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This page contains data for the Marldon Traverse range. If you wish to know more
about Marldon and its Manufacturing Program, click Marldon.
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Marldon Rolling Ring Traverse Units
Catalogue |
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What you should know to select and
order the right traverse for your application. |
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Determine the side thrust required for your application and select the
appropriate traverse unit from Table 1 below. The maximum side thrust in
Newtons is given for each size of traverse unit under the column headed
"Maximum Side Thrust N".
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Table 1 |
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| MODEL
| Shaft
Diameter
(mm)
| Maximum
Pitch
mm/rev
| Maximum Side
Thrust 'N' at
(notes)
| Weight
Kg
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| 100rpm
| 1000rpm
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| RT15
| 15
| 11
| 123
| 110
| 1.0
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| RT20
| 20
| 16
| 170
| 160
| 1.8
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| RT30
| 30
| 24
| 280
| 260
| 3.3
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| RT40
| 40
| 32
| 450
| 420
| 8
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Your side thrust (F2) requirement, if used in a typical winding application,
can be determined by using the following formula:
F2 = (C x F1) / (1.6 x B)
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F1(N) = Tension in the material to be wound, expressed in Newtons
F2(N) = Side thrust requirement
The side thrust requirement is directly related to the
tension (F1) in the material to be wound.
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Important notes on side thrust |
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a) It is important to estimate the side thrust required to ensure
that the critical factors in your application are recognised. Often
more side thrust is assumed to be necessary than is actually needed.
b) The stated side thrust in Table 1 is the value set in our factory
for standard units. If a higher value is required it is possible in
most circumstances to increase the power by a simple adjustment.
c) All Marldon units have 3 rings inside. Competitor companies often
promote 4 ring units on the basis that 4 ring units offer significantly
increased power. This is a fact. However it should be recognised
that often this level of thrust is redundant and the true reason for the
proposal is the greater stability on the shaft afforded by 4 ring units.
Marldon 3 ring units are already stable, making a fourth ring unecessary.
d) You will note that side thrust is slightly increased at a lower rpm.
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The maximum width to be traversed should be established.
This is normally the inside distance between the reel flanges (dimension "C"
above). This distance will be limited for any particular size of traverse unit
to the extent that the shaft must not be so long that it would bend under the
combined weight of the traverse unit and any other load (such as a pulley or
guide roller assembly, or simply the weight of the material being wound) mounted
upon it.
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The chart below shows the acceptable combinations of shaft length and
imposed load. If your application exceeds the unit's capability a secondary
support should be used where the weight is supported on another mechanism
and the traverse unit provides the reciprocating motion.
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We offer complete assemblies to the standard dimensions shown below
(Table 2) in section 6.
However, the frame length (A) and shaft extension for the drive
(C) (both length of, and whether left-hand or right-hand) may be varied
to your requirements on request at no additional charge.
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In most winding applications, for one revolution of the reel, the traverse
needs to move a distance equal to the width of the material being wound. As
the rate of traverse can be varied by moving the pitch lever, the decision
needs to be made as to which pitch will be appropriate for the application, given
that the speed of traverse is the result of the combination of the shaft speed
and traverse pitch setting.
The maximum rate of traverse (pitch), expressed as the distance
travelled in millimeters per revolution of the traverse shaft, is given in
Table 1
The traverse shaft is normally driven by the reel shaft via a belt, and for best
results the traverse shaft speed should be kept as low as possible and
the traverse pitch set near maximum. In fact the optimum ratio of drive shaft
speed to traverse shaft speed is calculated as:
( maximum pitch per revolution (per table 1) )
maximum product diameter x 1.1
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Rolling ring traverse units consist of moving components which, although
manufactured to fine tolerances, still need fine tuning to make them reciprocate
equally in both directions. This is done in our factory prior to despatch by
means of an adjusting ring in the wall of the unit. In use, the traverse shaft
will normally only rotate in one direction, pushing all slack in tolerances in
one direction. The adjustment ring will remove this slack. However, if the
traverse shaft is reversed the effectiveness of the fine tuning is diminished.
Consequently, it is necessary that the intended shaft rotation is notified to us
at the time of order so that the correct setting can be made before despatch.
We describe the shaft rotation, when viewed looking at the pitch control scale,
and with the tripping mechanism underneath, as:
"Top Toward" (TT) or "Top Away" (TA)
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a) Traverse Unit Only ("RT")
| MODEL
| Dimensions (mm)
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| A
| B
| C
| D
| E
| F
| G
| H
| J
| K
| L
| M
| N
| O
| P
| R
| S
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| RT15
| 96
| 53
| 36
| 32
| 16
| 22
25
| 5
| 32
| 16
| 20
| 39
| 47
| 33
| 30
| 5
| M5
| 8
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| RT20
| 126
| 70
| 70
| 40
| 19
| 33
37
| 6
| 40
| 19
| 32
| 54
| 62
| 44
| 41
| 6
| M6
| 10
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| RT30
| 144
| 86
| 80
| 50
| 26
| 45
52
| 7
| 47
| 22
| 40
| 67
| 76
| 55
| 51
| 8
| M6
| 10
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| RT40
| 204
| 112
| 160
| 68
| 32
| 63
70
| 8
| 59
| 26
| 50
| 76
| 91
| 67
| 66
| 9
| M10
| 12
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b) Complete Traverse Assembly ("RTA")
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| MODEL
| Shaft
Dia
(mm)
| Frame
Length
A
| Effective
Traverse
B
| Shaft
Extension
C
| Standard Dimensions
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| D
| E
| F
| G
| H
| J
| K
| L
| M
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| RTA15
| 15
| 480
| 326
| 30
| 10
| 470
| 33
| 75
| 60
| 40
| 37
| M6
| 15
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| RTA20
| 20
| 673
| 476
| 40
| 13
| 660
| 44
| 104
| 70
| 47
| 52
| M10
| 15
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| RTA30
| 30
| 726
| 490
| 60
| 16
| 710
| 55
| 120
| 90
| 60
| 66
| M12
| 15
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| RTA40
| 40
| 1160
| 820
| 80
| 20
| 1140
| 67
| 150
| 120
| 80
| 85
| M16
| 25
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