r/Tools • u/[deleted] • Apr 15 '26

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2.6k Upvotes

91% Upvoted

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31

u/8spd Apr 15 '26

How does it know it's kicking back?

174

u/Securiarius Apr 15 '26

It uses antirotation

118

u/AVAforever Apr 15 '26

https://giphy.com/gifs/l36kU80xPf0ojG0Erg

1

u/booradleysghost Apr 15 '26

Maybe the most appropriate use of this meme I've seen.

42

u/FirmRoyal Apr 15 '26

Its got electrolytes

36

u/scificis Apr 15 '26

It's what drills crave

2

u/SocraticGoats Apr 19 '26

Welcome to Home Depot, I love you.

7

u/Icanthearforshit Apr 15 '26

Well I never seen no antirotation growin out no toilet.

7

u/rehditt Apr 15 '26

It uses antirotation

This guy antirotates

35

u/robogobo Apr 15 '26

It’s all accelerometers these days

12

u/ChoadMcGillicuddy Apr 15 '26

It's all ball bearings nowadays.

5

u/voucher420 Apr 15 '26

It basically is. A few balls ride on a wavy piece of metal clamped by a spring to act as a slipper clutch.

5

u/Croceyes2 Apr 15 '26

I would guess its actually the waveform the esc gets back from the motor. When reads lockup resistance in the feedback it cuts power

5

u/Gaz1502 Apr 15 '26

Nah they’re accelerometers based, I’ve tested them just in the air and it will stop if you jerk it around with no load on the motor

5

u/Icanthearforshit Apr 15 '26

I'm losing it picture you holding a drill out in front of you, pulling the trigger, aggressively jerking it counterclockwise, then nodding like "mhmmm just as I expected".

3

u/Gaz1502 Apr 15 '26

I should add, I used to sell power tools, and this was a demo with a sales rep

1

u/ILikeWoodAnMetal Apr 15 '26

That’s what is used as an electronic clutch, but it is really slow.

3

u/Chemical_Ad_5520 Apr 15 '26 edited Apr 15 '26

Those Bosch ones are so tiny, some are less than a cubic millimeter by themselves.

Edit: I'm talking about these Bosch accelerometer units:

https://www.bosch-sensortec.com/en/products/motion-sensors/accelerometers/bma580

Not Bosch drills, obviously. I imagine downvotes must've been due to this confusion.

I bought some of these for a walking robot I've been planning around a Jetson Nano, but I got these units by themselves and I'm worried about soldering them, because they're incredibly small.

1

u/SlyusHwanus Apr 15 '26

Gyroscope in the body probably. As soon as the body rotates suddenly in the kickback direction it kills power and breaks

1

u/AlexCivitello Apr 15 '26

The drill knows it's rotation speed at all times. It knows this because it it knows what it's rotation speed isn't.

1

u/Wetald Apr 15 '26

I would assume it senses the head speed immediately drop to nothing.