Laps and lapping tools are used for precision surface finishing, often in conjunction with loose abrasive compounds.
Whether you have a one-piece or two-piece base, the odds are against you that your rings will be in perfect alignment. Why chance putting your scope in a bind, whether it is a $200 scope or a $1000+ scope? The Sinclair Scope Ring Lapping Tools are designed to correct the misalignment of scope rings. The Sinclair Scope Ring Lapping Tool is used to align the rings first and then to remove just enough metal from the scope ring bearing surface to fine tune the alignment. The farther you are from the optical center, the more likely you are to have distortion and a darker sight picture. Sinclair Scope Ring Lapping Tools (1 inch, 30mm, 34mm, 35mm) are made from ground accuracy stock stainless steel that has a tolerance of +/-.0005 inch. Each Sinclair Lapping Tool comes with the lapping bars are 10 inch in length, which gives you plenty of stroke length to quickly lap your scope rings. Sinclair, Issue:5B, Page:215. The farther you are from the optical center, the more likely you are to have distortion and a darker sight picture. Sinclair Scope Ring Lapping Tools (1 inch, 30mm, 34mm, 35mm) are made from ground accuracy stock stainless steel that has a tolerance of +/-.0005 inch. The other form of lapping involves a softer material for the lap, which is “charged” with the abrasive. The lap is then used to cut a harder material—the workpiece. The abrasive embeds within the softer material which holds it and permits it to score across and cut the harder material. Lapping is a machining operation, in which two surfaces are rubbed together with an abrasive between them, by hand movement or by way of a machine. This can take two forms. The workpiece must be at least as hard as the lapping plate, or the abrasive will be charged into the work. It will take from 1 to 20 minutes to complete the machining cycle. Time depends on the amount of stock removed, the abrasive used and the quality required. Grit and plate selection. George Schneider, Jr., is the author of Cutting Tool Applications, a handbook to machine tool materials, principles, and designs. He is the Professor Emeritus of Engineering Technology at Lawrence Technological University, and former Chairman of the Detroit Chapter of the Society of Manufacturing Engineers. Lapping is a machining process, in which two surfaces are rubbed together with an abrasive between them, by hand movement or using a machine. The small plate shown in the first picture is a hand lapping plate. That particular plate is made of cast iron. In use, a slurry of emery powder would be spread on the plate and the workpiece simply rubbed against the plate, usually in a figure-eight pattern. Laps and lapping tools are used for precision surface finishing, often in conjunction with loose abrasive compounds. Lap is a soft material that is charged with an abrasive and is used for cutting harder material. A lapping machine uses a charged lead piece as lap for cutting a hardened steel piece. A lapping ring tool is a tool used to set the ring properly in the piston grooves. Other laps and lapping tools are commonly available. There are several ways in which laps and lapping tools function. A cast iron plate, called as lapping plate is smoothened using a lapping tool placed in the lapping machine. Emery powder is sprinkled on the cast iron plate and the workpiece is then rubbed against the cast iron plate to provide finishing to the surface. There are many types of laps and lapping tools. Examples include, a flat lapping tool, a valve lapping tool, a barrel lapping tool, and a lapping ring tool. A flat lapping tool is used to generate extremely flat and smooth surface on workpieces of carbon, ferrous, and non-ferrous metals. A lapping ring tool is a tool used to set the ring properly in the piston grooves. Other laps and lapping tools are commonly available. There are several ways in which laps and lapping tools function. The other form of lapping involves a softer material such as pitch or a ceramic for the lap, which is charged with the abrasive. The lap is then used to cut a harder material — the workpiece. The abrasive embeds within the softer material, which holds it and permits it to score across and cut the harder material. The small plate shown in the first picture is a hand lapping plate. That particular plate is made of cast iron. In use, a slurry of emery powder would be spread on the plate and the workpiece simply rubbed against the plate, usually in a figure-eight pattern.
http://www.brownells.com/gunsmith-tools-supplies/sight-scope-installation-tools/scope-alignment-rods/sinclair-scope-ring-lapping-kits-prod36022.aspx http://www.brownells.com/gunsmith-tools-supplies/sight-scope-installation-tools/scope-alignment-rods/sinclair-scope-ring-lapping-kits-prod36022.aspx http://ablap.com/home/what-is-lapping/ http://americanmachinist.com/machining-cutting/cutting-tool-applications-chapter-18-lapping-and-honing https://en.wikipedia.org/wiki/Lapping http://www.globalspec.com/learnmore/materials_chemicals_adhesives/abrasives_abrasive_products/laps_lapping_tools http://www.globalspec.com/learnmore/materials_chemicals_adhesives/abrasives_abrasive_products/laps_lapping_tools https://en.wikipedia.org/wiki/Lapping
what is a lapping tool