I like your caster support system, simple but practical.
Bob
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| Powered Dish Sander http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=48649 |
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| Author: | Mike Franks [ Tue Dec 06, 2016 7:48 pm ] |
| Post subject: | Powered Dish Sander |
I just finished my powered dish sander and am happy to not have to "drive the bus" with manual steering! I used a 1/4 HP gear motor with 72 RPM output, flexible coupling and flange bearing which drives a sprocket that I modified as a drive plate with 3/4" spindle and a 1/4" drive pin. The radius dishes have a corresponding 3/4" center hole and 1/4" drive pin hole and the whole mess rides on 8 ball bearing casters. I added a foot switch for start/stop. I couldn't be more pleased with the smooth, quiet operation of the machine and the 278 inch/pound torque rating of the gearmotor is very powerful and does not slow down with even the hardest of sanding. I have sanded ukuleles and jumbo size guitar frames and it sure beats manual sanding. I purchased all of the mechanical components on good old eBay and was happy with the quality of everything that I received. Mike Franks mjfranksguitars.com http://www.facebook.com/mjfranksguitars |
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| Author: | meddlingfool [ Tue Dec 06, 2016 8:00 pm ] |
| Post subject: | Re: Powered Dish Sander |
Very nice! We've been thinking of building one, but vertical to save space... |
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| Author: | Joe Beaver [ Tue Dec 06, 2016 8:34 pm ] |
| Post subject: | Re: Powered Dish Sander |
That is a great machine Good job |
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| Author: | unkabob [ Tue Dec 06, 2016 8:40 pm ] |
| Post subject: | Re: Powered Dish Sander |
I like your caster support system, simple but practical. Bob
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| Author: | Pmaj7 [ Tue Dec 06, 2016 8:41 pm ] |
| Post subject: | Re: Powered Dish Sander |
Like it. Creative! |
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| Author: | Joe Beaver [ Tue Dec 06, 2016 8:50 pm ] |
| Post subject: | Re: Powered Dish Sander |
That is a great machine Good job |
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| Author: | fingerstyle1978 [ Wed Dec 07, 2016 1:04 am ] |
| Post subject: | Re: Powered Dish Sander |
Nice work. Do you have a list of the parts on EBay? I want to build one of these. Sent from my iPhone using Tapatalk |
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| Author: | doncaparker [ Wed Dec 07, 2016 6:54 am ] |
| Post subject: | Re: Powered Dish Sander |
I have a slightly different design, and mine works well, but you have given me some upgrade ideas. Thanks! |
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| Author: | kencierp [ Wed Dec 07, 2016 7:57 am ] |
| Post subject: | Re: Powered Dish Sander |
Dust control? |
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| Author: | bcombs510 [ Wed Dec 07, 2016 9:16 am ] |
| Post subject: | Re: Powered Dish Sander |
This has given me an idea. My wife has an industrial pottery wheel that has been gathering dust for long enough! Thanks! |
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| Author: | Colin North [ Wed Dec 07, 2016 9:54 am ] |
| Post subject: | Re: Powered Dish Sander |
Wish I had the space, even for a vertical. 
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| Author: | Bryan Bear [ Wed Dec 07, 2016 10:47 am ] |
| Post subject: | Re: Powered Dish Sander |
I never would have thought of using casters! |
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| Author: | Don Williams [ Wed Dec 07, 2016 10:50 am ] |
| Post subject: | Re: Powered Dish Sander |
Yeah... the casters are a nice idea... at first I had to laugh over the simple practicality of it. They will align nicely as the wheel is turning. Pretty darn clever! |
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| Author: | rlrhett [ Wed Dec 07, 2016 12:39 pm ] |
| Post subject: | Re: Powered Dish Sander |
I like it, but I don't understand the gear mechanism. Can you show a picture of the underside of the dish? Sent from my iPhone using Tapatalk |
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| Author: | Tim L [ Wed Dec 07, 2016 1:15 pm ] |
| Post subject: | Re: Powered Dish Sander |
Think its being driven by the offset pin. Nice simple design. Wish I had he room for something like that |
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| Author: | doncaparker [ Wed Dec 07, 2016 1:28 pm ] |
| Post subject: | Re: Powered Dish Sander |
Mike could explain in detail, since he built it, but it looks like the choice of the sprocket on top is just a matter of convenience, because it is round and flat and it fits securely on the end of a drive shaft. The teeth on the sprocket don't do anything. There is an offset pin on the outer edge of the face of the sprocket, and that pin inserted into an offset hole in the bottom of the dish provides rotational movement. Is that right, Mike? Like Tim said, that's a simple and effective design. I do something similar with a pulley instead of a sprocket, but I like the sprocket idea better. I also like the idea of having the drive shaft fit up into a centered hole in the dish; it helps keep the movement of the dish strictly rotational. I have been using two equidistant offset pins in my pulley, and it can shimmy around a little too much. Mike's way is better. |
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| Author: | J De Rocher [ Wed Dec 07, 2016 2:56 pm ] |
| Post subject: | Re: Powered Dish Sander |
Who else wants to see an action video? |
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| Author: | doncaparker [ Wed Dec 07, 2016 3:49 pm ] |
| Post subject: | Re: Powered Dish Sander |
I think seeing such a video without the dish on top would explain how it works better than having the dish in place. We'll see the sprocket rotating, and the offset pin spinning in a circle. But it would also be cool to hear how the casters sound with the dish in place. I bet they are pretty quiet, compared to the noisy Lazy Susan I currently use. |
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| Author: | Mike Franks [ Wed Dec 07, 2016 6:32 pm ] |
| Post subject: | Re: Powered Dish Sander |
Thanks to all who have commented on my dish sander. I will try to address some of your questions. After contemplating the design for some time, I purchased all of the components on eBay, at one sitting. The mechanical components are as follows: Marathon/Bison Gearmotor, parallel 3/4" output shaft with keyway. 1/4 HP, 110/220vac, 27.82:1 ratio with 62 RPM output at 238 inch/pounds torque Lovejoy Flexible Coupling, 3/4" X 3/4" keyed 3/4" I.D. Flange Bearing 3/4" X 12" Keyed shaft 7" X 1/4" flanged sprocket (8) Ball Bearing Casters Foot Switch I was fortunate to find the gearmotor new in the box for about $250. The 62 RPM speed is perfect and allows good control of the workpiece. I was uncertain of the ideal rotational speed but considered that manual sanding at 1 rev per second was that speed that I worked at. Don is correct in that I chose a sprocket because that is what was handy for the drive plate. The steel is soft enough (apart from the teeth) to drill and tap for the 1/4" drive pin which I made from a cut off bolt. The table top is 3/4" plywood and I made it large enough to catch the sanding dust. I thought about dust collection but the dust when sanding is not airborne and is easy to vacuum off of the top of the machine after sanding, much like I did when manually sanding. I screwed a 3/4" thick plywood backing plate to each of my radius dishes and drilled the center hole at 3/4" with the 1/4" drive pin hole. I used the actual drive plate as a drill guide after locating the center of the disc. The casters are self-aligning, very quiet and work very well. The soft rubber tires are kind to the disc. I pre-cut all of the wood frame pieces and used carriage bolts to assemble. I probably over-built the frame but it is solid as a rock. I took a quick look on eBay and there is a good selection of 1/4 HP gearmotors to choose from. Many of them are rated for 90 VDC but I see a few that are similar to mine. I'm not quite sure of how to upload a video but will give it a try if it would be of help to anyone considering building a dish sander. Best, Mike Franks www.mjfranksguitars.com www.facebook.com/mjfranksguitars |
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| Author: | surveyor [ Fri Dec 09, 2016 10:19 am ] |
| Post subject: | Re: Powered Dish Sander |
I get tired of "driving the bus" too. I'm thinking about how I could modify a used washing machine. |
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| Author: | Colin North [ Fri Dec 09, 2016 11:22 am ] |
| Post subject: | Re: Powered Dish Sander |
You must have bigger washing machines in the States, no way could I get even a parlour into mine 
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| Author: | kencierp [ Fri Dec 09, 2016 11:58 am ] |
| Post subject: | Re: Powered Dish Sander |
I am unable to find the link, but the simplest power rim contour sander set up I ever saw, used a 1/2" variable speed drill with a small sanding drum (2"?) in the chuck. The drum rubbed against the turn table (two layers of MDF) with a center bearing. Instead of casters, the thrust bearings were pieces of Teflon fastened to the base. All kind of like the old phonograph record turn table worked. |
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| Author: | Alex Kleon [ Fri Dec 09, 2016 12:55 pm ] |
| Post subject: | Re: Powered Dish Sander |
Colin North wrote: You must have bigger washing machines in the States, no way could I get even a parlour into mine Happy hour must start early on Fridays, Colin! Alex |
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| Author: | Bryan Bear [ Fri Dec 09, 2016 4:04 pm ] |
| Post subject: | Re: Powered Dish Sander |
Alex Kleon wrote: Colin North wrote: You must have bigger washing machines in the States, no way could I get even a parlour into mine Happy hour must start early on Fridays, Colin! Alex No kidding! Obviously you have to put it in there without the neck attached.  I use the wringer to thickness my plates too. I just run billets through until they are smashed down thin enough but sometimes my arm gets tired (especially if I start with 4/4 stock). |
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| Author: | Colin North [ Fri Dec 09, 2016 4:24 pm ] |
| Post subject: | Re: Powered Dish Sander |
Alex Kleon wrote: Colin North wrote: You must have bigger washing machines in the States, no way could I get even a parlour into mine Happy hour must start early on Fridays, Colin! Alex Cheers! 
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