Make disc sander

How to make a drill powered disc sander

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.

Drill hole for 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.


Install the shaft with bearings

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.

Join the sanding disc to the shaft with bearings

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.

Cut protruding threaded 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.

Front disc with hole and recess

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.

Sanding with the disc sander

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 😀


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5 comments on "Homemade disc sander"

  1. Hello friend, the video is very good as always, but I would like to make two comments to you, 1º.- I put Velcro bands on the sandpaper plate, starting with a central one and sticking them towards the edges and it has to be the velcro face that is Opposite to that of purchased sandpaper (I think it is the hook one), of course the diameter has to be the same as the commercial sandpaper sheets. 2º.- and to the axis that goes inside the mandrel, I made 3 chamfers so that it locks inside it (I think that with one it would be enough, but I also think that it offsets the axis and would cause vibrations). I hope my comments serve you for something and they are understandable, I do not send you a photo because I do not know how to do it here. A hug and continue with the videos are very understandable and practical. I congratulate you as always on your channel.

    1. Enredando No Garaxe

      Thank you very much Oscar. Stencil glue works well for me, and I have no major problem removing the old sandpaper and putting on a new one. The part of the threaded rod that goes inside the chuck of the drill is true that it gives me a bit of a problem, and it is that with the thread of the rod the chuck does not tighten it as well as I would like, and it deforms the bagel. But hey, it's not too much of a problem. The thing to do the chamfers ..., as you say could de-center the axis. For now I'll leave it as is 🙂 Greetings

  2. Francisco Fernandez Quijano 3

    By other means, I sent him this same comment: many of his projects, I have carried them out successfully and all thanks to his indications; now I need to convert a grinder into a table sander, do you have a video about it? Yes, please, kindly provide it to me… Thank you

    1. Enredando No Garaxe

      Hello Francisco. Thanks for watching my videos and stopping by my carpentry blog. Well no, at the moment I did not make any homemade machine with the grinder. Greetings 😀

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