LG hombot robot vacuum cleaner disassembly

On a sunny day (Fri, 11 Apr 2014 09:19:32 -0700) it happened John Larkin wrote in :

OK now imagine a couple of thousand of boxes like that, all different of course, with miles and miles of cable interconnect, multiple control points, MW power consumption (all together) and thousands of people working with these, and flipped out screaming directors and a short timetable. And locations, size, remote, satellite links, and all on the tick of the clock, and you have a modern broadcast complex. Light, sound, video,

Yeah, this whole robot thing is highly overrated. Nobody would have a totally stone drunk sailor run a vacuum in their home. But, that is what the robot is, it just stumbles around until it hits something, then backs off and tries again.

Jon

Yeah, I'd never be able to get away with that! My wife didn't even know how to turn off her car alarm when she set it off. Some "helpful" people started pulling fuses out of the car, and she ended up driving for half a day with no stop lights and having to override the gearshift interlock. She had to call me so I could tell her "just lock and unlock the car with the key and it turns off the alarm."

I've got almost everybody running Linux of various versions, I do network backups when I get around to it, mostly it all works.

Jon

I wouldn't enjoy that. The alpha males would be the producers and the "artists" and the "talent." Techs and engineers are peons in a culture like that. And I like to work on time scales of weeks and picoseconds, not minutes.

There's the same problem in companies started by scientists; EEs get little respect. It's usually better in companies founded by engineers.

Yup. Same in astronomy and biotech.

Cheers

Phil Hobbs

What's going on with with the large resistor?

Not so. I have a DeWalt that's quite nice on plywood and such. I also have an older Makita that's great for cedar siding. It sure as hell beats a 10lb. corded monster when you're trying to trim a piece of siding, 15' up a ladder on the side of the house. ;-)

A circular saw used on a tree? You must be suicidal. Cutting a 2" diameter branch with a 6" saw? You *have* to be! Haven't you ever heard of a chain saw, or even a reciprocating saw? ;-)

Aren't trees still made out of wood?

Yes, and fingers are still made of skin and bone; much softer than even wood. Circular saws are very dangerous things when used by a someone with no respect for them. They are *not* designed for this sort of thing.

Not much different from cutting a 2x4. Sure, keep body parts away from the blade, in either case.

You're *wrong*. *PLEASE* leave the power tools to someone who knows how to use them. You're dangerous.

That's the source termination resistor that drives the cable to a piezo transducer. The optimum value wasn't known, so we made it easy to replace in the field.

The piezo squirts molten tin droplets into space at around 50 KHz.

I have all 10 of my fingers, which is more than a lot of professional woodworkers can say.

The branches were on the ground. Just cutting them into 3' pieces for bundling so the city would haul them off. I'm not getting up on a ladder with a cordless circular saw. ;-)

I don't have a gas chain saw (just an antique electric one without guards). The Hitachi version of a sawzall might have been better but I think the blade had gone walkabout.

Cordless drill: Great, especially when you have at least 2 batteries Cordless sawzall: okay Cordless circular saw: pretty much useless Flashlight attachement: Great because it sits up nicely when in the attic

The power tool that I really don't like using is the table saw. Much more so the slider radial arm saw, and way more than a lathe or mill. Apparently the first thing most folks do is remove that stupid thing that marks up wood and helps keep it from randomly flinging stuff toward you at high velocity (riving something?).

Best regards, Spehro Pefhany

And the time spent doing this is? You *really* shouldn't take up this, even as a hobby. You *will* hurt yourself.

Cutting live wood with a circular saw is *not* a good idea. First, the pieces aren't round and worse, aren't uniform. When cutting dimensional lumber, you can clamp the piece so it doesn't move. You can't (easily) do that with branches. The chances of pinching the blade are greatly increased and kick-back is a real possibility. That can really ruin your day.

The Makita isn't much different than operating a cordless screwdriver. It was quite safe - as safe as an work on a ladder. The saw won't cut much more than cedar siding, though. Even with a good blade, that's about all the 4" blade can cut. ;-)

If you don't have the tools to do a job safely, don't do it. Missing fingers (or worse) aren't fun.

Then you're silly. A RAS is *far* more dangerous than a table saw. Neither are to be used without a large pile of caution but physics is working against you with a RAS. A compound slider is much safer but it's not really comparable to either.

Riving knife? That's basically a splitter on steroids. It keeps the kerf open so the wood doesn't pinch the board. The difference between a riving knife and a splitter is that the knife adjusts to the height of the blade, so can be used for non-thru cuts. They don't damage the wood in any way.

If you're talking about the "blade guard", it's purpose is to tell you that your fingers are getting too close. Your eyes should be telling you that. ;-) Part of many blade guards is a splitter and anti-kick plaws. I rarely use the guard myself, and prefer a separate splitter and plaws (removes is seconds). I like to see what I'm doing, also.

Plaws only "mark" the wood if they're needed to save your bacon. Marking up the wood is a small price. OTOH, I find it simpler to just not stand in the path of potential projectiles. ;-) BTW, I had

A lot, for an electrical engineer. I've also done, and do, a fair amount of metal machining, mills and drill presses and bandsaws, too. A bandsaw is more dangerous than a circular saw.

You *really* shouldn't take up

Haven't so far. My worst tool accident was cutting my finger with a hand hacksaw. Band-aid level injury.

I won't have a vertical wood bandsaw. I have one of these

You put a chunk of metal into it, start it, and go get a coffee. It shuts itself off when it cuts through. Makes a bit of a racket, but it's a lot nicer than the way a hacksaw sounds when I'm the one doing the sawing. ;-)

They're like $250-300, courtesy of Chinese manufacturing. Throw outthe blade it comes with, and put a nice Starrett bimetal blade on it, and it's ready for work.

Best regards, Spehro Pefhany

Which is why you don't stand directly behind the table saw, right in the path of any projectile.