Team Eventorizon: Build Diary

[blazerbotics]

Re: Team Eventorizon: Build Diary

Mine flashes if at some point it has lost signal, and then regained it. If you power everything up, then turn the TX off and on, it should work again but with the flashing light.

[PJ-27]

Re: Team Eventorizon: Build Diary

Same here, flashes when something's gone awry, re-starting the sequence fixes it.

[Mouldy]

Re: Team Eventorizon: Build Diary

When it flashes it shows it's browned out

Basically so when your rc plane falls out the sky you know why... You ran out of range/lost reception.

[Eventorizon]

Re: Team Eventorizon: Build Diary

Just ran Binky's 3.6kg disc on a 4S lipo as a preliminary test... Its F****** TERRIFYING! And if its like that on 4S I hate to think what 10S will take it to!

Though there are some problems. The mounts for the disc rub on the uprights of the chassis but that will be solved with some thrust bearings.
It also shakes like crazy for some reason... no idea why but we will have to find out.

PS: I have videos but as my father is rather enjoying keeping the design a secret I don't think they will be going up... well not until the night before the competition just to psych-out his opponents.

[Mouldy]

Re: Team Eventorizon: Build Diary

if it shakes like crazy on 4s, it will get exponentialy worse at 10s.... sounds like your disc isnt balanced.

[Eventorizon]

Re: Team Eventorizon: Build Diary

It was CNC'd by Kenny so knowing his skills it should be balanced. One tooth is chamfered left nad the other right. Would that do it?

[Mouldy]

Re: Team Eventorizon: Build Diary

potentially... and just because its been CNC'd doesnt make it instantly perfectly balanced.

Spin it by hand on a bearing, let it stop naturally, mark the lowest point when it stops, repeat.... if it keeps landing in the same spot.... its out of balance...

When you spin it up on 10s stand well back... could be dangerous if it shakes itself upside down etc.

[Eventorizon]

Re: Team Eventorizon: Build Diary

We did that (Admittedly for fun) when we got it; just spinning by hand it on its shaft and it always just stopped and it does that now.
Is it possible for a disc to be balanced in the plane of rotation but not on its axis? As the edge of the disc viably shifts about 1mm back and forth as we rotate it.
And I was inside when I did the spin today but I still feel I should have clamped it down to something

[Mouldy]

Re: Team Eventorizon: Build Diary

Has it been heat treated? Could be warped... Just see how bad it is, if you can still drive it I wouldn't worry for now.

And yeah bolt it down next time... If you see my YouTube, 360s first spin up the robot had a large industrial container weighing it down, and 720 got bolted in my vice in my workshop.

[PJ-27]

Re: Team Eventorizon: Build Diary

I think you should test it on 10s, and not bolt it down. Oh and film it.....

For technical help.... yes that's why....

[Ellis]

Re: Team Eventorizon: Build Diary

For science!

[Eventorizon]

Re: Team Eventorizon: Build Diary

Has it been heat treated? Could be warped... Just see how bad it is, if you can still drive it I wouldn't worry for now.

And yeah bolt it down next time... If you see my YouTube, 360s first spin up the robot had a large industrial container weighing it down, and 720 got bolted in my vice in my workshop.

It was case hardened but at 35mm thick at the outer run and 12mm in the centre I doubt it would have warped by almost a whole millimetre.

And yeah I will strap it down. I cant actually clamp it cos of all the sloping armour panels but we will get come ratchet bets and lock it to a paving slab. Or just stand well, well back and see what happens... the garden is big enough.

Though snow may make all of this obsolete... its only got 3mm of ground clearance.

[typhoon_driver]

Re: Team Eventorizon: Build Diary

The disc is statically balanced but not dynamically balanced so it will pass the balance on the bench test but when you spin it up the imbalance in weight along the shaft causes vibration. Just spin it up and stand back.

With a disc that big you will have bigger issues not flipping whilst turning due to the gyro forces.

[cavecrusher]

Re: Team Eventorizon: Build Diary

One tooth is chamfered left and the other right. Would that do it?

The disc is statically balanced but not dynamically balanced

Seems to me like that's the problem

[Eventorizon]

Re: Team Eventorizon: Build Diary

Today I was able to run a full 'bench' test of Binky [I ran a basic test on friday but I couldn't go to full throttle as the top was not on] and there is one serious problem.

Once the ESC was armed, the moment I moved more than about 3 meters away the disc went straight to full throttle. Thankfully the machine was clamped to a metal plate so it wasn't going anywhere but the only way to stop it was to get within a meter and regain the signal; and then pull the link when the disc had slowed down to a speed that didn't make it sound like a jet engine.

This didn't happen the first test even when I was a full 8-10 meters away. I think it was the armour blocking the signal as it was fine in the other test.

We are using a Spektrum DX6i and an Orange receiver, neither of which seem to be fail safeing properly.

Does anyone have any suggestions on how to solve this?