Instruction to built a sequential 7+R speeds gearbox.
About this creation
Due to the large number of requests concerning my last MOC (Bugatti Veyron: http://www.mocpages.com/moc.php/172197) mainly with reference to the gear box, I have taken some time create some simple instructions. I’m not sure how to best go about this so I’ll explain them step by step which I believe will be enough.
To start of I’d like to say that what made me design this gear box was the fact that since the 8448 there hasn’t really been any development as far as gear boxes are concerned. AS a matter of fact there is a large number of great MOCs that in the end mostly use the same well-known, rather clumsy (although very reliable) manual gear box. Because of its reliability I decided to use this very gear box as the base for my design.
The gearbox itself is a modified version of the one you can find in the 8448, but built studdless and with two extra speeds (6th y 7th)
But in order to make it work one more change is necessary: all the Axle Connector Ridged (6538/a/b) mist be substituted by Axle Connector Smooth (6538c)
Important note!!!
The Axle Connector Smooth has two rounded sides and two flat sides. It is very important that the internal pins of the Driving Ring (6539) coincide with the flat faces of the axle connector
Additionally the structure that contains the Changeover Catches (6641) is built
Both parts are joined taking care to make them mesh correctly
After that the structure that contains the rockers is built
The rockers are placed over the handles of the Changeover Catches
The rail that will accommodate the gear selector must be properly secured
The rubber used in the gear selector must be very tense
It is put in place sliding it in from one of the sides.
Once it is in place, the gears can already be changed sequentially, sliding the gear selector forwards and backwards, meshing one gear and unmeshing another
Reverse
Speed 1
Speed 2
Speed 3
Speed 4
Speed 5
Speed 6
Speed 7
If the Changeover Catches don’t move o don’t move smoothly too much friction has been introduced in the construction. Go over the moving parts of the gear box one by one and make sure they have the least possible friction.
What remains it is the part needed to move the selector little by little. This can be done in several ways. The system I used is bulky but reliable and relatively simple.
The long liftarm you can see in the last photo is what will later become the gear lever.
Add the supports for the selector
Finally the two self-centring devices (top and bottom)
The rubbers should be neither very tight nor very loose. If the teeth on the device don’t grip or let go the selector they are either too strong or too weak.
That’s it!!!
The gear box should now work correctly. By pulling the lever away from the gear box you gear up and by pulling it the other way you gear down.
A video with gearbox working:
And instructions step by step for MLcad(with photos) by Jurgen Krooshoop (http://www.mocpages.com/home.php/21811)
here:
http://www.megaupload.com/?d=5PHY5HVV
Quoting Mingquan Lu
Hello, Mr.Sheepo, I am quite curious on how to modify this creation into a 6 speed sequential in order to moc my 8145, can you give me some advice on the necessary modification? Thanks
Very easy, you only need don't put the last 16t clutch gear(7th), and the gearbox works fine with only R+6 speeds
Hello, Mr.Sheepo, I am quite curious on how to modify this creation into a 6 speed sequential in order to moc my 8145, can you give me some advice on the necessary modification? Thanks
Quoting Merlijn Wissink
I have made PDF instructions (not the best in the world :-)) but better than de Mlcad model.
I can send it you if you want. Then you can check if it's good and then you can put it anywhere where people can download it.
(It's only an idea)
(my English is not very good, but good enough
:-))
Sorry for not response before :(. Yes you can send it to me and I check it.
I have made PDF instructions (not the best in the world :-)) but better than de Mlcad model.
I can send it you if you want. Then you can check if it's good and then you can put it anywhere where people can download it.
(It's only an idea)
(my English is not very good, but good enough
:-))
Quoting the ant
ok ive dled the instructions and i tried to make it in ldd. i think i succeded. may i upload it on mocpages if i say its "Sheepo's original construction just put in ldd by me"?
Ok, but in the link you can find it in LDraw. If you want make it in LDD no problem.
ok ive dled the instructions and i tried to make it in ldd. i think i succeded. may i upload it on mocpages if i say its "Sheepo's original construction just put in ldd by me"?
Quoting the ant
absolutely.love.it. i know this is a rather big request but could you please upload a image with all the parts needed? it would help a lot but its ok if you dont want/can.
If you want a make it, the best way its that you donwload the instructions(by Jurgen), the link is in the end of the post.
absolutely.love.it. i know this is a rather big request but could you please upload a image with all the parts needed? it would help a lot but its ok if you dont want/can.
That is amazing!! I really didn't expect it to work so well. The best Lego gearbox I've ever seen, but unfortunately it's massive, so I guess it's limited to XXL models only. Superb design- 5 stars
