A bar length detection tool and a method for detecting a length of a bar are provided, the bar length detection tool comprises: a substrate, a first bearing seat and a second bearing seat oppositely disposed on the substrate, and a micrometer; wherein a positioning device is rotatably connected to the first bearing seat, a mounting plate is rotatably connected to the second bearing seat, and the first bearing seat and the second bearing seat are each provided with at least two needle bearings.

A bar length detection tool and a method for detecting a length of a bar are provided, the bar length detection tool comprises: a substrate, a first bearing seat and a second bearing seat oppositely disposed on the substrate, and a micrometer; wherein a positioning device is rotatably connected to the first bearing seat, a mounting plate is rotatably connected to the second bearing seat, and the first bearing seat and the second bearing seat are each provided with at least two needle bearings.

A measuring instrument and a method of remote quantity value transfer/traceability are provided. The measuring instrument includes a central processing component, a local quantity value transfer/traceability component connected to the central processing component, a remote quantity value transfer/traceability component connected to the central processing component and a remote communication component connected to the central processing component; a metrological grade of the remote quantity value transfer/traceability component is greater than or equal to that of the local quantity value transfer/traceability component; the remote quantity value transfer/traceability component is configured to perform quantity value transfer/traceability to the local quantity value transfer/traceability component by using one of the in-machine metrological standard and the remote high-grade metrological standard provided from the remote quantity value transfer/traceability component. The method of remote quantity value transfer/traceability can be achieved to make the quantity value transfer/traceability of the measuring instrument very convenient, simple and less costly.

A measuring instrument and a method of remote quantity value transfer/traceability are provided. The measuring instrument includes a central processing component, a local quantity value transfer/traceability component connected to the central processing component, a remote quantity value transfer/traceability component connected to the central processing component and a remote communication component connected to the central processing component; a metrological grade of the remote quantity value transfer/traceability component is greater than or equal to that of the local quantity value transfer/traceability component; the remote quantity value transfer/traceability component is configured to perform quantity value transfer/traceability to the local quantity value transfer/traceability component by using one of the in-machine metrological standard and the remote high-grade metrological standard provided from the remote quantity value transfer/traceability component. The method of remote quantity value transfer/traceability can be achieved to make the quantity value transfer/traceability of the measuring instrument very convenient, simple and less costly.

A digital measurement instrument with excellent environmental durability and at least a conventional level of usability including a main scale, a slider movable relative to the main scale, a displacement sensor configured to detect displacement or position of the slider in relation to the main scale, and a control circuit. The control circuit controls change between a normal measuring mode and an origin setting mode. The control circuit also sets and stores a first area, the first area being a preset predetermined range outside of a measurement range. The control circuit also changes operation mode from the normal measuring mode to the origin setting mode when the slider is detected to have stopped within the first area for a consecutive predetermined period of time. Additionally, the digital calipers are provided with no mechanical push button switches.

A digital measurement instrument with excellent environmental durability and at least a conventional level of usability including a main scale, a slider movable relative to the main scale, a displacement sensor configured to detect displacement or position of the slider in relation to the main scale, and a control circuit. The control circuit controls change between a normal measuring mode and an origin setting mode. The control circuit also sets and stores a first area, the first area being a preset predetermined range outside of a measurement range. The control circuit also changes operation mode from the normal measuring mode to the origin setting mode when the slider is detected to have stopped within the first area for a consecutive predetermined period of time. Additionally, the digital calipers are provided with no mechanical push button switches.

Methods and equipment suitable for measuring dimensions of a cylindrical body including systems having a housing and means for supporting the housing relative to an arcuate surface of the body. The supporting means comprises at least two wheels having axes of rotation oriented so that engaging the arcuate surface of the body with the two wheels causes edges of the two wheels to contact the arcuate surface at two terminals spaced apart by a length of a chord lying in a cross-section plane of the body. Measurement means is mounted to the housing for contacting a surface point of the body located within the length of the chord of the body, and means is provided for determining the diameter of the body based on the length of the chord determined by the two wheels and a height of the chord ascertained with an output of the measurement means.

Methods and equipment suitable for measuring dimensions of a cylindrical body including systems having a housing and means for supporting the housing relative to an arcuate surface of the body. The supporting means comprises at least two wheels having axes of rotation oriented so that engaging the arcuate surface of the body with the two wheels causes edges of the two wheels to contact the arcuate surface at two terminals spaced apart by a length of a chord lying in a cross-section plane of the body. Measurement means is mounted to the housing for contacting a surface point of the body located within the length of the chord of the body, and means is provided for determining the diameter of the body based on the length of the chord determined by the two wheels and a height of the chord ascertained with an output of the measurement means.

An assembly for translating extensions of a microstop's bit to other microstop bits, wherein the microstop has a shank, a first platen, and bit cutting end which is alternatively extendable from and retractable toward the first platen, the assembly incorporating a frame; a second platen having a port which is fitted for through extensions of the bit cutting end; a contact member; a spring biased slide shaft for positioning the contact member beneath the port at a first position, the slide shaft being adapted for, upon an extension of the bit cutting end from the first platen, engaging the contact member and moving the contact member to a second position; the assembly further incorporating a linear encoder mounted to the frame for measuring displacements of the contact member between the first and second positions.