Jrdrag's Tracked Rover

Unless you’re really hooked on having see-through sides, I would strongly recommend you ditch the plexi and get some decent plastic, like Delrin. Its more expensive, but it will never shatter, and its about 100 times easier to work with…

You can drill it, machine it, tap it, cut it, file it, whatever. I tend to cut larger sheets to size on my table saw.

http://www.huv.com/MicroRaptor-Chassis-small.jpg

huv.com/MicroRaptor-Chassis.jpg

(click for a big version)

That’s a picture of the chassis for MicroRaptor that I just machined over the weekend. Its cut (on a CNC mill) from 1/4" Delrin.

  • Jon

True that.

yeah, that’s true, I’ve workes with plexi-class a couple of times and it shatered all the time, gets frustating :frowning:

And the cutting tools to score and break the glass are very innaffective unless you have the patience to score it 50 million times so the cut is deep enough to break. Even so, it can only be done for cutting out small pieces of straight edge acrylic. :confused:

For now the plexi will do, but I’d definately like to be able to change the material. What would be the cheapest place to pick up some derlin?

McMaster charges ~$45 for a 24"x24" sheet of 1/8" black derlin.

I wasted too much plexi, just trying to get a general shape cut out. My jig saw kept cracking everything, up until I got the finest tooth blade I could find. Definately not worth the effort, but it will work for now.

I have never had plexi crack on me with my table saw non-ferrous metals blade, it really works!

depends on the thickness though. Is he using 1/8" or 1/4"?

Working with plexiglass is an art. I used to build sumps and overflows for salt water tanks and still use a 3 foot long acrylic sump that uses 1/2", 1/4" and 1/8" acrylic. I cut allt he pieces by snapping them. A couple scores was all it took. It broke alot of pieces when I stated working with it though.

It takes patience and practice to get good at it. I don’t think it’s a great building material for robots unless they are small or the plexi is very thick.

What kind of tank do you run? I have a 54 gallon planted discus tank with a fluval canister filter. It’s my “happy place”. :laughing:

I have a 120 gallon reef tank, 40 gallon sump, 2 seaclone 150 protein skimmers, assorted soft corals and leathers with a Maroon Clown, Bubbletip anemones and some gobbies.

I also have a 75 gallon reef, 33 gallon sump, Euroreef skimmer, assorted corals and some puffers.

Sorry this is horribly off topic. :slight_smile:

Sweet setups. I’d like to eventually do a larger tank, but I’m content with my 54 corner for now. I don’t think I’ll ever do a reef - too much equipment. I think a massive planted freshwater community tank would be a lot of fun to watch, and it would be very low maintenance.

Sorry for the mini-hijack. :blush:

no worries 8)

That’s where I got all my delrin. The price seems reasonable to me… but I’m not exactly looking for pennies in the sofa cushions. 8)

I buy mine from a local place - theplasticstore.com/

For you Canadian Toronto-area guys, they sell Delrin in just about any size you want, for reasonable prices…

Shipping is pricey, but you can pick it up for free.

  • Jon

I have used 1/4" and 1/8" with good results in plexi.

The 1/8" hopefully will hold up fine for me, atleast for a bit. I just wish I could find time to work on this with school! :imp:

I feel your pain, lets lobby for 4 day weekends.

…does that count for wheeled / non-TRACKED vehicles too? In the same situation i mean…Like if JRDRAG’s motor units were running wheels instead of tracks…

…Man i HATE being a noob again :smiley:

While at Ikea today with my mom, I saw some drawer dividers that I could not pass up getting. They will be used for my main chassis. I’m going to create a box using them. Though the thickness of the aluminum is very thin, I cannot flex the pieces with my hands. Not bad for $12, I got a couple of pieces. Camera phone pics again :blush:
http://i172.photobucket.com/albums/w6/jbflix/0121081744.jpg
http://i172.photobucket.com/albums/w6/jbflix/0121081744a.jpg