BOT/MBIO/ZOOL 5364

The LKB KNIFEMAKER 7800B

The illustrated parts and operation of the LKB Knifemaker. This is the second part of “Making Knives with the LKB Knifemaker” at URL: http://bomi.ou.edu/bmz5364/making-knives.html

Figure 1. Legend to the parts of the knifemaker.

1. Fork used to remove the glass knives from the apparatus 2. Locking lever 3. Shaft 4. Adjusting sleeve for (8) 5. Bracket 6. Set screw for (4) 7. Cover screw for (6) 8. Clamping head 9. Locking screw for (28) 10. Support studs 11. Locking screw for (12) 12. Rear dial 13. Score selector

14. Cover plate 14a. Dot (marking 200 mm 15. S= shaft with cutter wheel 16. Support plate for glass strip 17. Locking knob for (21) 18. Breaking knob 19. Operation Instructions 20. Angle setting plate 21. Guide plate 22. Front glass holder 22a. Guiding rings 23. Locking screw for (22)

23a. DPA-lever (lever for Damping Pressure Adjustment) 23b. Damping pad 24. Locking screw for (25) 25. Front dial 26. Breaking pins 27. Centre line 28. Rear glass holder 29. Arresting stud for 25 mm glass strips width 29a. Arresting stud for 38 mm glass strips width 30. Foundation block (silumingamma)

31. Disengage knob 32. Cutter wheel holder (see fig. 8). 33. Screw for adjusting scoring pressure 34. Cutter wheel (sintered tungsten carbide 35. Shaft for cutter 36. Locking pin 8. Clamping head strip length) 37. Bracket for (32) 38. Guide for (15) 39. Allen wrench for adjusting scoring pressure 40. Screws for (20)

Figure 2. This shows the action of the locking arm holding the glass in place. This should be supported evenly as the head rests on the glass. Then the head should be tighted at the pivot arm (3). When the arm is raised, it should be supported as it is raised, so that it does not fall onto the glass.

Figure 3. The breaking of the glass square into two knives. Alignment of the positioning of the glass square is critical to forming a good knife. Positioning of the square is critical to making useful knives. If the knifemaker repeatedly makes inadequate knives, contact NML personnel. (OnlyNML personnel will make these adjustments as these settings are critical to everyone.)

Figure 4. The glass strip abuts the first pedestal (29). Glass should be squarely placed into the holder to make an exactly 90˚ break, thus forming a perfect square. The square is then placed between the front (22) and rear (28) glass holders and tightened into position using knob 31.

Figure 5. These are the resulting two knives—one of which should be an inverted mirror image of the first. At one end of the triangle, there is a 90˚ glass step, whereas on the other side, there is a sharp edge created by two free breaks that occur at approximately at 52˚ angle (α). Placement of the stress lines and occurrence of defects should influence your knife selection.