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Sorvall Glass Knife Maker

Sorvall Glass Knife Maker
Product Code: GKM-1
Availability: Call For Availability
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• Precise enough for electron microscopy • Wide enough for clinical pathology

• More knife sizes - 6mm, 9mm, and 12mm

Wider Knives for Wider Sections

Wider and thinner microscopy sectioning with glass knives is now possible thanks to the development of the Sorval1 Glass Knife Maker (GKM). The GKM makes glass knives up to 12mm (½ in) wide with exceptional straight edges. With a longer cutting surface and straighter cutting edge, GKM made knives sections wider plastic blocks to achieve greater clarity, contrast, and resolution than paraffin permits. When used on the Sorvall JB-4 Microtome, the extra-wide knives from the GKM produce sections as fine as 0.25 μm and they will cut plastic block faces as large as 12mm x 16mm. Even kidney and undecalcified bone biopsies can be consistently thin sectioned with little or no fragmentation using GKM-made knives. Designed to make excellent knives for the MT-I, MT-2 and MT-2B Ultra Microtomes; knives can also be made for other ultramicrotomes.

New levels of glass knife size and accuracy are achieved by the GKMs unique glass breaking system. Now, 9 mm knives may be used for ultramicrotomy, and 12mm knives for light microtomy. Unlike other instruments which produce knives by breaking glass against pressure points, the GKM uses stress from a single pressure bar which breaks glass downward into a groove. This singular, uniform pressure application produces smoother and wider cutting edges. Even 6 mm thick glass used on the GKM will result in knives that cut wide sections.

Built-In Precision

The GKM is designed to consistently make high quality glass knives because glass-breaking variables are controlled by the instrument. Glass is held securely throughout all phases of scoring and breaking to reduce glass slippage and rejects. A long-life carbide scoring wheel, with preset spring-controlled pressure maintains a non-varying score line of uniform depth. Precision vernier-controlled placement of glass assures constant, reproducible knife angles. Steadily increasing pressure, slowly applied, reduces internal shock wave reflections and assures long-length usable knife edges.

No Skill Needed

No glass-breaking experience is needed to operate the Sorvall Glass Knife Maker. In fact, with the GKM, the most inexperienced person will be capable of producing high quality knives with little effort.

Scoring, breaking and clamping tensions are preset at the factory. The instrument stays properly adjusted. If different settings are desired, they are easily achieved. The controls are readily accessible, yet out of the way, so accidental misadjustment is virtually impossible. Both scoring and breaking are quickly and easily accomplished in the GKM. Strips of glass 25mm x 100 mm (1 in x 4 in) or 50mm x 100mm (2 in x 4 in) are first broken into 25 mm (1 in) squares. These squares are then accurately broken into knives.


Low Maintenance

The rugged, reliable GKM requires little maintenance. Brushing glass chips off the top plate and daily cleaning of the scoring assembly are all it takes to maintain trouble-free operation. The entire scoring assembly slides out for easy cleaning and the tungsten carbide cutter wheel provides months of service in normal use. When it comes time for replacement, the cutter wheel is easily lifted out and a new one is quickly installed.


• Breaks thicker glass: up to 12mm thick for sectioning wider blocks

• 45° and 90° Breaks: Universally desired 45° triangles are made against built-in stops and without adjustments

• Pressure-groove breakage: for smoother, straighter, longer cutting edges

• Vernier-controlled placement: for constant, reproducible knife angles

• Dampening: for shock wave absorption to produce smooth cutting edges

• Simple operation: for good knives without the need for tedious care in developing technique

• Easy maintenance: for time-saving, economical operation

• Small, compact: requires little bench space

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