SKX1680 bare machine is integrally formed cast irons, with high bearing capacity and high-density ribbon structure. SKX1680 takes stress reduction as the design concept, and is processed by secondary tempering after being naturally aged for 3 months, so as to ensure whole quality stability of machine tool. The Y-axis motor is postposed and can be maintained conveniently, so as to reduce the operation distance at the front part. The stanchions adopt large-span herringbone structure so that the excellent stability of mainshaft head can be improved when moving. The counterweight hammer for mainshaft head is a hidden counterweight hammer and is fixed by a guide rod so that the machining precision is not influenced owning to the shaking of counterweight hammer. The machine tool body adopts a widened base so as to ensure the worktable moves in a fully supported way. The three-axis guideway adopts imported overloaded precision-level linear guideway. Y axis is supported by four guideways, while X axis is supported by six sliding blocks. The screw rod adopts imported R50-010 C3-grade grinding screw rod, with two ends being fixed and pre-stretched. All bearings are imported P5-grade bearings in pair. The mainshaft is BT50 precision mainshaft produced in Taiwan, with the maximum rotating speed of 6000r/min. Stainless steel protective shields are provided before and after Y axis, on the left side and right side of X axis and below Z axis. Furthermore, automatic lubricating systems are provided, and tool storage mounting surfaces are reserved. The appearance of bare machine shall be painted with required colors. The bare machine does not contain any electrical apparatuses.

Item	Requirement (unit) or specification	Remarks
Dimensions of worktop	800X1700
Distance from end surface of mainshaft to worktop	120-820
Vertical stroke (Z) of mainshaft	700
Lateral stroke (X) of worktable	1600
Longitudinal stroke (Y) of worktable	800
X-axis linear guideway	HGW55CA3RP	Hiwin
Y-axis linear guideway	HGW45CAP(4)	Hiwin
Z-axis linear guideway	HGW65HAP	Hiwin
Three-axis ball screw rod	R50-010-0.008 C3-grade	Hiwin
Type and rotating speed of mainshaft	BT50、6000r/min	Volis
Three-axis bearing	Angle-contacted P5-level bearings in pair	Germany
Connecting forms of three-axis and mainshaft	directly-connected three-axis and mainshaft connected by synchronous belt
Torque of Recommended three-axis motor X/Y/Z	27Nm 30Nm 27Nm
Recommended power of mainshaft	11-15KW
Quantity-dimension*spacing of T-shaped trough of worktable	5-22X150
Planeness of worktable	0.02
Maximum loading capacity of worktable	1500(kg)
Verticality of Z axis on XY axis	0.02
Planeness of Z axis when moving	0.02
Positioning precision	0.01
Net weight of bare machine	10500Kg
Outline dimension	2750X3950X3100