Lapping Kit 05M01.01Lapping Kit 05M01.01

Contents Contents Five 2-ounce containers of 90x, 180x, 280x, 400x and 600x silicon Five 2-ounce containers of 90x, 180x, 280x, 400x and 600x silicon carbide particles. carbide particles.

Background Background Lapping is the process of rubbing two surfaces together with an abrasive Lapping is the process of rubbing two surfaces together with an abrasive and a lubricant to improve the quality of at least one of the surfaces. and a lubricant to improve the quality of at least one of the surfaces. Lapping can be used for fl attening (or truing) a surface, such as a worn Lapping can be used for fl attening (or truing) a surface, such as a worn sharpening stone. Lapping can also minimize the roughness of a surface sharpening stone. Lapping can also minimize the roughness of a surface (i.e., surface conditioning), such as a plane sole or blade. By minimizing (i.e., surface conditioning), such as a plane sole or blade. By minimizing the roughness in the sole of a plane, there is reduced friction between the the roughness in the sole of a plane, there is reduced friction between the plane and the workpiece, which in turn reduces abrasion. For blades or plane and the workpiece, which in turn reduces abrasion. For blades or chisels, the cutting edge can be made sharper if both intersecting surfaces chisels, the cutting edge can be made sharper if both intersecting surfaces are free of scratches. are free of scratches.

Choosing an Abrasive Choosing an Abrasive Although any grit will provide adequate results for any application, each is Although any grit will provide adequate results for any application, each is best suited to a particular application. best suited to a particular application.

Guidelines Guidelines 90x 180x 280x 400x 600x 90x 180x 280x 400x 600x Shaping Stones zz{ Shaping Stones zz{ Truing Stones {z Truing Stones {z Flattening Soft Metals {zz Flattening Soft Metals {zz Flattening Blades and Soles zz Flattening Blades and Soles zz Conditioning Plane Soles z{ Conditioning Plane Soles z{ Conditioning Blades {z Conditioning Blades {z z - Preferred grit z - Preferred grit { - Optional grit { - Optional grit Note: For truing stones, start by shaping with 90x or 180x and fi nish Note: For truing stones, start by shaping with 90x or 180x and fi nish with 280x. Finer grits are not necessary and will imbed in the stone and with 280x. Finer grits are not necessary and will imbed in the stone and contaminate it. After lapping, use a stiff brush with soap and water to contaminate it. After lapping, use a stiff brush with soap and water to clean the stone. clean the stone. Selection of a Lap Selection of a Lap The fl attening (or truing) of a water stone should only be done on a plate The fl attening (or truing) of a water stone should only be done on a plate glass lap using water as the lubricant. Oil will ruin a water stone, as will glass lap using water as the lubricant. Oil will ruin a water stone, as will the oxides created by lubricating a ferrous lap with water. the oxides created by lubricating a ferrous lap with water.

For the lapping of metals, there is a range of possible lap surfaces that may For the lapping of metals, there is a range of possible lap surfaces that may be used. In order of preference, these are: be used. In order of preference, these are: • A purpose-made gray iron lap with a ground and grooved surface. • A purpose-made gray iron lap with a ground and grooved surface. • A milled gray iron casting. • A milled gray iron casting. • A piece of plate glass. • A piece of plate glass. • A mild steel plate. • A mild steel plate. • A piece of close-grained hardwood. • A piece of close-grained hardwood.

Ferrous or hardwood laps should be lubricated with oil. Plate glass may be Ferrous or hardwood laps should be lubricated with oil. Plate glass may be lubricated with oil or water, depending upon the application. lubricated with oil or water, depending upon the application.

Lapping Methodology Lapping Methodology Lapping entails moving the object around on the lap surface until you have Lapping entails moving the object around on the lap surface until you have achieved the desired condition. The exact technique used is up to whoever achieved the desired condition. The exact technique used is up to whoever is lapping and what feels comfortable. is lapping and what feels comfortable. • Optimal results are achieved when the object is moved about the • Optimal results are achieved when the object is moved about the lap in a long, slow figure-eight pattern. This technique continuously lap in a long, slow figure-eight pattern. This technique continuously redistributes the slurry around the lap, keeping it uniformly oiled and redistributes the slurry around the lap, keeping it uniformly oiled and producing the best results. producing the best results. • The stroke pattern should cover the entire lap and extend beyond the • The stroke pattern should cover the entire lap and extend beyond the edge of the lap a few times. Not only does this help in extending the edge of the lap a few times. Not only does this help in extending the life of the lap, but it also pushes any large abrasive particles off the life of the lap, but it also pushes any large abrasive particles off the lap, preventing subsequent scratching. lap, preventing subsequent scratching. • Avoid adding grit halfway through a lapping session. The abrasive grit • Avoid adding grit halfway through a lapping session. The abrasive grit becomes finer over time. Adding grit increases the time needed to lap, becomes finer over time. Adding grit increases the time needed to lap, and does not improve the results. and does not improve the results. • A well-lubricated surface is essential to quality lapping results. Over • A well-lubricated surface is essential to quality lapping results. Over time, the lap will naturally lose lubricant. Allowing the lap to dry out time, the lap will naturally lose lubricant. Allowing the lap to dry out can spoil both the lap and the object being lapped. can spoil both the lap and the object being lapped.

814 Proctor Avenue 1090 Morrison Drive 814 Proctor Avenue 1090 Morrison Drive Ogdensburg, New York Ottawa, Ontario Ogdensburg, New York Ottawa, Ontario 13669-2205 USA K2H 1C2 Canada 13669-2205 USA K2H 1C2 Canada 321 [email protected] INS-049 Rev. C 321 [email protected] INS-049 Rev. C © Veritas Tools Inc. 2008 www.veritastools.com Printed in Canada. © Veritas Tools Inc. 2008 www.veritastools.com Printed in Canada.