Re: Volvo G990 Grader
 

Stefan, Just how many bucks does it take to have that printed? I was thinking about using that method to make some other parts I have planned some day.
Maybe when that day comes,it will cost less than it does now.

Re: Volvo G990 Grader
 

Nice parts Stefan, do you need to compensate size on drawings to get part correct size after printing (like when making a mold)??
/Dan

Re: Volvo G990 Grader
 

John, I was thinking of a 400 W bl outrunner or a low rpm brushed motor and a three or four gear transmission. A problem is that the gear spread between the lowest and highest gear on the real 11 gear transmission is 15 times, i.e at 2100 rpm the ground speed is 2.1 mph in gear F1 and 30.8 mph in gear F11, so I have to find out how much of that spread can be taken up by the better low rpm torque capability of an electric motor.

Steve, the "large" part, which is 14.3 mm high, cost 12.50 euros (they actually quote the price in euros when you give a "Euroland" address). There are also different grades of plastic starting at one fifth that price. The small part is 10 mm across, 3 mm thick and went for € 6.27. For each item there is a 6 $ (yes, dollar) handling fee included, so in some cases it would pay of to upload drawings of suitably connected parts. Maybe increased competition will lower the price in the future.

Dan, a German forum colleague found out that you should enlarge your drawing by 1.8 percent to get it right at the end. I did that and 14.3 mm turned out to be 14.34 mm, not bad, and the 0.34 mm will be machined away, anyway.

Re: Volvo G990 Grader
 

so your squeezing all that under the hood? with full hydraulic system with tank and then batteries to boot? wow, ya first gear in forward range is a creeper gear loads of torque in the 970. so will you have the hood open ? and i got to ask if your having a rad and fan set up? i believe the fans are set up to reverse to blow the dust backwards threw the rads to help keep them cleaner. if your need engine pics or interior give me a shout and ill be able to get them within a day if i can figure out how to send then on here lol good luck keep up with the pics and great building techniques everybody from what i've read loves hearing about it!!

Re: Volvo G990 Grader
 

Wait can you 3d print rad an intercoolers? Hmm

Re: Volvo G990 Grader
 

Have been thinking of rad and fan but on the other hand, and as you indicate, it will get crowded enough under the hood and the hydraulic system is not at all used as much as e.g. in an excavator and there are a lot of excavator models without rad and fan. So much for operational rad and fan. Still, there has to be at least a fan and something locking like radiators since they are clearly visible from the outside. Sure the hood will open as on the real thing. 3D printability is a bit dependent on how delicate the parts must be, have a look at shapeways.com. Thanks a lot for the picture offer! Nice to know someone having access to a 970, and a bit envy, too... :o:D

Re: Volvo G990 Grader
 

Stefan: May i ask you about the tires of your grader? Do you already have them, or have a place to buy, or you will make it yourself (molding)? The machine i plan to build, would needs tires with almost the same size.

Re: Volvo G990 Grader
 

The optional 20.5x25 tires of the original machine in scale 1:8 (D=186 mm, W=69 mm) do not seem to be commercially available. Consequently I´d have to make them, too. What size would you need, exactly?

Re: Volvo G990 Grader
 

Mine is (in scale 1:14.5) D=184 mm, W=72 mm, inner D=70mm. But the hardest part of this challenge is to figure out how soft the tire should be to looks like the real at 1:1...

Re: Volvo G990 Grader
 

OK, I forgot to mention that my tires would have an inner D=55 mm. Despite the difference from your 70 mm I'd be very interested in hearing from you if you find some tires or start making them. I fear it will be hard to figure out the appropriate softness without actually making some tires to experiment with.

Re: Volvo G990 Grader
 

I just talked to someone who seems to be able to mold the tires, he will also make some test concerning the softness of the material. As i have any more info, maybe the finished tires, i will post it.

( The previous dimensions i mentionned was from a plan, which was not correct. The correct size of my tires 41.25/70-39 -> W=74 mm, D=172 mm, inner D=68 mm. Just for correct myself )

Re: Volvo G990 Grader
 

I too have to correct myself since 20.5R25 (a wide base size) evidently relates to a 25" rim, so the scale diameter would be 79 mm or 3"1/8.

Re: Volvo G990 Grader
 

I managed to finish the circle turn cylinders. Here´s a video from the first test under pressure.

http://youtu.be/qKv85_feX5Y

Stefan

Re: Volvo G990 Grader
 

Just WOW:) 54 bar, nice...

Re: Volvo G990 Grader
 

I'm searching for a while, and all i could find were pumps with max 10-12 bar. Are your's a commercial one, or you built it yourself? I would need 20-25 bar

Re: Volvo G990 Grader
 

Try Jung Fluid.

Re: Volvo G990 Grader
 

Yeah, Reg, you nailed it. My particular setup is a Jung 4001 (type designation IPZ1-HR-3) driven by a Flyware powerREX 430-300 motor. The pump delivers 0,5 liter/min @ 40 bar and 3000 rpm and is good for 120 bar. Here some pics from the build of the coupling block.

https://drive.google.com/uc?id=0B_yT...WFsaU5TY21iLVU

https://drive.google.com/uc?id=0B_yT...mMxTW1Eb1B0bzA

https://drive.google.com/uc?id=0B_yT...3hTSzZpa1VyWmM

https://drive.google.com/uc?id=0B_yT...EEyaWZIdlpsa2M

https://drive.google.com/uc?id=0B_yT...VNkOHBibUNyckE

Stefan

Re: Volvo G990 Grader
 

Thanks for the tips... As always i just found something myself after posting the question: http://www.123modellbau.de/modules/w...7&cat_id=51774 (it looks like yours)

Re: Volvo G990 Grader
 

That´s a Jung pump, alright. They have a whole range looking the same. The one in your link has a higher flow than mine. You might get a better price if you order directly from the manufacturer, Jung Fluid. As far as I know, they sell to private, too. Also Premacon sells them.

Re: Volvo G990 Grader
 

Converted some rod ends from RC4WD to more scale like ones. To make it simple, I used the original balls and the bronze inserts, which were put into a new housing. That´s why they are not quite as small as the scale would have required.

https://drive.google.com/uc?id=0B_yT...mJJdVZBbmhPQTg

https://drive.google.com/uc?id=0B_yT...HhGNTRaNzAya3M

https://drive.google.com/uc?id=0B_yT...kNWR0NEb0h4VXM

Stefan