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by Procheta Mallik

Introduction

Mount a spoke bent in the shape of a square wave inside a 1 litre plastic bottle, such that the two ends rotate. Attach a straw to one of the crests, create a circular motion on the spoke which will lead to linear motion on the straw.

    • Exercise caution while handling scissors/cutters.

  1. Make diametrically opposite holes about two-thirds of the way up the bottle Make diametrically opposite holes about two-thirds of the way up the bottle
    • Make diametrically opposite holes about two-thirds of the way up the bottle

  2. Insert scissors into one of the holes and make a cut along the length of the bottle The length of the cut should not be less than 15 cm. The length of the cut should not be less than 15 cm.
    • Insert scissors into one of the holes and make a cut along the length of the bottle

    • The length of the cut should not be less than 15 cm.

  3. Bend the  wire 4 cm from one of the ends. This is the first bend. All the bends should be 90 degrees and should lie on a single plane. All the bends should be 90 degrees and should lie on a single plane.
    • Bend the wire 4 cm from one of the ends. This is the first bend.

    • All the bends should be 90 degrees and should lie on a single plane.

  4. The second bend in the wire should be approximately 2 cm away from the first bend. Make sure the ends of the wire are are in opposite directions after making the second bend Make sure the ends of the wire are are in opposite directions after making the second bend
    • The second bend in the wire should be approximately 2 cm away from the first bend.

    • Make sure the ends of the wire are are in opposite directions after making the second bend

  5. Make the third bend at a distance of 1cm from the previous bend All the bends should lie in the same plane.
    • Make the third bend at a distance of 1cm from the previous bend

    • All the bends should lie in the same plane.

  6. Now at a distance of 2 cm from the preceding bend, bend the wire once again to form a U - shape. Now at a distance of 2 cm from the preceding bend, bend the wire once again to form a U - shape. Now at a distance of 2 cm from the preceding bend, bend the wire once again to form a U - shape.
    • Now at a distance of 2 cm from the preceding bend, bend the wire once again to form a U - shape.

  7. Make another bend in the wire 4 cm away from the previous bend. Make another bend in the wire 4 cm away from the previous bend. Make another bend in the wire 4 cm away from the previous bend.
    • Make another bend in the wire 4 cm away from the previous bend.

  8. Make the last bend at a distance of 3 cm from the preceding bend. This is your handle. Make the last bend at a distance of 3 cm from the preceding bend. This is your handle.
    • Make the last bend at a distance of 3 cm from the preceding bend. This is your handle.

  9. Insert the wire through the straw about 2 cm from one end of the straw Make sure the straw is placed within the U - shape of the handle.
    • Insert the wire through the straw about 2 cm from one end of the straw

    • Make sure the straw is placed within the U - shape of the handle.

  10. Insert the handle and straw through the cut slit of the bottle The straw should come out through the cap end of the bottle The straw should come out through the cap end of the bottle
    • Insert the handle and straw through the cut slit of the bottle

    • The straw should come out through the cap end of the bottle

  11. Make hole in the centre of the cap with diameter more than that of the straw. Put the cap on the bottle and let the straw come out through the hole. Put the cap on the bottle and let the straw come out through the hole.
    • Make hole in the centre of the cap with diameter more than that of the straw.

    • Put the cap on the bottle and let the straw come out through the hole.

  12. Start rotating the handle and observe the translation of motion from the rotational motion of the handle to the linear motion of the straw. Stick any figure or object at the end of the straw. Enjoy! Stick any figure or object at the end of the straw. Enjoy!
    • Start rotating the handle and observe the translation of motion from the rotational motion of the handle to the linear motion of the straw.

    • Stick any figure or object at the end of the straw. Enjoy!

  13. Not able to  insert or take out the wire and straw into/from the bottle. Slit made from one side is too short.
    • Not able to insert or take out the wire and straw into/from the bottle. Slit made from one side is too short.

    • Handle coming out or falling down through the slit. Stick tape on two sides of the handle inserted through the hole.

    • If the bends are too long, compared to the radius of the bottle, the crank may not rotate in the bottle freely.

    • What type of motion conversion is taking place in the crank?

    • Can you think of applications for this kind of translation of motion?

    • Is it possible to convert the straight/linear motion into circular/rotational motion also? Have you come across any machine(s) in daily life which work on such a principle?

    • Instead of rotating handle with hand, attach a fan to the handle. Blow on the fan to rotate the handle.

Finish Line

Suhail Ahanger

Member since: 05/02/2017

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