T_Y's Build Log

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Paulmchurd
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Re: T_Y's Build Log

Post by Paulmchurd » Fri May 11, 2018 8:33 am

DieGracefullyRobotics wrote:
Fri May 11, 2018 6:17 am
Also, I believe those ESCs are single direction only, hence the cheap price. They are designed to power a boat prop or car wheel in one direction whilst a servo rudder/rack does the steering.
There are bi directional versions now. That include a switch for brake on /off. Less then £5 each as well. Just heavy!

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DieGracefullyRobotics
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Re: T_Y's Build Log

Post by DieGracefullyRobotics » Fri May 11, 2018 8:57 am

I just found the bit where it says forward and reverse. Doh!
Dave
Die Gracefully Robotics - Barely Even a Proper Team.

T_Y
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Re: T_Y's Build Log

Post by T_Y » Fri May 11, 2018 9:10 am

Paulmchurd does bring up a good point about the weight. especially because I'll be running 2 of them plus the vex!

Did a bit more looking and found these ones from Micron Wings. They're much lighter at only 4 grams and smaller too, for just a few extra quid. No idea about reliability or reputation though.
Thomas

Percussive Maintenance 2: Tech Support Boogaloo - Axebot
Have You Tried Turning It Off and On Again? - 4-bar lifter
It's Not a Bug, It's a Feature! - front hinged flipper
Working As Intended - Gripper

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peterwaller
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Re: T_Y's Build Log

Post by peterwaller » Fri May 11, 2018 2:15 pm

I couldn't see where it says they are reversible, many designed for driving small model aircraft are one direction only.

Ant Ipodean
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Re: T_Y's Build Log

Post by Ant Ipodean » Fri May 11, 2018 9:43 pm

We have been using the Bustophedon ESCs, and these ones:
https://www.aliexpress.com/item/JMT-20A ... 0.0.uqUWZr , with some success.

I have had a couple of failures with the Bustophedons, one DOA out of the packet, one recently had the BEC output fail inexplicably.

The JMTs have been fine so far and are a bit smaller and lighter - about 8g after removing the switch and some wire.
Make sure you order the JMT withOUT brake version.

Of course, a compact little dual ESC is ideal, if you can get one which is reliable/affordable/available ;)

T_Y
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Re: T_Y's Build Log

Post by T_Y » Sat May 12, 2018 8:23 pm

I asked about those Micron Wings ESCs, they have no BEC and only drive in one direction :( Those JMTs seem promising though, what is the purpose of the switch on them?
Thomas

Percussive Maintenance 2: Tech Support Boogaloo - Axebot
Have You Tried Turning It Off and On Again? - 4-bar lifter
It's Not a Bug, It's a Feature! - front hinged flipper
Working As Intended - Gripper

Ant Ipodean
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Re: T_Y's Build Log

Post by Ant Ipodean » Sat May 12, 2018 9:52 pm

The switch on the end of the pair of wires on the JMT (and the Bustophedon) is simply for on - off.
It is redundant in our application, so better to cut it off, shorten the wires, and join them together.

The switch on the corner of the Bustophedon board is for the braking function.
Keep it off, slide towards the corner.

Mike.

Derek Dudge
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Re: T_Y's Build Log

Post by Derek Dudge » Sun May 13, 2018 1:26 am

Maybe I missed something but I'm curious how come you want your drive controllers without braking?
My robots:

Third Law (antweight) - push/ram bot
Manticore (antweight) - hammer bot

Ant Ipodean
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Re: T_Y's Build Log

Post by Ant Ipodean » Sun May 13, 2018 2:20 am

Well, braking would generally be a good thing, subject to personal driving preference.
But on these particular ESCs, which I presume are primarily intended for RC cars, braking means you move the stick up to go forward, then far down to stop with braking, then back to centre, then back down if you want to reverse. ie. From forward to reverse: Move stick from forward to reverse to neutral to reverse.
Compound this effect on 2 channels and it's very confusing to drive in combat!

Mike.

Derek Dudge
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Re: T_Y's Build Log

Post by Derek Dudge » Sun May 13, 2018 4:05 am

Ahhh. Yeah that sounds awkward. Fair enough. I've only any experience driving with Rory's controllers and on those it's just let the stick centre to brake. Having to pull down, centre, then pull down again to reverse sounds a nuisance. Cheers for the explanation.
My robots:

Third Law (antweight) - push/ram bot
Manticore (antweight) - hammer bot

T_Y
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Re: T_Y's Build Log

Post by T_Y » Tue Jun 05, 2018 4:05 pm

It's been a while since the last update!

My exams are over now, so I can dedicate a lot more time to getting the bots up and running for the end of the month. So I maaaayyyyy have treated myself and picked up a 3D printer... I've spent a fair amount of time printing off random bits and bobs. I'm discovering loads of applications for 3D printed parts, I've been churning off miniatures for DnD!

But back to robots. I've printed off the brackets for Percussive Maintenance and a harness to mount the spanner to the weapon motors. I spent this afternoon cutting and drilling the polycarbonate panels, and now I have the shell!

Image

One thing I've learned is that my accuracy is not the best, but that will improve in time. For now, this will do. The next step is to get all the wiring sorted. I don't have the ESC for the weapon yet (it's still enroute from China) but I can get the drive system working. Another thing I forgot to check was if I could fit everything inside, as the 3D model in Sketchup only models the drive and weapon motors... I may have to make the shell a bit bigger to accommodate three ESCs, a receiver and battery!

I'm still fiddling around with Hello, World!'s mounting system for the armour panels. The original design for the brackets are too flimsy, to the point that I managed to snap a few of them by hand getting them off the raft, so I need to revisit that at some point.
Thomas

Percussive Maintenance 2: Tech Support Boogaloo - Axebot
Have You Tried Turning It Off and On Again? - 4-bar lifter
It's Not a Bug, It's a Feature! - front hinged flipper
Working As Intended - Gripper

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DieGracefullyRobotics
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Re: T_Y's Build Log

Post by DieGracefullyRobotics » Tue Jun 05, 2018 4:18 pm

That's starting to look great! Nice to see something totally new coming through.
Dave
Die Gracefully Robotics - Barely Even a Proper Team.

Paulmchurd
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Re: T_Y's Build Log

Post by Paulmchurd » Tue Jun 05, 2018 6:36 pm

Nice, what 3D printer did you buy?

Have you visited York hack space? I’ve still not made the journey to see if their is a robot building scene or not.

Really neat looking shell you’ve made.

MichaelG92
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Re: T_Y's Build Log

Post by MichaelG92 » Tue Jun 05, 2018 8:36 pm

I love the look of Percussive Maintenance, I can’t wait to see it in action!

Congrats on finishing your exams btw! I too shall be done in 48hrs, it can’t come soon enough.
Michael - Team MG Robotics

Fledgling Surrey based roboteering team

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voorsk
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Re: T_Y's Build Log

Post by voorsk » Tue Jun 05, 2018 8:37 pm

that looks really good! nice angles. :)
Team BLEEP Suspicious Houmous / Sprouting Potato / Fermented Melon / Black Carrot

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