Boys and Girls...

New Zealand Listener, Volume 1, Issue 9, 25 August 1939, Page 27

Boys and Girls...

This corner, all you young folks, is for you and your interests. This is where we tell you, week by week, about what is being put over the air for you, just. as the grown-ups have their own pages with their own programmes. So make sure that you, too, " Look .Before You Listen."

HOW TO MAKE AN ELECTRIC MOTOR — Mostly From Odds and Ends

PART I. me how you have been able to follow all the building details that have been given from time to time. Our discussion on September 5 will be on the building of what is known as a permanent magnet electric motor. By the time this broadcast takes place you should have been able to gather together all the materials necessary to make it. You will also have the plan of the armature stampings and a drawing of the motor and the commutator. The following is the list of materials required to make the motor:1 magneto magnet. 2 terminals (off an old radio set will do). 1 piece of spring copper (for brushes). 1 piece of copper tubing, 5-16th-in. diam. and lin. long (for commutator). 1 piece of brass tubing 3-16th-in, diam. and 2in. long (for bearings). 1 piece of steel rod Yin. diameter and 6in. long (for axle). 1 piece of ebonite rod %4in. diameter and lin. long (for commutator). 1 piece of ebonite panel from an old wireless set (for commutator and brush stand). reel of 28 gauge enamelled copper wire (for winding armature). piece of steel %4 x 34 x 2in. dozen small wood screws. baseboard, 6 x 3 x lin. (wood). dozen flat tobacco tins (to cut armature stampings from). Small piece of strong hoop iron or heavy tin (for bearing holders and holding magnet in place). Some tissue paper (for insulation). Shellac and methylated spirits. Small nails (for riveting the armature stampings together). Below is a pattern of the armature stampings. Glue the pattern to a strong piece of cardboard and cut out along the a lines. I have left in the lines show7 has often both worried and puzzled ~ Nee

(By " Modelmaker," who will broadcast from 1YA on September 5) ing how I drew the pattern in case there are some of you who would prefer to draw your own. You may not want to cut the magazine, and if so, you could trace out the pattern or even use carbon paper. After you have made your pattern on the cardboard make a tin one and use this for marking your other tins. An Yeth in. hole is bored in the centre of each one. Next week I will tell you about the commutator and the bearings.