Page:Sheet Metal Drafting.djvu/124

110 53. Planning for Quantity Production of an Ash Barrel.— In planning for quantity production, a draftsman must consider every item that has to do with the manufacturing processes to be carried on in the shop. In order to do this intelligently he should make a list of these items similar to the one given below:  Dimensions of barrel Type of hoop to be used Blank for body:  Weight of material Height after deducting hoops Riveted or locked seams  <li>Weight of bottom</li> <li>Type of slat to be used</li> <li>Number of slats required</li> <li>Sizes of rivets required:</li> <ol style="list-style-type:lower-alpha;"> <li>For attaching slats</li> <li>For attaching upper rim</li> <li>For attaching lower rim and bottom</li> </ol> <li>Pattern for body:</li> <ol style="list-style-type:lower-alpha;"> <li>Over-all dimensions</li> <li>Allowance for lock</li> <li>Locating rivet holes for slats</li> <li>Locating rivet holes for upper hoop</li> <li>Locating rivet holes for lower hoop</li></ol> <li>Pattern for upper hoop and lower hoop:</li> <ol style="list-style-type:lower-alpha;"><li>Length of blank required</li> <li>Method of joining ends</li> <li>Spacing rivet holes</li></ol> <li>Pattern for bottom:</li> <ol style="list-style-type:lower-alpha;" > <li>Allowance for flanging</li> </ol> <li>Pattern for slat:</li> <ol style="list-style-type:lower-alpha;"> <li>Miter cut</li> <li>Size and location of rivet holes</li> <li>Size of wooden core</li> </ol> <li>Order in which parts are assembled</li> </ol>

Dimensions of Barrel.—The dimensions of the barrel would vary according to whether the job was standard, or special size. Different manufacturers have established their own standards. The sizes given below are common to all, and are best adapted to ordinary needs. A barrel 18 in. in diameter by 26 in. high will be treated in this discussion.