lcs Posted August 16, 2010 Posted August 16, 2010 Hello all, first post here. I wanted to share in progress pictures of a new project I am working on, a 6x6 mobile crane. This is my first 'major' non instruction technic build, so it is a learning experience. I do not have a lot of parts, I just got back into Lego last summer, most of these parts are from 8258 and 8265. So far, I have the axles built. I did a lot of time on Flickr and Bricklink working on this design. Once I had the design finished, it was quick and easy to duplicate. I put these together this afternoon while watching tv. On to the pics... Next up will be the main chassis with engine, I am thinking V8. Unfortunately, I do not have the parts or the skills to add suspension at this time. Once the chassis is complete, I will create the 'crane', I am thinking something similar to 8053. I may download the instructions and see what parts I have. Thoughts and comments welcome. Thanks Quote
DLuders Posted August 16, 2010 Posted August 16, 2010 It looks good so far! Welcome to the Eurobricks Technic Forum! Quote
Paul B Technic Posted August 16, 2010 Posted August 16, 2010 It looks good so far! Welcome to the Eurobricks Technic Forum! That is a really good start, I look forward to seeing some more work on it. Paul Quote
lcs Posted August 17, 2010 Author Posted August 17, 2010 Ok, not much of an update here. Didn't have much time to work on this tonight, I roughed in a frame for this crane. Structurely, it is a little wobbly, needs a lot of work. The problem I found here was joining the 3 axles, 2 line up not sure how I will get the drive line connected on the third. Gonna have to do some research on this. Any input appreciated. Quote
dhc6twinotter Posted August 17, 2010 Posted August 17, 2010 (edited) Ok, not much of an update here. Didn't have much time to work on this tonight, I roughed in a frame for this crane. Structurely, it is a little wobbly, needs a lot of work. The problem I found here was joining the 3 axles, 2 line up not sure how I will get the drive line connected on the third. Gonna have to do some research on this. Any input appreciated. Great start! As far as connecting your drive line to the third axle, is there any room to add another bevel gear on the opposite side of your center differential? Looking at the pictures, it looks like it may fit between the steering rack and the diff. The driveshaft could run under the steering rack and to the other axle. In other words, you would have two bevel gears on your center axle, with one going to the front axle, and the other to the rear axle. Anyways, not sure if you have room for that, but just a thought... Edited August 17, 2010 by dhc6twinotter Quote
lcs Posted August 17, 2010 Author Posted August 17, 2010 (edited) Great start! As far as connecting your drive line to the third axle, is there any room to add another bevel gear on the opposite side of your center differential? Looking at the pictures, it looks like it may fit between the steering rack and the diff. The driveshaft could run under the steering rack and to the other axle. In other words, you would have two bevel gears on your center axle, with one going to the front axle, and the other to the rear axle. Anyways, not sure if you have room for that, but just a thought... Perfect! Thanks for your input My original axle design has a bevel gear on one side, and a 3L beam as steering support. Not sure if you can see it that well in this picture: I removed the 3L beam and popped in a bevel gear... worked like a charm Even better, the bevel gear "acts" as a steering support just the same as the 3L beam did. Now why couldn't I think of that? I sat here the past hour pondering this, and it really is that simple. Long day at work I suppose. Now the problem from this is that the rear 2 axles when rotated counter clockwise, the front axle rotates clockwise... Braincramp. Edited August 17, 2010 by lcs Quote
dhc6twinotter Posted August 17, 2010 Posted August 17, 2010 Well awesome! I'm glad it worked out! I really like where you are going with this build, and I really like the idea of 6x6 with all wheel steering. I'll be watching this buildup! Quote
Silcantar Posted August 17, 2010 Posted August 17, 2010 Now the problem from this is that the rear 2 axles when rotated counter clockwise, the front axle rotates clockwise... Braincramp. Flip the front differential around the other way. Quote
lcs Posted August 17, 2010 Author Posted August 17, 2010 Flip the front differential around the other way. Of course! I keep over thinking things on this build. Late last night I was working on a 3 'skinny' bevel gear system to reverse axle direction but the problem was that it was taking up too much room. I'll flip the front differential tonight. I really appreciate all the help/input on this build. I started reverse engineering the crane portion of this last night. I am using 8053 as inspiration, I really like how compact the design is. I guess I will need to place a bricklink order sooner or later, I am having problems with too many different color parts. I guess it is fine for the initial build, but I want the end result to be easier on the eyes, not 5 different colors. Quote
lcs Posted August 19, 2010 Author Posted August 19, 2010 Sorry for no update yesterday, I didn't get a chance to build until this evening. I got a lot completed, the chassis is pretty much finished. Thanks to all the help I got from others, this thing is really coming along. It's a lot bigger than I expected it to be. Not sure about the tire size, should I go bigger (are there bigger tires?) or smaller? The other thing I was wondering about was the steering, is it better to have 2 tires turning in the same direction on the front or rear? It would be a lot to change, and I'd to find out I had it right the first time Any comments or suggestions? Off to finish the crane part of this build, hope to have pictures up tomorrow. Quote
DLuders Posted August 19, 2010 Posted August 19, 2010 Here is Bricklink's catalog entry about all "Tire On Wheel" relationships, showing how various Lego wheels can fit on various tire sizes: http://www.bricklink.com/catalogRelList.asp?relID=3 . Quote
Alasdair Ryan Posted August 19, 2010 Posted August 19, 2010 (edited) crane nowadays you can change what axles steer i think in normal drive the front axle turns only,(look at file below for steering) i thing the tires you got on are a bit to offroady,you have left a bit to muck space between the two back axles you will need to move the axle a bit closer together look at file below for reference look at this, it is about the size you are hoping to build http://www.terex-cranes.com/en/idc03/groups/webcontent/@web/@cra/documents/web_content/ucm03test_001327.pdf Edited August 19, 2010 by Alasdair Ryan Quote
-Jim- Posted August 20, 2010 Posted August 20, 2010 Another thing is normally the mid axle does not steer to the same angle as the front or the rear. In the document that Alasdair Ryan linked to it is shown on page 5. Well except when crab steering is used but that would be a real headache to incorporate in your model. Quote
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