Search found 81 matches

by sciencecat42
November 27th, 2019, 10:18 am
Forum: Mousetrap Vehicle B
Topic: Wheels
Replies: 6
Views: 438

Re: Wheels

Last year when this was a C event I found that 3D printing and balloons worked well enough. Never had any issues with skidding as the acceleration is never large enough.
by sciencecat42
November 21st, 2019, 6:34 pm
Forum: Gravity Vehicle C
Topic: Gravity Vehicle C
Replies: 209
Views: 14922

Re: Gravity Vehicle C

a.) Many teams will make an insert to fit between the rod and bearing to get a "interference fit". I always 3D printed a thin insert, but you could certainly do it other ways. How do you print the thin insert? My threaded rod is about 4.9mm in diameter and the bearing has a 5mm inner diameter. But ...
by sciencecat42
November 21st, 2019, 6:15 pm
Forum: Gravity Vehicle C
Topic: Gravity Vehicle C
Replies: 209
Views: 14922

Re: Gravity Vehicle C

a.) Many teams will make an insert to fit between the rod and bearing to get a "interference fit". I always 3D printed a thin insert, but you could certainly do it other ways. How do you print the thin insert? My threaded rod is about 4.9mm in diameter and the bearing has a 5mm inner diameter. But ...
by sciencecat42
November 17th, 2019, 4:34 pm
Forum: Gravity Vehicle C
Topic: Gravity Vehicle C
Replies: 209
Views: 14922

Re: Gravity Vehicle C

To resurrect the chain on page 15; I've found it easiest to just have the wingnut lock and determine the approximate length of the skid for each distance during practice on a bare concrete floor, and then run the vehicle off of that for the first competition run. For the second run, I adjust for th...
by sciencecat42
April 10th, 2019, 9:34 pm
Forum: Boomilever B/C
Topic: Balsa Wood Grain
Replies: 7
Views: 1098

Re: Balsa Wood Grain

Sorry I'm a bit confused about your post. Did you end up using C grain or A grain? And how much does the grain actually matter? I tried making a design with 1/4x1/8 balsa sticks today and it barely held any sand before the whole compression structure began to bow upwards. I did put the 1/4" end ver...
by sciencecat42
April 10th, 2019, 7:56 pm
Forum: Mousetrap Vehicle C
Topic: Braking System
Replies: 27
Views: 2261

Re: Braking System

When we used a two sided wingnut, it would get caught and stop the car even on the way forward. How do you implement it so that it doesn't? How do you securely attach the rubber stopper on only one side of your dowel? I do not recommend using a dowel because it is wood and it will wear and shrink a...
by sciencecat42
April 10th, 2019, 7:53 pm
Forum: Boomilever B/C
Topic: Balsa Wood Grain
Replies: 7
Views: 1098

Re: Balsa Wood Grain

Sorry I'm a bit confused about your post. Did you end up using C grain or A grain? And how much does the grain actually matter? I tried making a design with 1/4x1/8 balsa sticks today and it barely held any sand before the whole compression structure began to bow upwards. I did put the 1/4" end vert...
by sciencecat42
April 10th, 2019, 12:55 pm
Forum: Boomilever B/C
Topic: PICTURES, SCORES, VIDEOS!!
Replies: 189
Views: 29268

Re: PICTURES, SCORES, VIDEOS!!

Just to clarify, when you guys mention box beam/compression box, do you basically mean 4 main compression sticks but connected with bracing? Box beam refers to hollow compression members. Compression box refers to 4 main compression members, aka the tower chimney. Ah I see. Does box beam mean using...
by sciencecat42
April 10th, 2019, 11:37 am
Forum: Boomilever B/C
Topic: PICTURES, SCORES, VIDEOS!!
Replies: 189
Views: 29268

Re: PICTURES, SCORES, VIDEOS!!

Just to clarify, when you guys mention box beam/compression box, do you basically mean 4 main compression sticks but connected with bracing?
by sciencecat42
April 10th, 2019, 9:55 am
Forum: Mousetrap Vehicle C
Topic: Braking System
Replies: 27
Views: 2261

Re: Braking System

You don't need to saw off one side of the wing nut. When it flips over you just need something to stop it on the way back from its starting point. Think of it this way ... 8 meters forward and between 1 and 6 meters back depending upon Regional, State, or National Rules. You can just vary your star...

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