This section is from the "Modern Machine Shop Construction, Equipment, And Management" book, by Oscar E. Perrigo. Also see Amazon: Modern Machine Shop Construction, Equipment, And Management.
Considering these conditions, the best arrangement of pattern racks seems to be of the forms shown in Fig. 113 and Fig. 114. The form shown in Fig.
Fig. 113. Pattern Storage Rack with Metal Frame with Wood Shelves.
113 is composed of two heavy cast iron bases, into which are screwed pieces of 3-inch wrought iron pipe. Upon these are fitted cross supports of cast iron with rough-cored holes. They are held at any desired height by two set screws in each support. Upon these supports the shelves are built, their thickness being according to the weights of patterns to be stored. For ordinary patterns the shelves should be of -inch planks, and the distance between supports not over eight feet. Where heavy patterns are to be placed on the shelves the planks should be 1« inches thick, and the distance between supports reduced to about six feet. In this case set screws should not be depended upon to hold the cross supports in place. Pieces of wrought iron pipe, large enough to easily slip over the upright supporting pipes, and cut the exact length necessary, should be used, by first placing one over the pipe and resting on the cast iron base. Then put on the cross support, then another piece of pipe, and so on to the top. The planks are fastened with heavy wood screws passing up through the cross supports. The bases should be fastened to the floor with lag screws.
If inconvenient to construct these tracks with iron supports as just described, they may be constructed entirely of wood. If this is to be done the uprights are fastened to the floor and also to the overhead timbers by nailing, or, still better, by iron knees and wood screws, so as to be held firmly in their proper position, as shown in Fig. 114. To these uprights are spiked cross pieces or supports of the form shown, and upon these are laid plank shelves as described for the shelves when iron supports are used. If the patterns are very heavy, the cross supports may be let into recesses in the uprights, and fastened with through and through bolts. The proper distance between supports will be the same as with the iron construction of supports. For ordinary and usual conditions the vertical distances will be about as follows: From the floor to the top of the first shelf, two feet; from the top of the first shelf to the top of the second, twenty-two inches; to the next, eighteen inches; to the next, sixteen inches; to the next, fourteen inches; and to the top, twelve inches. Of course these shelves may be continued higher up than this, but on account of the difficulty of access the above arrangement would seem to be quite high enough.
Fig. 114. Pattern Storage Rack, all Wood Construction.
Several light step ladders should be provided for conveniently reaching the patterns on the upper shelves. Obviously, the heavier patterns will be placed on the lower shelves. Large gears, pulleys, balance wheels, etc., may be set on edge, in racks similar to those used for holding rolls of belting, but are somewhat more liable to become warped than if they are laid down flat on the shelves that are true and level.
In the case of the double-width shelves, as called for in the plan, Fig. 109, there should be two upright pieces of wrought iron pipe to carry the cross supports, the latter being made of appropriate form, and having cored in it two holes, four feet apart, from center to center. A similar modification should be made in the wooden construction. For racks of 18 feet in length there should be three supports, the outer ones placed thirty inches from the ends, and the third one in the center. This will provide for three wrought iron pipe supports in a rack 4 feet by 18 feet, and for six supports to a rack that is 9 feet by 18 feet.
One of the greatest conveniences of this system of shelves for storing patterns is the fact that they are free of access on all sides, with absolutely no obstruction whatever, either to light or the handling of patterns, while their appearance is much better than any of the older forms. Shelves should not be built against walls unless they are comparatively narrow, as the light will be so much obstructed as to prevent seeing the patterns at the back of the shelves. If built as herein described and located between the windows as shown, they offer little obstruction to the light, which passes comparatively free from side to side of the building.