Mouse trap car

About: Mostly a programmer and random computer guy, but lượt thích to mess with hardware & other real life objects sometimes. More About LarrySDonald »

One of my sons friends stayed over yesterday và mentioned in passing he"d been assigned to lớn make a mouse trap oto for school. I thought about how I had lots of fun making those way back & decided lớn make one out of scraps off my desk and document it. It"s far from the best one ever & unlikely to lớn win any awards, but it does work.

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I used the following:A mouse trap4 eye hooks6 balloons2 bic pens (the smooth kind)2 tops from pop cans (for the serious perhaps washers, or otherwise any other bendable metal)some string (not pictured)4 CDs/DVDs (expendable ones). Here 3 CDRs & a blank transparent thing from the vị trí cao nhất of a spindle. I hear DVDs are a bit lighter, but I"m not optimizing that hard.



Cut the top và bottom off on two of the balloons. Stretch them over two of the CDs, which will later be the back wheels. This will help traction a great deal as CDs are otherwise pretty slippery.


Assure yourself that the eye hooks fit over the pens. They need lớn be loose enough lớn rotate easily, but not so loose that they rattle too much. If not, bend them slightly so that they do. Mine were a bit small và needed khổng lồ be bent out a bit.


Make a hole roughly in the center of one of the pens. I did this simply by screwing one of the eye hooks in & ten removing it. It needs to be large enough to lớn take the string.

Push the string into the pen and get it out one of the sides. I pushed it in and blew on one end, then jammed then ink part I"d removed earlier in, cussed at it a bit and then did it some more. Eventually, when the string is through the pen, tie something lớn the other end. This one is with a small piece of a toothpick. A simple knot would probably vì in most cases, but my thread was a bit thin. Pull it back through và make sure the knot/object stops against the other side of the hole.

Screw the four eyelets into the mouse trap along the short sides. Try khổng lồ get them lớn be roughly the same depth so that the axle that will later go through them is somewhat straight. Also, take care lớn not crack the trap too much. More ambitious builders may want to pre-drill holes, but I went for broke và indeed it cracked a bit, but not so much that it didn"t work.

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Insert the front axle (i.e. Then pen without the hole/string) pushing it through both pop tabs (or whatever you"ve managed to lớn get). Pinch them khổng lồ the pen so that they won"t move too much & keep the pen from moving sideways. Bend them away from the eyelets enough so that they can spin freely against it & give them some leeway from it (not snugly pressed against it). Make sure it can rotate ok.

Wrap a balloon around the pen you just put in, trying to fold it so that it"s somewhat wedge-like toward the edge of the pen. Gently rotate one of the CDs without balloons on them onto it in the same direction you wrapped the balloon, wedging it on the pen. Attempt to get it to point fairly straight và not wobbly in relation khổng lồ the trap. Repeat for the other over of the pen.

Push the pen with the string into the back eyelets. Pull the string through the eyelets so that it"s between them (or slide through the gap if you had khổng lồ widen them). Tie the string to lớn the tip of the flap that will move as the trap springs. Those more ambitious might want lớn brace it with something between the spring and the back to make sure it doesn"t snag or fray, but I didn"t bother, which does mean the string gets tangled or frays every so often.

Gently turn the back wheels backwards (if your unsure of the direction, put it on a surface and pull it backwards). When it starts to catch, lift the flap slightly & keep turning until the trap is starting to lớn load. Keep going until it"s pulled all the way back, then hitch it as one normally would setting a mouse trap (see instructions on package I guess).Take a bit of care, because if the string snaps the trap will indeed close (quickly) & anything you have in the way will get hit. It"s not exactly deadly, but not pleasant either - these things vày pack enough power to lớn make you go "Ouch".

Tap the trigger và watch it go. Readjust the wheels (which are a bit flimsy with the low-rent balloon support) lớn get them straighter và retry. It"s not very crash resistant, not very pretty, but very easy lớn make & can, if you"re me, be built entirely out of things you can reach from your work chair (yes, that included having an old pack of mouse traps on my shelf).

Have you tested the mousetrap oto without balloons around the wheels & if you have does the balloon help the car to go farther?

Yes. The way it"s geared here, the rear wheels will spin out and it"ll go almost nowhere. If the floor has much better grip, it might work ok without them. It might also work if it was geared differently, such as having a narrower read axle, so that it doesn"t deliver as much torque lớn the rear wheels và starts out more gently.