2014-06-14 (Sa) ESPeri.Impass

Another build of mine was featured on Hack a Day! The tennis ball launcher was put up as a build for HackADay's 2014-06-14 posts. I am pleased.

This afternoon it also became a featured project on Instructables. Double pleased.

Enough background.

Supplies were gathered. The smaller applicator bottle nozzle was chosen since it is the least preferable and mistakes ban be made on it. The original intention was to put a a sharpened bolt into the nozzle which would be capped but capping the nozzle would be difficult so a short brass screw was put into the tip of the nozzle with the idea that it could rest on a flat surface, such as a bolt, to provide a low friction point to spin on. The tip of the screw protruded far enough into the nozzle that a #4 bolt could fit inside the nozzle and contact the tip of the brass bolt but the clearance to the I.D. of the nozzle was low enough that the screw tip would not slide off accidentally.

 Gathered supplies

 A #4 screw to be inserted into the nozzle

#4 screw in the nozzle

The screw protruding into the nozzle

 The animation make it a little easier to see where the screw tip ends up

To demonstrate the low friction between the screw and the bolt white pressure sensitive labels were applied to the black nozzle rim. Short photo bursts were made with the camera phone while the spinner was freely spun.

The pressure sensitive labels on the nozzle

 Spinning slowly

Spinning vigorously

A #12 brass finishing washer was modified with a  cut-off wheel on a rotary tool The purpose was to have a metal tab sticking out at only the angle of interest. The outer rim of the washer was weakened by the cut-off wheel then torn away. The jagged edges were smooth with the cut-off wheel. The modified washer was attached to a #6 threaded nylon rod and held in place by two #6 brass nuts, a #6 brass finishing washer, and a #6 flat nylon washer. The purpose of the #6 finishing washer was to use the shape of it to center the larger #12 washer.

 A rotary tool cut-off wheel and the #12 brass finishing washer

Initial cuts on the washer

Tearing the scrap metal away

The tabbed washer with smoothed edges

The tabbed washer in place on the #6 threaded rod

A #4 wood screw was inserted into the north side of the spinner but only a short distance. The purpose is to have the metal on the the spinner and the metal on the shaft collide in the angle of interest and give a different sensation than when plastic collides. A second screw was inserted on the south side to act as a counterbalance and therefore not inserted as so it will not collide with the inner washer. No extensive testing has been done. Identical neodymium magnets were glued in place with hot glue.

The magnetized spinner with a #4 bolt in the north side

Bottom view of spinner on the shaft

Counterbalanced spinner

To do:

  • Test + Evaluate
  • Redesign
  • Rebuild
  • Repeat

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

A list showing of all the final posts of COMPLETED projects.

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