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Sequential 7+R speeds gearbox instructions . Instruction to built a sequential 7+R speeds gearbox. . 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. Iím not sure how to best go about this so Iíll explain them step by step which I believe will be enough. To start of Iíd like to say that what made me design this gear box was the fact that since the 8448 there hasnít 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 donít move o donít 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 donít grip or let go the selector they are either too strong or too weak. Thatís 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 Also you can find more information in my website: sheepo.es If you have any comments or questions you can write to sheepo_86@yahoo.es Thanks for reading!!!


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