Method of classifying three-dimensional coordinate measuring instruments according to their structure

1. Moving bridge type

The mobile bridge type is the most commonly used structure of the three-dimensional coordinate measuring instrument. The axis is the main axis moving in the vertical direction. The box-shaped frame guides the main axis to move in the direction along the horizontal beam. This horizontal beam is perpendicular to the axis and is supported at both ends by two pillars. The beam and the pillars form a "bridge", and the bridge moves in the axial direction along two guide grooves perpendicular to the axis on the horizontal plane. Because both ends of the beam are supported by pillars, the minimum deflection can be obtained, and it has higher accuracy than the cantilever type.

2. Bridgebed type

Bed-type bridge type, the axis is the main axis moving in the vertical direction, the box-shaped frame guides the main axis to move along the beam of the vertical axis, and the beam moves in the axial direction along two horizontal guide rails. The guide rails are located on the upper surface of the pillars, and the pillars are fixed on the machine body. This type is the same as the mobile bridge type, and the two ends of the beam are supported, so the deflection of the beam is minimal. This type has better accuracy than the cantilever type, because only the beam moves in the axial direction, so the inertia is smaller than when the entire bridge moves, and it is easier to operate manually than the mobile bridge type.

3. Gantry type

Compared with the bed type bridge, the column bridge is directly fixed on the floor and is also called the door type. It has greater and better rigidity than the bed type bridge and is mostly used in larger coordinate measuring machines. Each axis is driven by a motor, and the measuring range is large, and the operator can work inside the bridge.

4. Fixed bridge type

Fixed bridge type, the axis is the main axis moving in the vertical direction, and the box frame guides the main axis to move along the horizontal beam of the vertical axis. The bridge (pillar) is fixed to the machine body, and the measuring table moves along the guide rail of the horizontal plane in the axial direction, and is perpendicular to the axis. Each axis is driven by a motor to ensure position accuracy. This model is not suitable for manual operation.

5. L-Shaped bridge type

L-shaped bridge type, this design is to make the bridge have the smallest inertia when the axis moves. Compared with the moving bridge type, the inertia of the moving components is less, so it is easier to operate, but the rigidity is poorer.

6. Fixed table cantilever arm type

Axis moving cantilever type, the axis is the main axis moving in the vertical direction, the box frame guides the main axis to move in the axial direction along the horizontal cantilever beam of the vertical axis, and the cantilever beam moves in the axial direction along the guide groove on the horizontal plane and is perpendicular to the axis and the axis. This type is open on three sides, easy to install and remove workpieces, and the workpiece can be extended out of the table to accommodate larger workpieces, but the cantilever will cause low precision.

7. Single pillar mobile type (Moving table cantilever arm type)

Single-pillar mobile type, the axis is the main axis and moves in the vertical direction, the pillar as a whole moves on the axis along the horizontal guide groove, and is perpendicular to the axis, and the axis is connected to the pillar. The measuring table moves on the axis along the horizontal guide groove, and is perpendicular to the axis and the axis. This type of measuring table, pillars, etc. have good rigidity, so there is little deformation, and the linear scale of each axis is closer to the measuring axis to meet the Abbe theorem.

8. Single column xy table type

Single-pillar measuring table mobile type, the axis is the main axis moving in the vertical direction, the pillar is attached with an axis guide groove, and the pillar is fixed to the measuring instrument body. When measuring, the measuring table moves along the axis and axis direction on the horizontal plane.

9. Moving table horizontal arm type

The horizontal arm measuring table is mobile type. The box-shaped frame supports the horizontal arm to move in the vertical (axis) direction along the vertical pillar. The probe is installed on the horizontal cantilever. The pillar moves in the axial direction along the horizontal guide groove and is perpendicular to the axis. The measuring table moves in the axial direction along the horizontal guide groove and is perpendicular to the axis and the axis. This is an improved design of the horizontal cantilever type to eliminate the deflection of the horizontal arm in the axial direction caused by extension or retraction.

10. Fixed table horizontal arm measurement table type

The structure of the fixed type horizontal arm measuring table is similar to that of the movable type measuring table. This type of measuring table is fixed, and the shaft moves in the guide groove. During measurement, the support moves in the guide groove of the shaft, and the shaft sliding table moves in the vertical axis direction.

11.Moving horizontal arm alarm type

Horizontal arm mobile type, the axis cantilever moves in the horizontal direction, the box frame supporting the horizontal arm moves in the axis direction along the support, and the support is perpendicular to the axis. The support moves in the axis direction along the horizontal guide groove and is perpendicular to the axis, so it is not suitable for high-precision measurement. Unless the horizontal arm is extended or retracted, the error caused by weight is compensated. Most of the applications are vehicle inspection work.

12. Ringbridge type

The closed-loop bridge type, because its driving method is in the center of the worktable, can reduce the impact caused by the movement of the bridge, and is the most stable of all three-dimensional coordinate measuring machines.