Learn wood­work­ing skills, ba­sic elec­tron­ics and solder­ing as you build a ma­chine that draws on its own us­ing mark­ers and vi­bra­tion.

Popular Mechanics (South Africa) - - SHOP NOTES - DE­SIGNED BY JAMES SCHADEWALD

Use a 890 mm hole­saw in a drill to cut out two wood discs (Fig. A) from the 25 mm x 150 mm cedar.

Draw a cen­tred 60 mm cir­cle on each disc with a com­pass. This will help you align the holes for the mark­ers.

Sand the edges of the cut discs smooth us­ing 120-grit sand­pa­per.

Us­ing a mitre or jig­saw and miter box, cross-cut the scrap block to 40 mm long. Spread wood glue on the end-grain of the block, cen­tre be­tween the two discs, and clamp to­gether to dry (Fig. B).

On the top disc, make six equidis­tant marks on the perime­ter of the 60 mm cir­cle you drew. Space the marks about 330-400 mm apart but there’s no need to be ex­act. Use a drill with a 5,2 mm twist drill bit to make a hole on each mark, pass­ing the bit through the up­per and lower discs.

Sol­der the leads from the vi­brat­ing mo­tor to the bat­tery holder. Glue the bat­tery holder and mo­tor to the up­per disc with hot glue (Fig. C).

In­stall the bat­tery, then slip a piece of pa­per be­tween the bat­tery and the con­tacts to break the con­nec­tion.

In­sert coloured mark­ers in the holes and hold them in place by loop­ing two rub­ber bands around them (Fig W D). Re­move the pa­per from un­der the bat­tery holder and set the bot down on a piece of pa­per to cre­ate your mas­ter­piece.





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