How to Build a Surface Sander

How to build a surface sander that is every bit as smooth on your budget as your board, including a detailed diagram and building instructions.


| March/April 1986



098-131-01

Click here to view a larger version of this diagram.


MOTHER EARTH NEWS STAFF

Build a surface sander that's every bit as smooth on your budget as it is on a board. 

Chances are, if you're only an occasional woodworker, you'll never really need a surface sander. But if you do a fair amount of woodcrafting, this 12 inch homebuilt surface sander tool will make a nice addition to your shop.

How to Build a Surface Sander

The framework is made of 16-gauge (about .070 inch), 1 inch-square tubular steel stock . . . which can be replaced with a heavier-walled material if necessary. The table is a 3 foot-long section of 3/4 inch plywood cut from a cabinet door; that 7-ply birch panel was an excellent choice because it's resistant to warp and has an extremely smooth finish. The sanding drum and feed rollers were fabricated from hardwood disks and dowels, respectively. The drum is spiral-wrapped with 1 inch aluminum oxide machinist's cloth held with adhesive, and the rollers are covered with 1-1/2 inch reinforced rubber hose sections.

To keep the surface sander design uncomplicated, the drum is powered, but the feed rollers operate manually with a hand crank. The infeed and outfeed rollers turn in unison, since they're connected with a V-belt. As you might imagine, drum sanding requires appreciable horsepower, even for a benchtop unit like this. Our sander performed satisfactorily coupled to a 1-HP, 1,750-RPM capacitor-start motor, though a split-phase type would work just as well because starting torque requirements aren't that critical. By using a 5 inch drive pulley, we were able to achieve about 3,000 RPM at the sanding drum . . . the equivalent of 3,450 surface feet of sanding per minute.

The sander's depth of cut is adjusted by raising or lowering the table, which is mounted on a bed hinged to the base to form a parallelogram. A length of threaded rod fastened between two clevis shafts on the base and table bed sets the table height. Any irregularities in the surface of the workpiece are taken up by spring-loaded pinion guides, which allow the rollers' axle shafts to rise up slightly under pressure from below.

Points in Particular

We've provided both an exploded illustration identifying the machine's parts and dimensioned plan views to aid you in putting together your own sander. Furthermore, we've gleaned a few tips from our research shop that should help you make the transition from paper to project as pleasant as possible.





mother earth news fair

MOTHER EARTH NEWS FAIR

Feb. 17-18, 2018
Belton, Texas

More than 150 workshops, great deals from more than 200 exhibitors, off-stage demos, hands-on workshops, and great food!

LEARN MORE