Re: pic: Bit Buckets 2015 Prototype Drive Pod
 

Neat drive module. I like the single reduction, very simple. What sort of fasteners are you using to tie everything together?

Does a 4'x8' CNC plasma cutter count? Each of these parts took 4-5 minutes of cut time (1/4in 6061 T6), and that long cut time is due to the dozens of pierces for the lightening pattern.

http://i.imgur.com/QCryxlE.jpg

https://www.youtube.com/watch?v=2HHVwJ_C31M

The side-panels took less than 2 min each to cut from 0.032 5052 Al.

http://i.imgur.com/gU6AhRa.jpg

Or a 4'x4' CNC router? All of these parts together took about 17min of cut time, most of which was in the pocketing.

http://i.imgur.com/FgtZxiL.jpg

Re: pic: Bit Buckets 2015 Prototype Drive Pod
 

Exactly what wood are you burning with your laser. I say exactly because I have access to a 160 watt laser and have tried cutting 1/4 Baltic birch and if it will cut depends on where I get it.
Some cuts real nice and some will only seem to cut to the glue line then just starts burning. So, if you have any details on what you are using it would be appreciated.
Thanks

Re: pic: Bit Buckets 2015 Prototype Drive Pod
 

I think a killough actually has a root2 speed up.

Re: pic: Bit Buckets 2015 Prototype Drive Pod
 

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

Re: pic: Bit Buckets 2015 Prototype Drive Pod
 

Some plywoods have glues or fillers that don't cut well, which would explain it. 160W is otherwise overkill for 1/4" plywood.

Re: pic: Bit Buckets 2015 Prototype Drive Pod
 

Yes it will cut an inch of pine but not some plywoods.

Re: pic: Bit Buckets 2015 Prototype Drive Pod
 

Likely true. I'll look into it today.

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

Re: pic: Bit Buckets 2015 Prototype Drive Pod
 

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.

Re: pic: Bit Buckets 2015 Prototype Drive Pod
 

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.

Re: pic: Bit Buckets 2015 Prototype Drive Pod
 

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. :rolleyes:

Re: pic: Bit Buckets 2015 Prototype Drive Pod
 

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.

Re: pic: Bit Buckets 2015 Prototype Drive Pod
 

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.

Re: pic: Bit Buckets 2015 Prototype Drive Pod
 

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 .