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(...) I guess great minds think alike! Yeah it works well so far. Right now I'm building my own version of the new excavator with that same system. The thing to remember is to make sure the axles going to the switch can turn freely. I'll post some (...) (14 years ago, 14-Aug-10, to lugnet.technic)
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| | Re: Motorized pneumatics
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(...) Hi Nathan, Don't you love differentials? Smart gearboxes..... I invented the same pneumatic switch/compressor solution years ago, and its great! As you pointed out, how fast the switch flips all depends on how hard it is to pump the pump. (...) (14 years ago, 14-Aug-10, to lugnet.technic)
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| | Re: Motorized Excavator - expensive!!!
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I did not do the math on the power functions components. So thanks for sharing that! Yup I guess the Europeans get to enjoy a better price for once. I am little disappointed that Technic does not seem to evoke much passion here in the US. Well (...) (14 years ago, 12-Aug-10, to lugnet.technic)
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| | Re: Motorized Excavator - expensive!!!
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I know at another very large toy company that there is a person who comes up with the price of a toy (fulltime employee(s)!). It does not always have to do with the actual cost in creating the product. There has always been a suspicion that Technic (...) (14 years ago, 12-Aug-10, to lugnet.technic)
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| | Re: Motorized Excavator - expensive!!!
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(...) Straight currency conversion does not account for many things that have a significant impact on price: 1. VAT. So far, we've managed to avoid that evil, and it's been noted to account for a substantial amount of the price the Europeans have to (...) (14 years ago, 11-Aug-10, to lugnet.technic)
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| | Re: Motorized pneumatics
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The chain is not necessary. It was a quick way to hook the motor to the differential. There is sometimes a delay in the system because the pump is such a small load (even when the valve is completely closed). To avoid this delay, add mechanical (...) (14 years ago, 11-Aug-10, to lugnet.technic)
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| | Re: Motorized Excavator - expensive!!!
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(...) The answer to the higher price is Power Functions content. 8258 Crane Truck ---...--- 1x - XL motor ($10) 1x - Battery Box ($7) 2x - Linear Actuator ($30) 1x - Pole Reverser ($5) ---TOTAL---...---($52)---- 8043 Excavator ---...--- 4x - M motor (...) (14 years ago, 11-Aug-10, to lugnet.technic)
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| | Re: Motorized pneumatics
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The chain is not necessary. It was just a quick way of hooking the motor to the differential. There is sometimes a delay in the system because the pump is such a small load even when the valve is closed. One way around this is to give the output (...) (14 years ago, 11-Aug-10, to lugnet.technic)
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| | Re: Motorized pneumatics
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Hello Nathan, Is there a technical reason you use a chain link between the motor and the differential grear? Would it be unsave to engage the gears directly in this case? With friendly greetings, M. Moolhuysen. (14 years ago, 11-Aug-10, to lugnet.technic)
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| | Re: Motorized pneumatics
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(...) Hi Nathan, I really like your solution. I've seen a number of automated vales, but almost all had the drawback that they could generate considerable stall load on the motor. This solution appears to be much more efficient. Jetro (14 years ago, 11-Aug-10, to lugnet.technic)
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