unnamed drum spinner

[robotic_ants]

Re: unnamed drum spinner

http://www.ebay.co.uk/itm/Stainless-...-/130569785908
http://www.ebay.co.uk/itm/Stainless-...-/130569786129

If your concerned about your motors, that's the kind of stuff you need. The open area of the larger one is 43% and the super fine about 32% so it will reduce cooling by that percentage but its better than blocking them off altogether. Also it's stainless steel so it's non-magnetic and won't rust like other steel and iron woven mesh.

[Ellis]

Re: unnamed drum spinner

I was thinking more along the lines of old sock, but OK!

[Max]

Re: unnamed drum spinner

Today I cut the aluminium base plate and nearly finished the last few jobs before I screw the hole thing together! Also watched Thor and ripper and their teams on epic win on BBC 1 trying to smash their way out of a caravan but it was an epic fail!!

[Max]

Re: unnamed drum spinner

Been trying to make removable link today but it doesn't want to work , nothing sticks to a deans connector!!!!

[Max]

Re: unnamed drum spinner

some pics,
my cut aluminium base plate:
[attachment=2:1rmo5dd3]robot pics stage 3 005.JPG[/attachment:1rmo5dd3]
My general layout:
[attachment=1:1rmo5dd3]robot pics stage 3 004.JPG[/attachment:1rmo5dd3]
my timming pulley on the drum:
[attachment=0:1rmo5dd3]robot pics stage 3 003.JPG[/attachment:1rmo5dd3]

[Max]

Re: unnamed drum spinner

more pics,
hinge covering my removable link:
[attachment=1:3qgk3zjb]robot pics stage 3 002.JPG[/attachment:3qgk3zjb]
My electronics mounted on a piece of hdpe
[attachment=0:3qgk3zjb]robot pics stage 3 001.JPG[/attachment:3qgk3zjb]

[Bodge Job]

Re: unnamed drum spinner

Looking good!

[RogueTwoRobots]

Re: unnamed drum spinner

They're some hefty bearings!! With the cast iron housings they weigh almost half a kilo each do they not? Suppose it's fine if weight's not a problem, but if your robot's too heavy they'll be a prime candidate for weight reduction.

Overall it's looking rather fine though. Always nice to see another drum

[Max]

Re: unnamed drum spinner

have started screwing everything together and hooked up electronics inside the robot. have just had first spin up test of the drum and it worked great! it has a fast spin up time and seems to be well ballanced. also retested the drill motors but found that one at least was flashing inside when i changed directions! i have never noticed it before so thought it was worth asking if this was normal?

[RogueTwoRobots]

Re: unnamed drum spinner

Sounds like it's going well! If you're able to get a video online of the spin-up, that would be pretty awesome
The flashing inside the drill motors tends to occur more when you change from one direction to the other at high speeds (it also occurs at low speeds, but can be less noticeable). It's just the sudden change of current that causes an electric arc. It's not an ideal life-cycle for the motor, but considering we're using them in robotics and put them through a helluva lot of abuse, they still last for quite a long time.

[Max]

Re: unnamed drum spinner

here is the video (not the best video i've watched but does the job)
http://www.youtube.com/watch?v=m74CEWU0bdQ

[jonny]

Re: unnamed drum spinner

nice!

[Max]

Re: unnamed drum spinner

They're some hefty bearings!! With the cast iron housings they weigh almost half a kilo each do they not? Suppose it's fine if weight's not a problem, but if your robot's too heavy they'll be a prime candidate for weight reduction.

Overall it's looking rather fine though. Always nice to see another drum

They are only 0.4 kg actually!

[Max]

Re: unnamed drum spinner

Did a bit more work on the robot today, all the hdpe is now screwed together and all the motors/electronics are inside. Just got to screw on base plate and put in an led then it will be ready for testing! No idea where I will test it as it has do little ground clearance (about 1mm by the look of it!) so I make have to screw/glue on some thin rubber. Also had problems with space for the wheels, basically there wasn't enough of it so had to do some modiffying. Only other problem is that only one battery fits in the robot so I don't know what I'll do about that.

[typhoon_driver]

Re: unnamed drum spinner

They are only 0.4 kg actually!

Lol my bearings weigh only a few grams a piece. I would advise that next time, have a solid stationary shaft and then have some needle roller bearings inside the drum. Makes for a stronger structure overall and means you don't have to use those large bearing blocks.

Not looking too bad at all though.