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doug72

Eurobricks Dukes
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Everything posted by doug72

  1. doug72
    +1
  2. doug72
    Totally agree with your comments,every year it’s the same speculation long before anew model is officially released. Patience is a virtue. I prefer to wait for the official reviews before deciding if to buy or not.
  3. doug72
    Has anyone found a way to use this part for grabbing GBC balls ? Crane Grab bucket with spring 75172
  4. doug72
    An L motor if you are referring to my rope lift module.
  5. doug72
    GBC Rope Lift - Ball limiting device for input added. Loading gate releases balls onto the lift platform and at same time blocks any balls in excess of 16 from moving. Three axles rise via a link & cam system to block any excess balls from entering the lift platform. As lift rises the loading gate drops and at the same time the three axles lower allowing balls the roll down for next lift cycle. It took a lot of time to get timings to work OK, by adjuste axle lengths & pivot points etc. Side view showing linkages and lift cam for ball blocking system. Video: Bit of a juggling act to hold camera & return balls back to the input.
  6. doug72
    Had also thought about that solution but adds complexity & more friction into the drive.
  7. doug72
    The way this part has been used might be the solution I,m looking for to load 15 balls per cycle for my Rope Lift GBC module !
  8. doug72
    That’s OK by me. Good progress, I found the train system ate up a lot of parts needing several part orders. Currently debugging my rope lift GBC module, loading gate made & OK but struggling to find a way to only allow only 15 balls to load each cycle. It will be a stand alone module but capable to be driven by a train unit, if desired.
  9. doug72
    Like minds think alike !
  10. doug72
    Thanks for the comments. Unfortunately there is no clearance to mount a counterweight at other end of the rotating arm even if extend it. Also a c/w would foul the 20T bevel gear. If I change the 3x5 lift arms to 2x4 lift arms to support the worm drive axle the available clearance space would be 1L. That only gives very little space for a decent counterweight !
  11. doug72
    You would need something to release the carrier at the top - something like an style old drop hammer pile driver.
  12. doug72
    GBC Ball lift Ver 3.0 (Red) Improved guide rails for ball carrier used instead of the six wedge wheels. Rope cord adjuster added to set the upper travel limit and to get correct tension so the crank arm does not deflect. L motor mounting improved and Ball carrier can hold 15 balls. Lift cycle with 12/20 gears is approx 15 sec = 60 balls / min. Dwell time at top 2 ses, at bottom 3 secs. With 8/24 gears lift cycle is approx 25 sec. cycle = 36 balls per min. Dwell time at top 3 secs and & 6 secs at bottom. Biggest problem was arranging the discharge chute to be high enough to clear a GBC train car with ball carrier Had problems with balls not rolling down the discharge chute and still needs improving. Now tested with a GBC Train and it is capable of running the lift, timing should be fairly easy to achieve for the reverser.
  13. doug72
    Now tested with different speeds. 3/24 is too slow 12/20 is best and gives approx 60 balls /min. and motor is a lot quieter.
  14. doug72
    Tried acounterweight but no good as ball lift relies on gravity to lower it. Part of the motor noise appears to be from the worm thrust, motor is quieter in one direction compared to the other. Ball rate is well withing GBC rules. Ball carrier holds 15 balls and on a 10sec cycle equates to 90 balls per min. I am going to gear down the motor to give lower rate, which will take strain off the motor, probably 12/20 (54/min) or 8/24 (30 balls/min) Thanks - thats what I set out to do, eliminate the need for reveresrs & use of gear racks etc.
  15. doug72
    With an L motor there is plenty of power & able to lift 15 balls per cycle. Time per cycle is approx 10secs. Might need a counterweight when I test it with a train unit. The cord tension has to be adjusted so the crank arm just raises the ball carrier to full height, if its too tight it would cause crank arm to deflect. The support guides need for lift need to be rigid otherwise it can jam at the top. Agree - lots of usefull mechanism can be found on model train layouts.
  16. doug72
    A long time ago - when I was into railway modelling -I came across a means of raising & lowering a warehouse lift using a long crank arm which constantly rotates in one direction. This allowed slow down at top & bottom positions with a short dwell period. I have now developed a Lego technic version for GBC use which does away with complicated gear racks and reversing mechanisms Drive is by L motor with a worm gear rotating a Z56 turntable with crank arm attached. The end of the crank arm has pulley wheel. Drive cord is set to raises the ball carrier to full height to discharge balls and when at lower position the cable goes slack to give enough dwell time for balls to load. Loading gate still to devise. Now built two versions and I hope to arrange the 2nd one to be driven by a GBC Train unit /reverser if enough power. Both versions use a two fold rope purchase which allows for a shorter crank arm. A long crank arm would flex too much under load. Version 1: For use in a GBC loop. Has loading and unloading control gates. Version 2: For possible use loading GBC Train ball carrier. Only a loading gate is required, discharge is self unloading at upper level. Tested using direct drive with an L motor. To be tested to see if a train unit can power it, but it may not have enough power or speed. A short video:
  17. doug72
    Thanks - Looks good Now tested and the first (L) version works best & is stronger. The 2L axles in the second version (R) foul the turntable gear ring.
  18. doug72
    To allow for an improved & secure mounting when using a 1L worm with a Z60 turntable a new part required. Similar to a LEGO Technic Cross Block 2 X 3 with Four Pinholes (32557) New part required: Cross block 2 x 2 with three pinholes, with all holes facing same way. I am sure this would also be useful elsewhere in dealing with the half stud offset often required when mixing studded and studless technic parts.
  19. doug72
    There are six used in the Akiyuki Catch & Spin GBC robots Check out the GBC forum pages.
  20. doug72
    Another contest i won't be taking part in !! (If is car related)
  21. doug72
    Now built your suggestion using your LXF file, but it doesn’t work., the worm gear only engages with the edge of the turntable gear ring. Supports for worm gear axle don’t align and nothing to stop frame for worm axle rotating like a hinge. Added bracing to kept things in the same plane, see last image. See photos. Mis-alignment: Hinge effect: 3L beam added to keep worm meshed, but stiil slight mis-alignment and more worm gear friction. Solution: Use the correct worm with each type of turntable or gear. i.e 2L worm with Z56 t/t and 1L worm with Z60 t/t.
  22. doug72
    A picture saves a thousand words.
  23. doug72
    There are other ways to introduce slip other than allowing gears to skip, which damages them. Children & others learn by making mistakes. I learnt when I was very young not to poke keys into a electric socket , never done is again !
  24. doug72
    Alternative arrangment for Z60 Turntable and new worm gear - Not as strong but OK for light loads.
  25. doug72
    Use offset gears as per image 24T / 20T gears also 12T/16T gears do the same thing and you are back on grid. Or use universal couplings if room.
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