M and MG Class Machines Setup & Operation

M and MG Class Machine – General Information

Cutter Mechanism
Upper and Lower Cutter

1) The Upper and Lower Cutter may be adjusted up and down and right to left. The standard setting would have them adjusted so that the fabric going into the stitch will be trimmed to the width of the Chaining Finger on the Needle Plate.

2) The Lower Cutter Holder slides in the L.C.H. Support Assembly allowing right to left (lateral) movement of the Lower Cutter. Some Lower Cutter Holders have an internal spring to maintain pressure between the Upper and Lower Cutter. In some cases you may wish to fix the position of the Lower Cutter; to do this, tighten the screw 85 3/16 at the desired position. Make sure you are only applying light pressure against the Upper Cutter.

3) The U.C.C. Thrust Block supports the force against the Upper Cutter Carrier by the cutters. After extended service it may be necessary to adjust this block by means of Adjusting Screw 81 3/16 and the clamp screw 55 3/16. There should be about 1 thousandth of an inch of clearance between the Thrust Block and the Upper Cutter Carrier.

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Knife Adjustment

4) Set the height of the Lower Cutter so that the cutting edge is slightly above the surface of the Needle Plate and tighten the Lower Cutter clamp nut 2 5/32. Make sure the height of the blade does not interfere with the Presser Foot.

5) Clamp the L.C. Holder to the width of trimming desired by screw 85 3/16. Turn the Hand Wheel over until the upper cutter is in its lowest position of travel. At this position, the top of the cutting edge of the Upper Cutter should be even with the top of the Lower Cutter’s cutting edge. This setting is obtained by adjusting the Upper Cutter Clamp Screw 37 or 38 5/32 and the Upper Cutter Holder Clamp Screw 8 1/8.

6) Turn the Hand Wheel over again until the Upper Cutter is in its highest position of travel. The downward projection of the Upper Cutter must never travel above the height of the Lower Cutter. If it goes above the Lower Cutter, you must readjust the settings made in step 40 above to prevent the Upper Cutter from breaking the Lower Cutter.

7) The two Cutters must remain in contact with each other in order to cut cleanly. Turn the Hand Wheel so the Upper Cutter in its highest travel position, and loosen the L.C.H. Clamp Screw 85 3/16. Press the Lower Cutter holder lightly to the right until contact is made with the Upper Cutter and tighten the L.C.H.C. Screw. Some machines have spring type supports like the one shown; on this support you only have to loosen the L.C.H.C. Screw, and the spring applies the pressure needed to cut. Do not allow the Lower Cutter to push too tightly against the Upper Cutter. If more than light pressure is required to make a clean cut, the blades are probably dull and should be sharpened on a Merrow Cutter Grinder.

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