Mathey Dearman Mini Jolli Chain Machine - Manual (Page 6)

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Table 1. Length of the chain require for various pipe diameters. (See machine side view on page 4)
Pipe diameter *
In/mm
2 / 51 3 / 76 4 / 102 6 / 152 8 / 203 10 / 254 12 / 305
Wheel Position A A B B B B B
Chain length
In/mm
23 / 584 26 / 660 27 / 686 34 / 865 40 / 1016 46 / 1168 52 / 1321
Pipe diameter *
In/mm
16 / 406 18 / 457 20 / 508 22 / 559 24 / 610 26 / 660 28 / 711
Wheel Position B B B B B B B
Chain length
In/mm
62 / 1575 68 / 1727 74 / 1880 80 / 2032 86 / 2184 92 / 2337 98 / 2489
Pipe diameter *
In/mm
30 / 762 32 / 813 36 / 914 40 / 1016 42 / 1067 48 / 1219 52 / 1321
Wheel Position B B B B B B B
Chain length
In/mm
104 / 2642 110 / 2794 123 /3124 135 / 3429 141 / 3581 159 / 4039 171 / 4368
*The pipe diameter listed is the nominal pipe size; for the actual pipe outside diameters see a commercial
pipe chart. A chain calculation formula for determining the length of chain required for any size pipe can be
found on the Internet at www.mathey.com under Support / Product Formulas / Mini Jolli Chain Machine.
To lengthen or shorten the Cottered Chain use the following procedure
4.2.1 Select the chain segments required to extend or shorten the chain to the length. (see Table 1)
4.2.2 Measure the length of the chain and remove the cotter pins at the next full link.
4.2.3 Place the machine on the pipe.
4.2.3.1 Place the Chain (Figure 3 Item N21) over the sprocket (Figure 3 Item N4/A). The chain can also be
joined with a chain connecting
Link (N21/B) to easily identify the chain length required for a given diameter.
4.3 – CUTTING 16” PIPE AND SMALLLER
4.3.1 Before placing the machine on the pipe, check area where the machine will be placed on the pipe for
concave or convex areas in the pipe surface. Remove as much of the deformity that is allowed by the
welding specification.
4.3.2 Set the machine on the portion of the pipe that is to remain on the pipe stand, with the wheels on the
torch arm side of the machine about 7” – 9” (179 - 229mm) away from the cut line. The distant from
cut line to the wheels is dependent on the torch bevel angle.
4.3.3 Lay the chain (Figure 3 Item N21) to rest on the sprocket (Figure 3 item N4/A).
4.3.4 Connect the chain ends.
4.3.5 Rotate the tensioning hand wheel (Figure 3 item N8/A) to apply tension to the chain.
4.3.6 For a square cut, rotate the Mini Jolli Chain Machine 1 full turn around the pipe to insure the chain is
perpendicular to the outside diameter of the pipe.
WARNING: Do not place the machine on the portion of the pipe that is being cut off.
This will result in possible injury and unrepairable damage to the Mini Jolli Chain
Machine.
WARNING: If rotating crank handle to move the chain over the sprocket, the hand
can become drawn between the sprocket (Figure 3 Item N4/A) and the clamping
plate (figure 3 Item N6).