. How to make and use match plates .. . h properly. Often in ad-justing the flask pins, the cope may beshifted to one side or the other and a mouldmade from this flask will show an offset,as the cope half of the mould will not bedirectly over the drag half of the made in this mould would be ac-curate enough if the mould could be pouredwithout a jacket, but in pressing a jacketdown over a mould the cope half of themould will shift over to match with thedrag half of the mould, thus causing ashift in the casting. This does not occurin straight snap moulding, as a straightjacket sha
. How to make and use match plates .. . h properly. Often in ad-justing the flask pins, the cope may beshifted to one side or the other and a mouldmade from this flask will show an offset,as the cope half of the mould will not bedirectly over the drag half of the made in this mould would be ac-curate enough if the mould could be pouredwithout a jacket, but in pressing a jacketdown over a mould the cope half of themould will shift over to match with thedrag half of the mould, thus causing ashift in the casting. This does not occurin straight snap moulding, as a straightjacket shaves the sides of the mould, andan offset of this kind will be shaved offwhen the jacket is pressed down overthe mould. In ordering snap flasks forstandard work, save all the sand round casting should not be made in asquare flask any more so than a squarecasting should be made in a round jackets are a paying propositionin taper snap work, and the new adjustablejacket which is on the market has manygood Flywheel mould ready for CONTENTSChapter 1—Judgment in Making Equip-ment. The first point to be considered, Equipment made without profit. Estimate 2—Proper Type of Plate. Compounds in plate work. Patterns on stripping plate. Patterns with pockets. Proper size snap flask. Proper gating. MetaJ for master cored 3—Making a Plate. Proper grade of sand. Care used in making parting. Screw used to draw patterns. Patterns with one straight 4—Forming the Plate. Frames used to form the plate. Proper thickness for plate. Introducing a foreign joint. Shrinkage. Proper heat for 5—Iron Plates. Moulds dried. Value of aluminum in 6—Split Patterns. Wood plates in stock. Patterns riveted to plate. Simple system of matching patterns. Aluminum preferable. Loose pieces dovetailed to 7—Snap Flasks. Taper snap flasks. Cope not in line wit
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