switch between 3 driving rings with one motor

[arshiaIQ]

Hello again! I need your help

Any body can help me creating a mechanism to switch 3 driving rings (between 1 to 6) in order to have only one function engaged at same time?

I want to fully motorize 42009 using 2 ir receivers, 1 for drive and steer, 1 for controlling functions,

I want to use one channel to switch between those 6 sides of 3 driving rings and other one to power the input...

[arshiaIQ]

You could try something like this:

I have no idea if this works with three driving rings.

First, I think this cant be implantes with 3 rings,

Second, it is not definite, It should br definite

[Hrafn]

You might be able to adapt this one from DurianObried - it's a definite shifter with 6 positions:

I've built it and it works very well.

Piterx built some 4-position shifters using a shift drum:

[TheMindGarage]

Difficult but possible. I don't have any examples, but you could try looking at 6/5+R sequential gearboxes. The shift mechanism will be very similar to what you want.

[DrJB]

If there is more than one ring, you need a 'cam' mechanism to shift the many rings. The limitation is that you cannot switch in any sequence as the cam profile dictates the sequence. Most of the sequential gear-boxes out there are based on such idea, and should provide ample inspiration.

Edited June 5, 2016 by DrJB

[Saberwing40k]

Oh man, I've been trying to do this forever, it's hard. I'm still working on it, but i may have an idea.

[arshiaIQ]

Oh man, I've been trying to do this forever, it's hard. I'm still working on it, but i may have an idea.

I appreciate it! :)

If there is more than one ring, you need a 'cam' mechanism to shift the many rings. The limitation is that you cannot switch in any sequence as the cam profile dictates the sequence. Most of the sequential gear-boxes out there are based on such idea, and should provide ample inspiration.

Would you explain the cam mechanism...?

Sequence is not important, as its for switching functions and not speeds, the reason I didnt named it 6 speed gearbox is this sequence, which may give freedom because of order being not important

You might be able to adapt this one from DurianObried - it's a definite shifter with 6 positions:

I've built it and it works very well.

Piterx built some 4-position shifters using a shift drum:

It does have 6 definite positions, but have you managed to put it on something to switch 3 driving rings?

Edited June 5, 2016 by arshiaIQ

[arshiaIQ]

Any body helps? I really want this... ive been trying designs and crawling over the net for melleniums... im getting depressed :D

Help pleaase!

[Didumos69]

Any body helps? I really want this... ive been trying designs and crawling over the net for melleniums... im getting depressed :D

Help pleaase!

I've been breaking my head on this all day already! The only thing I can think of so far is something that always engages 2 drive rings and puts one in neutral position.

But I promise, when I think of something that could help I will let you know

Edited June 5, 2016 by Didumos69

[Jeroen Ottens]

You can use the same mechanism as was used in the 8043, but that does require 4 motors, one for switching and 3 to drive the functions.

Another option is to use the shifting mechanism of Sheepo's sequential gearboxes. On those you can engage one switch at the time. Of course you'll have to change the gearing to route power to different functions instead of to one output with different gear ratios.

[arshiaIQ]

I've been breaking my head on this all day already! The only thing I can think of so far is something that always engages 2 drive rings and puts one in neutral position.

But I promise, when I think of something that could help I will let you know

Yay! Well thanks for your attention! :)

You can use the same mechanism as was used in the 8043, but that does require 4 motors, one for switching and 3 to drive the functions.

Another option is to use the shifting mechanism of Sheepo's sequential gearboxes. On those you can engage one switch at the time. Of course you'll have to change the gearing to route power to different functions instead of to one output with different gear ratios.

Changing mechanism is important, since this is not a gearbox, rings can be placed more freely.

Btw sheepo doesnt share anything at all, he is just a source of fancy creatures and not a helping hand at all

[Didumos69]

Each ring has 3 positions, so with 3 rings you have in fact 9 possible selections, even though only 6 are useful. This is quite complex.

The best I could find is this 6-speed gearbox with 2 servos from Sariel: http://sariel.pl/2015/03/6-speed-rc-servo-transmission/

[arshiaIQ]

Each ring has 3 positions, so with 3 rings you have in fact 9 possible selections, even though only 6 are useful. This is quite complex.

The best I could find is this 6-speed gearbox with 2 servos from Sariel: http://sariel.pl/2015/03/6-speed-rc-servo-transmission/

Thats a pretty good idea, but the challenge is to switch using only a single motor

Lets ommit definite control and focus on how to switch between 6 positions...

I also found that sheepo's mustang has a 6 speed gearbox, and unfortunately I cant even pay for the instructions! Anybody can just give me some "advice" about it?

[suffocation]

Btw sheepo doesnt share anything at all, he is just a source of fancy creatures and not a helping hand at all

I find it appalling that someone would criticize Sheepo - he puts tons of talent and effort into his creations and his website has plenty of free stuff.

[arshiaIQ]

I find it appalling that someone would criticize Sheepo - he puts tons of talent and effort into his creations and his website has plenty of free stuff.

Dont be misunderstood please...

I didnt mean this. He is a mastermind and the best lego designer ive ever seen, but he doesnt help much to others

Forget it

[TheMindGarage]

Each ring has 3 positions, so with 3 rings you have in fact 9 possible selections, even though only 6 are useful. This is quite complex.

The best I could find is this 6-speed gearbox with 2 servos from Sariel: http://sariel.pl/201...o-transmission/

You mean 27 positions? 3^3 is 27. Listing them with L being left position, R being right position and N being neutral position:

LLL LRL NNL RLL RRL

LLN LRN NNN RLN RRN

LLR LRR NNR RLR RRR

LNL NLL NRL RNL

LNN NLN NRN RNN

LNR NLR NRL RNR

Boldface ones are those that you'll actually want to use (NNN can be useful as a neutral gear, but you probably don't want to consider that).

[Brickthus]

2 methods come to mind:

1. You could make a 3-ring single motor mechanism from the new Porsche gearbox parts.

The Porsche uses 2 driving rings with a new smooth red axle extender in the middle, allowing the shift to be in any position, not restricted to 3 datum points as the previous white piece does.

If you add the outer sliding piece from another set and use another red axle extender and 2 more of the red cogs from the Porsche, you can make the 3 rings.

Then you have to arrange for them to be actuated with cranks at 120-degrees from each other; using 24mm pulleys like this should help (minus the pneumatic parts).

The test is whether it would be OK to have 2 gears engaged at once in the rotation cycle.

The Porsche avoids this because its gear selection cranks are at 90 degrees to each other, putting the non-engaged rings in the middle.

With 3 rings on one crankshaft, the non-engaged ones might be very close to engagement if not engaged permanently.

I suspect 3 rings on one crankshaft might be useful if it's a multi-function gear selector but would not work for a vehicle gearbox.

For the multi-function selector fr 42009 it would be important whether any of the functions needed a lot of torque if its driving ring were not fully engaged.

2. A linear function selector gearbox

My rail crane uses a 4-gear linear function selector gearbox for its 4 functions. One M-motor drives and the other selects.

The selection motor uses a white clutch gear to cope with the end-stops, with a worm moving the selector along the axle.

It can stop the selector in a mid-position and actuate two functions at once, so it can select a jib raising movement and a hook lowering movement at the same time for luffing operations.

It uses M-motors for both selection and drive because 3 of the 4 functions are worm-driven so that they stay put when not selected. The jib turn function has to be free-running when not selected so that it can move along the rails.

This pic shows one of the hook worm drives and the 4-cogs-in-a-row input shaft to the gearbox. The 20-tooth selector gear slides along the line.

My shunting loco has a similar gearbox for 3 functions (fast speed, slow speed and decoupling).

The shunting loco uses an M-motor for selection and an L-motor for drive to get plenty of torque. This will shift a huge train slowly, just like the real thing.

Inside the skin of tiles, the LiPo battery and IR Receiver are at the front, the two motors behind that, one on top of the other, and the gearbox fills the cab.

I suspect you would use an M-motor for selection and the L-motor for drive in 42009.

The jib extension and hook raise/lower functions each have a worm drive already and the jib raise/lower uses Linear Actuators that contain worms so they will all stay put when not selected.

With a linear gearbox like this it is theoretically possible to use some 32M axles to have 28 functions and also select adjacent pairs!

Mark

[arshiaIQ]

2 methods come to mind:

1. You could make a 3-ring single motor mechanism from the new Porsche gearbox parts.

The Porsche uses 2 driving rings with a new smooth red axle extender in the middle, allowing the shift to be in any position, not restricted to 3 datum points as the previous white piece does.

If you add the outer sliding piece from another set and use another red axle extender and 2 more of the red cogs from the Porsche, you can make the 3 rings.

Then you have to arrange for them to be actuated with cranks at 120-degrees from each other; using 24mm pulleys like this should help (minus the pneumatic parts).

The test is whether it would be OK to have 2 gears engaged at once in the rotation cycle.

The Porsche avoids this because its gear selection cranks are at 90 degrees to each other, putting the non-engaged rings in the middle.

With 3 rings on one crankshaft, the non-engaged ones might be very close to engagement if not engaged permanently.

I suspect 3 rings on one crankshaft might be useful if it's a multi-function gear selector but would not work for a vehicle gearbox.

For the multi-function selector fr 42009 it would be important whether any of the functions needed a lot of torque if its driving ring were not fully engaged.

2. A linear function selector gearbox

My rail crane uses a 4-gear linear function selector gearbox for its 4 functions. One M-motor drives and the other selects.

The selection motor uses a white clutch gear to cope with the end-stops, with a worm moving the selector along the axle.

It can stop the selector in a mid-position and actuate two functions at once, so it can select a jib raising movement and a hook lowering movement at the same time for luffing operations.

It uses M-motors for both selection and drive because 3 of the 4 functions are worm-driven so that they stay put when not selected. The jib turn function has to be free-running when not selected so that it can move along the rails.

This pic shows one of the hook worm drives and the 4-cogs-in-a-row input shaft to the gearbox. The 20-tooth selector gear slides along the line.

My shunting loco has a similar gearbox for 3 functions (fast speed, slow speed and decoupling).

The shunting loco uses an M-motor for selection and an L-motor for drive to get plenty of torque. This will shift a huge train slowly, just like the real thing.

Inside the skin of tiles, the LiPo battery and IR Receiver are at the front, the two motors behind that, one on top of the other, and the gearbox fills the cab.

I suspect you would use an M-motor for selection and the L-motor for drive in 42009.

The jib extension and hook raise/lower functions each have a worm drive already and the jib raise/lower uses Linear Actuators that contain worms so they will all stay put when not selected.

With a linear gearbox like this it is theoretically possible to use some 32M axles to have 28 functions and also select adjacent pairs!

Mark

Wow you seem to be a train lover!! Im interested in both your suggestions... I will try first one tomorrow, and would you give more details about construction one your linear switchbox? I really appreciate it