Custom boom truck with aluminum body.

[Lumberjack]

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But this:

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ton/meter ratings are rated differently than straight boom Ton rating.

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confused me.

Does this mean that metric ton ratings are different from straight, boom Ton ratings 'straight, boom Ton ratings' being what you referred to as standard ton?


This also confused me:

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36k lbs (18 Tons) next to the truck, a 40 Ton crane can lift around 40 tons at the same/similar minimum radius.


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A 40 Ton crane can lift 40 tons--did you mean a 40 Ton crane can lift 40 Tons??



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The first part Mark answered. As a stick boom gets closer to horizonal, its chart looks closer and closer to the knuckle booms, but up close the knuckle looses out. And yes a standard ton is 2k lbs, a metric ton is 2.2k lbs. Kinda like a standard wrench is a fraction, metric is in mm.


The second part, yes, I tried my best to keep my t and T's right, but I missed one! Thanks for correcting that.

 

[Lumberjack]

Re: Metric ton conversion

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Thanks Tom. I understand the conversion. What I don't understand is this:


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However, at larger radiuses, the charts come closer together.

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from Lumberjack's post.

The conversion should always be the same regardless of the radius.

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Did we get this explained well enough?


Mark, your boom should be able to lift it, but the winch would require multi part lines and blocks, which would be deducted from your capacity, but I dont see why it couldnt lift its full potential as long as the boom is kept short, the tip sections wouldnt take the weight of course.

 

[Mark Chisholm]

Re: Metric ton conversion

I'm not really thinking of adding the cable. I like the truck the way it is. Infact, I used it yesterday on a clearing for an addition and moved felled trees from 80' away from the chipper and put them right in. Enabled my crew to make 100yrd.s of chips by 2:30. /forum/images/graemlins/grin.gif

 

[Mangoes]

Re: Metric ton conversion

Ton : ton confusing
Ton : tonne much less confusing
Ton : Tonne still get the gist
T : t room for misinterpretation

Truckers up here often say Ton 'tun' and Tonne sounds like 'tone'

 

[Lumberjack]

Re: Metric ton conversion

Good point Mangoes. Ton and tonne is much better.

 

[MikePoor]

Re: Metric ton conversion

to further open this "can of worms" , I found when shopping for my 2nd crane that tonne meter ratings vary greatly w/ each different manufacturer and depending on which configuration of boom extensions you use. I decided on my effer 55 tonne because it picked more at 100' radius than other 68 tonne and 75 tonne knucklebooms I looked at ( p.m. 68 t/m & hiab 75 t/m) and the effer 550 weighed a few thousand lbs. less allowing the use of single front axle!

 

[Lumberjack]

Re: Metric ton conversion

Oh, and thanks for the complement Mike!


Effer does seem to have a high strength to weight ratio, whats the GVW of your truck and the tare weight/net payload?

 

[Gus]

Re: Metric ton conversion

Ahhhhh the old Ton/Meter question /forum/images/graemlins/grin.gif.

To keep it simple 1 metric ton = 2,204 lbs
1 meter = 3.281 Feet


So lets say you have a knuckle boom that's rated at 30 Ton/Meter it should theoretically pick 66,120 lbs at 3.281 feet. Now you would never be able to actually pick something that weighs 66,120lbs at 3.281 ft because the design of knucklebooms makes it physically impossible but the manufacturers had to find a way to rate this type of equipment and this is how they did it a long time ago and it's stuck ever since.
If the time comes for you to purchase a KB ask yourself this and you'll be fine - "How much weight do I need to Pick....and how far away do I need to pick it?", and try to think Horizontal picks not Vertical.

And on a side note.....try not to get too hung up on boom "Brand Names". Most of todays booms use the exact same steel and similar if not identical components. For instance we sell two different "Brands/manufacturers" of knucklebooms and they both use the exact same Valve Block and the exact same radio remote. Both manufacturers have certain models that are better then the others. In other words there is not a single manufacturer out there that can claim (honestly) that their full model line is superior to everyone elses.

 

[KTS]

That is one VERY nice knuckleboom!!

 

[Gus]

Hey guys,

Here is an 80 Ton/Meter PM that we recently sold to a Crane rental Co in NY.

The truck had to be a Tandem Steer due to the extra weight of such a large crane.

 

[Gus]

And another shot....



Love the big Iron.

 

[Mark Chisholm]

Wow, that is nice.I want one Gus! Two cylinders on the fly jib? So, how much?

 

[Gus]

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Wow, that is nice.I want one Gus! Two cylinders on the fly jib? So, how much?

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4 hydraulic extensions on on this jib Mark. The other neat feature is you can operate the outriggers from the remote control and the radio has a digital weight meter display so you always know well before your crane goes into overload.

 

[MikePoor]

Nice 80 ton Gus! What is the horizontal reach on that? I bet it does some seriuos lifting in the 70-80 ft range. And of course what does that rig cost?

 

[Mark Chisholm]

Gus,

I meant the two cylinders under the jib instead of one. That must be stronger like that?

I used an 80 ton in Norway when I taught a crane removal workshop in May. Here's a pic of it. It had the same luxuries

So, how much?

 

[MikePoor]

How ya' doin Mark Chisholm? Again congrat's on your climbing in HI! (Your footlock is insane!) Do you have more photos from Norway? (I might have missed them if you posted them earlier)

 

[Tom Dunlap]

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I used an 80 ton in Norway when I taught a crane removal workshop in May.

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How come all of the Scandinavian pictures I show EVERYONE wearing rain gear? Ha ha ha!

I'm teaching a couple of SRT workshops in Sweden in October.. my Marmot rainsuit is already in the bag!

 

[Mark Chisholm]

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How come all of the Scandinavian pictures I show EVERYONE wearing rain gear? Ha ha ha!


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Hahaha! It was raining (ask Svein).

Mike, I only have a few of the crane day because it was raining so much. The second day was rigging and it was a much better day for photos.

Here's one from the distance. You can see the port in the back. This was an Ash that grew from about 30' lower than the where the crane was set because of all of the hills there!

 

[Mark Chisholm]

Here's a shot of Svein and Brian (did the training with me). By the way, this was taken in May.

 

[MikePoor]

Beautiful photo of the port. Nice crane. Did it have a winch? (There is a drum on the lower boom - commonly used to mount winch lines on k-booms.) I noticed it has both hose reels & hose tracks (the reels are a pain around brush) Nice tree to demo spider legs & tag/but lines! Ash some times get "gangly" and brush picks can be tough to balance (did one yesterday, i'll post pic's sometime) From the looks of that last photo Tom better pack a parka & snow shoes!!!