pic: Bit Buckets 2015 Prototype Drive Pod

[AdamHeard]

Originally Posted by z_beeblebrox

We're using Killough drive, so robot speed is 1/sqrt(2) wheel speed. We also like the simplicity of a single reduction gearbox.


I'm not certain; I think 60 or 75 W.

I think a killough actually has a root2 speed up.

[s_forbes]

Originally Posted by AdamHeard

I think a killough actually has a root2 speed up.

I hadn't put much thought into it, but I believe you are correct. Those modules will probably need another reduction stage.

[z_beeblebrox]

Originally Posted by s_forbes

I hadn't put much thought into it, but I believe you are correct. Those modules will probably need another reduction stage.

Likely true. I'll look into it today.

Originally Posted by Bruceb

Exactly what wood are you burning with your laser.

.25" 5-ply Baltic Birch plyood from Woodworkers Source.

[z_beeblebrox]

Version 2, ready to be cut tomorrow. Two stages of reduction, for an adjusted robot speed of ~10 fps. Adding a reduction stage only made it ~.25" longer and wider.



Our mostly complete chassis. This will also (hopefully) be cut out tomorrow.

[Dunngeon]

Originally Posted by z_beeblebrox

Version 2, ready to be cut tomorrow. Two stages of reduction, for an adjusted robot speed of ~10 fps. Adding a reduction stage only made it ~.25" longer and wider.



Our mostly complete chassis. This will also (hopefully) be cut out tomorrow.

What settings does your team use for the cut? I just realized we have a 60W 30x15 laser cutter sitting in the other room at school.

[z_beeblebrox]

Originally Posted by Dunngeon

What settings does your team use for the cut? I just realized we have a 60W 30x15 laser cutter sitting in the other room at school.

I'm not sure; the settings for our laser aren't "real" units like Watts or Inches/ second. I'd suggest you just try different settings until you find something that works. But do try it; the laser is an amazing resource to have available.

[orangemoore]

Most laser cutters are different. If you want know the setting you can figure them out. But a good starting point is the internet and research into the laser cutter you have.

[Dunngeon]

Originally Posted by z_beeblebrox

I'm not sure; the settings for our laser aren't "real" units like Watts or Inches/ second. I'd suggest you just try different settings until you find something that works. But do try it; the laser is an amazing resource to have available.

Definitely, I wasn't trying to just copy paste settings. That rarely works in my experience. I was curious about the speeds you're able to go. Although if the laser doesn't use real units that's disapointing .

[BHS_STopping]

Originally Posted by s_forbes

I hadn't put much thought into it, but I believe you are correct. Those modules will probably need another reduction stage.

I'm just taking the conservation of energy route.

Assume constant power output P. P = force * velocity (dot product used here). Since the force of the wheel along the direction of motion is effectively reduced by a factor of 1/sqrt(2), the velocity must increase by a factor of sqrt(2) to maintain that power output.