unnamed drum spinner

[Max]

Hi,
i've decided to start this build diary as i have finnaly got together all my parts for my drum spinner. Here are the specs.
drive motors: 2 argos 12v drill motors
weapon motor: 1 speed 900 on 24v
weapon: 1.2kg stainless steel spinning drum
ESC: sabertooth 2x25
wheels: 100mm blue wheels
armour: 20mm hdpe armour and bulkheads (i know nylon would have been better) and an ali base plate and lid
batteries 2 12v nicads in series to give me 24v

i think thats everything pictures will follow very soon !

[Max]

Re: unnamed drum spinner

some pics!
[attachment=2:1m1ros8k]robot_stufff_and_hampton_court_035.JPG[/attachment:1m1ros8k]
[attachment=1:1m1ros8k]robot_stufff_and_hampton_court_036.JPG[/attachment:1m1ros8k]
[attachment=0:1m1ros8k]robot_stufff_and_hampton_court_037.JPG[/attachment:1m1ros8k]

[Max]

Re: unnamed drum spinner

more pics!
[attachment=2:15oqhp17]robot_stufff_and_hampton_court_038.JPG[/attachment:15oqhp17]
[attachment=1:15oqhp17]robot_stufff_and_hampton_court_041.JPG[/attachment:15oqhp17]

[ewan]

Re: unnamed drum spinner

Very nice. Are you just using o-rings for weapon belts though? You'd probably be better off with timing belts & pulleys, o-rings are almost definitely going to jump on pulleys with flanges that small (and lose traction)

[Max]

Re: unnamed drum spinner

At the moment I will just use 2 o-ring belts and will see how it goes and it is supposed to slip a bit to protect the motor but may upgrade to 1 timing belt if it proves ineffective

[mattsdragons]

Re: unnamed drum spinner

Looks good, I'll have to build one eventually

[Max]

Re: unnamed drum spinner

forgot to mention, everything in the first picture together ways 12kg but that doesn't include motor mounts, screws and bolts for holding everything together or the large bolts for holding the bearings in place so weight might be tight!

[PJ-27]

Re: unnamed drum spinner

It's very disheartening when you weigh your components and they alone are near the limit!

[typhoon_driver]

Re: unnamed drum spinner

Got a decent set of components there for a drum bot. How is the drum constructed? Trying to work it out but it's difficult from the pictures. Have you taken a sheet of stainless and bent it around?

[ewan]

Re: unnamed drum spinner

You could potentially save a lot of weight with li-po. And can't quite see from the picture but you mightn't need that much HDPE?

[Max]

Re: unnamed drum spinner

The drum is just a piece of 2mm thick stainless steel tube with ends welded up and axels put on. The 'teeth' are made by cuttings arks out of a larger tube which are then bolted on.
To save weight I could invest in some lipos and some of the Ali is getting cut away for the wheels and to make space for the drum. If worst comes to worst I could drill large holes in some of the bits of hdpe which are just there for support and don't act as armour. Finally I could downgrade to 2mm Ali baseplate and lid (would help with ground clearance) or see if i can find some cheap titanium. Or I could get a brushless motor to power it

[jonny]

Re: unnamed drum spinner

looking great!

[Max]

Re: unnamed drum spinner

some more pics!
[attachment=1:1jym2jk5]robot_stage_2_001.JPG[/attachment:1jym2jk5]
[attachment=0:1jym2jk5]robot_stage_2_004.JPG[/attachment:1jym2jk5]
i've now finished making the motor mounts and i've melted in some nuts to use to bolt on the bearings. unfortunaty i've put the nuts in the wrong place so now it is more cramped and i'll have to replace the two bit of hdpe at the front with either 3mm ali or 2mm steel (prefferably) depending on weight. apart from that everything is going well
and don't worry about it all looking wonky thats just my photo taking skills

[Max]

Re: unnamed drum spinner

Hi, I am going to buy timing pulleys from tecnobots, what gear ratio should I get for a 1.2 kg drum from a speed 900?

[Max]

Re: unnamed drum spinner

Also, is the name invictus taken?