Base Grade Granite
The gx granite base super precision the gx is available as a standard three axis machine with optional 4th axis rotary stage or 5 axis trunnion table.
Base grade granite. The granite properties determine the stiffness of the granite therefore accuracies can be guaranteed with less thickness than other types of granite. Level 1 granite has a very simple design and the colors are standard. Eley metrology s granite surface plates and tables are in accordance with bs 817 2008 and are graded at three levels. Granite is a hard material but its hardness varies for several reasons.
The surface plate is often used as the baseline for all measurements to a workpiece therefore one primary surface is finished extremely flat with tolerances below 11 5 μm or 0 0115 mm per 2960 mm for a grade 0 plate. This low grade granite is usually imported from china and sold through granite liquidators big box stores or cut into tile. 6 x 6 x 2 grade aa 00005 these 6 x 6 x 2 granite bases are supplied with a 1 25 diameter 8 tall column and an indicator arm rigid or with a fine adjustment knob. Grade 0 granite surface plates tables.
A surface plate is a solid flat plate used as the main horizontal reference plane for precision inspection marking out layout and tooling setup. The granite base indicator stands that we offer are made of black granite which is stronger and denser than light colored granite is more stable and wears longer. Granite hardness is a property defined in part by the amount of quartz content and lack of mica. The minitech cnc mini mill gx is the most affordable precision ground granite frame micro machining system on the market.
An experienced granite plate technician can estimate the hardness by its color which is an indication of its quartz content. Grade 0 plates and tables are typically used for laboratory environments where master artefacts are required.