LKB Bromma 2178 Knifemaker II 90 01 9233 Made in Sweden
Part Number: 90 01 9233
Serial Number: 394
Made in Sweden
Using the LKB KnifeMaker II, strips of 25mm wide, high quality glass of up to 10mm in thickness are scored transversely then broken into squares or rhombus-shapes. Each square or rhombus is returned to the KnifeMaker II and scored diagonally, then fractured into two knives each with a straight, sharp edge for use in ultramicrotomy or histology.
The LKB KnifeMaker II utilises the well-proven design principles of the original LKB KnifeMaker. This popular instrument, which made manual knife-making techniques obsolete, standardised the production of glass knives by defining the position of the score on the glass and by applying the optimal pressure at the correct locations to ensure a slow controlled break. These principles have been further refined to produce the balanced break method of breaking the strips, to incorporate new developments in scoring and to simplify the entire operation of routine knife-making.
With the balanced break method, KnifeMaker II routinely produces straight-sided squares of unprecedented reproducibility. It also allows greater flexibility in the choice of score before the final fracture into two knives. A choice of three preset score lengths are provided on KnifeMaker II; a short symmetrical score producing a long free break, the traditional asymmetrical medium-length of score, and a long score giving a short, but well-controlled free break. When gentle pressure is applied directly under the score, the square fractures to form two usable knives.
Although the position of each of these three scores is fixed, the position of the glass square can be adjusted to allow for the specific requirements of the user. By controlling the position of the glass square relative to the score, knifemaking can be optimised for ultrathin, semithin or frozen sectioning. For security in a multi-user environment, these adjustments can be locked to ensure the reproducible production of high quality knives.
The traditional knife angle for ultramicrotomy is 45°, however it is often recommended that a larger angle should be used for specimens which prove difficult to section. KnifeMaker II retains the versatility of the original LKB KnifeMaker in producing a range of knife angles. By setting the click-position glass holder, a rhombus can be made from the strip to provide knife angles larger than 45°.
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