DrJB

The two parts are in general equivalent, unless used to switch gears. If used as an in-line connectors for axles, then they both fulfill the same function. Also, my understanding is that the earlier versions of the truck came with chrome wheels, and later production batches came with gray. In fact, sometime back, the version with the chrome wheels/parts was more expensive than the gray version. If somehow the buyer replaced some parts, you also need to watch out for old gray vs. bluish gray.

Simply fascinating build. Thank you for sharing. I've been collecting Trans parts for a while, and now realize there are many more shapes I was not aware of.

One here has to be careful and make sure this 'perfectionist habit' does not 'translate' to their work/livelihood. I'm an engineer as well, and often (at least in the past) get bogged down by 'needing' to constantly improve my design/solutions ... but one needs to know when to stop. I'll tell you this, when we hire people, we look typically for 3 attributes: 1. That the engineer/candidate knows their stuff - If I'm hiring a DSP engineer, he better knows everything about the math behind Windows & FFT 2. That he gets along with people - Many engineers are introverts and love to sit at their desk and talk to their computer 3. That he delivers on his promises - Many new hires meet requirements 1 and 2, but fail miserably at 3 ... because precisely of the need for non-stop improvement. Yes, Lego is a hobby, but in the end, one must know when to stop and say the design is 'good enough' ... The software industry has understood this extremely well: Release the software as is, there will always be time for future versions and bug releases. Also, releasing software enables the company to sell it, and make money to pay for the engineers, so they can work on the fixes. A bit of a digression, just to say don't let this Lego 'obsession' leak into your real-life job.

That's truly what a hobby is (by definition) ... I've had many hobbies over the years, and they all have that in common. There is ALWAYS something to tweak, whether it's a lego suspension, a reef tank, or even a vegetable garden ... and now, it's Home Automation (HA). Of all the hobbies I've had, HA is the worst of all, so much learning/reading, so little doing, and always tweaking.

Which sandwich panel ... the one below?

Very nice pieces indeed. While these would definitely increase the building options, I'm not sure TLG can make such parts 'easily'. When building a cavity mold for such pieces, while the shape is 'easy' (relatively) to make ... de-molding seems like an unsurmountable challenge.

Bravo, you obviously did not waste any time. How about a submission to Lego Ideas ?

Don't forget the ZNAP system. Did not offer many options, but great for building large structures (a bit like Knex). I have several such sets, and they're a good 'distraction' from the conventional system/technic parts. In fact, some of the Znap parts can be used as lift-arms.

There have been many 'flavors' of RC Cars over the past years. A while back TLG made some 'Racer' cars that were more robust than conventional builds (for example 8376). Later on, they made even more robust cars (8675), truly for outdoor use. Those came with rechargeable batteries and were very rugged (metal wheel axles).

Not so sure about that anymore (assuming I understood your point correctly). In the past, they had to pre-mix specific batches of plastic to make specific colors. And that is why on older sets all the axles are either black or gray. I believe I've read somewhere that they changed their injection machines to 'on-the-spot-color-at-will' technology and now, it's 'cheaper' to build any part in any color. The first 'explosion' of colors in axles came with the Bucket-Wheel-Excavator ... or maybe they put in some incentive (new colors) to increase sales of such set. You still need individual storage and parts management for the individual colors though. In fact, it is such injection machines that are now having a hard time keeping colors consistent ... the smaller the batch, the more difficult it is to keep the color consistent. But, you already knew all of this :)

Sometimes it could be as simple as: Old mold is worn out, and they made a newer mold with a simpler geometry i.e, cheaper to manufacture.

You're absolutely right. I saw that part a while back on a Chinese copykat and thought TLG will never make it as the mold is a bit more complex than the straight lift-arm (due to perpendicular holes). Glad to have more options available to us.

Yes, I know the feeling ... that is why I'm no longer a regular... I disappear for weeks at a time then an old flame comes back to life. Good 'hearing' from you again ... or maybe we're getting older (and wiser) and have less and less patience for non-sensical squirmiches. Also ... Not sure about the community at large ... but I find it 'impressive' (or is it disheartening) that a thread with so many answers ... does not have a single photo !!! I'm disappointed though, as when I come here, is to see pictures ... not read incessant rambling... To each his own I guess. *Peace*

Yes, you're absolutely correct. On the larger dozers, the blade typically has at least 3 degrees-of-freedom: up-down (connected to the track frames), pitch, and yaw. Would for sure love to see that replicated someday. Beautiful! Thank you for sharing. You can tell for sure (between the spring-loaded sprockets and equalizer bar) that the designer has spent a lot of time researching dozer kinematics. Are the instructions available? Never mind it, found its own thread. Is that x928cx1 one of your favorite parts? .... Mine too ... together with other parts waiting to be used someday ... :) If I recall, those spring loaded axle connectors x928cx1 were used primarily with Hockey players. Not sure they were introduced within the Technic theme ... but then again, I could go and check BL quickly to confirm. The black parts in the top middle, seem to be the earlier version of suspension springs for system (not technic) .... they do have a very short travel though.

Sorry about changing/editing my post ... I sometimes post a reply, get distracted (by work) and then come back ... If I may, I think you should 'uncross' the text in your. It is very useful information that you are providing and would make it easier to read. My collecting since 2003 comment was about my 'second' awakening. I first experienced Lego Technic with 851, when it first came out in the 80's ... I think. Glad we reached consensus. Cheers.

I have to admit I have little patience with long posts... though sometimes I write paragraphs myself. Yes, I did read your post more carefully this time, but there are 2 points: 1. My first wave of comments was about 'wishes' or hopes/dreams ... it was not about what I think TLG will do. 2. Your logic/math about ROI and why it does not make sense for TLG to invest in specific parts is a bit 'out-of-touch' with reality, at least if one looks at all the new flagship sets in recent years. TLG has on many occasions issued specific parts that they used only ONCE in specific sets. Some of those parts were re-usable, other not much so. The portal hubs of the Unimog had very limited reusability. Many of the Bionicle parts (which some view as an extension of Technic) had zero re-usability. There is another popular thread (Lego for Kids and Reusability) where the consensus is that nowadays, TLG is after 'build it once and display it'. If you believe that, then who cares about reusability? Do you think the many new panels/fairings (and color) of the Sian are reusable? Not for me ... but then again, I'm not a MOCer and cars do not appeal much to me. Yes, you have your own expectations (with longer LA's and a custom blade) and own version of reality and 'eco-system'. All of that is defendable/respectable, and that is what diversity is all about. Let's just be patient and hope that TLG will deliver on BOTH of our expectations ... whether they make ROI sense or not .... In the end, relax my friend, this is just a hobby, and you're free to dream/speculate and build whatever comes to your imagination. ;) *peace* I browsed some of the builds on your brickshelf account. Those MOCs are truly fascinating. If I may though, would be nice to link some pictures as those would 'entice' more people to go and visit. Thank you for sharing. :)

When a person answers to my comments with a 'No' ... that says there are two possibilities: either they have no clue about what I'm talking about ... or, I've lost touch and am not aware of the latest. If I recall, the original question was what happens when battery boxes are connected in either series of parallel. I do not recall the question mentioning WHICH specific battery boxes. Yes you can stack PF cables, and yes you can stack 9V cables. Now, based on the cables YOU have, can you connect batteries in parallel? I do not know. I have many different cables (I've been collecting Lego since 2003) and also many different boxes (such as shown below). Incidentally the small 9V box is my favorite. For sure, you can connect the boxes below in parallel with a 9V cable, then use the PF extension cable to go from either battery to the PF motor of your choice. If you're thinking ONLY PF cables, then you're correct. You also might be a newcomer to Lego (less than 17 years) and the pictures below would look like ancient artifacts to you :) Since we're on the topic, I also have the following boxes, and some of them interface to a computer (with an old DB9 Serial connector). I love those boxes and the old 9V cables. To change polarity, all you need is rotate the connector by 90 degrees. Back then, one needed to understand a bit about electricity ... and now TLG has made everything 'idiot-proof' ... whether it is the PF connectors, or the reversible gear clutch. Thank you Thorsen, very useful information that you have provided. In the past, it was relatively 'easy' to discuss these topics but now, with 'smart' battery boxes and custom electronics/protection circuits ... the simple physics are often not sufficient... unless one has spent a great deal studying them (like you have). Cheers.

Fascinating, isn't it? Here we are talking about desired features (wishes) and realism ... and you come with your visionary comments and negate all of It? Bravo, if you knew enough about Technic as the many on here, you'd have noticed the past several flagships, starting with 8448 all had new/specialized parts. It's Ok for us to dream, and it's Ok for you as well to spend $450 on a big box of common parts. Heck, enjoy your hobby.

Thank you for sharing. That is simply incredible. Now you got me thinking .... err ... dreaming.

You might as well ask for a Variable Volume Pump. Those parts are best made of clear plastic, so one can see the inner workings. Typically though they require very smooth surface finish for them to be hermetically sealed.

Of course I'm right ;) ... The current is NOT decided by the power supply. The power supply provides the voltage, and the load decides how much current it needs, based on its own internal impedance (Current = Voltage / Impedance). So, assuming the two batteries are 'equally' charged, my explanation above holds. If the two batteries are NOT equally charged, then there could be current flow between the two batteries. I say 'could' because it all depends on the electronics in the battery pack. I haven't played with PF cables in a while, but if I recall, you connect one cable to the first battery, the other to the motor, and the second cable to the second battery, and again to the motor. If I recall, the PF connectors can be stacked at will ... just like lego bricks There might be other options depending on which cables you have. There is an adapter cable that has a PF connector at one end and a 9V at the other. Though here, I would be careful with polarity, or you could potentially destroy the batteries (they'll overheat first)

Not to change the topic completely, but I had my share of issues with BL as well. I had some old/sealed sets I put for sale, Two buyers from Europe never paid me (and I did not send the sets) ... BL charged me $50 ... I tried to reason with them, but they insisted that the buyers paid me by 'other' means (not paypal) and that I 'violated' them i.e., took advantage of them ... I could not prove my case, and neither could they do theirs ... but the management (pre Lego) was not the best. Here I am ... complaining again.

I have several of this part in Dark Purple. It comes from a set I bought a while back, but I do not recall which it is. I did a search in Bricklink, and such part does not exist in Dark Purple ... Anyone has a clue which set such part comes from? Edit: It turns out the parts are not dark purple, but discolored blue from Set 4957. There are 32 such parts, and after several years in storage (inside dark closet), some of them have remained blue while others show some noticeable discoloration. Also, the blue vs others come from different molds (looking at the inscriptions underneath). They appear dark purple to me, but apparently many who responded disagree. So be it.

Well, based on some of the latest answers ... I'm tempted to say we have more kids on here than adults. It is human nature after all, to complain about everything, isn't it ? Some say we're born with that ... ... But it takes a 'grown-up' to see the positive in every situation (set/part) and either focus on that and get their joy, or take a pass and move on to something else.

Double the current and double the voltage is 'nonsense'. Connect in Parallel (feasible, with PF+9V cables) - double the play time, voltage is the same, current is the same, batteries last twice as long Connect in Series (no feasible with PF) - double the voltage, might fry your components if they have no voltage protection.