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### Course: Physics archive>Unit 10

Lesson 9: Projectile launcher

# Update and modify your ping pong ball launcher

We upgrade our ping pong ball launcher to make it safer, more accurate and more reliable. Created by Karl Wendt.

## Want to join the conversation?

• What if you had two stop pins (you could add rubber to reduce wear) and put them slightly less than the balls diameter apart so the ball will sit on them with enough below the pins to be hit by the bar? You could even have a whole row of holes to allow adjustment for different ball sizes. Additionally above the pins you could have two rails that are exactly the balls diameter apart for it to run along (or inbetween) to keep it strait.
• I think that if you add rubber to the stop you will affect the range accuracy, unless the bat is swinging through and allowing the ball to flex and spring off of the bat before the bat comes into contact with the stop. That way the energy has been transferred before the bat starts to brake. In that case, I would use two rubber closet cushions that you can place equidistant from the pivot. The one on the right will be above the bat, and the one on the left will be below. You want to counter the momentum from the spring side of the bat as well.
• Would the ping-pong balls travel farther if the nut connecting the spring is tighter?
• if you the spring is tighter there would be more resistance keeping launching distance shorter or the same.
• What is this program he is using to draw the module of the luncher to make modifications ?
• Couldn't you connect the bolt mentioned at with the other bolt that holds the top part in some way? I haven't made this launcher, but I watched all three videos on it.
• can we launch the ball on left front and right direction
• How would you launch the ball using all the holes after you install the cover? I am talking about the holes underneath the cover specifically.
• The holes are up to the end of the cover, remember the cover is only covering the spring and left side of the aluminium so the holes aren't affected
• So.. was the difficult that ball could more focus on the target into the shot?