Laying Down and Taking Off by Charles Desmond

Author:Charles Desmond
Language: eng
Format: epub
Publisher: The Rudder publishing company
Published: 1919-03-25T05:00:00+00:00

space distance on a board and then by measuring distance between frame outlines, at 'certain selected points and along certain designated lines, and using this measure as a guide for adjusting a bevel, he can accurately lay out frame bevels and transfer them to a bevel board.

The tools used for setting down bevels are an adjustable armed bevel and board made as shown at left hand of Fig. 30, This bevel is mounted on a board having a width equal to room and space, in the manner shown on illustration. The bevel is placed about ^ inch above board it is mounted on, thus permitting a ^-inch thick piece of wood to be inserted under bevel with its ei^^ against guide to which movable arm is attached. On illustration a ^-inch piece of wood is shown in position under movable arm. With these tools and a rule the mould loftsman takes his bevels in this manner.

The mould loftsman has already laid out and faired the lines, taken off thickness of planking and marked the full-sized outline shapes of all frames on floor. He next lays out on the frame outlines, at proper inclinations and at proper positions, a certain number of diagonal lines, these lines being marked as near as possible at right angles to frame outlines and at positions where end of eadi fut-tock of frames will come.

On Fig. 34 these diagonal lines are marked and at edge of outline I have also marked the name of futtock that will end at each line. It is along these lines that distance between frame outlines is measured.

Bevels taken along each diagonal are usually marked on the same piece of wood, though there may be three or more pieces used for a diagonal, one beii^ for forward and after cant frames, another for forebody frames, another for square body frames, and another for after body

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in such a manner that the ship-carpenter can use his [| record as a guide for beveling frames before they are assembled and put in place in vessel. '

The way frame timber bevels are taken and recorded is explained below.

On Fig. 34 I show a few of the forward body frames of a wooden vessel {as laid down on mould loft floor) and for the purpose of making my explanation clear I give you the information that frame spacing (from center to center) is 36 inches. This is the "room and space."

It stands to reason that if each frame outline shown on a body plan of vessel is a known equal distance apart (in this case 36 inches) the distance from outline shape of one frame to outline shape of the next will accurately represent the amount of decrease in width of vessel at that point and in that distance (36 inches). Therefore, knowing the room and space (36 inches in this case), all that mould loftsman has to do is to lay off the room and

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LAYING DOWN AND TAKING OFF

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