I recommend placing them on a rug, carpet or yoga matt for improved stability and to eliminate any shake.Ĭonstruction is solid and you can do additional exercises such as push up etc. They do have leg adjustment for uneven floor. Also you can change how far apart you want your bars which is great and was on my requirements list. Some other models may not be high enough which means that your knees will hit the floor when doing deep dips. They allow for the best height adjustment I came across which is very important if you are over 6'. Even when assembled they don't take a lot of space since you can place them next to each other by the wall. Sturdy for dips but I wouldn't buy them for calisthenics. They are also available in either plastic or aluminum finishes.Good bars with great height adjustment, decent sturdiness and it's a space saver!Įasy to assemble and can be taken apart just as easily to be stored under the bed or elsewhere.

Scales are available in several lengths, in either architectural or metric measurements. Frequently used angles such as 30, 45, and 60 degrees have positive set points. The scales on drafting machines can be set at angles by releasing a lock, pressing a release button and turning the head. Left-handed people hold the head in their right hand with the scales facing the opposite direction. Right-handed people hold the head in place with the left hand. The head with the scales on it is fastened to the vertical track and slides up and down.ĭrafting machines are available for right- or left-handed people. The track type has a horizontal track mounted to the top edge of the drafting table with a vertical track attached to it that slides left and right. The head and the scales on it remain parallel to their original setting. The drafter moves the head up and down and right and left. The arm type has two arms that pivot in the center with a head at the end of the lower arm - which is clamped to the top edge of the drafting table. There are two basic types of drafting machines - the arm type and the track type. There is also a scale in angular degrees on the head that replaces the protractor. It is fixed to the drawing board and consists of vertical and horizontal blades that serve as scales for linear measurement, eliminating the need for a triangle and T-square for drawing vertical and horizontal lines. Drafting MachinesĪ drafting machine is a combination of several conventional drafting tools. It permits the drafter to draw long horizontal lines and serves as a base for the placement of triangles and other instruments for precision drawing. Parallel bars are available in a variety of lengths to fit different drawing board sizes. When properly installed, the bar can be moved up and down the drawing board and always be parallel with the top of it. The bar moves up and down on thin wire that moves runs over pulleys inside the bar.

Parallel BarĪ parallel bar is attached by cleats and pulleys to a particular drawing surface. However, in modern practice the T-square has been replaced by the parallel bar and the drafting machine, as they do not require a constant hand to steady the head. The T-square is inexpensive and portable, which makes it convenient for students. To use a T-square, one holds it with one hand (usually the left) at the head so it can be moved into position and held in place while a line is drawn along the straightedge with the other hand. They are available with opaque or transparent edges, the latter making it easier to see through to existing lines when spacing by eye. The most common lengths are 36 and 42 inches (.91 and 1.06 m). T-squares come in different lengths to coordinate with various drawing board sizes. The battery power eliminates the need for floor outlets or placement near a. The large range of adjustability makes the bars useful for. the bars to assist a patient standing from a wheelchair. The state of the art design articulates while lowering. The head is generally very sturdy and immovable. Patent pending Electric Parallel Bars offer the best in innovation. T-SquareĪ T-square consists of a straightedge with a head set at right angles that can be set flush against the edge of a drawing board or table. A device called a drafting machine (Figure 2-5) is also sometimes used. The most common of these instruments are the T-square and parallel bar (Figure 2-4). To make sure lines are straight in a horizontal, vertical, and angular direction, there are several tools available.

It is extremely important to make sure lines on design drawings and construction drawings are exactly straight and, when required, parallel.