In version 7.0.4 and later of MiTek® 20/20® Component Design, a new feature has been added to allow users to easily specify JackRabbit plating for open jack trusses therefore eliminating the need to manually change the plate orientation. The JackRabbit is a coil-fed joint assembly machine used to produce multiple jack trusses. Coils can be purchased 1.0, 1.5, 2.0, and 3.0 inch widths and can be cut up to 6 inches in length.
The rules for the new JackRabbit plating are as such:
- This plating option is for use on trusses with a single plated joint only - open jacks.
- The plate will be placed perpendicular to the top chord.
- Only the MT20 plate will be used. The program will use the design values for standard MT20 plates for each size available. For example, using the above default settings, the program would use a 3x3, 3x4, 3x5, or 3x6 plate at the joint.
- Version 7.0.4 will plate only non-wedged joints with the JackRabbit feature and Version 7.0.5 and later will plate wedged and non-wedged joints with the JackRabbit feature.
- With the new feature, comes a new rule for the requirement of wedges. In previous versions the requirement was 2.5" or greater of horizontal scarf length before it would not place a wedge. Anything below this would require a wedge at the heel. The new requirement has been lessened to 1.5" or less for JackRabbit plating before a wedge is required. If for any other reason that additional heel support is required, the special plating option is also not applied.
The JackRabbit option is set under the Plate Options dialog box, and is available at all default levels: Manufacturer, Job and Truss.
Once checked, this special plating option is turned on and the default settings can be set.
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