10" Disc Sander

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Hello, this is my first project that I'm posting here, hope you like it. It's all welded with a HH140 running flux core wire.  pic 1) 3/4 hp. motor and its mount, the platen and the stand/feet.  pic 2) feet and supports Attached ImagesL-Tec PCM-VPi II Hobart Handler140Millermatic 35Lincoln Power arc 4000Lincoln Ranger 10,000 ( 3 ) Longevity Tigweld 160SX Purox O/A setup100lb anvilXLO/servosource cnc mill
Reply:cool project how are you gonna mount the sanding disc to the motor?Adam MMorales Ranch
Reply:I have to lay out a 10" diameter circle on a piece of 1/4" steel plate and also machine a hub that ( 3 or 4)screws go into the disc and has 2 set screws to lock onto the motor shaft. In the pics thats all the farther that my progress is. as I progress I will add more pictures.L-Tec PCM-VPi II Hobart Handler140Millermatic 35Lincoln Power arc 4000Lincoln Ranger 10,000 ( 3 ) Longevity Tigweld 160SX Purox O/A setup100lb anvilXLO/servosource cnc mill
Reply:Nice project.  If I were building this I wouldn't mount a 10" disc directly to the motor, I would think that there might be to much pressure if your pushing hard towards the edge of the disc.  I haven't used a 10" disc sander but I would think you would also be able to bog down or slow down the motor if you are using it on a big peice, which wouldn't be good for the motor.  I would mount the 10" disc to a shaft about a foot long and use 2 bearing assemblies to mount the disc part.  And then use a belt and pulley set up for the motor to the shaft.  This would also allow you to change the size of the pulleys to get different speeds at the 10" disc.  Hopefully this makes sense, I just don't think that mounting the disc right to the motor shaft would be good for the motor bearings.
Reply:You  might have a hard time getting the disk to run true/flat..... unless you turn an arbor with a  5 or 6" diameter hub that you could bolt the flat plate to.....hope this helps some,mike
Reply:Thanks for the ideas Ponch and Mikee. I will definitely look at doing that. I was simply basing mine off of one that my previous employer (Penn United) had quite a few of, it was a baldor 1/2 horsepower motor with a 10" disc. for deburring tube/ other workpieces.L-Tec PCM-VPi II Hobart Handler140Millermatic 35Lincoln Power arc 4000Lincoln Ranger 10,000 ( 3 ) Longevity Tigweld 160SX Purox O/A setup100lb anvilXLO/servosource cnc mill
Reply:I did some searching after I posted and most of the store boughten ones do have the disc mounted right to the motor.  Must be an ok design if that's how they sell them but to me this would create a lot of pressure on the shaft bearing in the motor. You can get some pillow bearings pretty cheap, I would weld a 3/4" round stock 12" long onto the back of the disc plate and put a bearing about 1" back and then one on the other end of the round.  Then you can mount a pulley on the shaft, the advantage to this would be that you can easily change rpms of the disc.  I'm sure your idea will work just fine being that's how the boughten ones are but I usually like to over engineer everything!Please provide lots of pics, this is a usefull tool and I would like to build one someday.
Reply:Running the disc right off the motor shaft should be just fine. There isn't that much moment on the shaft. And the 1/4" plate disc will flex taking out a lot of it.Here is a fellow that built his own disc sander:http://www.cnccookbook.com/CCDiscSander.htmLooks good so far!-Jim
Reply:wow, that link is great Jim, thankyou                  - JeffL-Tec PCM-VPi II Hobart Handler140Millermatic 35Lincoln Power arc 4000Lincoln Ranger 10,000 ( 3 ) Longevity Tigweld 160SX Purox O/A setup100lb anvilXLO/servosource cnc mill