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DaveDCB
Well-known member
That’s what I hire in, always seems alrite, just never see many forsale 2nd hand.
doobin
Well-known member
I see bomag do some. But compaction force for the front drum is the same as a double roller, which of course has the rear drum. So how are they better?
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Smiffy
Well-known member
If you check the specs they have a higher static pressure for the width of the drum. The depth of fill they can compact is greater. The output of M3 material per hour is greater. They have a lower centre of gravity. Can be fitted with tractor tyres to stand a better chance of extracting themselves. And they can be interchangeable between sheep's foot and smooth drum so can compact clay. And vibration frequency of the single drum is 40hz as opposed to nearly 70 of a twin drum and an amplitude is 1.7mm on a single drum and 0.5mm on twin drum. And the centrifugal force is over double on the single drum. So different vibration characteristics.
It's not that a twin drum roller won't work. It's just the single drum is designed specifically for aggregate and soil. The twin drums are designed for asphalt.
Giles
Well-known member
I tried to find a roller attachment that would maybe fit on the Avant. It must be doable it'll lift nearly 2 ton so a roller being pushed with a hydraulically driven vibrating drum should be possible. Mind you I know nothing
I’ve a sheep’s foot roller that was on my bobcat, been meaning to mount it on something else.
Giles
Well-known member
We have a benford tv 800 -1
Has been handy over the years but loads of niggles and electrical gremlins had it from near new but its50/50 if it’ll work for you when you get it out the yard. Does live outside though, they’re horrible to drive over rough lane or yard etc and compaction is not what you’d think but can cover a big area with them. Sunk it a few times though in over thick wet mot and you end up with a soft spot, but that can be sorted with tighter layers and dry stone. Every time do a bit of asphalt it’s a 30 min faf with airline trying to get water to drums working.
The big 750kg whacker laughs all over it on compaction and safety if on any kind of slope etc just need to walk and fight it to steer rather than sit with a joystick
Hired a few bomag 120/130s and they’re very nice
Always fancied one of the little rammax sheep’s foot for fill work but not had a big cut and full Menage etc for a while.
Has been handy over the years but loads of niggles and electrical gremlins had it from near new but its50/50 if it’ll work for you when you get it out the yard. Does live outside though, they’re horrible to drive over rough lane or yard etc and compaction is not what you’d think but can cover a big area with them. Sunk it a few times though in over thick wet mot and you end up with a soft spot, but that can be sorted with tighter layers and dry stone. Every time do a bit of asphalt it’s a 30 min faf with airline trying to get water to drums working.
The big 750kg whacker laughs all over it on compaction and safety if on any kind of slope etc just need to walk and fight it to steer rather than sit with a joystick
Hired a few bomag 120/130s and they’re very nice
Always fancied one of the little rammax sheep’s foot for fill work but not had a big cut and full Menage etc for a while.
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Steve
Well-known member
Every day is a school day.
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DaveDCB
Well-known member
Think we are all getting a little muggled, smiffy is talking about the all out soil compactors - which are the ones you can swap tyres/drum shells over on. They start at about 4 ton.
The run of the mill asphalt compactors what local hire centres rent out are non swappable - which is what I’m on about.
Two different machines entirely..
Giles
Well-known member
This type
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Furniss
Well-known member
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DaveDCB
Well-known member
Can’t swap the roller shells over on that one though! They use rubber versions like that for surface dressing and I presume also for steep gradients on asphalt.. had to winch afew rollers up driveways with old tarmac gang I used to work with!
doobin
Well-known member
Those are the 'towable' type I thought @Smiffy was referencing, and the kn on the specs is the same for the front drum as on the twin drum version. So not much point as far as I can see.
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Smiffy
Well-known member
On the bomag website if you check the static pressure of the equivalent drum widths then the single drum is higher (13.2kg/cm² for a single drum, 11.3kg/cm² for a twin drum )
The single drums are also heavier than the same width double drum.
The vibration characteristics are also different.
The vibration works that as the particles vibrate together it reduces the friction between the particles allowing the weight to compact the material further. However this relies on the vibrations matching the resonant frequency of the material being compacted. The twin drums are optimised to vibrate at the correct frequency of asphalt. The single drums are designed with the correct frequency for soil and aggregate. I think some of the single drums even have settings for vibration frequency depending on what you are compacting.
Gunners
Well-known member
Weight isn't everything with compaction @doobin there's quite a few different factors to achieve compaction depending on the type of material and the moisture. @Smiffy showed a chart on a thread somewhere on here that showed what he's trying to explain about static pressure, drum diameter, vibration frequency etc and how that all affects compaction. And also the difference between compaction and consolidation for which I admit I am a bit rusty on.
One roller doesn't do all situations, but you can do lots with an 80. Sometimes its easier to use the big plate, but for larger areas the 80 will do it faster, copes with wet material better, and can also do tarmac. Its even had a few hires rolling cricket wickets
Cant do that with a wacker plate!
The JCB one has been alright, only issue I've had with mine is I blew the water filter housing out of it when we had that week of -5 a couple of years ago, but that was my fault, I know where to drain it all down now - emptying the tank isn't enough!
The only issue you have with an 80 is they aren't great for stability. But that's the compromise for manoeuvrability I guess. Like many others on here, I really wanted a 100 on an 80 chassis (JCB do 100's on the 80 and 120 chassis depending on what you're after) but the price was nearly as much as a standard 120 and that was too big so went with the standard 80 in the end.
Its a machine that doesn't get used much but when you need it, its there and soon saves on hire costs. Just don't buy a new one - they depreciate like a stone under water as I've discovered recently, so this one will be staying with me for many years to come
I'd love a proper soil compactor single drum one someday but as others have pointed out - the jobs just don't come up often enough.
One roller doesn't do all situations, but you can do lots with an 80. Sometimes its easier to use the big plate, but for larger areas the 80 will do it faster, copes with wet material better, and can also do tarmac. Its even had a few hires rolling cricket wickets
Cant do that with a wacker plate!The JCB one has been alright, only issue I've had with mine is I blew the water filter housing out of it when we had that week of -5 a couple of years ago, but that was my fault, I know where to drain it all down now - emptying the tank isn't enough!
The only issue you have with an 80 is they aren't great for stability. But that's the compromise for manoeuvrability I guess. Like many others on here, I really wanted a 100 on an 80 chassis (JCB do 100's on the 80 and 120 chassis depending on what you're after) but the price was nearly as much as a standard 120 and that was too big so went with the standard 80 in the end.
Its a machine that doesn't get used much but when you need it, its there and soon saves on hire costs. Just don't buy a new one - they depreciate like a stone under water as I've discovered recently, so this one will be staying with me for many years to come
I'd love a proper soil compactor single drum one someday but as others have pointed out - the jobs just don't come up often enough.
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kato512
Well-known member
There's a stolen recovered jcb with drive issue in auction
www.gavelauctionsonline.com
2014 JCB VMT260-120, 1011.6 hours recorded. The machine is stolen and recovered. Its identity
V8Druid
do it as well as you can,but learn to do it better
sat in @Lancs Lad 's turfThere's a stolen recovered jcb with drive issue in auction
2014 JCB VMT260-120, 1011.6 hours recorded. The machine is stolen and recovered. Its identity
'nother interesting one from Gavells
SALVAGE - 2020 JMG MC25S Electric 2.5T Crane, Hours: 33, The machine starts runs and operates
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DaveDCB
Well-known member
Had this old 138 on hire .. reminded me that a 80 won’t really cut it for the kind of jobs I do. Think I’ll keep a look out for a tidy 120 that I can legally tow to site.
V8Druid
do it as well as you can,but learn to do it better
pretty 'top heavy' on all but flat ground
Giles
Well-known member
Dave’s on Cheshire plains, apart from Lincolnshire or Norfolk doesn’t get much flatterpretty 'top heavy' on all but flat ground
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DaveDCB
Well-known member
To be fair if I can’t level stone well enough that I don’t flip a roller over on it I should give up after 20+ yearspretty 'top heavy' on all but flat ground
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