tend to hand bend the thicker purflings I use. I always have problems with them cracking otherwise. YMMV I don't know how well it would do in the bender, but I just haven't ever tried that. Might as well give it a go and see what happens! Tape them all together in the correct orientation and that will help stabilize them in the bend. |
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| Author: | SnowManSnow [ Fri Dec 13, 2019 5:58 pm ] |
| Post subject: | Re: Rope purfling |
Luthier1975 wrote: I tend to hand bend the thicker purflings I use. I always have problems with them cracking otherwise. YMMV I don't know how well it would do in the bender, but I just haven't ever tried that. Might as well give it a go and see what happens! Tape them all together in the correct orientation and that will help stabilize them in the bend. So still use moisture and heat? Sent from my iPhone using Tapatalk |
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| Author: | Clay S. [ Fri Dec 13, 2019 6:27 pm ] |
| Post subject: | Re: Rope purfling |
For rope and herringbone I soak them in water for a minute or so , take them out, and allow the water to be absorbed a little. Then I hand bend them into the channel sometimes using the binding to back them up. Wetting the purfling softens the glue a little and allows the pieces to slide around a little. If you use too much water the purfling falls apart so it is a bit of a balancing act. |
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| Author: | J De Rocher [ Fri Dec 13, 2019 11:17 pm ] |
| Post subject: | Re: Rope purfling |
I do basically the same as Clay for rope and herringbone purfling. I fill a large baking sheet with warm water, place the purfling in the water for 60-90 seconds, and then tape them on edge to the sides of the guitar body and let them dry. Once dry, they hold their bent shape. The herringbone I've done was 0.130 wide and the rope was 0.100 wide. |
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| Author: | SnowManSnow [ Fri Dec 13, 2019 11:53 pm ] |
| Post subject: | Re: Rope purfling |
So just water ... They are the same width as the binding so I COULD tape them up between binding parts when I bend, but I guess the heat may cause it to delaminate Sent from my iPhone using Tapatalk |
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| Author: | Clay S. [ Sat Dec 14, 2019 12:09 am ] |
| Post subject: | Re: Rope purfling |
If you have an extra piece or two you can experiment to get a feel for how the stuff you have acts. Even a two or three inch scrap can help you know the right amount of moisture to use. Testing to destruction a small scrap might save some heartache later. I do one piece at a time rather than wetting them all at the same time. |
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| Author: | SnowManSnow [ Sat Dec 14, 2019 7:26 am ] |
| Post subject: | Re: Rope purfling |
Thanks for the help folks I’ll get it done:) Sent from my iPhone using Tapatalk |
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| Author: | Greg Maxwell [ Sat Dec 14, 2019 9:07 am ] |
| Post subject: | Re: Rope purfling |
Stew Mac has a video somewhere on their site showing how Dan Erlewine bends herringbone. |
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| Author: | doncaparker [ Sat Dec 14, 2019 9:15 am ] |
| Post subject: | Re: Rope purfling |
I think the key to bending any layered purfling is to not ask any more than 2-3 layers to bend while still glued together. The trick to bending herringbone referenced by Greg is to disconnect the outer layers of fiber from the inside layers. The inside diagonal layers and spine then bend very easily. Is the rope purfling attached to some outer layers? You might want to pull one of those layers loose before trying to bend. But be careful about separating both outer layers. It might all fall apart if you do that. |
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| Author: | Clay S. [ Sat Dec 14, 2019 9:33 am ] |
| Post subject: | Re: Rope purfling |
https://www.stewmac.com/How-To/Trade_Se ... ng_it.html That is a good information for doing tight bends. I cut the herringbone down the middle to do rosettes and other tight bends, but what the video shows looks like it will work better. If you cut the herringbone down the middle you can use it as a small rope binding or turn it sideways and use it for alternating block molding. |
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| Author: | SnowManSnow [ Sat Dec 14, 2019 10:44 am ] |
| Post subject: | Re: Rope purfling |
This is it Sent from my iPhone using Tapatalk |
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| Author: | Clay S. [ Sat Dec 14, 2019 10:57 am ] |
| Post subject: | Re: Rope purfling |
If you are bending it around the typical acoustic guitar, just wetting it will probably be enough to make it bend. Dan used heat, that might work too (I haven't done that). When you separate the layers you always run the risk of things falling apart. For a Venetian cutaway separating the layers would be helpful, so the risk might be worth it. |
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| Author: | SnowManSnow [ Sat Dec 14, 2019 11:03 am ] |
| Post subject: | Re: Rope purfling |
Clay S. wrote: If you are bending it around the typical acoustic guitar, just wetting it will probably be enough to make it bend. Dan used heat, that might work too (I haven't done that). When you separate the layers you always run the risk of things falling apart. For a Venetian cutaway separating the layers would be helpful, so the risk might be worth it. It’s a standard 000 shape so nothing crazy and fairly gentle curves Sent from my iPhone using Tapatalk |
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| Author: | Freeman [ Sat Dec 14, 2019 11:34 am ] |
| Post subject: | Re: Rope purfling |
I've used that premade "rope" style material for purfling and rosettes on a couple of guitars. I routed a little groove a piece of some sort of scrap material and prebent it using a heat gun and some water. It seemed to hold the bend well enough and not delaminate Attachment: IMG_1892.JPG Attachment: IMG_1893.JPG Attachment: IMG_1895.JPG
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| Author: | Ruby50 [ Sat Dec 14, 2019 12:46 pm ] |
| Post subject: | Re: Rope purfling |
Rank amateur here and in the last week I have bent both .130 rope and .110 rope on a hot pipe set on high. I squirted some Windex with ammonia on it. I went much tighter than you did to fit it to a rosette and had no problems. The narrower stuff was full depth, but the wider stuff was quite thin and needed care to keep it flat. I also bent ivoroid with a hair dryer and fit it into a groove to hold it and keep it flat, as it was .040 thick. The last picture is my rosette on my redwood top (with shellac). It all went easier than I thought it would Ed |
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