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TheMachinist
11-21-2010, 10:00 PM
I've been doing some research on these trucks. If anybody has any suggestions or tips on do's and don'ts for a build I'd be glad to hear them.
I've found suppliers of tires, drive motors, and electronics online. The hydraulics are another story. I might go with a worm drive and a scissor lift to dump the box.
This will be my first attempt at a scale scratch build so bear with me if I ask lots of lame questions.
Jordy
440

RCLogger
11-21-2010, 10:26 PM
Looks like a fun build Jordy
What scale are you going to build, how tall are your tires going to be?

greg

TheMachinist
11-21-2010, 10:52 PM
I'm aimimg for 1/14 scale.
The tires should be around 5" tall.

These tires from RC4WD look pretty close at 5 1/2"
441

ihbuilder
11-21-2010, 11:08 PM
try these they are 5 " and look closer to equipment tires http://www.rc4wdshop.com/go/product_info.php?products_id=967 lookin fwd to seeing this 1 :)

dirtpusher9
11-21-2010, 11:19 PM
I wonder how hard that sidewall is on that tire Steve, do you know? It's a good looking tire and not a bad price for two.

aseejr
11-21-2010, 11:50 PM
Nice looking piece of equipment. Looking forward to seeing it around a construction site!

TheMachinist
11-22-2010, 12:24 AM
try these they are 5 " and look closer to equipment tires http://www.rc4wdshop.com/go/product_info.php?products_id=967 lookin fwd to seeing this 1 :)

I like those tires even better and as for side wall 2 inserts could be put in side by side.

TheMachinist
11-22-2010, 12:33 AM
Jr, you'll probably see it long before it hits the dirt. I'm going to need lots of parts from the R/C shop and I'll need help tracking down specialty items. I'll be in on Tuesday to order the tires for starters.

I wonder if the Castle Mamba Monster ESC will power 6 gear motors running a 6S lipo?

Jordy
My helicopters are going to be jealous if I start spending time with a truck:rolleyes:

Lil Giants
11-22-2010, 05:44 AM
There's this dual esc, commonly used for tracked models, but also work well to turn the "mix" off and use the two motor controllers seperately. I use the 2x10 to power my six drive motor adt and the other controller to power up the hyd pump... whereas you would use the 2nd esc for your screwdrive dump mechanism.

http://www.robotmarketplace.com/products/0-SABER2X12-RC.html

I haven't looked at this site since last winter, they now have a 2x12 dual controller, but the BEC still sucks with only 1amp supply to the rx. I've been adding the rx batt to my models for extra current draw on the rx for many servos and you're likely going to use a 1/4 scale servo or something similar to steer your adt, so this will be a necessity for more rx power.

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXSWL3&P=M

TheMachinist
11-22-2010, 10:49 AM
Thanks for the great info guys.
I wish all these online stores were available 30 years ago when my dad started building. It sure would have saved alot of grief in tracking down suitable parts.
Now if only I can convince my work to buy a CNC mill;)

RCLogger
11-22-2010, 10:37 PM
Jordy, I have the Mil-Spec tires on order as well, they are very close in size and width to the ones I have on my ADT now.
This motor would have super power and a nice speed with the size of tire you are going with.. http://www.robotshop.ca/cytron-12v-34rpm-139oz-in-spur-gearmotor.html

greg

TheMachinist
11-22-2010, 11:13 PM
I was looking at the 58 rpm ( Lou sent me a link) motors for more speed but I'm not sure I need it. The tires will be ordered tommorow, and I'll make some decisions about the motors soon.
I was also thinking of a 17 rpm 277 ounce motor to use on the screw drive for the dump box.
I guess I'll have my lunch hours at work filled for the next while making parts and pieces. I have 2 chucks for small parts I can put in and take out of the shop lathes in a hurry without disturbing the work piece.
I also think we just got in 20' of 2 1/2" round aluminum for stock. It's 6061L and is fairly free machining so I'll start knocking out some rims with planetary covers.

ihbuilder
11-22-2010, 11:16 PM
I like those tires even better and as for side wall 2 inserts could be put in side by side.

I just got a set couple weeks ago to look at for another project . just a hair smaller then the tamiya mammoth tires . I like them a lot :D . Yes sometimes a cnc would be nice like when your making a hundred + of the same thing :eek: can't wait to see this 1 started .

IHSteve

TheMachinist
11-22-2010, 11:29 PM
We've been toying with the CNC thing for some time. Last year I got to run a HAAS TM2 at a demo and with the programming and tool setups we were looking at runs of 5 to 10 parts being cost effective. Not to mention the fact that they walked me through programming tool selection and run through of a fairly complex part in 45 minutes without any prior experience (read: I had no idea how to do it). I'd buy one myself but I might wind up divorced if i add any more stuff to my shop.

steamer
11-22-2010, 11:41 PM
Hi Jordy. Just a small piece of advice. Don't waste your money with the slow rpm motor. The motor you saw in mine at Greg's was same 34 rpm as the link he posted. When you think about using 10/32 all thread that's only 1" per minute,and it's way to slow. I upped it to 253 rpm 153 oz,in, same supplier and it will still lift over 30 lb, no problem. And it does it in about 20 seconds, much better. Just finished installing a micro switch on it for the down stop and it's running well. Been thinking about making a bronze nut for it as am not sure how long the furniture nut will last, as it's steel on steel. I covered the screw with heavy duty anti seize, but now it will probably pick up dust. On the plus side it sure runs smoother. :D Hope this helps.
Rob

tracksntreadslou
11-23-2010, 12:07 AM
For steering jordy this is what i used on my ADT.. plenty of torque
http://www.servocity.com/html/spg755a_standard_rotation.html

TheMachinist
11-23-2010, 12:24 AM
Steamer
Thanks for the info on the screw drive motor. I hadn't taken the time to do the math. I'm going to start in on the design work tommorow after I've shovelled all the snow.
Lou
Thanks for the link thats a nice setup for the steering.How do you have it hooked to the articulation joint? I took a quick look at it when we were visiting but am not sure of the connection.

TheMachinist
11-23-2010, 01:32 PM
I think I've figured out a simple system for mechanical cylinders for the box dump mechanism. It will do away with the scissor lift but I'm not sure how it will look on the truck until I make a prototype. Boy I wish I could get all my parts and pieces faxed to me instead of having to wait for shipping:D

tracksntreadslou
11-23-2010, 08:37 PM
Hey jordy heres a few pics of when i was building
http://i181.photobucket.com/albums/x63/tracksntreadslou/004.jpg
http://i181.photobucket.com/albums/x63/tracksntreadslou/007.jpg

TheMachinist
11-23-2010, 08:46 PM
Thanks Lou that makes sense now. Nice and simple.

td9clyde
11-23-2010, 09:31 PM
this is going to be one awsome build i can't wait to see the building and the pics to come

Espeefan
11-24-2010, 12:08 AM
Hey jordy heres a few pics of when i was building
http://i181.photobucket.com/albums/x63/tracksntreadslou/004.jpg
http://i181.photobucket.com/albums/x63/tracksntreadslou/007.jpg

Lou, that looks very clean and is an excellent idea! I'm curious where the large gear came from. If you can't have hydraulic steering, this looks like the next best thing, for sure!

kerst
11-24-2010, 08:52 AM
Wow! Nice construction!

kerst

steamer
11-24-2010, 12:38 PM
Back on post #16, Lou put up a link for the servo.
http://www.servocity.com/html/spg755a_standard_rotation.html.
The unit comes as one piece including the gear and just plugs into your receiver. They use these as the house swing on their excavators too as they support 200 lb laterally. The one Logger uses is 6 rpm.
Rob

Espeefan
11-25-2010, 02:08 AM
Thanks Rob. I didn't actually visit the link. I thought the link was to the servo alone, and that Lou built the rest of the steering mechansim. That is a nice unit.

TheMachinist
12-05-2010, 08:30 PM
Just an update.
No I haven't dropped off the face of the earth. I'm busy waiting for parts to arrive before I start the build.:(
I will update as soon as I have something picture worthy.

Thanks for the great input though I got lots of great ideas.

TheMachinist
02-17-2011, 09:33 PM
Finally. I have my Mil spec tires and motors for the ADT. Now I just have to reorder the Aluminium for the rims as I used it all up on a customers job.
In the mean time I have been busy.
I built a Bruder loader following Smallhauls build thread. I have a new appreciation for the engineering that goes into a project like that. It's not all cut and dried.

533

Lil Giants
02-18-2011, 01:38 AM
Video? :):p

SmallHaul
02-18-2011, 08:30 AM
Finally. I have my Mil spec tires and motors for the ADT. Now I just have to reorder the Aluminium for the rims as I used it all up on a customers job.
In the mean time I have been busy.
I built a Bruder loader following Smallhauls build thread. I have a new appreciation for the engineering that goes into a project like that. It's not all cut and dried.

533

Your loader looks good. Aren't they a blast to run.

TheMachinist
02-18-2011, 09:53 AM
Your loader looks good. Aren't they a blast to run.


Small haul

They absolutely are. I,m going to follow in your footsteps again and build a Tonka dump truck, I just picked up a 1960 Tonka with a red cab and green box from a friend. He had it in his office in a shelf. It even has the origional packaging.

TheMachinist
03-05-2011, 09:30 PM
Finally some progress on my ADT. I got the rims roughed out and started on the drive hubs. Also gathered the material for the rear frame.
http://i1122.photobucket.com/albums/l539/TheMachinistman/DSC06555.jpg
http://i1122.photobucket.com/albums/l539/TheMachinistman/DSC06553.jpg

steamer
03-05-2011, 10:59 PM
Jordy. Your rims look very real. did you copy them from the full size machine.
rob

TheMachinist
03-05-2011, 11:08 PM
Jordy. Your rims look very real. did you copy them from the full size machine.
rob

Yes I did copy them but the bolt flange is a little off of scale because of the electric drives. Once the "planetary" housings are in place they will look pretty close to real.

tracksntreadslou
03-06-2011, 01:14 PM
Nice machine work Jordy..Great to see you get back on the moxy build..Do you plan on using scale bolts to fasten things together?

elliot330
03-10-2011, 05:04 AM
I wonder if the Castle Mamba Monster ESC will power 6 gear motors running a 6S lipo?

Jordy


Hi Jordy,

Nice start on the wheels and the tyres look good as well. One thing, you mention a 6S battery., i assume this is similar to what you use in your heli's. 22volts is very high for ground based vehicle.. it'll be speed demon!

Elliot

TheMachinist
03-10-2011, 10:15 AM
Hi Jordy,

Nice start on the wheels and the tyres look good as well. One thing, you mention a 6S battery., i assume this is similar to what you use in your heli's. 22volts is very high for ground based vehicle.. it'll be speed demon!

Elliot

Yeah 6s would be over kill. I have a Sabertooth dual motor ESC for the drives and will run a 3s pack at 11.1 volts. Now that I see the thread on Robbe hydraulics I might have to rethink the dump mechanism.

Jordy

elliot330
03-10-2011, 10:23 AM
That's similar to me, I'm going to use a 3S lipo with a standard Esc, connected to all 6 drive motors, forgot to add, I only went with standard Esc as I want it to control the lights etc.

TheMachinist
03-13-2011, 08:16 PM
More progress: the hubs and rims are done as is the front axle tube.
http://i1122.photobucket.com/albums/l539/TheMachinistman/DSC06563.jpg
http://i1122.photobucket.com/albums/l539/TheMachinistman/DSC06561.jpg
http://i1122.photobucket.com/albums/l539/TheMachinistman/DSC06559.jpg

9W Monighan
03-13-2011, 08:32 PM
Nice production work.

TheMachinist
03-13-2011, 08:57 PM
Nice production work.

Our shop has an old lathe that nobody uses anymore so I can set up before and after work with out interfering with anybody and leave stuff set up during the day.
The lathe is a 1946 Dean Smith and Grace that is all worn out and really clumsy to operate but it handles the small stuff easily.

RCLogger
03-13-2011, 09:06 PM
Very Nice Jordy
The rims are looking real good, whats next ? What are you going to mount the motors to ?

greg

TheMachinist
03-13-2011, 09:12 PM
I'm working on the chain boxes that make up the rear suspension, they will clamp the motors in place and mount to the frame rails on bearings so they will pivot ( the motors will stick out under the frame but I guess I'll sacrifice the scale look for functionality). After that I'll make the frame rails and the articulation joint. I have all the Oilite bearings on order as well as the 4:40 fasteners. They should be here on tuesday.

TheMachinist
04-03-2011, 08:13 PM
A little more progress:
http://i1122.photobucket.com/albums/l539/TheMachinistman/DSC06564.jpg
http://i1122.photobucket.com/albums/l539/TheMachinistman/DSC06572.jpg
http://i1122.photobucket.com/albums/l539/TheMachinistman/DSC06571.jpg
http://i1122.photobucket.com/albums/l539/TheMachinistman/DSC06570.jpg

td9clyde
04-03-2011, 08:19 PM
lookin good can't wait tp see it working

SmallHaul
04-03-2011, 08:23 PM
Looks good, Nice work.:)

sparkycuda
04-04-2011, 09:35 AM
Nice job on the tandems. I don't think the motors are too obvious and your design is clean and well made. Should have great power with six motors to haul the dirt! Looking forward to seeing this one move.

Ken

kerst
04-04-2011, 09:41 AM
Nice!

Kerst