RogueTwo Robots

[RogueTwoRobots]

Re: RogueTwo Robots

Ah of course. Now you've said that, I remember seeing some data logs (I think for 360's brushless) showing the low continuous current consumption after the initial spin-up period.
The drum spins much more freely now that I've gone back to needle roller bearings, but I'll make a point of lubing them regularly nonetheless.

[RogueTwoRobots]

Re: RogueTwo Robots

Quick Update

The belt for the drum arrived today from Technobots, and it's a perfect fit. No tensioners required!
Just gave it a quick spin-up and I'm happy and impressed with the brushless configuration. The drum could be a problem though.

Despite appearing to be balanced when spun by hand, it starts to vibrate and bounce considerably when the throttle goes past about 20%. I reckon this is the same issue of dynamic imbalance that Calum experienced on his drum that just had two teeth offset at 180°.
I had hoped it wouldn't be too much of an issue having three teeth at 120° intervals but seems that's not the case.

Worst case scenario, I can run it at the champs and just ramp up the throttle when I'm about to hit an opponent, but I think it's worth seeing if I can get another tooth made and add it to the drum in the same arrangement as the old drum, so: V---^---^---V

Back out to weld the armour back together, but will have some pictures and possibly a video later.

[Mouldy]

Re: RogueTwo Robots

Had a feeling you'd have that problem... Get a video

[typhoon_driver]

Re: RogueTwo Robots

You will need to get a new drum made I think

[RogueTwoRobots]

Re: RogueTwo Robots

Yeah, either a new drum or possibly a beater.
Will save it for after the champs though. Don't have the inclination to rush something beforehand, or the cash for that matter.

[typhoon_driver]

Re: RogueTwo Robots

The other way of trying to get around it would be to weld on the inside a weight opposite the tooth. Then it will be statically and dynamically balanced. The weight would only have to weigh roughly what the extra material on the ring weighs.

Even if you can't get one welded in the center tooth of the drum, two on the outside teeth would stop the bot from wobbling sideways as the imbalance would be in the center of the drum only. The bot would bob up and down instead of side to side.

[typhoon_driver]

Re: RogueTwo Robots

O and I would initially do a small tack weld to hold the weights in place. Spin it up again and check it all out. Then if it doesn't work, a large chisel and hammer and some brute force should remove the weight.

[typhoon_driver]

Re: RogueTwo Robots

Actually it could be welded on the outside, just to the side of the ring. Although it wouldn't be as neat. It obvious I'm thinking on the spot here?!?

[RogueTwoRobots]

Re: RogueTwo Robots

Haha, just a bit. I've actually been thinking along the same lines as you though. I can't weld anything to the inside since the endcaps are welded in place, but I'm thinking that welding on some chunks of metal on the outside is worth a shout. Looks aren't important so no worries there

Glad I've got the robots ready quite early this year, leaves plenty of time to faff around with things like this!

[PJ-27]

Re: RogueTwo Robots

Do you need your Ali drum back? Haha.

Hope you get it sorted, Drumroll deserves a decent shot, especially with all the upgrades.

[RogueTwoRobots]

Re: RogueTwo Robots

Yeah I'll take that ali drum now that you've fitted those lovely teeth to it!

Not got a whole lot left to do to Drumroll now. As mentioned earlier the belt for the drum arrived, along with some fuses for the lipo, and it fitted in nice and snug:



Most of the day was spent re-doing the armour, which hadn't been properly fixed since NST had its way with it. Not sure what it weighs but it now wraps around the robot as a single piece, rather than two separate side pieces. Need to go over a few of the welds to beef them up, but ran out of welding rods:



I was going to re-fit the wedge as well but, as much as I love how it completes the look of the robot, I'm thinking about just ditching it. I reckon it won't be that effective and will more likely get bent and impede the drive.

So currently it looks like this:



It's also had new tyre screwed onto the wheels as the old stuff was a bit flat and not particularly grippy. I can also switch them round with the Banebots hybrids you can see in the background, should I feel they offer better grip or just want snazzier colours.

Still need to fit the fuse, fit some new power distribution bolts, try and balance the drum and then paint it. Maybe a couple of days work overall.

Still got a couple of things to finish up on Carcinus too, but it's pretty much ready to go. Re-did the paint on the claws, although I've taken the easy way out and just made the claws static. With my dad's driving, it's one less thing for him to worry about



Plan for tomorrow is to start on the MDF bot, although if there's time, I'll take Drumroll down to the industrial estate for a test.

[Gabe01]

Re: RogueTwo Robots

Both looking excellent, does Carcinus drive funny, diagonal wheels ? , get those pincers working for your Dad

[RogueTwoRobots]

Re: RogueTwo Robots

Thanks. Yeah the wheels in Carcinus are set 120° apart and the idea is that the robot is able to strafe i.e. it can go diagonally and sideways. There's supposed to be a third wheel at the back to complete the setup but I've been having trouble trying to find a wheel that's slippy enough to be pulled along when the robot is moving forward/back, but grippy enough to turn the back end when needed.

The robot is also front-heavy due to the claws so there's not much weight pushing down on the back wheel, which doesn't help matters. But I've got a homemade wheel idea in mind that I'll try and see how it goes

Regarding the claws, I think I've actually made the robot a little compact to fit an effective enough actuation mechanism into. Either that or I need to consider more compact custom options. But the drive uses three channels so I think my dad would struggle to cope with having four channels to operate!

[Gabe01]

Re: RogueTwo Robots

How about a wheel modelled on the back wheels of Razer, rolly bits

[RogueTwoRobots]

Re: RogueTwo Robots

I did have a look at omni-wheels, but the only commercial one with a 125mm diameter had rollers that looked like quite a hard plastic, and I didn't want to get it shipped from Australia if it wasn't going to work. I'd probably need a custom-made omni-wheel but there's too much faffing about involved in making one when there's no guarantee that it would definitely do the job.

Will play about with a few different tread materials and see what produces some decent results.