Disc Sander

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Project by Grulgor posted 06-04-2020 06:35 AM 879 views 4 times favorited 9 comments Add to Favorites Watch

New machine ready for my workshop: homemade disc sander.
It features a tiltable table (45-90°) which can be unmounted in seconds to change the sandpaper. A dust extraction system can be mounted. It has a fixed speed mode (1400 rpm) and a manual mode where the speed can me set manually from 0-1400rpm. The t-track will be added as soon as I have it available. This will allow me to mount a miter gauge or other jigs.

9 comments so far

View Redoak49's profile


4746 posts in 2765 days

#1 posted 06-04-2020 10:27 AM

Excellent job…A really good looking and functional sander.

View Jim Jakosh's profile

Jim Jakosh

24800 posts in 3882 days

#2 posted 06-04-2020 12:02 PM

That is a real beauty of a sander. I like you design and how you can snap off the front to change the sanding disc! Very nice work building it.

Cheers, Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View BigAl98's profile


229 posts in 3815 days

#3 posted 06-04-2020 12:19 PM

The wood part looks excellent…the electrical…welllll..I don’t know. Can you elucidate the numerous wires on the back? It would seem to me, that you’d have only 1 romex NM wire (14/2) to the motor (115 VAC?) the var speed control in a separate box not pictured box? Also, how did you source the platten (metal circular disc) for mounting the sand paper and the motor. And the toggle switches?

-- Al,Midwest -To thine own self be true

View Grulgor's profile


54 posts in 639 days

#4 posted 06-04-2020 12:49 PM

Hahaha, you’re right. I still have to tidy up the electrical part and make a back part for the electrical compartment.
Here is the video of the sander running.

It is actually a very unique piece of motor, it is a 600W motor driven by a controller powered by a 48V power supply. The bearing is a ceramic bearing and it has magnetic drive. The speed can be set by analog input 0-10V and with a digital input I switch between fix speed mode (1400 rpm) and manual mode (0-1400rpm).
Maybe you noticed the hole next to the ON/OFF switch. It was for direction change. I wrote the firmware for this motor system by myself and planned also a direction switch, but then noticed that I misscalculated the amount of available space in the electrical compartment. As direction switch is actually overkill I dropped this idea.

View Brandon's profile


4235 posts in 3728 days

#5 posted 06-04-2020 04:53 PM

That looks great! I’ve been pondering doing the same thing. How did you attach the motor to the disc piece?

-- "hold fast to that which is good"

View therealSteveN's profile


5773 posts in 1350 days

#6 posted 06-04-2020 07:46 PM

Nice build

-- Think safe, be safe

View Grulgor's profile


54 posts in 639 days

#7 posted 06-04-2020 08:07 PM

That looks great! I ve been pondering doing the same thing. How did you attach the motor to the disc piece?

- Brandon

On this motor there was a aluminium flanch where I could mount the disc solidly with four screws. But on another motor (like this) you would need to make the flanch by yourself by putting a small disk of a couple of plywood on the rod of the motor and then screwing the disc to this homemade flanch.

View Grulgor's profile


54 posts in 639 days

#8 posted 06-05-2020 06:12 AM

If someone is interested in plans for this build, I have put them together and they can be purchased here.

View Vince's profile


1260 posts in 4205 days

#9 posted 06-05-2020 03:46 PM


-- Vince

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