Aluminum blank (161x25x3mm, with ends bevelled at 45 degrees for dovetail fastening) with a glued alder wood strip, intended for use as a lapping surface together with pastes, powders and suspensions of various types of action. Wood lapping surfaces are effective and are most often used for final grinding and finishing operations on very hard steels where working on a bonded abrasive no longer gives the desired result when finishing the approach surface. Sharpening of very hard knife steels (more than 62HRC) requires a weak abrasive bond in order not to spoil the structural matrix of the metal during processing and not to tear out the carbides around the cutting edge, thereby weakening the most important zone (near the RC) of the cutting tool. At the same time, when sharpening hard steels, the course of the bar relative to the RC (on grain or away from grain) is not important, since the cold zone (as it happens in soft steels) does not form and sharpening from grain is as effective as on grain. All this makes wood lappers ideal for working with hard steel knives. Sharpening of relatively soft knife steels on wooden laps also gives an excellent result, however, with the condition that it will be carried out only with “from the grain” movements. Blanks with wooden lapping surfaces are excellent for use with abrasive-type compounds - diamond and elbor pastes (on a fat or water basis), with grinding and finishing suspensions of a tumbling type, for example, HLAD'stone or with adhesive polishing pastes - Dialux, GOI etc. It is also possible to effectively use various kinds of polishing powders for fine finishing operations, for example, based on ceramic corundum. The components of pastes and suspensions are easily retained in the pores of the wood, are easily applied to the work surface and work effectively. The use of water-based pastes and suspensions is just as reasonable and cost-effective as oil-based ones. Pastes and suspensions are retained exclusively in a thin near-surface layer, without causing mechanical stresses in the wood and distortion of the geometry of the lapping surface. Cleaning the surface of wood from the remnants of pastes and sludge is carried out mechanically - either with the butt of a knife, or with the help of a sandpaper fixed on a flat surface. However, if a certain type of paste, suspension or powder is applied to the wood, then further use of this blank is possible only with this compound. Wooden blocks glued to aluminum blanks can also be used to remove burrs at the finishing stages of sharpening. This operation can be performed both with the use of various pastes and without them.
Country of origin Ukraine
Type Aluminum blank with finishing alder
Substrate material wood, alder
Blank Material Aluminum
Blank size with balsa 161x25x9mm
Blank thickness without balsa 3mm
Working plane size 152*25mm
Wood thickness 6mm
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