A method for rapidly measuring the roller pass major semi-axis of a three-roller reducing mill to improve the outer-diameter precision and surface quality of a steel pipe includes selecting a corresponding value of the average diameter of an elliptical pass, a value of a first major semi-axis, and a value of a minor semi-axis according to a rack station number of a special numerical control lathe; calculating a value of a first line segment according to an elliptic equation, the obtained value of the first major semi-axis, and the obtained value of the minor semi-axis; calculating a value of a second major semi-axis according to the right-angle triangle theorem and the value of the first line segment; and measuring a value of the first dimension by attaching three claws of a three-claw internal micrometer to three roller gaps.

An angle ruler includes a ruler, a ruler holder and a digital display module, the digital display module is fixed on the ruler holder and the ruler holder has an inclined edge. The angle ruler can not only retain the using habit of the user, but also can make the reading more convenient, accurate and time-saving.

An angle ruler includes a ruler, a ruler holder and a digital display module, the digital display module is fixed on the ruler holder and the ruler holder has an inclined edge. The angle ruler can not only retain the using habit of the user, but also can make the reading more convenient, accurate and time-saving.

The present invention is a new multipurpose speed square that is easily utilized by any workman who typically requires a means for measuring, aligning, leveling, etc. The speed square is multi-functional, of simple construction, lightweight and portable. The speed square can be easily carried as an all-in-one tool and thus eliminates the need for additional tools, or the like. The speed square that can be manufactured from substantially any suitable material of engineering choice, is cost effective to produce, manufacture, easily marketed and easily sold.

The present invention is a new multipurpose speed square that is easily utilized by any workman who typically requires a means for measuring, aligning, leveling, etc. The speed square is multi-functional, of simple construction, lightweight and portable. The speed square can be easily carried as an all-in-one tool and thus eliminates the need for additional tools, or the like. The speed square that can be manufactured from substantially any suitable material of engineering choice, is cost effective to produce, manufacture, easily marketed and easily sold.

An adjustable T-square device and method of use is shown and described herein. The adjustable T-square has a plurality of apertures with at least one locking detent to set precise angles. The adjustable T-square has a locking pin to further engage a ruler portion to a head portion to minimize error when using the device.

An adjustable T-square device and method of use is shown and described herein. The adjustable T-square has a plurality of apertures with at least one locking detent to set precise angles. The adjustable T-square has a locking pin to further engage a ruler portion to a head portion to minimize error when using the device.

A device for measuring, marking and cutting material, the device formed of a clear, transparent, translucent or tinted substrate that is either rigid, semi-rigid, flexible or bendable and having in one implementation, a plurality of first and second lines are formed on the substrate to define an unbroken, continuous channel in which a plurality of windows are formed to include a grid line segment to aid in aligning the device with the underlying material. Alternatively or in addition, the device includes one or more visually perceptible invisible lines bounded by opposing line segment pairs and terminal ends to aid in viewing and aligning with underlying material.

A device for measuring, marking and cutting material, the device formed of a clear, transparent, translucent or tinted substrate that is either rigid, semi-rigid, flexible or bendable and having in one implementation, a plurality of first and second lines are formed on the substrate to define an unbroken, continuous channel in which a plurality of windows are formed to include a grid line segment to aid in aligning the device with the underlying material. Alternatively or in addition, the device includes one or more visually perceptible invisible lines bounded by opposing line segment pairs and terminal ends to aid in viewing and aligning with underlying material.

A system for cutting narrow workpieces having a track that extends a width between a cutting edge and a non-cutting edge. One or more measuring bodies are connected to a slot adjacent the non-cutting edge that include a measuring bar that extends forward from the front side of the measuring body and under the track as well as extends rearward from the rear side of the measuring body. The measuring bar slides within the measuring body to accommodate the desired workpiece thickness. The measuring bar includes measuring indicia and a measuring member that facilitates measurement of workpiece thickness. Measuring body includes a locking member that locks the measuring bar at a desired thickness. Measuring member may be adjusted to calibrate the measuring member to the track and saw using a locking member. Measuring body also includes a support leg and associated locking mechanism that levels the measuring body.