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Re: Volvo G990 Grader
Looking good Stefan. Can almost see the smile on your face when putting the parts together. Will parts be TIG ' ed together?
I learned from my model that if MIG 'ed it was easier to have the fingers a little shorter, more room for weld in hole. Dan |
Re: Volvo G990 Grader
Thanks! I'm glad :) you realised that, Jens. However, this time it was necessary to file a little bit on the fingers after the bending before everything would fit :p.
Dan, I usually spot weld using the TIG and afterwards the rest is hard soldered or glued (where strength is of less concern). I haven't actually learned TIG'ing :( and prefer to just fuse together touching parts without adding any additional material and therefore it's actually good to have the fingers a little longer to have some spare material for TIG filling the gaps where the fit between the finger and the notch is not prefect. Stefan |
Re: Volvo G990 Grader
Top notch work! A lot of the 1:1 equipment I work on have parts built by the same tab / notch system -- makes welding everything together fast and accurate.
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Re: Volvo G990 Grader
Thanks! That´s really interesting. I didn´t know it is actually used in real life 1:1.
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Re: Volvo G990 Grader
Stefan, I´m speechless :eek::):)
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Re: Volvo G990 Grader
Amazing work!
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Re: Volvo G990 Grader
Alot of intricate parts... your head must be spinning at times!!! :eek:
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Re: Volvo G990 Grader
Nice work. This thing will be indestructible.
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Re: Volvo G990 Grader
Thanks guys!
@ Lil Giants You are right, it´s mostly spinning :D Despite a 50 page document with notes for all parts and some excel pages. Here a few close-ups of parts for the articulation: https://drive.google.com/uc?id=0B_yT...jRqQXB6eUZWU3M https://drive.google.com/uc?id=0B_yT...kJldTBMOW9zVmM The two center bolts (M3) and their nuts will be replaced by ones having a scale head. https://drive.google.com/uc?id=0B_yT...UNpSlp0QjhlLXc https://drive.google.com/uc?id=0B_yT...0kxNEJvR3B4TUE https://drive.google.com/uc?id=0B_yT...DNld09HYi03Q1E Edit: The rear eyes for the articulation cylinders are combined with the rear axle supports. Stefan |
Re: Volvo G990 Grader
I made some additional brackets and fixed them to the quadrants. As you´ll notice, the outermost parts of the bearing holders have now been attached. Today I´ll hard solder the joints.
https://drive.google.com/uc?id=0B_yT...kx3MnAyem5pUzA https://drive.google.com/uc?id=0B_yT...jZ5VWdqX1BIZGc https://drive.google.com/uc?id=0B_yT...m1YdnRjblBEeEk At a late stage I noticed that there is a recess in the quadrant for the cross bar, so I added that to the model (adding by removing :D:D). https://drive.google.com/uc?id=0B_yT...WxzbHIwNHRMUDA Stefan |
Re: Volvo G990 Grader
Soldering the joints looks realy good, did you have a owen to heat the parts (I don´t see any darkening in material from heat)?
And you used TIG to position the parts before soldering them together? Dan |
Re: Volvo G990 Grader
Hi Dan, I already polished those parts rather thoroughly. Next pictures show the same parts after final soldering and acid cleaning in 25% vinegar with salt :eek: for some hours but not yet rubbed (which I´m not going to do this time, as they will later be sandblasted). They are a bit darker but right out of the torch they looked pretty ugly :o. I use an oxygen/propane torch. And yes, they were positioned with the TIG, some 70 amperes for 0,5 to 1 seconds.
https://drive.google.com/uc?id=0B_yT...zVNSVVRdTIzcW8 https://drive.google.com/uc?id=0B_yT...kU5dkV4TWVZU2c Stefan |
Re: Volvo G990 Grader
Hi, below some pictures from the build of the front frame.
https://drive.google.com/uc?id=0B_yT...E5wY09Gd05Hd00 https://drive.google.com/uc?id=0B_yT...moyNGt6ZmRwUm8 https://drive.google.com/uc?id=0B_yT...25iS0o1YzhZczg https://drive.google.com/uc?id=0B_yT...UtxQUtmMVFFdWs https://drive.google.com/uc?id=0B_yT...zlGSHpRN0pTNHc https://drive.google.com/uc?id=0B_yT...DdqLS1EVUFvbGM https://drive.google.com/uc?id=0B_yT...3lZZkpnYWtuQ2M https://drive.google.com/uc?id=0B_yT...kUzd3BfSlNQeGc https://drive.google.com/uc?id=0B_yT...0NSR0F1WkhzM2M https://drive.google.com/uc?id=0B_yT...mpZenRQNjlsQ28 https://drive.google.com/uc?id=0B_yT...TkyblctZzBGRDA https://drive.google.com/uc?id=0B_yT...UgxWXV4SV96ZFE https://drive.google.com/uc?id=0B_yT...VlVTlpIRjNvUk0 https://drive.google.com/uc?id=0B_yT...lRfcWFSemF0TnM https://drive.google.com/uc?id=0B_yT...lFUdGlaQzlkN3M https://drive.google.com/uc?id=0B_yT...DdTYk80WWhROTg https://drive.google.com/uc?id=0B_yT...VZhTG9jcVhnZDA https://drive.google.com/uc?id=0B_yT...lV0U19PNWEzeHM Stefan |
Re: Volvo G990 Grader
WOW!!!:eek::eek::eek::eek: This is amazing! Great work. your moving along good too.
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Re: Volvo G990 Grader
Very interesting! I get so used to seeing guys machine all these great models that I forget all about the possibility of laser cutting parts, and welding them together. Seems once you have your parts, the build would go a bit quicker then having to machine everything. You're making excellent progress! Keep it up.
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Re: Volvo G990 Grader
Agreed, although we should not forget that the skill to design something like that in CAD in a cost-effective and functional way is also considerable.
Ideally, you'd still need have some machined/turned parts, like Stefan's axle carriers. For smaller scales/models, I think you might find that glueing degreased metal offers more than enough strength, especially if you take it into account during design. |
Re: Volvo G990 Grader
Very nice hard soldering joints. Looking like a 1:1 machine with all those weldments. Modern machines such as this are built from welding plates together. Much cheaper than yesterdays iron casting for everything. I'm stuck in yesterday with my antique machines; Riveting,casting,bolting, and sometimes welding.
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Re: Volvo G990 Grader
That's a great idea for building, using the tabs. It is inspiring to see what can be done. Any idea how long it might take you get this completed? Do you think the building process is going quicker with the tab design? Sure seems like a solid design.
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Re: Volvo G990 Grader
Thanks for the comments guys!
@ Espeefan & JensR: Yes, as 9W Monighan said, the real one is mostly plates, and since there is in any case quite enough work to be done, I decided to have most of the plates cut in a laser cutting shop. But some parts, like the hose bundling plate, I did myself ;) What to do yourself is of course a trade-off question between time, money, difficulty and fun, but in the case of the plates, everything speaks for having them done. I´ll give you an example, for the moldboard slide guide I´ll need four stainless strips (for the two models I´m building) 487 mm x 9 mm x 1,5 mm (about 19” x 11/32” x 1/16”). Not a big deal, but also not much fun and only four bucks apiece from the cutting shop... Even by the size of my model there are several small-strain-to-area-ratio parts for which gluing will be quite sufficient. @ Vanisle: Someone in this thread said that the tab concept is used on some of the real machines, too. And yes, I reckon it´s much faster for a given accuracy (at least the one I want), in particular when you take advantage of the inherent accuracy of laser cutting. Just think of it - once the parts are made you can put them correctly together almost blindfolded. Regarding the time to completion I´m sorry: What you see started almost five years ago and is surely bound to take another five, if not more :(:(:( (but positively seen, I´ve saved you five long years :D:D:D) And here´s the hose bundling plate (never shown to anyone, anywhere before :D). It´s used at the waist of the machine. https://drive.google.com/uc?id=0B_yT...U1UQkZVcmd1Q0E |
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