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Topic Review (Newest First)
02-16-2020 03:25 PM
dethmachinefab
Quote:
Originally Posted by 87manche View Post
a separate RX battery may alleviate brownouts from the BEC not having enough current in the ESC during full stall.

if that's the problem.

or it may just be the ESCs can't handle it.
Quote:
Originally Posted by aczlan View Post
I would start there, try first with whatever small 12v battery you can strap on the top and wire in to power the controls separately from the 24v wheel motors.

Aaron Z
I run two motor controllers, one handles drive and the other turret rotate. I tried powering the rx with the bec from the turret speed control instead of the drive speed control and got the same result. Battery voltage is not dropping much when this happens. Noise could be an issue though so I should do a 100% isolated test from another source. Bec voltage never drops, always 5v.

Oddly I had it run fine for about 10 seconds yesterday before freaking out. No idea why that happened, because it's usually a near instant failure mode.
02-16-2020 03:13 PM
aczlan
Quote:
Originally Posted by 87manche View Post
a separate RX battery may alleviate brownouts from the BEC not having enough current in the ESC during full stall.

if that's the problem.

or it may just be the ESCs can't handle it.
I would start there, try first with whatever small 12v battery you can strap on the top and wire in to power the controls separately from the 24v wheel motors.

Aaron Z
02-16-2020 11:24 AM
87manche a separate RX battery may alleviate brownouts from the BEC not having enough current in the ESC during full stall.

if that's the problem.

or it may just be the ESCs can't handle it.
02-16-2020 10:21 AM
dethmachinefab Never ran it s bus, only regular rc servo pulses. It drives fine on 12v, 24v it freaks out. Turret rotate works on both voltages. My drive motors draw major current at stall, so I think that's been the issue, I hope.
02-16-2020 09:29 AM
Shefron
Quote:
Originally Posted by dethmachinefab View Post
Ordered the roboclaw 2x160 from basicmicro.

Started on some gun elevate brackets, but I'm not sure how to package everything. I plan to use a linear servo from servo city. Undecided on 2" or 4" stroke. Both are fairly large and fitting them and linkage is going to be tight.
Quote:
Originally Posted by dethmachinefab View Post
Here's a turret rotate video. I need to play with the settings to make it a bit smoother.

https://photos.app.goo.gl/9Fjbu3iwfW2vY1hNA
Did you try to use the reciever outside of the SBus function?


Might be fun to install a 37mm flare barrel onto the tank. Unless you want to register a 40mm barrel for some chalk rounds.
02-15-2020 06:34 PM
dethmachinefab Here's a turret rotate video. I need to play with the settings to make it a bit smoother.

https://photos.app.goo.gl/9Fjbu3iwfW2vY1hNA
02-15-2020 06:31 PM
dethmachinefab Ordered the roboclaw 2x160 from basicmicro.

Started on some gun elevate brackets, but I'm not sure how to package everything. I plan to use a linear servo from servo city. Undecided on 2" or 4" stroke. Both are fairly large and fitting them and linkage is going to be tight.
02-12-2020 09:45 PM
87manche
Quote:
Originally Posted by Shefron View Post
Thanks for the link. Looks like I need the Tic 36v4 version to handle a Nema 23 motor.

Did you figure out the problem you were having with using the SAbertooth 2x60?


Finally starting to put together the electronics kit that is needed. Figure I would start out with just motion for the tracks and then add on as money allows.

Controller - Trying to decide between the FrSky Taranis X7 or the X9D SE. Later includes the momentary buttons I would need.
Frsky Taranis X7Acess
Frsky Taranis X9D Plus SE

Controller battery - FrSky 2000mAh 7.2v NiMH Battery
https://www.getfpv.com/frsky-2000mah...amp=65956434.0


Track motor controller - Sabertooth 2x60
https://www.dimensionengineering.com...sabertooth2x60

12V batteries
12-Volt 75 Ah SLA


Beyond that Im a little lost and not set in stone for the items.
I'm sure there's some momentary switches n that x7

regardless, you can buy momentary toggles and just replace existing switches with them.

my taranis radio is not stock.
knobs and switches and shit that don't belong.
02-12-2020 07:52 PM
dethmachinefab
Quote:
Originally Posted by Shefron View Post
Thanks for the link. Looks like I need the Tic 36v4 version to handle a Nema 23 motor.

Did you figure out the problem you were having with using the SAbertooth 2x60?


Finally starting to put together the electronics kit that is needed. Figure I would start out with just motion for the tracks and then add on as money allows.

Controller - Trying to decide between the FrSky Taranis X7 or the X9D SE. Later includes the momentary buttons I would need.
Frsky Taranis X7Acess
Frsky Taranis X9D Plus SE

Controller battery - FrSky 2000mAh 7.2v NiMH Battery
https://www.getfpv.com/frsky-2000mah...amp=65956434.0


Track motor controller - Sabertooth 2x60
https://www.dimensionengineering.com...sabertooth2x60

12V batteries
12-Volt 75 Ah SLA


Beyond that Im a little lost and not set in stone for the items.
Still dealing with tech support on the issue. They want me to reprogram it, so I got a usb to ttl converter and may try later tonight or tomorrow. Been slammed with work so I have not had much time. If that does not fix it I'm ordering the other controller I linked, spent too much time fucking around.

I got the x7 and I like it. Once I understood how it works it's great.
02-12-2020 05:58 PM
Shefron
Quote:
Originally Posted by dethmachinefab View Post
Here's some stepper driver options.
https://www.pololu.com/category/212/...or-controllers
Thanks for the link. Looks like I need the Tic 36v4 version to handle a Nema 23 motor.

Did you figure out the problem you were having with using the SAbertooth 2x60?


Finally starting to put together the electronics kit that is needed. Figure I would start out with just motion for the tracks and then add on as money allows.

Controller - Trying to decide between the FrSky Taranis X7 or the X9D SE. Later includes the momentary buttons I would need.
Frsky Taranis X7Acess
Frsky Taranis X9D Plus SE

Controller battery - FrSky 2000mAh 7.2v NiMH Battery
https://www.getfpv.com/frsky-2000mah...amp=65956434.0


Track motor controller - Sabertooth 2x60
https://www.dimensionengineering.com...sabertooth2x60

12V batteries
12-Volt 75 Ah SLA


Beyond that Im a little lost and not set in stone for the items.
02-09-2020 09:54 PM
dethmachinefab
Quote:
Originally Posted by Shefron View Post
~37 inches. Need it under 39 if I want to get it thru the backyard gate.

Pulled the old turret out of retirement for a little fit check. Built this thing on the old bridgeport CNC that I had converted over to servo system. Might do some updating on the parts in the future to clean up some of the machining marks. Old knee mill was nice but not the same level as the Fadal. Rotary joints are used in fanuc robots and usually go cheap on ebay new. Backlash of 1 arc-min or ~0.0166 degrees. The bottom one is RV-40E-80 and angle joint is RV-40E-121. Last numbers are the gear reduction so 80:1 and 121:1

Need to figure a means to run the stepper motors with the RC controller. Would really like to avoid rebuilding the motor shaft adapters.
Here's some stepper driver options.
https://www.pololu.com/category/212/...or-controllers
02-09-2020 09:10 PM
Shefron
Quote:
Originally Posted by dethmachinefab View Post
Looks awesome. How wide is it?
~37 inches. Need it under 39 if I want to get it thru the backyard gate.

Pulled the old turret out of retirement for a little fit check. Built this thing on the old bridgeport CNC that I had converted over to servo system. Might do some updating on the parts in the future to clean up some of the machining marks. Old knee mill was nice but not the same level as the Fadal. Rotary joints are used in fanuc robots and usually go cheap on ebay new. Backlash of 1 arc-min or ~0.0166 degrees. The bottom one is RV-40E-80 and angle joint is RV-40E-121. Last numbers are the gear reduction so 80:1 and 121:1

Need to figure a means to run the stepper motors with the RC controller. Would really like to avoid rebuilding the motor shaft adapters.
02-09-2020 07:47 PM
dethmachinefab
Quote:
Originally Posted by Shefron View Post
Finally starting to look like a robot base.

Still figuring out how I want to build the center section, should be a little easier to test fit things now that the tracks are 80 percent.

Some how I was able to balance the tracks vertically to install the casters. I do need to order a 1/2-13 die to chase the caster bolts to remove the stack of washers.

Knocked out a few things this weekend.
1. Machined a hole into the side of the side plates to avoid fighting with the pulley chain between the gear reduction and allow for easier changing.

2. Machined the shafts to size. Left 1/8 extra on each side for some play.

3. Trimmed the side plates 1.5inches to allow for easier track installation. Little easier but still sucks due to weight.

4. Notched the Tensioner guide blocks to fit with the angles on the side plates.

5. Figured out the motor mount and a way to keep the tracks apart. The 1/2" thick steel Motor plate allows 1inch of adjustment. Welded the black pipe as a temporary spreader on the back.

6. Welded the bearing block nuts to the back of the side plates to help with installation.
Looks awesome. How wide is it?
02-09-2020 07:41 PM
dethmachinefab
Quote:
Originally Posted by 87manche View Post
click around on the servo city website.
you'll find all kinds of neat rack/pinion setups with winch servos and industrial stepper motors.


they still retain position feedback.

linear actuator will require some sort of limit switching, or a pot attached for position feedback to use for control.
This one looks good.
https://www.servocity.com/hdls-4-30-12v
02-09-2020 07:24 PM
87manche
Quote:
Originally Posted by dethmachinefab View Post
The winching idea is a possibility. But I don't think a large scale servo will have enough torque. Barrel may end up being 4' long and 20lbs. Its alot of leverage, especially bouncing around rough terrain and hitting stuff. I'm looking at some 200lb + linear actuators.
click around on the servo city website.
you'll find all kinds of neat rack/pinion setups with winch servos and industrial stepper motors.


they still retain position feedback.

linear actuator will require some sort of limit switching, or a pot attached for position feedback to use for control.
02-09-2020 07:16 PM
Shefron Finally starting to look like a robot base.

Still figuring out how I want to build the center section, should be a little easier to test fit things now that the tracks are 80 percent.

Some how I was able to balance the tracks vertically to install the casters. I do need to order a 1/2-13 die to chase the caster bolts to remove the stack of washers.

Knocked out a few things this weekend.
1. Machined a hole into the side of the side plates to avoid fighting with the pulley chain between the gear reduction and allow for easier changing.

2. Machined the shafts to size. Left 1/8 extra on each side for some play.

3. Trimmed the side plates 1.5inches to allow for easier track installation. Little easier but still sucks due to weight.

4. Notched the Tensioner guide blocks to fit with the angles on the side plates.

5. Figured out the motor mount and a way to keep the tracks apart. The 1/2" thick steel Motor plate allows 1inch of adjustment. Welded the black pipe as a temporary spreader on the back.

6. Welded the bearing block nuts to the back of the side plates to help with installation.
02-09-2020 07:00 PM
dethmachinefab
Quote:
Originally Posted by 87manche View Post
that's what the receiver can speak.
some ESCs will allow PPM as well, and we could make the RX output PPM.



I'm not sure how you're setting it up, but my first thought is a sail winch servo.

https://www.servocity.com/hs-785hb-servo
https://www.youtube.com/watch?v=OaRFgXzupFA

it will go to a position when commanded, so if you control all of this with a flight controller of some sort you could preprogram positions and keep it limited for travel in the software.
run a cable between two pulleys and that way it would let you have misalignment and the ability to easily swap out modular assemblies.
just unclip the cable from one and clip it into the next. sail boat guys have all the fittings.
I'd think that's the easiest way to get the kind of travel you need, but there's all kinds of pull/pull and push pull things.

go look at the dubro or sullivan websites.

https://www.dubro.com/

Sullivan Premium Radio Control parts for planes, drones, cars, trucks, boats and helis

I'm really not sure how familiar you are with RC shit, so if I'm telling you about shit you already know about tell me to stop.
The winching idea is a possibility. But I don't think a large scale servo will have enough torque. Barrel may end up being 4' long and 20lbs. Its alot of leverage, especially bouncing around rough terrain and hitting stuff. I'm looking at some 200lb + linear actuators.
02-09-2020 05:50 PM
87manche
Quote:
Originally Posted by aczlan View Post
Specs say:


Aaron Z
that's what the receiver can speak.
some ESCs will allow PPM as well, and we could make the RX output PPM.

Quote:
Originally Posted by dethmachinefab View Post
Did a bit of work on the turret. Sides tacked in place. A few more bits need to go into the front plate to hold the barrel. Still thinking about what to use for elevate function.
I'm not sure how you're setting it up, but my first thought is a sail winch servo.

https://www.servocity.com/hs-785hb-servo
https://www.youtube.com/watch?v=OaRFgXzupFA

it will go to a position when commanded, so if you control all of this with a flight controller of some sort you could preprogram positions and keep it limited for travel in the software.
run a cable between two pulleys and that way it would let you have misalignment and the ability to easily swap out modular assemblies.
just unclip the cable from one and clip it into the next. sail boat guys have all the fittings.
I'd think that's the easiest way to get the kind of travel you need, but there's all kinds of pull/pull and push pull things.

go look at the dubro or sullivan websites.

https://www.dubro.com/

Sullivan – Premium Radio Control parts for planes, drones, cars, trucks, boats and helis

I'm really not sure how familiar you are with RC shit, so if I'm telling you about shit you already know about tell me to stop.
02-09-2020 05:44 PM
santa V2.0 This thread is fucking COOL. I admire your craftsmanship and focus, I'd have gotten frustrated and quit already
02-09-2020 05:10 PM
dethmachinefab Did a bit of work on the turret. Sides tacked in place. A few more bits need to go into the front plate to hold the barrel. Still thinking about what to use for elevate function.
02-09-2020 03:11 PM
aczlan
Quote:
Originally Posted by 87manche View Post
I couldn't remember.

I'd probably still try it with an external battery connected to the RX.

your problems might be RX related not controller related still.
this is where servo tester could be used to run it on stands and see.

does the controller only do analog pwm input or can it be configured for digital?
Specs say:
Quote:
Originally Posted by aczlan View Post
Looking at the X8R, it looks like it should speak both PWM (8 channels) and SBUS (16 channels)
Aaron Z
02-09-2020 02:19 PM
87manche I couldn't remember.

I'd probably still try it with an external battery connected to the RX.

your problems might be RX related not controller related still.
this is where servo tester could be used to run it on stands and see.

does the controller only do analog pwm input or can it be configured for digital?
02-09-2020 10:54 AM
dethmachinefab
Quote:
Originally Posted by 87manche View Post
and you've got two separate controllers right?

you need to depin one of the BECs to the RX.
or really what I would try is disconnecting both onboard BECs and powering the RX from a 6v battery.

you should never have multiple powers in the RX because they are all tied to a common bus in there and it will freak a BEC right the fuck out.
No it's a single controller that has two input channels and two motor outputs, only one bec. It's designed for two motor differential drive vehicles. Only one power source feeding the rx bus.
02-09-2020 10:29 AM
87manche
Quote:
Originally Posted by dethmachinefab View Post
No spec on input amps, but I do believe the batteries are plenty capable of what I'm asking. During earlier driveline testing when the motor leads were connected to batteries direct this thing would really move.

It's got it's own bec that powers the rx, through the servo pigtails on the two channels. No other power source. I'm certain all radio stuff is good now because it works fine on 12v.

I think I'm going to get this controller. https://www.basicmicro.com/RoboClaw-...ller_p_37.html

Seems well suited to the job, and has some cool programming options.
and you've got two separate controllers right?

you need to depin one of the BECs to the RX.
or really what I would try is disconnecting both onboard BECs and powering the RX from a 6v battery.

you should never have multiple powers in the RX because they are all tied to a common bus in there and it will freak a BEC right the fuck out.
02-08-2020 10:47 PM
Provience welp, it's gorgeous, controller issues aside

you have been making seemingly crazy quick work on this
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