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silly question about loads and weights
blakep82 - 22/2/10 at 02:41 PM

just want to be sure before i make a lot of damage....

fully built race trucks are ballasted to about 885kg for racing. mines not finished, so many of the parts aren't attached and the car's not ballasted, but assume some of the parts i've used are heavier, lets assume its 850kg now (which i doubt)

i need to get my axle off to paint, and with this weather, will probably take a few days to dry properly. i won't want to put the axle on til its dry. i need the car mostly out the garage to paint, then pull it back in, with no wheels, at night

my crane is rated to lift 2 tons (on minimum jib extention, but 2 ton none-the-less)

can i happily sit my chassis on the legs of the crane to use like a trolley to push it about the garage? or will i do some damage and break something doing that?

[Edited on 22/2/10 by blakep82]


Miks15 - 22/2/10 at 03:13 PM

Will your front wheels still be on? I cant see any problems with it aslong as you
a) protect your chassis so it doesnt get ruined
b) mabye strap the chassis to the crane so it doesnt slide around on it

As long as its only replacing the back wheels and not going round corners etc i cant see any problems


blakep82 - 22/2/10 at 03:27 PM

front wheels might be easier coming off actually. given the ride height and suspension travel, i don't think they'll be touching the ground anyway lol out the front of the garage, there's a bit of a ramp, then a step, about 25mm i think. could cause difficulties with the wheels on the car, and definitely a problem with the wheels on the crane. still, if i can get it to the edge, it gives me about half the garage for spraying room

strapping down, i'd wait and see how it is first. its a big ol' car, and a big ol' crane. its legs are 1.3m long and the car is about 1.8 wide. don't think it'll need strapping, its a question of how the crane deals with the load. does the full 2 tons go through the wheels?


russbost - 22/2/10 at 06:50 PM

Blake, IMHO there should be no probs whatsoever with the weight on the wheels of the crane - if the cranes rated to 2 tonne would expect the wheels to survive double that & you're highly unlikely to be putting more than half a tonne on them at worst. Far more trouble going up & down kerbs tho'!!


indykid - 22/2/10 at 07:33 PM

it's the extension on the jib and the ram/hinge attachments that determine the rating of your crane, hence the rating decreasing as you extend the jib.

the base will be absolutely fine
tom


MikeR - 22/2/10 at 07:57 PM

its fine - but, you've only got it sat there - it will slide off if you're not careful and the front wheels won't control the direction that well due to the rear not being secured.


Peteff - 22/2/10 at 08:27 PM

Has it got steel wheels on the front like mine ? If so it will cope easily. I shove my car round on a supermarket bread trolley balanced in the middle on some 3x2 and it goes wherever I want, you can spin it in it's own length.


blakep82 - 22/2/10 at 10:18 PM

awesomeness lads! sounds fine then

to answer some of the questions:
2 ton is 2ton no matter how the hinge/jib deal with it, if you lift 2 ton, its still going through the wheels, so the base should be fine as you all say

Mike, the front wheels ideally will be off if they are easy enough to do. i should in theory, be able to lift the whole car, and balanced properly too, if the crane is attached to the roof. also, with the jib at 1-1/2 ton extention, it should meet the middle of the roof. 1, will help it stop sliding off if attached, and i should be able to lift it to remove the wheels if they drag.

pete, they are steel wheels, they are 3" diameter i think? but my floor is quite lumpy come to think of it.... might be difficult to push about, but its only while i paint the axle so shouldn't need pushing about too much


indykid - 22/2/10 at 11:21 PM

quote:
Originally posted by blakep82
2 ton is 2ton no matter how the hinge/jib deal with it, if you lift 2 ton, its still going through the wheels

i think you missed the point of what i said.


blakep82 - 22/2/10 at 11:46 PM

quote:
Originally posted by indykid
quote:
Originally posted by blakep82
2 ton is 2ton no matter how the hinge/jib deal with it, if you lift 2 ton, its still going through the wheels

i think you missed the point of what i said.


yep, i understand what you said i was originally thinking that the shape of the jib etc would have some method of spreading loads, but no matter what you lift, the base and wheels have to be able to hold at least the capacity of the moving parts.
i know i can't lift 2 tons on max extention, but if it can lift 2 tons on mionimum extention, then the base has to be able to carry 2 tons regardless


MikeRJ - 23/2/10 at 12:36 AM

The front wheels carry the vast majority of the laden weight of the hoist.