FAQ for "It's All in the Wrist"
Q: How do I find the period of my tubing?
A: The period is the number of times the tubing is wrapped around the PVC pipe divided by the length of the PVC pipe. We recommend using a pipe of no less than 24 inches in length. For example, if you wrapped your tubing around the PVC pipe three times and your pipe is 24 inches long, your period is 3/24.
Q: I'm having trouble wrapping the ½ inch diameter tubing around the PVC pipe in the same period as the ¼ inch diameter tubing. Is there a trick to this?
A: There is no one trick that will help you, but if you tape one end of the tubing onto the pipe it should make it easier to wrap the rest around. Once you mark where you need to cut the tubing, un-tape the one end, cut the tubing and then reattach it. Also, ask your helper to hold the pipe and tubing end while you wrap it around the pipe.
Q: My screw pump is not picking up any water when I turn it. What am I doing wrong?
A: Try readjusting your pump. It will need to be positioned in a way so that the entire opening of the tubing is underwater when you turn it. If that doesn’t help, try turning the pump the other direction.
Q: How high should the discharge bowl be raised off the table?
A: You can use any flat object you want, but the height you are aiming to reach between 1and 2 inches. A thick book or piece of wood will work fine.
If you have other questions about the procedure or need assistance troubleshooting the "It's All in the Wrist: Moving Water with the Archimedes Screw Pump" Project Idea and/or project kit, please post your question in the forum at Ask an Expert: https://www.sciencebuddies.org/science- ... m.php?f=78. Our team of volunteer Experts is available to assist. We attempt to reply to questions within 24 hours. Please note that you will need a free Ask an Expert account in order to post questions.