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| Hand powered sanding dish -Any Pics http://www-.luthiersforum.com/forum/viewtopic.php?f=10102&t=8585 |
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| Author: | GregG [ Sun Sep 24, 2006 8:43 am ] |
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I would love to have an electric powered sanding dish, and I might some day, but for now I was hoping someone might have pics of a sanding dish that was powered by hand, but not just one that is hand-held above the rims. Maybe similar to an electric set-up but handles? instead of pulleys and belts. Anybody have anything like this? looking for simple, cheap and effective. To date I have used the dish as a giant sanding block, round and round back and forth on the rims which works, but there has got to be something better. Thanks, Greg |
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| Author: | letseatpaste [ Sun Sep 24, 2006 10:18 am ] |
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I use a small piece of pipe with a pipe flange screwed onto my mold's base. Then I put a crank handle on the dish (it has a metal insert so the handle is removable). Then you crank it round and round, makes pretty quick work of it. Most people don't use molds like this, but I bet something similar could be worked out for other mold styles. 
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| Author: | tippie53 [ Sun Sep 24, 2006 10:35 am ] |
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http://www.bluescreekguitars.com/ar0007.htm This link will show something very simialr as above. There isn't much you can do as this is as simple as you can be. I do over 100 kits a year with this method, Works great john hall |
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| Author: | phil c-e [ Sun Sep 24, 2006 3:49 pm ] |
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i don't have any pics handy, but i'll try to explain. i've drilled two holes near the edge of the dish on opposite sides of the center hole. into those holes i've inserted 1/4" - 20 thread inserts. i use the kind without a shoulder on them so that the whole insert is 'buried' inside the mdf. these cost about .25 at lee valley. then i bought two big plastic knobs with 1/4" - 20 thread on them but don't screw them all the way into the inserts. with the rims in the mold and the mold centered over a dowel (similar to jon's use of the pipe) i am able to grab the knobs and twist back and forth much more aggressively than if i try to do the twisting/spinning by just holding the edge of the mdf (which also tends to sand the skin off the fingers). i mark the rims with a contrasting color and check after each 70 twists or so to make sure that my weight and pressure are achieving symetrical results. without checking you could end up with an unintentionally wedged body. hope that helps. i know it's a lot slower than a full blown electric rig. but in my 10' x 10' workshop, it gets the job done. phil |
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| Author: | Jim Watts [ Sun Sep 24, 2006 4:31 pm ] |
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Mine is very similar to John Halls. I have locating holes in my base board that the post is attached to and in my outside mold so everything goes up the same way every time. I also tip the post for sanding the back contour. |
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| Author: | GregG [ Sun Sep 24, 2006 11:16 pm ] |
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Thanks guys, why didn't I think of that. Do you find that the sandpaper disks are the best option for this operation? Thanks, Greg |
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| Author: | letseatpaste [ Sun Sep 24, 2006 11:31 pm ] |
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I use a 4" wide roll of 80grit with the adhesive on the back and that's worked really well so far. |
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| Author: | GregG [ Sun Sep 24, 2006 11:40 pm ] |
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Thanks Jon...where are you getting your 4" rolls of self-adhesive sandpaper? Also, do you try to take the sides all the way down to the appropriate dome with the disk, or do you remove a portion of the sides with something else first then finish up with the disk. Thanks Again, Greg |
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| Author: | Homeboy [ Sun Sep 24, 2006 11:41 pm ] |
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Jon, Really cool idea there. I am still sanding by rotating the mold on top of the dish to get my radius. I like the idea of your jig a lot. Thanks. Homeboy |
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| Author: | Serge Poirier [ Mon Sep 25, 2006 12:23 am ] |
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Jon, i like your mold a lot as well as your set up for sanding. Your mold: Do you glue the pieces of wood around the perimeter of the guitar shape or do you screw them from underneath please? Thanks Serge |
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| Author: | letseatpaste [ Mon Sep 25, 2006 12:45 am ] |
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Mold and jig ideas are courtesy of Harry Fleishman. I profile the sides with a handplane first, it would take way too long to sand all of that, especially when you figure in the back taper. I use the mold to mark the profile on the sides as follows: 
The general idea is to set the dish up on blocks at the neck/tail blocks and use the compass to transfer the profile. You use different size blocks if you want a taper from front to back. There have been threads about this before, it's worth a search in the archives. I use Porter Cable sandpaper rolls, I don't know if it's any better or a better value than any other brand. They seem kind of expensive, but the convenience is worth it in my estimation. I have several different grits hanging on a pegboard with shop scissors hanging next to it. The box acts as a dispenser, it's real handy that way. I'm sure non-adhesive rolls would work fine with some 3m spray adhesive. Serge, I glue the blocks. Just takes a little dab of titebond to hold it in place. Then you can knock them off with a hammer later if you want to make a different body shape. You also have to knock off the blocks near the head and tail when gluing the neck and tail blocks to the sides, then reglue the mold blocks back in place. Pretty primitive, but works well and is cheap and quick to make with limited tools. |
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| Author: | Serge Poirier [ Mon Sep 25, 2006 7:40 am ] |
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Thanks much Jon, simple and brilliant at the same time! 
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| Author: | Shane Neifer [ Mon Sep 25, 2006 8:38 am ] |
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Greg, A few of the sponsors, me included, sell one piece pressure adhesive sandpaper. A MUST for powered rim sanders like mine and I would think probably much better in the long run for even hand ones. If an edge comes up it can cause damage......don't ask how I know  . Never had an issue with one piece 24 inch discs. Mine are 80 grit and I like them a lot!
Shane |
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| Author: | Shane Neifer [ Mon Sep 25, 2006 8:40 am ] |
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Doubled up again.....sorry! |
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| Author: | Serge Poirier [ Mon Sep 25, 2006 8:42 am ] |
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Greg, i havesome of Shane's sandpaper discs and it's a treat to work with! |
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| Author: | Tom Morici [ Tue Sep 26, 2006 5:48 pm ] |
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Here's mine I just used it today. I don't do the round and round thing. I grab the dish and rotate it left and right. after a dozen or so times I rotate the dish a 1/4 turn. and repeat. the pivot pin angle adjusts to do the back taper. 
Tom |
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| Author: | Serge Poirier [ Tue Sep 26, 2006 9:57 pm ] |
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Hey thanks for that tip Tom, i was doing it just like you, 1/4 turn at at time, left and right, and was looking for just an idea like this! |
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