Re: 777 HAUL TRUCK (1/12 size)
 

Princess doesn't have enough junk anymore! Too much made in China new stuff!

...and how did it go???? Did it steer???

Re: 777 HAUL TRUCK (1/12 size)
 

How did what go ??? Can't tell ya !!!
( Hey man.... I told you not to tell anyone !!!!..... LOL....I will add more soon....)

Re: 777 HAUL TRUCK (1/12 size)
 

Cut new plates for the rear swing arms to limit the down travel and avoid pulling the rear suspension cylinders apart everytime I picked it up.....needed to do this a long time ago....

[IMG]http://i1291.photobucket.com/albums/...ps2d955ded.jpg[/IMG]

[IMG]http://i1291.photobucket.com/albums/...ps3e0e09a0.jpg[/IMG]

[IMG]http://i1291.photobucket.com/albums/...ps28289f13.jpg[/IMG]

Re: 777 HAUL TRUCK (1/12 size)
 

I see what you mean about "SPACE".
Cheer's, Neil.

Re: 777 HAUL TRUCK (1/12 size)
 

Thanks for the link!!...yes a diff. would be much better!!! but space is a problem even on this bigger model...the axle housing (pipe) is about 2.850" OD

Re: 777 HAUL TRUCK (1/12 size)
 

Here is a vid of the steering...it is a bit slow but it does seem to have enough torque ( about 4 seconds , full travel, left to right)

[IMG]http://i1291.photobucket.com/albums/...psf91fd9dd.jpg[/IMG]

Thanks for looking....

Re: 777 HAUL TRUCK (1/12 size)
 

Sweet! Now lets see it driving around!
A friend of mine is running a brand new PC5500 face shovel in a BC coal mine. Yesterday he dropped by for a Xmas visit with a present for me...A 400 page operation and maintenance manual for the machine... In 1/10 it will be 35" tall at the house, and about 29" wide with the standard tracks. I'm not sure if I will try to build it but if I did it would be huge.

Re: 777 HAUL TRUCK (1/12 size)
 

Hi, thats a fine steering setup you've got there) The speed seams more than fast enough i would say. Is that just a standard servo? It seams to follow the stick, is it some special programing that makes the servo travel that many turns in each direction, is it available on several kinds of radios? what about the pot.meter that usually is in the servos, is it removed or?
I've got a Airtronics Sd-10G here, that I really haven't started to get that familiar to yet, but I noticed something in the book about adjusting servos up to 150% travel. On your, you must have but it to several 1000% travel?

Re: 777 HAUL TRUCK (1/12 size)
 

Great job on the 777 lot of nice ideas and it also helps to have a water jet close at hand. You have put some great thought into this build and it shows. I would like to do one to match my 1/12 scale excavator with some changer to what you did. Keep up the good work you have a talent. Ed

Re: 777 HAUL TRUCK (1/12 size)
 

Thanks...( I didn't get a video when I was trying it out the other day, the steering set up does have enough power even with 60lbs of weight in the box, but this is on a flat concrete floor...dirt could be a different story.I just have foam in the rear tires and the 60lbs was really flattening them out but it still seemed to turn OK , but I think the rear tires might be slipping on the rims)

A PC5500 in 1/10 would be awesome!!! If you build it you almost won't need your mini ex. anymore. What about the PC3000, just a bit smaller

http://www.equipmentcentral.com/nort...nt/ACF1184.pdf

Re: 777 HAUL TRUCK (1/12 size)
 

Here is a link to the winch servo I'm trying in steering, it has 3.5 turns
http://hitecrcd.com/products/servos/...-servo/product

I got the steering idea from looking at this set up at Servo City
http://www.servocity.com/html/spg785...tom_mount.html

Re: 777 HAUL TRUCK (1/12 size)
 

This is such a cool build to watch, and you are making incredible progress! I'm glad you got some larger photos up. I like your drivetrain and that steering system is pretty cool. I hadn't seen that style servo rack on servocity before. Those guys are constantly coming up with lots of new products. Genius idea on limiting the rear suspension travel, with those new arms and the set screw stops too.

I hope you don't mind, but I'd like to offer a suggestion for your steering knuckle drag links are set up. I've tried an identical system just like that before and I found that you can't get the proper ackerman geometry with it. The inside (of the turn) tire should turn in sharper than the outside. It makes a huge difference in steering. Right now, yours is the opposite. On a heavy truck like this, you might notice an improvement even more so than smaller models. It will 'plow' less in the turns.

It looks you could pretty easily fix the geometry, if you wanted, without changing anything but the way your drag links are bolted to the center steering arm. You just need to swap the right and left side drag links, where they mount to the center arm, with each other. Obviously you can't do that without interference, unless you bolt one drag link on the top of the arm to the top of the steering knuckle, and one on the lower side of both the arm and the knuckle. Picture worth a thousand words....

http://i4.photobucket.com/albums/y12...psd867d91d.jpg

I don't know if you have the room for changing the drag links to one under, one over, but if you do, give it a shot, and then take your truck for another drive to check how much better it steers. Like I said, I've been there, tried that! Just wanted to share my experiences. I hope you don't mind me suggesting this, and my intention is not to offend you. I can't wait to see this truck all finished up!

Re: 777 HAUL TRUCK (1/12 size)
 

I think a 1/10th 5500 would be a little hard to move around but you are right, I could probably sell my Kubota!lol I have been planning a big Euc R18 in my head for a while so the shovel may come in handy some day...

Instead of running foams in the rear tires, couldn't you just put the valve stems in the center between the duals?

Re: 777 HAUL TRUCK (1/12 size)
 

Ya a 1/10 shovel that size would be a challenge to move around sounds like work....you would just have to build a bigger truck to haul it around, something like the photo but bigger...much bigger

I plan on using air on the inside duals and have the stems facing in toward the frame, I really don't want to see valve stems but I can't help it....there is no room between the tires to get at the valve stems, and they are a split rim (two halves) so that means the tires must be mounted in order to put air in them.....may need a way to connect the rims together before they get installed....

Re: 777 HAUL TRUCK (1/12 size)
 

Could you extend the valve stem on the outside dual and run it through the rim of the inside tire so that both stems were on the frame side? Having air in all the tires would be nice so that you could adjust things to suit weight or traction.

Re: 777 HAUL TRUCK (1/12 size)
 

Good question....need to give that idea some thought !!!

Re: 777 HAUL TRUCK (1/12 size)
 

What about some of those short chrome valve stems?
Cheers, Neil.

Re: 777 HAUL TRUCK (1/12 size)
 

The pics of the steering are deceiving...I didn't have the tie rod lengths set up properly when I took the pics.... one side is longer(oops), which means the steeing arms are not parallel to each other or the frame when pointed straight. I think I know what you mean about the steering geometry when turning the inide tires always have a smaller turning radius which is why the inside front tire need to turn at a sharper angle than the outside tire...this is also the reason why a differential is needed....

Best part of being on here is learning from others...thanks for the input!!

Here is a screen shot of what I used to set up the steering on the truck at full lock....maybe I did this wrong??

[IMG]http://i1291.photobucket.com/albums/...psb00c699d.jpg[/IMG]

Re: 777 HAUL TRUCK (1/12 size)
 

Oh come on now that's just cheating! What happened to the build it wrong ten times, get p'd off, forget about it and have the solution come to you when you are thinking about something completely different way of building? I need to get more computer savvy!

Re: 777 HAUL TRUCK (1/12 size)
 

I need all the help I can get.....I still make things wrong ten times...I just make more mistakes faster....

Re: 777 HAUL TRUCK (1/12 size)
 

DADSGARAGE-you are doing some great work on this build. I have enjoyed watching your progress. A bit more on the akerman steering (if you care):confused: I think for proper akerman geometry with both front wheels pointed straight forward, the steering arms should be aligned with the center of the rear axle. Here is a neat diagram that shows how it works.
http://quaxio.com/steering/. Keep up the good work!!!

Re: 777 HAUL TRUCK (1/12 size)
 

Thanks for the info, getting the steering geomerty right is a tricky thing and challenging...mine will not be exactly right but it will be close"ish".. I found this picture of a truck standing on it's tail...interesting veiw of the steering


[IMG]http://i1291.photobucket.com/albums/...ps5bd58807.jpg[/IMG]

Re: 777 HAUL TRUCK (1/12 size)
 

That CAD drawing of the truck turning is exactly what you want. Perfect, in fact! I think the problem is your steering drag links do not travel equally, nor in a parallel / linear fashion, if that makes sense. Take a look at this picture.

http://i4.photobucket.com/albums/y12...ps892dbab3.jpg

Because your center steering arm swings in a substantial arc, the drag links do not maintain much parallelism with each other. With the wheels turned to the left, the more steering throw you add, the more out of parallel the right side link becomes. The result is the right link pushes the right knuckle more than the left link pulls the left knuckle. The knuckle on the right is at a greater angle, which is exactly the opposite effect you are after. Does that make sense, or am I barking up the wrong tree? :D

Re: 777 HAUL TRUCK (1/12 size)
 

That is a very interesting photo! In all honesty, your steering set-up looks like a very good facsimile of the 1:1 trucks! Makes me wonder if they have the proper ackerman effect or not? It could be that the 1:1 truck's links to the knuckles are longer, reducing the parallelism problems encountered in small scale, and the travel arc of the center arm may be less, if it's pivot point is further back from the bolts that secure the steering links?

Re: 777 HAUL TRUCK (1/12 size)
 

I was wondering if you took the two tie rods at the center pivot point and swapped them so that they would be close to the center pivot point if that would work better. Ed

Re: 777 HAUL TRUCK (1/12 size)
 

That's what Cat called "sprunion" steering on there forklifts,
If I remember correctly?
Cheers, Neil.

Re: 777 HAUL TRUCK (1/12 size)
 

I say call it good enough on the steering, finish the truck, and get on with the shovel already...:p

Re: 777 HAUL TRUCK (1/12 size)
 

Love the work you've done on the truck and the dozer, very impressive. I with Reg, good enough on the steering, lets see it haul a load.

Re: 777 HAUL TRUCK (1/12 size)
 

I have to agree with you both (RCP57,dirtpusher9)....enough on the steering already....this is a topic that could go on and on...I don't want to get into a debate on something that is right or wrong, debates only end up with someone getting offended at one point.....so at this point we will say my steering geometry isn't the best ( and no I'm not offended by any comments or suggestions...takes more than that to hurt my "feeling"...LOL) my only concern with the steering idea was if it would be strong enough to turn with/without a load on the truck...the other concern is the fact it has no diff. which could be the biggest problem when steering the truck no matter how good the steering geometry is or isn't. I do appreciate all the suggestions and ideas!!! Thanks guys for all the input!!! Building stuff from scratch is a challenge and any help from others is great and always welcome!!!

Re: 777 HAUL TRUCK (1/12 size)
 

Well said...now did you weld it together and paint it this afternoon or what?

Re: 777 HAUL TRUCK (1/12 size)
 

Ummm...no.....:p......but I will add some pics....

[IMG]http://i1291.photobucket.com/albums/...ps762534d1.jpg[/IMG]


[IMG]http://i1291.photobucket.com/albums/...psf32c159f.jpg[/IMG]

[IMG]http://i1291.photobucket.com/albums/...ps51b8e8b7.jpg[/IMG]

[IMG]http://i1291.photobucket.com/albums/...ps027c8d0c.jpg[/IMG]

Re: 777 HAUL TRUCK (1/12 size)
 

awesome job on the ladders :cool:and the whole truck , I've been watchin it on the tube before you posted here .:cool::cool: H2O jet ? if so it's giving me some new ideas in the future .

Re: 777 HAUL TRUCK (1/12 size)
 

Quite a bit of dirt on those tires now hey...


The ladders look great!...The whole truck looks great actually. With some paint it's going to look awesome! Do you find that with each model, you want to create more detail?

Re: 777 HAUL TRUCK (1/12 size)
 

Ya...look at all the dirt hey...tells you how clean my floor is...I would like to get them really dirty but this time of year dirt is hard to find,or should I say just hard and under snow....

I'm happy with the ladders even though it would be better if they were round and not square...but if I can cut the parts out all the better...good thing I'm not a true scale builder !!
Yes...having a bit more detail does seem to be getting more important for me even on my "Plain Jane" builds!! There are some details that just have to be on the model...just not the same without them. The hardest part is making it all work right...then it seems once you get it working properly you just want to paint it and go use it... adding the details seems to get forgotten...or put off for along time,so the trick is never paint your model that way it is always a work in progress!! LOL :D

Re: 777 HAUL TRUCK (1/12 size)
 

Hi Ed...Thanks....and yes having access to a waterjet is a big plus!! Good thing....because it supplies the "talent" !!;) Hope my build can help you with yours...if I can be of help in anyway let me know. Thanks again glad you like it....

Re: 777 HAUL TRUCK (1/12 size)
 

Thanks IH......being able to cut parts on a waterjet has been very helpful...hopefully more builders will consider getting parts cut on a waterjet or lazer....it is a big time saver!!! The challenge might be in finding a shop to do small jobs....so this link might be of interest to some builders...small plazma cutting tables at "Torchmate"

http://torchmate.com/products/torchmate_2x2/ http://www.youtube.com/watch?v=ozZ52TatcIA

Re: 777 HAUL TRUCK (1/12 size)
 

A few more pics......

[IMG]http://i1291.photobucket.com/albums/...ps2f0998f2.jpg[/IMG]


[IMG]http://i1291.photobucket.com/albums/...ps8fd90df4.jpg[/IMG]

[IMG]http://i1291.photobucket.com/albums/...ps5363871e.jpg[/IMG]

Thanks again for looking....

Re: 777 HAUL TRUCK (1/12 size)
 

Very nice!

Re: 777 HAUL TRUCK (1/12 size)
 

Thanks...slowly getting this built....

Re: 777 HAUL TRUCK (1/12 size)
 

The Tipple 7 is coming along nicely. When I do one it will be made out of aluminum easier to machine and lot lighter. I got the wheels for it and that is as far as I got. I could have it water jetted I have a place that does it for me at a very reasonable price. Right now though I have 3 other projects that are taking up my time. Keep up the great work it. Ed