LEGO GBC - Turntable Cup to Cup (Berthil)

[@blurr9549]

looks great. I recently built this as well. I'm having a heck of a time getting the timing set for it. Did you have any difficulties setting your timing? If so, what did you do for it?

[@LEGO_GBC_NL]

Thanks! I had no difficulties once I figured out how to approach setting the timing for this one, but I agree it's not the easiest one (one tooth off can make the difference!). Will try to explain what I did (long story...) 🙂 First of all, make sure your 6 turntables can move/rotate smoothly without too much torque/friction. Many LEGO turntables are too tight and the 6 of them meshed together cause quite some resistance. If this happens the 24t gear won't have enough strength to handle all 6 turntables all together and will start skipping gears. The timing of the whole thing will be messed up because of this. Secondly, I did the (timing) setup in 3 main steps: 1. The 6 turntables => meshed together, so once all 6 are connected, they should operate as one sub-assembly and should not be able to change anymore. This is a bit of trial and error to know which exact teeth to mesh together. Start with attaching the 1st turntable (lowest one) and then work your way up. If needed, do a test after attaching each new turntable (easier to go one by one instead of all 6 at once). As mentioned by Berthil in his instructions, turntables 1/3/5 must be aligned as well as 2/4/6. Once all are connected, manually rotate them to check if they are perfectly aligned. 2. Position/latitude of the cups => this will be defined by the position of the huge piston and the 24t gear attached to the 1st turntable. Without the 24t gear being connected (temporarily slight it inwards over the 10L axle), I used the motor to move the piston to its max, then manually rotate the turntables. The first turntable should be in such position that the 1st cup can receive a ball coming from the steppers. See Berthil's instructions for the correct position/angle of the 1st cup (the other 5 cups are connected and will be automatically correct). If all is okay, slight back the 24t gear to its original position on the 10L axle. 3. Timing between the steppers and the rest of the module => should be the easiest one! If you built Berthil's updated version, you can simply use the built-in differential to set the timing of the steppers. In case you built the older version w/o differential (as I did), you can simply use one of the 16t gears at the bottom of the module. Just disconnect one of them temporarily and manually set the correct position of the steppers (bit of trial and error as well). Well, I think that's all I can say about it 🙂 Don't say this is the only or even the easiest way, but it worked out for me 🙂Hope it helps!

[@blurr9549]

This will help for sure. I was just looking at it a while ago and noticed that there is quite a bit of resistance with the big gear rack. I need to look into that, i will also check out the turntables. Thanks for the help.