Toy Inventor’s Notebook: Ballpoint Penball!

Toy Inventor’s Notebook: Ballpoint Penball!




They are ubiquitous: these clicking ballpoint pens. Uncover them at the lender, the doctor’s office environment, or almost any spot wherever varieties and signatures are necessary. Go get a freebie pen and make this fun bagatelle: the Ballpoint Penball activity!

Make It

Illustrated by Bob Knetzger

For the ball launcher, use the ink cartridge as the plunger, the button as the suggestion, and the compression spring for the launching power. Reassemble the areas as revealed, and discard the little cam and the barrel (over and beneath). The cap holds issues together, and you will use the clip to enable mount it to the activity.

Photo by Bob Knetzger

Make the activity areas from styrene sheet adhering to the downloadable template. To lower the parts, rating the plastic along a straightedge with the knife, then bend it backward. It will snap cleanly along the scored line. Lower out the playfield and a good deal of rail strips.

Photo by Bob Knetzger

Photo by Bob Knetzger

Lay out the rail pattern on to the playfield with light pencil traces. Maintain a rail piece in posture, mark the length necessary, then rating and snap.

Photo by Bob Knetzger

Maintain the trimmed rail piece back again in spot and, making use of the solvent bottle, use a drop of MEK directly to the joint. The MEK will stream along the seam. Cautiously continue to maintain the rail in posture though the solvent bond hardens in just a few seconds.

Photo by Bob Knetzger

Maintain including rails as you go. The corner joints will supply energy. Examine the spacing among the rails to be certain your marble rolls by way of freely.

Photo by Bob Knetzger

Past, incorporate the stand on the back again to give the playfield an angle.

Photo by Bob Knetzger

To mount the launcher, glue the pen clip to a piece of styrene strip. Drill a tiny 1/8″ hole in the base rail so the ink cartridge can move by way of — but not the spring.

Photo by Bob Knetzger

Slide the launcher assembly into posture, then transfer it down just plenty of so that the spring is slightly preloaded and however leaving a good deal of travel for launching. When you have identified the greatest posture, solvent bond the cross piece to the rails. When the bond has fully established, check-fire the launcher. If necessary, split the launcher totally free, reposition, and re-glue. By meticulously pulling down on the ink cart “plunger” you really should be equipped to regulate the shooting power and goal the marble into many tracks at the leading, just like a actual pinball activity.

Photo by Bob Knetzger

Make the 4 MAKE target sleds from lightweight chipboard. Trim and examine: they really should slide simply down the playfield tracks when pushed downhill by the rolling marble.

Photo by Bob Knetzger

Photo by Bob Knetzger

Let us Play

Established all the targets at the leading of their tracks and load the marble. For a basic one particular-participant activity attempt to rating all 4 targets with the fewest range of pictures — a excellent activity is just 4 balls. Or, up the rigidity and play versus time: How swiftly can you rating them all? For a two-participant activity, get turns shooting, but goal only for your targets (one particular participant is “vowels,” the other is “consonants,” variety of like stripes and solids in pool). Make up your have activity variants, much too!

Photo by Bob Knetzger






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