Mousetrap Vehicle C

[rafaelnadal]

is this kit any decent: https://www.docfizzix.com/products/vehi ... 75df.shtml


i'm probably not gonna have all my parts in time for the next contest, so I'm looking for a kit i can use to start off. Plus, it's my first time doing a build, so I feel like it's easier to build something on your own, after you've had a kit to know what the build is supposed to be like.

also how does a wheel hub work.

sorry if i sound dumb haha

Thnx

[PM2017]

is this kit any decent: https://www.docfizzix.com/products/vehi ... 75df.shtml


i'm probably not gonna have all my parts in time for the next contest, so I'm looking for a kit i can use to start off. Plus, it's my first time doing a build, so I feel like it's easier to build something on your own, after you've had a kit to know what the build is supposed to be like.

also how does a wheel hub work.

sorry if i sound dumb haha

Thnx

Firstly, you really don't need to apologize for not knowing something. Learning is the point of these forums.

As for your first question, I won't be able to give a good answer, however, I can tell you that within ten days of ordering all pieces, they have arrived.

As for your second question, let's assume you have a 1/8 in threaded rod, and you are using a wheel with a bore ( the hole where the axle goes through) that is 1/2 in wide. In order to attach the wheel and rod in such a way that they do not spin independently, you would use a hub that has a bore of 1/8 in, and that has an outer diameter of 1/2 in. You would attach the hub to the inside of the bore of the wheel, and then the rod into the hub. Essentially the hub turns the larger hole into a smaller hole.
(The sizes of the rod and bore don't have to be the ones I mentioned, just sizes where the threaded rod is smaller than the bore.)

Hope I helped!

[rafaelnadal]

is this kit any decent: https://www.docfizzix.com/products/vehi ... 75df.shtml


i'm probably not gonna have all my parts in time for the next contest, so I'm looking for a kit i can use to start off. Plus, it's my first time doing a build, so I feel like it's easier to build something on your own, after you've had a kit to know what the build is supposed to be like.

also how does a wheel hub work.

sorry if i sound dumb haha

Thnx

Firstly, you really don't need to apologize for not knowing something. Learning is the point of these forums.

As for your first question, I won't be able to give a good answer, however, I can tell you that within ten days of ordering all pieces, they have arrived.

As for your second question, let's assume you have a 1/8 in threaded rod, and you are using a wheel with a bore ( the hole where the axle goes through) that is 1/2 in wide. In order to attach the wheel and rod in such a way that they do not spin independently, you would use a hub that has a bore of 1/8 in, and that has an outer diameter of 1/2 in. You would attach the hub to the inside of the bore of the wheel, and then the rod into the hub. Essentially the hub turns the larger hole into a smaller hole.
(The sizes of the rod and bore don't have to be the ones I mentioned, just sizes where the threaded rod is smaller than the bore.)

Hope I helped!

Thanks ! The wheel hub part makes total sense now. So If I am buying banebot 2 7/8" wheels, can i buy a hub on their website? or is there another place I can get a better hub from?


As for the kit, It's not more so I won't have the parts, it's that I won't be able to put the carbon fiber together, since I need my friend's 3D printer for the joints, and I won't be able to use it until he gets back after the contest, so I'm trying to find a cheap kit I can use to understand what a reversible mousetrap build looks like, it's components, and how to put the parts together.

If anyone can recommend a reasonably priced kit for starters, that'd be awesome.

As for parts:, mousetraps, frame, lever arm, wire, 2 axles (threaded?), 4 wheels, 4 hubs, 4 steel ball bearings, wingnut + threaded rod. Am I missing anything? Thanks.

Now for a stream of questions ( I feel like I'm almost asking how to build the vehicle .-.):

How exactly would i design the joints for the carbon fiber that I am planning to 3D print?

How do I attach the lever arm (carbon fiber square tube) to the mousetrap?

Additionally, how would I attach the wheel/axles or the mousetrap to the carbon fiber? Most designs I have seen have had holes drilled into the wood. (You can't rly do that with CF can you xD?)

What are the optimal lengths from the frame of the car? Any opinions/general lengths?

[DarthBuilder]

Did you use that kit bc I bought the same exact one lol. I think home made is better just bc you have to modify the kit already. Also the kit is not very fast, in fact it is pretty slow.

[JasperKota]

How exactly would i design the joints for the carbon fiber that I am planning to 3D print?

How do I attach the lever arm (carbon fiber square tube) to the mousetrap?

Additionally, how would I attach the wheel/axles or the mousetrap to the carbon fiber? Most designs I have seen have had holes drilled into the wood. (You can't rly do that with CF can you xD?)

What are the optimal lengths from the frame of the car? Any opinions/general lengths?

If you look at cuber's prototype at the bottom of page 4 on this thread, it looks like they designed slots their basswood sticks could go through in their 3d printed parts (you could do the same with carbon fiber sticks), and that they designed holes their axles/bearings/bushings could go through.

For the lever arm I've seen designs where they take zipties and secure the lever to the metal thing that flips over of two mousetraps.

[rafaelnadal]

How exactly would i design the joints for the carbon fiber that I am planning to 3D print?

How do I attach the lever arm (carbon fiber square tube) to the mousetrap?

Additionally, how would I attach the wheel/axles or the mousetrap to the carbon fiber? Most designs I have seen have had holes drilled into the wood. (You can't rly do that with CF can you xD?)

What are the optimal lengths from the frame of the car? Any opinions/general lengths?

If you look at cuber's prototype at the bottom of page 4 on this thread, it looks like they designed slots their basswood sticks could go through in their 3d printed parts (you could do the same with carbon fiber sticks), and that they designed holes their axles/bearings/bushings could go through.

For the lever arm I've seen designs where they take zipties and secure the lever to the metal thing that flips over of two mousetraps.

Ohhh so that's what the gray parts are for.

Ok i think i've mostly figured everything out except I can't find where to get a good hub for my banebot 2 7/8"s . The hubs on the banebot website are weird...

[retired1]

Not weird once you understand them. The hub can be bought in a number of axle sizes.The hub uses an allen wrench to tighten the grub/set screw to the axle. The hex shape portion fits into a hex cutout in the wheel. The no fun part is that it uses external snap rings to lock the wheel to the hub. It takes special pliers for most people to do it. The wheel is trapped between a flange on the hub and the snap ring.
Note that each series of wheels has a dedicated hub.

[retired1]

The doc fizzix wheel is a lot lighter than the wheel that you asked about. It uses what I believe is a rubber grommet that the axle is a tight fit and the OD has a slot that fits the CD. You can find the correct size on line, but it will be a pain for most.
Balloons will be a must to become the tread of the tire to reduce skids/ slipping. A 1 t0 1.5 inch section will work well.

You will want to use all thread for the braking axle but you can use brass tubing of the proper size for a much lighter other axle.
For the all thread, see if you can find 7075 aluminum that has been heat treated.

[rafaelnadal]

Not weird once you understand them. The hub can be bought in a number of axle sizes.The hub uses an allen wrench to tighten the grub/set screw to the axle. The hex shape portion fits into a hex cutout in the wheel. The no fun part is that it uses external snap rings to lock the wheel to the hub. It takes special pliers for most people to do it. The wheel is trapped between a flange on the hub and the snap ring.
Note that each series of wheels has a dedicated hub.

Oh yeah i figured out out thnx

luckily i have the right set of pliers for them too, its just i need to make the shaft size match the size of my axle.

[Aristotle]

What type of times have people been getting for their practice runs? I've been getting around combined 8 seconds after pushing the cup and going maximum distance back (4 meters behind SP). Any thoughts on what scores to expect at invitationals?