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Double grooved seam. Add W T to the edge of each blank to be joined. Allowance for capping strip = 4 W + 4 T, where L = 2 W + 4 T. Paned down seam. Add W to the single edge 3. Add 2 W + T to the double edge 4. P = 2 W + 2 T. Knocked up joint. Add W to the single edge 5. Add 2 W + T to the double edge 6. K = 2 W + 3 T.
The GROOVED SEAM JOINT (fig. 2-57) is one of the most widely used methods for joining light- and medium-gauge sheet metal. It consists of two folded edges that are locked together with a HAND GROOVER (fig. 2-58). When making a grooved seam on a cylinder, you fit the piece over a stake and lock it with the hand groover (fig. 2-59).
A Knocked Up Joint or Double Seam is commonly used to fix an end to a cannister or food can. The canning industry would normally use a Seaming Machine (see A Dash of Science for further detail) but they were traditionally hand made by Tinsmiths.
Sometimes known as lock seams, they can speed up the assembly process by positioning themselves easily on one axis. Assemblers can quickly join the seams and a welder can clamp and weld into position with ease.
Sep 23, 2020 · SHEET METAL SEAMS TYPES OF SEAMS (FITTER ALLIED TRADE) CLASS-19 FITTER FIRST YEAR WEEK NO. 16 BY PRASANNA GNState the seams.State the types of seams.Sheet me...
Jul 14, 2016 · A knocked down flange typically occurs when a can body with a bent flange enters the seamer. Effectively this creates a false seam. What this looks like using a double seam inspection system (SEAMetal & SEAMscan): Possible causes of a Knockdown Flange: Bent can flange; Damaged or bent end; Mushroomed can flange; Incomplete formation ...
Oct 12, 2017 · Knockup joints are used to create a right angle joint using sheet metal. This joint can be used during the construction of duct work, rainwater tanks, boxes...
