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De-stoner comparisons<br />
Do you search the web or reach for the<br />
stars? Confused? We hope not, but<br />
putting de-stoning into perspective<br />
should help:-<br />
25 years of de-stoning experience is<br />
reflected in the types of machines that<br />
<strong>Grimme</strong> offers in today’s demanding<br />
market place. With ever closer examination of<br />
all costs, this very important operation for the<br />
majority of <strong>UK</strong> growers has to be done<br />
correctly, whether it is the need to remove stones<br />
or clod or both from the prepared bed.<br />
Machine<br />
Types<br />
<strong>Grimme</strong> offers<br />
three separator<br />
systems within<br />
the de-stoner<br />
chassis to give<br />
the grower a<br />
solution that is<br />
tailored to<br />
individual needs.<br />
1: Star and Web 3: All Web<br />
This layout consists of share, intake<br />
roller and 7 rows of stars followed by a<br />
web. The star spacing has to suit the<br />
requirement and so does the web. The<br />
star system also offers the optional<br />
facility to increase separation by<br />
altering the relative height of 3<br />
alternate star shafts within the bank of<br />
7. This feature is extremely useful where<br />
the machine works in varying soil types.<br />
This layout is preferred where declodding<br />
is the norm. The more stars in<br />
a machine, the more separation can be<br />
achieved. However, <strong>Grimme</strong> recognises<br />
that the star section needs to be kept<br />
full to prevent unwanted material being<br />
extracted into the bed. As a result, 7<br />
rows of stars and a web combine to<br />
prevent this and to enable the machine<br />
to work more efficiently where some<br />
stone is present.<br />
2: Star - Web - Web<br />
This layout consists of share, intake<br />
roller, 3 rows of stars and then two<br />
webs. Both the star spacing and the<br />
web spacing must be configured to suit<br />
the individual grower’s requirement.<br />
Fitted with or without spacers the star<br />
pitch matches the web pitches. In<br />
principle, the rear 2 webs operate in<br />
the same way as the rear webs of the<br />
All Web machine.<br />
This system has a stronger share<br />
assembly, well suited to stony<br />
conditions and with the intake roller<br />
improves the feed into the machine,<br />
especially on downhill work.<br />
Note Web – Star – Web: The<br />
positioning of stars behind a web within<br />
the machine was found to slow soilflow<br />
through the machine and created<br />
the further problem of marrying the<br />
web/star/web combination to prevent<br />
material loss – Note: <strong>Grimme</strong> rejected<br />
this system at the development<br />
stage.<br />
This layout consists of a share followed<br />
by 3 webs. The web pitches (sizes)<br />
remain the same or reduce in pitch<br />
through the machine. The progression<br />
of the sieving requires smaller pitches<br />
that keep in unwanted material, which<br />
is then buried in the trench.<br />
The All Web system suits land with<br />
abrasive stone content, or where star<br />
type systems are not accepted or<br />
required. In the early days of de-stoning<br />
all machines were produced in this<br />
format.<br />
The need for clod removal rather than<br />
stone removal was responsible for the<br />
introduction the newer concept of star<br />
systems, all based on <strong>Grimme</strong>’s original<br />
harvester star separation systems.<br />
The Future – What<br />
does it hold?<br />
Multi-bed de-stoning systems do not<br />
provide the advantages seen with<br />
bed openers and multi row<br />
planters.<br />
The three bed system has been tried<br />
but it is now accepted that using a<br />
machine in varying soil types and<br />
trying to dispose of varying amounts<br />
of stone/clod is impracticable as a<br />
reduced cost system.<br />
The one man - one machine scenario<br />
glosses-over the practicalities. Similar<br />
difficulties exist with a two-bed<br />
system as does the fitment of a<br />
power unit to match the wheelings.<br />
Given these constraints we must<br />
continue to develop the existing<br />
single bed system.<br />
With technological advances in<br />
design, construction and material<br />
development we look forward to a<br />
future of stars, webs and<br />
combinations of the two.<br />
Still confused? – watch this space!<br />
DE-STONER APPRAISALS DE-STONER COMPARISONS 1: STAR & WEB 2: STAR - WEB - WEB 3: ALL WEB