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I only need basic RC control. So I think I need a 4 channel remote, a four channel receiver, two motors and some servos.
If I got two motors, steering would be accomplished by one stopping, then the running motor taking over for left and right?
[...] I only need basic RC control. So I think I need a 4 channel remote, a four channel receiver, two motors and some servos. [...]
Yes I am describing a differential [...]
As for complexity both are munch the same , a skid steer will need two motors and two ESCs while using a simple diff will only need one motor one ESC and one servo for the steering ( a lot cheaper ), the steering wheel only needs to be a single unit and would be very simple to make so no need for complex steering linkage .
Another good method would be to use two motors as in a skid steer and have a front (or rear) wheel that acts like a castor , this method will greatly reduce the friction normally associated with traditional skid type steering where several wheels (or a tracks) are used on each side
Skid steering will require more motor power as it creates more friction and it uses power to do the steering as well and I still don't recommend it if you want some thing that is nice a smooth to control around on your living room floor .
This system I have described only needs one motor for drive and one servo for the steering and of course an ESC for speed control.
I refer skid steer to any thing that does not have a set of wheels that point in the direction you wish to go, it comes from many years of working around such machinery .
What I am seeing is the OP looking to make a box that is a lot longer than it is wide and putting a wheel in each corner pointing in the long direction of the box and by varying the speed of either side they cause the object to move in that direction , like some one said that is great if you wish to make a tank .
BTW Soren , you was the first to mention differential steering TYVM so why put me down for mentioning it ?
I am anticipating a dry weight of about 20 pounds or 10 kilograms, so you're saying that a skid steer system would work? What specifically would I need for that? Two motors, AC or DC?
And what's an ESC if I may ask? And you said two right? And then please forgive me, how would that be wired?
Gosh guys I never said skid steer would not work , of course it will work , I just don't see it as the best option .
Yes I know differential drive gets used a lot [...]I still don't see how what I have described could be considered complex for the OP
All that is need for a diff is an axle with one wheel fixed to the axle and the other wheel free on the axle this will allow both wheel to rotate at different speeds when going around a corner , connect a motor to the axle and there you have your drive complete with diff .
Steering only needs to be a simple (single) wheel at the front ( or the rear) connected to a servo to turn the wheel in the direction you wish to turn , there is no need to have two wheels for the steering and if the OP has plans to move K9s head and antenna with servos then he/she should be able to rig up a very simple steering of this type .
Soren as for you laptop well I guess if you like to push it around like a toy car them it would be considered to have skid steer ( I am just wonderingt that when you do this do you make brmm brmm nioses as well ) .
Terminology will always be a problem, people from different country's say things differently and have different meanings, I shudder when I here some one measuring in inches and feet witch to me are very incorrect terms in engineering .
I would also like to add some more that is a bit of topic but I feel it needs to be said , from the previous post I feel as though I was literally ganged up on and bullied buy two long term members of this forum who egos are a reflection of there membership status on this forum , I really don't care how many post you have on this forum it does not make you SOR gods.
Differential drive and differential steering are totally different things.
I Have worked in the engineering industry for over 30 years . My qualifications include welding ,metal fabrication ,machining ,electrician ,mechanical fitting and I am also currently in my 3rd year at the University of Western Sydney (that's in Australia ) doing my engineering degree with a major in mechatronics and robotics , I am on this site for the sole reason that I think I can contribute a lot to it , I like to think I know what I am talking about when I advise on something but as I am not a robot my self I do make mistakes as my knowledge is far from perfect .
Please guys let not let this forum be like so many other internet forums were you get a few individuals who think that just because they are long term members that there word is all people should listen to and then turn nasty to any one else who offers an opinion that they don't like , sadly I can see that this is starting to happen to this forum .