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DrJB

Eurobricks Dukes
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  1. DrJB
    Most likely it's the program itself (of course). Can you post a screenshot of the blocks/program? The way I would do this: 1. Start Program 2. Check if either of the two switches is activated If so, lower bridge, branch out (2 Y branches) 3. Wait for the other switch to be activated 4. Lift bridge. 5. Infinite loop, go back to #2 3/4/5 need to be done twice in your program, once for each of the branches.
  2. DrJB
    Nicely done. I would LOVE to see this in light blue ... though not all parts might be available.
  3. DrJB
    The math might be easier to formulate (and the motions to replicate) if the pen moves only along the axis of the egg, and the egg is made to undergo 'complex' rotation about its axis (not continuous rotation). The challenge there is that the gears driving the rotation of the egg need to be 'preloaded' so that any reversal or slowing down of the egg's rotation can be 'controlled' so as not to get jagged lines. Of course, for simple patterns (such as sinusoids), the egg will be rotating one way only and no need to control the backlash. I think it might be easier to build this 'simple' one first (continuous one-way rotation of the egg), then we can move on to more complex egg motion. We can elaborate a bit more on this if you're still interested. On a different note, PG52 mentioned he was working on a fifth version of the spirographe, any update on this?
  4. DrJB
    Lately there seems to be an abundance of excellent MOCs (with instructions) that many on here have built. I'm just trying to get a feel as to how many of such MOCs were actually built and what are the most popular ones. If I were to 'divide' the MOCs in groups I'd go like this: 1. Cars/SuperCars - Typically require flex axles (which are in short supply) 2. Trucks - No need for flex-axles, but typically very large part count 3. Everything else. I have personally built the following: 1. Crowkillers Murcielago 2. PG52 Spirograph 3. Madoka's SUV Mk 1 4. D3K's SwingLoader Mk 2 5. CanAm Spyder (do not recall the author) 6. Many GBCs (Philo+Akiyuki) 7. Various Sequential GearBoxes 8. Mahjqa Tachikoma 9. Mahjqa Metal Grudge 10. Barman's Avatar Helicopter So, which MOCS have you built and intend on keeping displayed for some time?
  5. DrJB
    SEC = Securities and Exchange Commission ... Those are the people empowered with ensuring the Stock Market runs as it's supposed to (almost).
  6. DrJB
    Here is a list of all the head-gear (helmets and so on) from brick-link. Several pages to go through, hopefully it's one of them. http://www.bricklink.com/catalogList.asp?catType=P&catString=16
  7. DrJB
    I like the above contraption, good job Cumulonimbus. Such design now gives me some 'fresh' ideas as I've been contemplating adding a transmission to Crowkillers' Murcielago. But since it has very small space between the two seats, it's been a challenge (impossible) to fit a transmission in there. With the discussion in this thread one needs only install the shift stick in between the seats, and the transmission can be moved elsewhere in the vehicle. There are pro-cons to the rods or cables approach. The major draw-back with cables is that they're active only in one direction (tension), and as such, they need to be spring-loaded. They have other benefits as well though my car (fairly recent) still uses rods. IN the end, and from my experience with the automotive, it really is up to the specific manufacturer and how reliable they've made their system over the years. Then there is of course the electro-mechanical option mentioned by Efferman, which goes along the whole idea/trend of 'by-wire' and electrification. It's a bit like clutch actuation on manual drive cars: In the not-too-distant past, VW used cables to clutch/de-clutch whereas Honda and Toyota used hydraulic lines.
  8. DrJB
    Very nicely done ... Reminds me of my time in Detroit an the 'dream Cruise'! A car parade. Not sure everyone knows of the Lincoln cars. So, here is a piece of US automotive trivia: Lincoln is the 'upscale' version of Ford. It is like Audi for VW, Acura for Honda, Infinity for Nissan, or Lexus for Toyota.
  9. DrJB
    That should be fairly easy to replicate. You will then need 3x or as many as there are in your MOC, and each of those can be connected to some lever/mechanism. Edit: I just checked the Ferrari's LXF reference above, and there, he uses a short 2L thin liftarm as a gear shifter. Neat trick.
  10. DrJB
    Check the building instructions of 8880, 8448, and 8466. Those are three examples of gearboxes operated by levers, or so called stick shift in the US.
  11. DrJB
    Yes part #15100 can accommodate pneumatic hoses. It has the same/standard ID (Inner Diameter) as the holes on all beams/liftarms.
  12. DrJB
    Agree that 8070, plus it has the old spindle and A-arms that most/ALL MOCs out there use. If you want a mixed collection of studded/liftarms, then possibly 8466 is a good car to get. You can get one for near $150 off eBay if you're patient, and last week one New MISB sold for barely $200.
  13. DrJB
    Jim, Thanks for jumping in and bringing in some civility. My point was not to escalate or start a virtual fight. This is a hobby after all and each one individual (person) has their own approach/expectation. Unfortunately some younger (aka immature) members on here do not yet understand that each person is entitled to do what THEY want with their bricks. I hope such members 'open-up' and accept the great diversity (of ideas) in this forum. Happy building/displaying/MOCing/trading/speculating/cutting ... or whatever it is you do with YOUR legos. Cheers
  14. DrJB
    Go ahead and spend your life within the constraints of YOUR surroundings ... As for me, I'd prefer to expand beyond what's available. To each his own, ;)
  15. DrJB
    I believe efferman already reported this on a prior thread. But, since we're on the Bionicle subject, I got two huge boxes a couple of weeks back off a local seller and they were full of some unique parts. While many on the Bionicle/Hero parts may seem useless in Technic, one can always use an X-acto knife and cut only that part that he needs. If you go down that route (and have many parts to alter surgically) then such Bionicle/Hero parts are a goldmine.
  16. DrJB
    I got one new as well (damaged box too) from eBay for rather 'cheap' ... While you make some valid points, you're a bit too critical of the set. Need to keep in mind that this was by no means to compete with the big contenders, and also that it was released a while back (I think right after the 8455 back-hoe). Sure, it's not a set to ride home about, but it fills a niche, small part count and thus, enough entertainment for an evening. My impression is rather positive, and I like it a lot, not as much as other sets I have, but it's rather unique in its right way and does deserve a place in any Technic collection.
  17. DrJB
    I can't find the link now but I think there was a side-by-side comparison in Sariel's review of the LeMans car.
  18. DrJB
    Thank you. I see a modded (surgically) clutch gear in there. Nicely done.
  19. DrJB
    As the title says, I'm looking for a way to find all posts I've made (or anyone else's) on EB. On other sites, you can find these on the user's profile page. Here on EB however, it shows only the last 5 posts or so. Any chance/trick to make the search/list all inclusive?
  20. DrJB
    Very nicely done. Thank you for sharing. I can see the engine and the diffs driving the front axle, but fitting a transmission in there is not an easy feat as it adds tremendously to the complexity of the contraption. If you could share few more pics I'd appreciate that, so I can do and LXF and capture this for 'life'.
  21. DrJB
    The main comment I have is that the frame appears rather weak (not stiff enough in bending and torsion), and it will most likely bend. It is the intent that the springs (shock absorbers) take on the deformation, not the frame. Also, you're using 4 XL motors and that is quite an amount of power. Some demanding applications I've seen use one motor per axle (per tire). Here you're using 2 (in tandem) for each axle. While this for sure will give you more grip/climbing ability, I'm not sure the weak elements (axles and gears in the differential) can handle the high torque.
  22. DrJB
    It appears the tires are 'small' for the truck. I know these are the largest Lego makes (unimog), but nonetheless. Are the tires to scale relative to some European truck (Scania, MAN, or else) ?
  23. DrJB
    Not sure about Ubuntu (last time I used Unix was in grad school ... 20 years ago!) but I recall I able to get it to work under Windows 7-64Bit, a while back. The other option is to try and run RoboLab (there should be a free version out there) and you can write programs for the RCX brick with it as well. Try the two links below. Good luck. http://www.eurobrick...showtopic=70888 http://www.sevenforu...-usb-tower.html
  24. DrJB
    Not sure it has to do with whether Technic is popular or not in the US. This may have to do with how large the US volume is. Let's face it, TLG does not have unlimited resources for production and as such, they must stagger their production/delivery schedule as their production allows it.
  25. DrJB
    Seems they're sold out of that model ... everyone on here using such actuator?
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