Another New Antweight..

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EpicentrE
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Re: Another New Antweight..

Post by EpicentrE » Thu Jan 16, 2014 7:54 pm

I'm sure someone can correct me, but to my knowledge there's no difference in 2.4ghz systems. Because of how 2.4ghz works there's no risk whatsoever of interference and therefore regulations splitting the two classes aren't required. Are you sure your other receiver is DSM2, and not just DSM?
Scott Fyfe-Jamieson, Captain of Epic Robotics. Champion of AWS38/41/42.
http://www.epicrobotics.co.uk

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peterwaller
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Re: Another New Antweight..

Post by peterwaller » Thu Jan 16, 2014 8:30 pm

As I understand it the two are not compatible due to the difference in frame rates.
I think the basic DSM2 part is probably the same but the ground unit have a faster frame rate which is possible because they are limited to 3 channels.
With air systems the frame time is about 22 ms allowing upto 10 channels but the ground systems run at about 11ms on three channel and and 5.5ms on two channel giving faster response to changes of stick position.

EpicentrE
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Re: Another New Antweight..

Post by EpicentrE » Thu Jan 16, 2014 8:50 pm

You're a font of knowledge Peter, and I apologise for my misinformation above. Most interesting.
Scott Fyfe-Jamieson, Captain of Epic Robotics. Champion of AWS38/41/42.
http://www.epicrobotics.co.uk

Rapidrory
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Re: Another New Antweight..

Post by Rapidrory » Thu Jan 16, 2014 9:00 pm

Well the two I've got are

http://www.hobbyking.com/hobbyking/stor ... eiver.html

and

http://www.hobbyking.com/hobbyking/stor ... eiver.html

They do say ground and air, and that they only work with ground or air transmitters respectively...

Shame about that; the 3 channel one was the more expensive and better fitting... at least i know why it doesn't work now, Cheers peter :)
Rory Mangles - Team Nuts

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NanoTwo Motor Controllers: https://nutsandbots.co.uk/product/nanotwodualesc

Rapidrory
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Re: Another New Antweight..

Post by Rapidrory » Fri Jan 17, 2014 6:14 pm

Ok, so word of warning: http://www.hobbyking.com/hobbyking/stor ... _0_12.html do not make good weapon servos... Tried to flip something heavy with one in my flipper, and stripped the gears instantly... the servo's now pretty much useless... woo.

So... back to hunting the internet for suitable servos... :-?
Rory Mangles - Team Nuts

Robots: Nuts 2 and many more...

NanoTwo Motor Controllers: https://nutsandbots.co.uk/product/nanotwodualesc

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peterwaller
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Re: Another New Antweight..

Post by peterwaller » Fri Jan 17, 2014 7:58 pm

I have had some success with this servo.
http://www.hobbyking.com/hobbyking/stor ... duct=29628
While only being 1.8kgcm as opposed to 3kgcm it is all metal gear and I have them in one of my drive all day flippers and the one with pincers.
Image
Image
At £3.54 they are good value and they are in stock in the UK hobbyking warehouse.

Rapidrory
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Re: Another New Antweight..

Post by Rapidrory » Fri Jan 17, 2014 8:55 pm

I've stuck a http://www.hobbyking.com/hobbyking/stor ... Servo.html in there, which is the servo from Tinny.. It works fine for the moment, and has UK stock so if I can't find one with better spec, i'll get another one of these to use...
Rory Mangles - Team Nuts

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NanoTwo Motor Controllers: https://nutsandbots.co.uk/product/nanotwodualesc

Rapidrory
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Re: Another New Antweight..

Post by Rapidrory » Wed Feb 12, 2014 11:08 pm

Ok, so I'm having a few issues with flipper linkages; I've tried all manner of different combinations, and I'm struggling to get enough travel for the robot to self right, whilst still having enough power to flip anything properly... I've tried 3 bar and 4 bar linkages, and none of them have had enough travel really.

This is the setup I have atm:

Image

And this is it at full extension:

Image

It will just about self right if it is at the right angle and with some fancy flipper work, but the linkage is rather complicated and it won't close properly... Should be better when i get my proper ESC installed so there's less cables in the way, but even so it's still not ideal. Don't know about it's flipping power, as it's just a mock up with paper clips so they'll bend if i put too much load through it, but it seemed to have a reasonable amount... Any ideas for a better set up?
Rory Mangles - Team Nuts

Robots: Nuts 2 and many more...

NanoTwo Motor Controllers: https://nutsandbots.co.uk/product/nanotwodualesc

EpicentrE
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Re: Another New Antweight..

Post by EpicentrE » Wed Feb 12, 2014 11:23 pm

Rory,

what I often do if I'm having trouble self-righting is put some "horns" on the top of the machine so it holds itself further off the ground when upside down, meaning you need less travel in order to self-right.

I'd definitely wait until you've got some proper materials (not paper clips) before making a final judgment, but my experience with sliding-bar flippers, such as your design here, has been less than stellar. The most common and most successful flipper linkages are designed like the bottom two images on this page. This kind of design also gives you a lot of flexibility as you can easily move the hinge points around to find the perfect balance of travel, speed, and power. Gary describes it very well on the page linked above

Best of luck :).
Scott Fyfe-Jamieson, Captain of Epic Robotics. Champion of AWS38/41/42.
http://www.epicrobotics.co.uk

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Re: Another New Antweight..

Post by Andrew_Hibberd » Thu Feb 13, 2014 12:00 am

I can only add that with the linkage method on Garys page the servo horn can be extended to give even more flexibility on the linkage travel.

You can use a compass on paper or a cad sketch to find the designed angles and lengths.
TEAM GEEK!

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