2016-10-03 (M) Power Drill to Belt Sander Conversion

I mentioned earlier that I needed to be better about sketching the big picture about my ideas before I start on details. Chronologically the pictures today are out of order. The first thing to get sketched was the detail of parts. It wasn't until this journal was written that I finaly drew the whole device assembled.

Enough background.

For several days on the Clockwork Theremin it was apparent that the sanding was tedious and time-consuming. It would take a week of journals just describing the labors involved with sanding all the teeth. This would be dull from my perspective and for the reader. Granted, I can listen to audio books while I work but it doesn't make for interesting reading.

Meticulous sanding does leave a lot of time for reflection and speculation. Plans for building a belt sander were experimented with. Purchasing a belt sander for one job seemed silly since it would take up room the rest of the year. Plus, benchtop belt sanders don't always grant much space behind the sanding platform which would be important for getting between gear teeth. Portable belt sanders might be narrow enough but they're prohibitively expensive and not stocked locally.

Numerous designs were mentally built. Existing parts, like threaded rod, sanding belts and ball bearings, were often integral since a purely 3D printed version would not be very rugged. The design that was ultimately developed has been sketched below. This design uses two pulleys at the 45º corners and a driven pulley at the perpendicular vertex. A power drill will drive the pulley so a new motor will be necessary.

The arms of the sander will each be a pair of threaded rods so they will be adjustable for changing belts. They can also be adjusted, or exchanged, to make a right triangle with unequal sides. This could make a sander that is more like a a hand sander with a long strip of exposed sand paper.

Two threaded rods, shown in blue, at the bottom can be attached to a bench vice or a platform with the drill so it will not spin while the drill is powered. It should easy to remove the drill.

Color-coded sketch of belt sander

Detailed sketches of each part were made. These details will be necessary for modeling in OpenSCAD. This is the equivalent of psuedo-coding when it comes to parametric modeling. As mentioned, these parts were sketched before the whole device drawing was made. All the parts fit in the mental model and were revised on paper.

All the sketches were made of one half of the sanding converter, each part will be mirrored for the other side.

The rest of the posts for this project have been arranged by date.

First time here?

Completed projects from year 1.

Completed projects from year 2.

Completed projects from year 3.

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2016-09-20 (Tu)