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Hi all this is going to be my first build, I've spent countless hours reading build alongs and various posts. so happy to finally start putting stuff together! Just planning on building a moving board at the moment just to make sure it all works correctly.
Suggestions welcome, as I'm sure there will be many questions :)
Looks good so far, lots of familiar parts there!
Any ideas what type of bot you want it to be in the end?
Cheers, Yeah stuck with what everyone else is using in beetles, I'm hoping to build a drum spinner I think depends on access to tools at the moment though. So final designs have not been decided, could turn out completely different to my original idea lol
I like the tie wraps :) If I've given the world anything, it's the art of tie wrapping motors lol.
Yeah it will do for the moment, can't see it being a long term thing :)
if you have counter sunk the motors into the sidewalls then just drill through and bolt the motors straight to the sides, thats what alot of builders do also what sort of drum are you planning on building as there are a whole world of options for them
Yeah I counter sunk the motors into the side wall, but the side was had a bit of flex in it so I just strapped the motors to the base. It's only temporary anyway until I decide on a final design. I'm thinking of doing something like 720 with regards to a drum full width spinner. That does depend on my ability to access the equipment needed though.
Nowt wrong with a bit of flex in the bulkhead especially with foam wheels. Fat lip was running for over a year until the motors finally finally broke. They were given a bit of encouragement to break too courtesy of orbit ripping the front off and ripping them apart with a spinner!
If you fix them securely in place they take all the shock and impact.
Well if I'm honest it was a bit more than a bit of flex lol any advice on wheels? Thought I would give these hard foam wheels a go. It no idea if they will hold up or give me enough grip. Have looked at banebot wheels also. Anyone use some sort of rubber bushings for motor mounts?
Stick velcro under the motor and then tie wrap down. Will take a beating all day.
How hot do these motors get then?
Not very
Ah good I'll give that a try then :)
Finally have a moving chopping board! Lol banebots wheels have arrived also. Can't upload photos or video from my iPhone though :(
Managed to get it running on single stick but I've noticed when I'm pushing the stick forward the left motor is engaging before the right and it doing the opposite in reverse. If anyone could help me it would be much appreciated as this whole thing is new to me.
I am not an experienced roboteer - but the following is based off my observations with Big Dave 3. I expect somebody else will have a better idea!
That sounds like a (very) dodgy mix on the controller, or probably more a speed controller that's got different behaviour in forward/reverse. Big Dave 3's speed controllers do not have the same top speed in reverse as in forwards, and if one of your controllers is running backwards when the other is running forwards this could happen. I've seen this before when motors are mounted "upside down", the speed controller reversed to cater for it, and suddenly things don't behave how you'd expect.
On Big Dave 3, we had to reverse a motor's polarity, as opposed to reversing the controller, because otherwise we ended up with this problem.
The only other thing I guess I can thank of is that it could be that the speed controllers aren't centred in the same place.
This is one of these things that without seeing/knowing all the control gear and its configuration I can't really comment much further. That said, you probably want to make sure your ESC pairs think they are going in the same direction with stick forwards. So undo any channel reversing (if you've applied any) and if you robot goes in circles at this point, you need to swap the wires on one of the motors with each other (since you're using standard DC motors).
I hope that helps.
Ah hands for commenting you've give me a few things to look into and fingers crossed I can sort it out. I think I did switch one to revers to get it to go forward. I'll post a picture of the instructions I followed for the handset I have also.
APPENDIX AHow to setup Elevon Mixing for a Combat Robot
Setting up channel mixing can be frustrating. You enable mixing and plug everything in only to discover that the robot is not responding correctly: it backs up when you command a turn and spins to the left when you try to go forward. Where do you go from there?
This appendix describes a step-by-step process to get your differential steer robot responding correctly to a transmitter Elevon (Delta Wing) mix. This generic process places steering and throttle control on the right stick of a Mode 2 transmitter. For other stick assignments, consult the Team Run Amok Transmitter Programming Guide.
- Consult your radio manual and enable Elevon mixing on your transmitter. If your motor controller (ESC) has its own on-board mixing, disable it.
- If applicable for your radio, set both Aileron and Elevator response to 100%.
- Plug the left side motor controller into the channel 1 (Aileron) receiver port.
- Plug the right side motor controller into the channel 2 (Elevator) receiver port.
Throttle Test: power up the robot and push the right stick forward a little (forward throttle command).
- If the robot moves forward, good! Skip down to the Turning Test.
- If the robot moves backward, select Servo Reversing from the transmitter setup and reverse both the Elevator and Aileron channels.
- If the robot spins to the right, reverse only the Elevator channel.
- If the robot spins to the left, reverse only the Aileron channel.Note: if your 'bot has multiple motors on each side of the 'bot and wheels on the same side of the robot are turning in opposite directions, reverse the motor leads to the ESC for any motor(s) spinning the wrong direction.
Turning Test: move the right stick a little to the right (spin right command):
- If the robot spins right, your basic setup is complete.
- If the robot spins left, swap your motor controller plugs (left into Elevator, right into Aileron) and repeat the Throttle Test with ‘left’ and ‘right’ corrections reversed.
Turning response will likely be too sensitive for combat. See the sections on Dual Rates, Throttle Volume, and Exponential Response in the main section of this guide to adjust control sensitivity.
One wheel engaging before the other just sounds like your trims are out a little. Move the slider (or click button) below the stick on the aileron axle left or right in small increments until both motors/wheels turn at the same time. Bear in mind that some motors aren't neutrally timed too, so will spin faster in one direction than the other. Since motors are generally fitted back-to-back or opposite to each other, this can affect the straight line ability of your robot and can be cancelled out by sensitive adjustment on the transmitter stick when driving, but most of the time it's not severe enough to be a problem.
It sounds like trims are out or your motors aren't neutrally timed (in which case adjust trim to suit).
Thanks both, fingers crossed I'll get it sorted. Must be able to fix it as the motors and ESC's are ones that are commonly used in beetleweights.
Been a while since I've posted, progress has been slow! Managed to get a bit more progress over the last few days, fingers crossed ill be able to attend an event this year.
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no idea why they have all come out sideways mind :(