After trying to make a disc sander by connecting the sanding disc shaft directly to the drill chuck, and seeing that it was not a good idea, I did a shaft with bearings to put between the sanding disc and the chuck. So, in this entry we are going to see how to make a homemade disc sander powered with a drill, but using the shaft with bearings.
To make this homemade wood sander, the first thing I need to make is a new drill support. But this time, instead of a drill support, it will be more something to hold the shaft with bearings.
So I cut four strips of plywood and glued them two by two. And now, holding the two groups of two pieces together with clamps, I use a forstner bit to drill the hole for the bearings. I need to make a drill as straight and vertical as possible, so I use the drill press.
So, after screwing one of the pieces to a piece of plywood, now I can install the shaft with bearings which I hope will help to keep this wood sander stable.
The diameter of the hole I drilled is some smaller than the diameter of the bearings, so I have to put a few pieces of cardboard to adjust the position of the plywood pieces.
After checking that the shaft rotates well, and that I can fit the drill without problems, I install a first plywood disk with a little epoxy resin, washers and nuts.
I cut this album with the guide to cut circles and I drilled a hole the diameter of the threaded rod. So I could screw it on the rod.
And I cut the protruding piece of threaded rod.
Now one of the most complicated parts in making this homemade disc sander: rectify the disc. The thing is that the plywood disc will hardly be perfectly vertical to the axis of rotation. So, I put a simple wooden table in front of the disc (the same one that will serve me to work with the disc sander), and with a chisel or a gouge, and a lot of patience, I try to leave the disc flat and perpendicular to the axis of rotation. And I also rectify the back of the disk.
Once I have rectified the disc of this home sander for wood, I will glue another thinner disc on the front. This serves to hide the nut and the washer that protrude in front of the first disc. So in this second disc, I had to make a hole with the shape of the nut and a recess with the diameter of the washer.
Then, I glue the disk and I hold it with several clamps while the glue dries. For this it is better to disassemble the shaft with bearings from the support. And when the glue is dry I cover the front hole with a little wood paste and I sand it to make it smooth. Finally I rectify the edge to make the two plywood discs equal.
Now all I have to do is cut a piece of sandpaper the same size as the sanding disk, and I glue it with stencil adhesive. I put a medium grit sandpaper, since it is usually the one I use the most for sanding wood. Some of you ask me how to change the sandpaper of this DIY disc sander, and the truth is that the old sandpaper is very easy to remove, since the stencil adhesive does not leave it permanently glued. Pulling on it usually comes out almost all the sandpaper without problems. It occurs to me that maybe if I apply a little bit of heat it will come out even easier, but I didn't try it.
And I can already sand wood or plywood with this DIY disc sander.
After using it for a while, I am delighted with this homemade disc sander, since it works very well and allows me to be very precise when sanding the wood pieces.
Now i also have a sanding drum very easy to make and use. And it is that these sanders for wood greatly facilitate the work in our carpentry workshops.
Below we can see how to change the sandpaper of the homemade disc sander. And I also show you the YouTube silver button that I received a few months ago 😀