Author Topic: Is it real, or just marketing nonsens?  (Read 223 times)

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Offline RoboticsMan

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Is it real, or just marketing nonsens?
« on: October 13, 2017, 10:16:03 AM »
The presses and robots at Tesla seem to be very well synchronized:

https://www.instagram.com/p/BaInXGBg9G7/?taken-by=elonmusk

Is this possible, or just pure marketing? Is it actually possible and safe to operate at that speed with those margins?

/RoboticsMan

Offline SkyeFire

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Re: Is it real, or just marketing nonsens?
« Reply #1 on: October 13, 2017, 01:13:41 PM »
I've done it in the past.  It's not entirely safe -- the presses have too much inertia to stop if the robot faults partway out of the press.  But as long as nothing unexpected happens, yes, you can run normally like that.  When I did it, we had the press position fed realtime to the robot on each side, and had a background routine that monitored the robot position vs the press position and measured how close they cam to colliding... and then kept firing the press 100ms earlier every cycle, until they were too close to collision, after which it would back off the press firing signal by 100-200ms.    Watching the line self-optimize over the course of the first 30-40 parts was amazing... and nerve-wracking.

If that load robot ever faults partway out of the press, you're almost certain to destroy that end effector -- that's one reason that normally any part of the end effector that goes between the dies is made to be disposable, and not very strong.  In the event of such a collision, the #1 priority is to protect the dies from damage, not the EOAT.  This is because even minor repairs to a die can entail hours, if not days, of downtime, and lots of expensive manual labor.  It's even worse on dies that stamp "cosmetic" surfaces, like outer body panels.

I'm not sure those are regular robot arms, though.  There are press systems that make special kinematic arms that are part of the press -- the POV never pulls back far enough to tell exactly what these are.

Offline RoboWeld

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Re: Is it real, or just marketing nonsens?
« Reply #2 on: October 13, 2017, 04:04:04 PM »
I had to do a service call on a couple of ABB press tending robots many years ago, the customer wanted to do their own programming so gave control of the press to the master robot, unfortunately it never checked if the slave robot was clear before turning the press over - oops

I had to change the complete upper arm and wrist on the squashed robot.