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doug72

Eurobricks Dukes
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  1. doug72
    How about this for an epic Lego build. The worlds largest crane capable of lifting 5200T Runs on rail tracks with a turntable system. https://www.bbc.co.uk/news/uk-england-somerset-49673561
  2. doug72
    Welcome to GBC Yes, a picture says a thousand words. see forum guidelines on how to post images.
  3. doug72
    Oh Dear, in that case a 24T gear would also foul the 11L horizontal beam. Just checked my build and clearence is very tight even with the rubber tire but able to work OK. The hub with tire has a slightly smaller diameter and will slide through the middle of a 5 x 7 frame , where as 24T gears don’t. Suggest replace the two rear white 24T gears with four LEGO Wedge Belt Wheel (2786 / 4185) which have same diameter as rubber tire wheels.
  4. doug72
    3rd image :- Trip arm is down and the train chocks are UP to hold the train. 4th image:- Trip arm has justed hit the fixed trip roller (white ) The position of this has to be determined so train is held while elevator continuse to move UP. Try various small wheels of different diameters to find the best solution. 5th image:- Trip arm has now been fully moved such that the train chock is fully lowered and the train moves off the elevator. Re string. Its part of the counterweight system, based on @MajklSpajkl system but arranged to suit my build & availiable parts. Elevator with worm works OK without counterweigt system but will be slower when ascending. Using counterweights helps speed up travel up and reduces the motor load. The image you show is for the @berthil version WITHOUT a worm which uses a different arrangment for the upper level trip. Can you provide an image of YOUR actual build ?
  5. doug72
    In which direction ? Train entering elevator or train exiting ? ==================================================================== Goto page 24 @ see post by @Frequenzberater about this problem, with subsequent replies. Suspect you have not used a XOX cross block as shown in this image. this prevents trip arm hanging down. If it is missing train will over ride the chock when at upper level. Check also that trip arm is not hitting stop before elevator is at lower level, the tracks should line up as trip releases to train. Some images of your elevator build would be usefull si I can try & see whats wrong.
  6. doug72
    Elevator train trips. (Doug72 version) Lower level trip: Lower level train trip chock raised when elevator at upper level: Upper level train trip when elevator at lower level: Upper level train trip at point the train chock begins to lower to release the train. Upper level train trip with chock lowered allowing train to exit:
  7. doug72
    Does the “dash forward” occur when the elevator is at upper or lower level or both ?
  8. doug72
    My version does not use any rubber bands, both train releases use trip arms with counterweights. The link you posted shows the @Berthil version that does not use a worm gear.
  9. doug72
    For the worm drive version, the positioning of the gear racks is critical and requires a 1/2 stud offset. Note how close the end of the gear rack is to the 24T gears. Outlined by red box in image. When train is on the elevator the 8T gears on axle ends must sit over the 24T gear & the 1x1 tiles in the gear racks. When the chock releases the train, the initial impetus to move is given by the 8T gears on axles, acting on the two 24T gears. Once moved forward slightly the the 8T gears on axle ends engage with the gear racks to move train off the elevator. The 12 x 1 plate should be aligned on the 8 stud beam as shown to get the 1/2 stud offset.
  10. doug72
    White 24T gears will work OK.
  11. doug72
    No I have kept the 8 rubbers tires as my build runs very smoothly without any jams etc. Biggest problem is where to store it !!!
  12. doug72
    Nice mod for entry into the unloader, original design is very prone to jamming etc. Re Reverser for Loading module:- Notice in your video you are using two striker arms for the train reverser, but only one rubber band. Any reason why ? Your instructions only show one. I have had no trouble with using only one striker arm but can increase power by using two rubber bands. The train unit 15L beams tend to droop and restrict movement and can sometimes catch in the rotary dumper. I replaced these with shorter 13L beams for M motor train and for the L train motor used 11L beams which has less friction and cannot droop.
  13. doug72
    Correct & it’s very useful, also available at 17L diam.
  14. doug72
    Congratulations on building the debut GBC Train system. These problems are common with the original Akiyuki versions for the elevator and passing loop modules. Elevator:- trips and train stops are difficult to get adjustments correct. Sudden dropping is due to the rubber band at lower level losing tension allowing the train chock to release the train when lowering. The problem when raising is the latch releasing too early. The modifications remove all these trips, latches and rubber bands. With my worm version it is impossible for elevator to drop suddenly BUT is slower than the @Berthil version which uses spur gears & counterweights. It also meets the GBC ball throughput requirement of 1 ball / sec.. Passing loop module, @Berthil version is very reliable and the track switches can be set to allow it to be used as passing module or a dwell module.
  15. doug72
    This is a chassis I built some time ago but is still waiting for top rotating section. Main drive from XL motor with L motor for steering via subtractor unit. Uses tan thin bevel gears for final drive but could be changed to stronger double bevel gears or worm gears.
  16. doug72
    Ball Loading- Anti Jamming Modification # 2 As mentioned in the instruction notes, the balls can sometimes get jammed at the loading gate and get ejected at high speed from the module. This can also upset the timing. The sharp corner as shown below is the cause. Modification:- Remove the studded bricks (outlined in purple) and replace by stack of 3 x 5L beams. Beam A is pressed onto the base plate and 3 x 3/4 DBG pins inserted. Beam B place over the 3/4 pins and 2 x black pins inserted into the other pin holes Beam C added. The round corner pushes any extra ball back up the ramp as the ball loading unit moves three balls onto the ball carrier. Since making this mod I have not had any jams on this module.
  17. doug72
    Not possible as no room, any counterweight arm would foul the 15L beam connecting to the lift frame. Clearence is only 1L when rotating arm is at 12:00 o'clock, Load is light and motor is not straining - most of the noise is from the gearing. Module is very free running and is reliable.
  18. doug72
    Single Car GBC ball lift Mark 4 This was inspired by the successful build of The Sun GBC module. Uses a constant rotating L motor drive which drives the turntable and the crank mechanism for the loading gate using a 32L axle. The L motor via right angle 1:1 & 3:1 speed up drives the worm gear meshing with the 20T double bevel gear which rotates the 32L axle. The 32L axle has a 12TDBG to rotate the turntable & an 8T gear to drive the 40T gear with crank arm. Both are 5:1 ratio so allways in sync. The turntable rotates a 13L beam connected to a 15L beam which raises & lowers the lift frame. Lift frame is 22L travel which is max possible as axle cannot be any longer as any connectors would foul the lift frame. The 32L axle passes through the back of the lift frame and helps guide the carriage. The ball car carries 5 balls per trip which takes approx 8 seconds which giving a ball rate of 37.5 balls per min. An anti jamming arrangment stops more than 5 balls entering the lift car. The hardest part was getting the timing for ball loading correct. Again the dreaded 1/2 L offset came into play but finally got it working. Re-circulating ramps for video demonstration, but can be easily modified for through operatation. Overall view: Side View: Rear View: Anti Jamming ball loading gate: Video: Best with sound OFF !
  19. doug72
    Here is the correct link to my album for modifications for "The Sun" module:- https://flic.kr/s/aHsmG6ayfe
  20. doug72
    Warning:- if you have the ratchet mechanism installed make sure the drive rotates the correct way. if it is wrong then the ferris wheel jams and the timing will get out of sync. Even though I had the 11L beam in place to keep the 36T double bevel gear in postion, it still skipped on the 12T double bevel gear. This means re-timing the drive. I learnt the hard way !!!!
  21. doug72
    I think Its due to the limitations of Stud.IO which is difficult to show flexible or bendy things.
  22. doug72
    Nice MOD, the Akiyuki version has very tight clearence and some hard to find parts. This was my solution which can be seen on Page 17 of this thread and has proved reliable.
  23. doug72
    OThe Sun:- Mod no. 5 by Doug72 Ramp Turns using Technic parts. The yellow 4 x 2 slope is only required if balls tend to bunch up at the turns and is attached to the blue pin with studs in the red cross blocks. N.B. Orange 3L pins with bush X 4.
  24. doug72
    OK when I. click reveal hidden content but what’s the point of hiding them just upload the links from your image storage i.e Flickr etc.
  25. doug72
    Following a request from Ankoku to test build the Sun GBC following his instructions I built this in about 4 days. See video of completed module. Due lack of system parts I made some changes and after testing some modifications as shown & indexed in the image below :- These mods can be seen in the video or photos 1/. Improved upright to trip ball loading arm. 2/. Modification to prevent 4th ball trying to enter & jamming. Not had any jams since making this mod. 3/. Extra ball retarders on the top ramp to slow balls down before 180 deg turn. 4/. 180 deg turn at bottom of top ramp made using 3 x 11L flexible axles. 5/ Other ramp turns made from technic parts. 6/. 11L beam added to prevent 36T double bevel gear skipping with the 12T double bevel gear once timing has been set. 7/. Support for top ramp improved. 8/. Addition support added for 180 deg bend to prevent top ramp twisting when using flexible axles. 7/. Improved support for top ramp. 8/. Additional support to prevent ramp twisting when using flexible axles for the 180 deg. turn.
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