Liebherr LTM 1030-2

[texken]

Does any one know where to find metal for the Telescoping Boom?

Aluminum Square would work also.

Scale 1/25

Texken
New member

[9W Monighan]

Check the K&S site. You will no doubt have to machine one down to fit inside another unless you can install nylon bushings to tighten them up.

[mog]

i would make shere that i would use some thing like nylon as 9W said. if you have aluminum on aluminum it will gull up in no time flat a steel one and aluminum core would work fine but aluminum dose not like rubbing on it self and you will be stuck with a big mess in not time i found this out the hard way. i eavin whent as far as too try lube like graphit spary and just about evey thing els i could think of steel on steel works the best that what some of the real picker use.

[9W Monighan]

If you can anodize the aluminum parts they would slide better. But not real well for very long unless it was a hard coat,meaning the temperature of the water it was anodized in and length of time. (don't mind me I was just rambling):D

[texken]

Thank you, good on nylon

[texken]

K&S two small I looked but thank you

[tracksntreadslou]

You may be able to add small rollers on each end ...I would check your local metal recycling depot..Some will have an area that you can shop in ...I find very many and different profiles there and at scrap prices

[doodlebug]

http://eaglemouldingsinc.com/TubingSquareRectangularRound.aspx

Somebody else posted this link the other day, any help to you?
Later, Neil#2 aka doodlebug.

[texken]

Hi doodlebug, wow think I went to heaven.

I think I found my boom
thank you,
ken:)

[doodlebug]

Yer Welcome!

[texken]

doodlebug
need to be sitting for this.
Eagle only sell 24' long tubing.
Went to ALLMetals, got steel tube.
Was nice you tried to help, thank you

texken

[doodlebug]

Hey texken, I found this outfit in Live Steam magazine. No minimum?
Later, Neil#2 aka doodlebug

http://www.speedymetals.com/c-8364-rectangular-tube.aspx

[texken]

Thank you.
Will look

texken:)

[steamer]

Here's another link and they sell in four foot lengths
http://www.brunnerent.com/Tools/Portfolio/frontend/itemlist.asp?reset=1&type=6&lngDisplay=0&iPageView=0
Rob

[9W Monighan]

Here's a link from another forum showing what the insides look like. As you can see it's pretty complicated to make a telescoping boom.

http://forums.dhsdiecast.com/default.aspx?g=posts&t=128642

[texken]

Well with help, have found telescoping boom, wheels, and how to mount crane to chassis.

Now need how to raise boom, no hydro way.

Found motors for swing, and winch. Also for boom extension.

Your helping was great, thank to all. Input welcome

TEXKEN

[ihbuilder]

Ken , Are you going to make this a build thread ? If so do tell so we can move it to where it belongs :) it is in the wrong place if it is . it'll be great to see more crane builds :)

IHSteve

[texken]

Yes please move to better place.

TEXKEN(ken)

[texken]

Well I layied the Keel Sorry I have built to many RC ships. I meant Chassis to day.
Aluminum deck, will have Aluminum Crane.
So will slowly start working on other parts.
Found Telescoping boon, still no wheels, need to be small hub, 4 1/2 in tires.

Will be using Chaseracer's system to raise the boom, just motor on other side.
If it works will share. LOL

Later,
TEXKEN Ken

[texken]

found wheels

texken

[Roadmasters]

Where are the pics???

[texken]

Here are the photos I hope.
texken

[scalecranes]

Looks like you're off to a good start Ken. Where did you end up getting wheels from?

[texken]

wheels from du-bro. Big Wheels, smooth inflatable with positive seal air valves , plus rim has 5 bolts look.
Hope they work.
hard to find race car tires that are 4".

[texken]

Getting wheels from Du-Bro.
Smooth

big wheels with air valve.
Rims has 5 bolt looks.

How is you Crane going?

Texken

[texken]

More done today
still need to trim back deck.
need to get the screw cylinders for jacks.

[scalecranes]

Looking good. Have you thought about what you're going to use for a winch motor yet?

[texken]

No on winch.
Was looking at the winches they use on 4x4 jeeps.
Or just make one up.

Texken

[Southgate]

The "keel" is looking good so far, Ken. Lots of heavy metal coming up, huh? Dan

[Southgate]

Ken, (and others following) I googled the crane numbers to see what we're looking at. Here's a link:

http://www.liebherr.com/AT/en-GB/products_at.wfw/id-3657-0/measure-metric

Dan

[Jared]

No on winch.
Was looking at the winches they use on 4x4 jeeps.
Or just make one up.

Texken

I would think about using servos modified for continuous rotation. All you have to do is plug them into your receiver and they will operate just like a hydraulic winch. Modifying them is easy, but I'm not sure if you can modify all of them. Metal gears are good and double ball bearings are a must. I think Smallhaul or Stuff knows where to get servos already set up for continuous rotation.

To chose a servo, just figure out how much weight in ounces you want the winch to pull, then multiply that by the radius of the core of your winch drum and that will give you the inch/ounces of torque required and then chose a servo that has at least double the torque (a little is good, a lot is better) so you don't burn it up. If you want to lift 320 ounces (20 lbs) with a four-part line, then you need a line pull of 80 ounces. So, if your drum core is .75" diameter, the radius is .375"; then 80 X .375 = 30 in/oz required so you need a servo capable of at least 60 in/oz.

And to make sure it has the right speed, take the time/60 degree rotation spec and multiply by six and then divide 60 by that number to get rpms. If a servo has a .18 second for 60 degree rotation, then .18 X 6 = 1.08 seconds per revolution. 60 divided by 1.08 = 55.55 rpms. Since the drum core has a diameter of 3/4 inch, the circumference is 2.35". 55.55 rpms X 2.35" circumference = 130 inches/minute of line speed.

You probably already know how to do the math, but if anyone else wants to know, that's how I do it.

[texken]

Thank you for the info Jared.

finished the head rig

Paint will be nice LOL

TEXKEN

[texken]

Still need to clean it up.
ken

[texken]

up dates
Working on Chassis driver cab.
Working on doors.
Some one said to you Plastic weld, then Exposy to hole nylon hinges.
Well seem to be holding

TEXKEN

[mog]

well i figger out my boom for my crane and it truns out you can get steel tube from any local steel place. if you get .100 squar tubing it works great. but that might be too heavy for your crane. 1 1/2 goes in to 1-1/4-1-3/. 3/4 come's in .065 wall so your will have to shim the 1/2 if if you need that size. good luck

[texken]

Hi Mog, found the SQ tube, in All.
Also now know how to extend boon together like the real ones.
Made a wood model, used the Liebherr way on their home page.

TEXKEN ken

[texken]

OK found tires/wheels, found boom, working on boon mechanizes for raising boom.

Still meed to get two more tires/wheels (on order) for back, and motors to drive them.

I now know how to make the boom sections work, made it Out of wood to make sure. Will work like the real one.

Should have photos soon.

Now need to find a sound system, so when lifting something I get the sound, any input??
Just crane sound running, then speed up when raising boom, or lifting.

Later,
TEXKEN

[texken]

Getting their, little by little
Receiver my last three tires today.
Also have outriggers getting their.
Have boom lifting cylinder almost, still need a good motor, any USA store and what size to get?

OK, found the 4" tires, love the pet store LOL LOL

Texken Ken

[kerst]

Looks nice!
Check eBay for motors, there is usually a good choice.

Kerst

[doodlebug]

Hey texken, you can try www.surpluscenter.com have them send a catalog, see if any of the 12dc stuff will work. http://www.surpluscenter.com/sort.asp?keyword=GIDD&catname=electric&PAGELEN=10000 Not the entire collection, but give's you idea's. Later, Neil#2 aka doodlebug.

P.S. http://www.surpluscenter.com/sort.asp?catname=electric&keyword=MCDD

[texken]

thank Kerst and doodlebug, will check.

Ken

[texken]

Photos of Screw Jack with pads.
Also Mirrors and Small right door mirror.

[scalecranes]

Looking good Ken. Makes me want to find some time to work on my crane.

[texken]

All done so far.

Just added graded steps and bumper with block hook.

Still have to do some paint touch-up.

TEXKEN

[texken]

http://s1214.photobucket.com/albums/cc500/texken42/

My photos

[texken]

Think I have my Slewing found.

[JensR]

Is that bolt hollow?
Are you not transmitting any lines between top and bottom?

[texken]

Hi JensR, No wires going threw.

Chassis is powered and the Crane is powered.

Tried all ways, then found this.

TEXKEN

[JensR]

Okay, that works, too.
Do you use an FM radio?
For 2.4GHz, you will have to make sure that you can bind to two receivers at the same time (don't think this works) or switch models (computer transmitter) between chassis and crane (probably better).

EDIT:
Have to correct myself:
http://www.helireviews.com/fly-sky-fs-th9x-9ch-transmitter/
Unless your 2.4 GHz transmitter behaves differently, this means that the transmitter will always send the same code and so different receivers (chassis and crane) will all listen to the same signals. You could still have signals 1-3 in the chassis and 4-7 (or so) in the crane. Hope this makes sense.

As to your design:

I do not see how you fix the gear to the chassis.

How is the bearing held in position?

I do not see how you deal with the axial loads.
The axial bearing should have a large diameter to create a stable platform.

What is the flange bearing in your drawing? The large plate?
I don't understand.

Cheers
Jens

[texken]

Hi Jensr, OK the flange bearing has 2 bolts to bolt to chassis. (see drawing)
from under the chassis, with 3/4 sticking threw the crane deck which turns.
Gear will be screwed around bearing, on the chassis and motor with pinion gear to swing crane.

I think the bearing will work OK, with counter weight.

So what radio should I get. 6CH should work.

TEXKEN

[JensR]

I saw the drawing - I don't understand it.
Are the parts labelled be(a)ring and the one labelled flange be(a)ring one and the same?
If so, this would theoretically work, but you need to be sure that the upper part interacts with the inner ring of the bearing and this will mean that your base for stability has a very small diameter. Not good.
Also, I do not know of any flange bearing with a flange that much larger than the bearing itself.

If however, these two parts are really two parts, I really don't know what we see here.

Which radio? Depends on what you want to control. 6 channels could be not enough if you want to control the outriggers in certain ways.
I'd recommend the Turnigy 9x v2, which is a 7.5 channel radio.
1 drive forward/reverse
2 steer left/right
3 boom angle
4 hook up/down
5 rotate left/right
6 outriggers out/in
7 outriggers down/up
half channel: driving light/working light

[texken]

Here is Bearing
top piece plate removed. Bottom plate bolted to chassis bottom to hold
Only the gray piece will be sticking thought so crane deck can be bolted to bearing.

[JensR]

Ah, cool. Yup, that should be much better than what I thought:
I have never seen one of these units with such a thin flange, only units with massive cast iron housing or tiny bearings where the outer ring has a flange/lip on it.

Pretty neat, will have to remember these

[texken]

More pic when put together.

Ken

[9W Monighan]

Those Flanged bearings will take up too much room. I forget what Tom used on his Marion shovel.
Look these over for some ideas.
http://business.shop.ebay.com/Business-Industrial-/12576/i.html?_nkw=slewing+bearing&_dmd=1&_frs=1&_sop=15&_trksid=p3286.c0.m359

http://business.shop.ebay.com/i.html?_nkw=kaydon+bearing&_sacat=12576&_sop=15&_dmd=1&_odkw=kaydon&_osacat=12576&_trksid=p3286.c0.m270.l1313

http://cgi.ebay.com/350mm-Lazy-Susan-Round-Table-table-Bearing-400-Turn-lbs-/400139642817?pt=LH_DefaultDomain_0&hash=item5d2a2e67c1

[JensR]

I don't really think anymore that the ones Ken found are too bulky. The lower part will sit flush in the chassis and the upper needs to bridge the thickness of the gear and then the crane needs to be attached to it. If anything, that hollow shaft of the bearing unit might not be long enough...

A very simple and compact thrust bearing is a plastic disc with many 4mm holes drilled in a circle. Put bearing balls into the holes and trap everything between two planar disks of sheet metal. Does not provide radial location of the shaft, but a huge support base axially.

[texken]

Thank you for the input.

Will try and make it work.

Ken

[Hanson50]

Comment on your Radio for your crane. I am dealing with simulary application with my Crane Build, (Potain Crane Build). I am using a 8 Channel radio with 2 Receivers. I use one channel ( a toggle switch) to electronicly switch between one or the other set of funcition. Each receiver will read the signals but if the servos or motor are not powered, nothing happens.
Paul H. Hanson

[ihbuilder]

Those Flanged bearings will take up too much room. I forget what Tom used on his Marion shovel.
Look these over for some ideas.
http://business.shop.ebay.com/Business-Industrial-/12576/i.html?_nkw=slewing+bearing&_dmd=1&_frs=1&_sop=15&_trksid=p3286.c0.m359

http://business.shop.ebay.com/i.html?_nkw=kaydon+bearing&_sacat=12576&_sop=15&_dmd=1&_odkw=kaydon&_osacat=12576&_trksid=p3286.c0.m270.l1313

http://cgi.ebay.com/350mm-Lazy-Susan-Round-Table-table-Bearing-400-Turn-lbs-/400139642817?pt=LH_DefaultDomain_0&hash=item5d2a2e67c1

Steve I need 1 3" in dia great links :)

[texken]

Those Flanged bearings will take up too much room. I forget what Tom used on his Marion shovel.
Look these over for some ideas.
http://business.shop.ebay.com/Business-Industrial-/12576/i.html?_nkw=slewing+bearing&_dmd=1&_frs=1&_sop=15&_trksid=p3286.c0.m359

http://business.shop.ebay.com/i.html?_nkw=kaydon+bearing&_sacat=12576&_sop=15&_dmd=1&_odkw=kaydon&_osacat=12576&_trksid=p3286.c0.m270.l1313

http://cgi.ebay.com/350mm-Lazy-Susan-Round-Table-table-Bearing-400-Turn-lbs-/400139642817?pt=LH_DefaultDomain_0&hash=item5d2a2e67c1

I only have 4-1/4 " on Truck bed

TEXKEN

[texken]

More up date.
Received my (2) 1000 RPM motors from China today.
Also had to make my hubs, as no one had any for 4mm shaft,(that I could find).

So will see how they work as soon as I find some way to mount then to Truck.
Any input welcome. Did see some on line, look like a block with hole for motor.

TEXKEN (ken)

[JensR]

Do you mean 100rpm by any chance?
The hubs look good!
Brass tube with brass collar? Collar drilled and tapped?

Attaching motors:
press into plastic tube
glue into other tube
screw into mounting holed on front surface of motor, angled metal plate
use hose clamps to secure motor on metal/plastic profile
...
?

[texken]

JensR, Set Screw.

Thank you for the input, on mounting.

Two Motors for $14.98 shipped, they are 1000 RPM's.

They test fun good on 4-AA.

Will see how it goes. LOL

Ken

[texken]

Rear Drive

[texken]

Drive Wheels

[JensR]

Looks good!
So you make "only" the front axle steering?
Sorry to repeat myself, but I am slightly concerned about the motor being billed as "1000rpm". That sounds quite high and I would have expected (as I said earlier) 100rpm to be more realistic - but if you have done the tests and it works, that's great!

Also, what scale is this?
The first post says 1:25, but this looks bigger?

Cheers
Jens

[texken]

Well, maybe 100.
Rear drive only.
Will be 1/14 scale. Used info from member to find size.

Thank you for looking.

TEXKEN

[texken]

How have Wheels.
Waiting for steering servo.
Need radio, any good input for a radio to run chassis and Crane with one radio??

TEXKEN

[texken]

Need radio, any good input for a radio to run chassis and Crane with one radio??

[JensR]

Looks good with paint! :)
I wrote this previously regarding radios:
http://www.rctruckandconstruction.com/showpost.php?p=27745&postcount=49

[texken]

Crane up and running.
Need to get the gray paint.

Now can start on the Crane.

[texken]

Now have working chassis.
Will get the gray paint, then start on Crane.

http://www.youtube.com/watch?v=8GzfuSqA9Jo

TEXKEN

[texken]

http://www.youtube.com/watch?v=8GzfuSqA9Jo

[JensR]

This sounds as if you are barely using the throttle?
That crane is going to be fast ;)

[texken]

Yep..... Will need power when Crane is mounted.

Ken

[JensR]

Power is proportional to speed times force.
So, for a given power: If it is fast, then it is weak.
I'm a bit worried that you indeed might have the 1000rpm motors, in which case you won't be happy, I fear.

[texken]

Thank you for input.
Well can be changed if needed.
Ken

[texken]

Test of Turntable

http://www.youtube.com/watch?v=qpIryYnZUzQ

[JensR]

Seems to run really smoothly!

[texken]

Hi JensR, thank you for the comment.
Should be better with a speed control.
Ken

[texken]

New photos
Photos of operators cabin, wench, boom lifting cylinder with servo, and boom sections.

Will be using the cable set up like the real machine.to extend the 2 section boom.

More later

Ken

[texken]

boom lift cylinder

[JensR]

That has come along nicely!
Do you already know how much that servo can lift?

[texken]

Hi JensR, not yet,
Will be a thread rod.
Will be sure to let you know. LOL LOL or go to plan "B"

Ken TEXKEN

[texken]

This is how I will extend the two boom sections (1 and 2)

Will be by cable.

TexKen

http://www.youtube.com/watch?v=opUUDZKuYi4

[Rebekah_harper]

Need radio, any good input for a radio to run chassis and Crane with one radio??

Hiya,

Have you thought about a DX8 spektrum.

8 channels and model select. This is when you change the model program on transmitter it will select the reciever you bound to that program.

Which means you can have 3 separate servo circuits with 8 channels each.

1: Truck
2: Legs/stabilisers (allows for individual motion)
3: Crane. (means no need for cables or contact disk for power/control up the centre.

[texken]

Thank you for the info Rebekah