The Mayline parallel bar is a drafting tool designed for precision and stability in technical drawing applications. These bars feature a durable construction utilizing phenolic laminate plastic and incorporate either metal or Delrin ball-bearing rollers for smooth operation across various drawing surfaces. The documentation details the components, specifications, and procedures for restringing the above-board mechanism. Mayline offers various models, including standard, EZ Grip, and Armoredge, catering to different user needs and applications. Customer support is available via telephone at 1-800-822-8037.
Parallel Bar Construction and Components
Mayline parallel bars are constructed with a black phenolic laminate plastic base, providing a durable and stable platform. An inset transparent blade allows for clear visibility of the drawing surface beneath. The bars utilize retractable metal or Delrin ball-bearing rollers integrated into the base. The choice of roller material is application-specific; steel rollers are recommended for use with vellum, while Delrin rollers are better suited for film.
The available models include:
- Standard: A basic configuration with the phenolic laminate base and transparent blade.
- EZ Grip: Features an EZ grip attachment added to the standard base, potentially enhancing user comfort and control.
- Armoredge: Designed for drawing and cutting applications, suggesting a reinforced edge for increased durability during cutting operations.
All Mayline bars are supplied with the necessary board mounting hardware and cables for installation.
Restringing Procedure for Above-Board Mayline Straightedges
The provided documentation focuses specifically on the restringing procedure for above-board Mayline straightedges. This process involves replacing the cable that controls the movement and tension of the straightedge. The following steps outline the documented procedure:
- Removal of Components: Begin by removing the Pulley Housing, Brake Knob Washer, and Brake Knob from both ends of the straightedge. This is a repeated procedure for each end. (Figure 1 is referenced, but not provided).
- Old Cable Removal: The old cable is removed by pulling it out of the slot located in the straightedge.
- Cable Length Calculation: If using bulk cable, the total cable length required is calculated as three times the length of the straightedge, plus an additional eight feet.
- Cable Cutting: The calculated total cable length is cut into two equal lengths.
- Cable Insertion (First End): One end of Cable 1B is fed through the slot in the straightedge cap until approximately six inches extends through the opposite end. (Figure 2 is referenced, but not provided).
- Cable Joining and Pulling Through: The end of Cable 1A is taped to Cable 1B, and both cables are pulled through the system until six inches of Cable 1A extends through the opposite end. The tape is then removed.
The documentation notes the importance of counting and inspecting all pieces before discarding any packaging materials. Specific color and/or size information may be required when ordering replacement components.
Component Identification
The restringing process utilizes specific components, as identified in the documentation:
- Ring Terminal (2)
- Cable (1B)
These components are essential for the proper functioning of the restringing mechanism. The documentation advises contacting a Mayline Customer Service Representative at 1-800-822-8037 for assistance with component identification or ordering.
Specifications and Pricing
The documentation provides the following specifications and pricing information for a specific Mayline Parallel Bar:
- Code: 10149
- MFG Part #: 7263A
- Regular Price: $321.00
- Sale Price: $185.00
- Black phenolic laminate plastic base with inset transparent blade
- Metal or Delrin ball-bearing rollers
- Board mounting hardware and cables
This information pertains to a specific model and may not be representative of all Mayline parallel bars.
Roller Material Recommendations
The documentation explicitly recommends specific roller materials based on the drawing surface being used:
- Steel Rollers: Recommended for use with vellum.
- Delrin Rollers: Recommended for use with film.
Selecting the appropriate roller material ensures smooth operation and prevents damage to the drawing surface.
Conclusion
The Mayline parallel bar is a precision drafting tool constructed with durable materials and designed for smooth operation. The documentation provides detailed instructions for restringing the above-board mechanism, including component identification, cable length calculation, and step-by-step procedures. Users can select from various models—Standard, EZ Grip, and Armoredge—to suit their specific needs. Proper maintenance, including correct roller selection and timely restringing, ensures the longevity and accuracy of the instrument. Customer support is readily available for assistance with component ordering and technical inquiries.