|Catalog Number 10R6A, 15R6A or 30R6A - Rail Drilling Jigs|
Rail Drilling Jigs
Catalog Numbers 10R6A, 15R6A or 30R6A
Drilling Rail for Joiners
To allow the rail to slide into and out of the joint bars during expansion and contraction of the rail with temperature, it is advisable to drill the holes in the rail larger than the size of the bolt being used. Recommended sizes are shown in the table. The drilling jig is normally furnished to drill these sizes of holes and will place the drilled hole so that the side of the hole contacts the bolt when the ends of the rails are against each other as will happen on very hot days. When the rail is being assembled, a gap should be left between rail ends depending on the temperature of the rail at that time. The size of the gap used must depend on your judgment and can be near zero in very hot weather but must be made wider for cooler temperatures.
A stop pin is used to position the jig against the end of the rail (see drawing, shown is the 1" scale jig, others vary slightly). The stop pin is held in place with a set screw and may be removed to allow positioning of the jig at other distances from the rail end. You may also make, or have made, stop pins having a larger or smaller diameter to relocate the drilled hold position.
Position the side of the jig holding the stop pin against the rail, fitting it into the recess provided. Slide the rail end against the stop pin. Close the jig by squeezing the handles. The jig should be closed only firmly enough to keep it from shipping in use. If it is difficult to close, or if it is loose when closed, turn the adjusting screw at the end of the handle while the jig is open and try closing it again.
Align the proper sized drill with the hole in the bushing and slip it into the bushing until it contacts the rail. Begin turning the drill bit and drill the hole (placing the drill into the bushing while stopped will prolong the life of the jig and prevent catching and twisting of the jig).
After drilling both holes, squeeze the release lever, and open the jig.
The jig includes hardened steel bushings sized to fit the specified drills. These bushings are available from larger tool dealers for replacement or from the parts list below. You may also obtain other sizes from dealers if you wish to use other drill sizes. The drill jig bushing require the use of a press for removal or replacement.
Replacement Parts List
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