A drill manufacturer claiming higher torque and efficiency from their brushless motor is probably telling the truth - however that doesn't mean being brushless is the only reason for the improvement. They could put a really bad brushless motor in there that's no better than a high quality brushed...
And for you music lovers out there, play the video which is at the top of this FB page ... my daughter is playing the viola to the left (stage right) in the skirt. facebook.com/cvtvnetwork
Reliability comes from 2 places: (1) brushless is easier to cool, because the windings are on the stator near the outside of the motor. (2) No brushes that slow things down and require replacement.
I was just reading up on the Dyson digital motor. It can spin at 120,000 rpm actually. If it were to have just 1 lb-ft of torque at that speed, it would be putting out 22.85hp ... that's pretty awesome!
@Zaid I would guess that the torque of the motor itself would be about the same between DC and BLDC (all things being equal). But BLDC can run at higher RPM, and it can be geared down with a greater ratio.
But you should get much better longevity from a brushless, even if what they say about torque is a gimmick.
@NickAlexeev if the power input is the same to both, the fact that the speeds are geared down in the drill to a fixed speed (say 3000 RPM) it will mean that efficiency is the main actor here
I don't mean just motor efficiency... More overall system input-to-output efficiency
So things like gearbox efficiency etc. included
Interestingly, there is one user complaint with the brushless cordless drill that maybe wasn't thought of. When doing metal work, iron/steel filings/shavings tend to stick to the permanent magnet. Apparently they're not easy to remove (think compressed air)
Would this be safe?
tl;dr: No. It's hard to say exactly how unsafe or how bad the consequences might be.
Assuming the rails themselves weigh on the order of 5-10 kg, you're talking about almost doubling the advised load on the whole system.
From reading that advisory, it's hard to say e...
Kayak + roof rails lying in the middle of the road on my way home last night. Exciting!
I have an x3 diesel latest model bought it at an auction. Now it had a heavy diesel knock sound. So I decided to open the top. When I did, I saw neither visual damage on my injectors nor the cylinder head. But one piston is not reaching the highest level of tdc. What could have caused this? Secon...
@BobCross - Oh, snap. Sorry for your loss (and stupidity).
@BobCross - I had roof rails on my '04 Suburban. They said you could put up to 300lbs (I think??) on them. I don't think I ever really used them because they looked flimsy as all get out. If it didn't fit in the cargo area, it was getting towed by a trailer.
@Zaid - If you turn the crank and one of the pistons is not coming up all the way, it can be pretty easy to tell if there is a difference, depending on how much of a difference there is. If there was hydrolocking going on, it could surely have made a pretzel out of the con-rod. Other than that, you can use a dial indicator directly on the piston and get an idea of travel or lack there of.
@Zaid - @21:37, they are talking about making an adapter on the lathe to fit both the steering side and the spherical rod end. Why didn't they just get the proper nuts, one for each side, cut a piece of tubing and weld the two nuts to that. Would have taken about 10 minutes to fab and not all of the machining. I'm a mathematician at heart ... always take the easy way out.
The timing chain has stretched and the cam carriers have shattered after only 72,000 miles. What could cause this? I have found out that the car was mapped/chipped by the previous owner. Have no idea about cars. PLEASE HELP. The car needs a new engine. If the re mapping caused this, then I'm hopi...
I know the one design from BMW had some issues with timing chain stretch, which it appears this engine falls within. I'm not sure if the "N47d" applies for this or not, though. It is in two 300 series models.
@Zaid - I gathered that, lol. They do a mighty fine job of it as well. Did you watch the video all the way to the end? A little Easter egg for you, lol.
I noticed that our people do not like to upvote or generally vote at all. Comparing sites like aviation where you get a minimum of 10 votes, ours is like bargaining with a Chinese person you get nothing.
I personally Vote a lot but i think everybody should do the same. votes on our answers a pathetic.
@Paulster2 : en.m.wikipedia.org/wiki/BMW_N47 shows that it did suffer from chain stretch buy we're not sure if that is the one in the OP's car. They need to clear that up
I joined the pre-beta of woodworking.SE ... the questions there are very slim ... >2.5qpd. I have my highest voted post over there, which is 22 upvotes, I think. Absolutely crazy we don't have more voting going on here. We have the traffic, but nobody wants to sign up to vote. Even those who do sign up to ask a question don't do that much voting. Pretty crazy the highest voted question here hasn't even hit 50.
@BobCross - Yah, what I've read today points to the diesel engines ... I thought there were issues with the petrol engine around the same time as well. I haven't read anything today which points that way, but for some reason .... Clarrifying the question would help.
@DavidWinslow - The best we can do for that is to remind the OP to accept, but beyond that not much we can do. Cannot force a person to accept an answer.
@DavidWinslow - I've never built one (never had enough room to use one), though I saw some plans for one a while back. What are you thinking?
the stand itself is easy-peasy if you know how to weld.
What I'm getting at with the electronics is that you either have to tear the stuff out of your car or you have to purchase a separate unit to run the engine.
That's what I mean by PITB.
And for every different engine you have, you have to have a different setup.
The electronics themselves are not an issue for me either. I like EFI over carb any day of the week.
As for as voting goes or accepting answers ... look at this question and its answers:
I noticed coolant leak coming out under my car right in the center next to my. I notice a hole which looks like an overflow outlet and coolant comes from it. what can the cause be? It is a Mazda 3 2007.
@DavidWinslow - I realize it's a pretty common question, but really not my point. I'm getting at the fact the OP came the day of, signed up, asked the question, and has never been heard/seen again. Seems like a common occurrence around this site.
@DavidWinslow - I'll tell you, if nobody else will ... thank you for voting. I think it goes a long way to helping the site improve.
People aren't coming to the site to look at new Q/A ... they are coming to solve a problem with their vehicle. Only us diehard motorheads (petrolheads for you Brits!) stick around and answer questions. If there are only a handful of us here to answer questions, you know there are only a handful of people who are willing to vote.
BTW ... I think petrolheads just sounds wrong, and not because I prefer motorheads ... To me, the term petrol means gas, which when put together says gas-heads, which to me sounds like you are someone who is huffing the fumes.
Just me being me, though.
Motorhead would seem more universal ... but, each to their own.
@Zaid ... I used to call that "my son" until he moved out, which after that things stopped going missing but the damage was already done. He loved to borrow my tools and leave them lie where ever. All sorts of things came up missing.
Would this be safe?
tl;dr: No. It's hard to say exactly how unsafe or how bad the consequences might be.
Assuming the rails themselves weigh on the order of 5-10 kg, you're talking about almost doubling the advised load on the whole system.
From reading that advisory, it's hard to say e...
I noticed coolant leak coming out under my car right in the center next to my. I notice a hole which looks like an overflow outlet and coolant comes from it. what can the cause be? It is a Mazda 3 2007.
The Pitstop
The Pitstop