Macolap micro-finishing stones

the indispensable honing tool for carbide and hss tool resharpening


 

 

Honing the ground edge with a Macolaepp micro-finishing stone

 

 

 


 



It is common knowledge that regrinding is only half the battle to bring a worn cutting tool back to its former efficiency. The grinding wheel is for removing quantities of material and re-forming the cutting edge shape. Magnification of the resulting edge will demonstrate that the cutting edge so formed is far from ready for efficient metal cutting.

 

 This is how a cutting tools edge appears when magnified after re-grinding  
The same edge at the same magnification looks like this after using micro-finishing hand stones.

 

 

Macolaepp micro-finishing hand stones consist of sintered blocks of ultra-hard boron carbide material of closely controlled grit size. Onto these blocks are bonded handles of plastic material moulded to a comfortable and convenient shape for hand finishing cutting tools. These sintered blocks are of unusually high grit density and are robust and tolerant of misuse.

The handles are serrated on top of the work area where pressure is applied by the finger or thumb during use, and are designed to nestle into the palm of the hand to give the operator a high degree of control over angle, pressure and stroke.

Micro-finishing hand stones are available in four colours, each colour denoting a graded grit size for controlled and predictable results.

The use of lubricant is not required with these stones due to the unique high density structure. If desired, however, a light machine oil may be used. The structure is also responsible for the stone's resistance to loading with material when cutting hard or soft substances. Dressing of hand stones is effected simply by rubbing one stone against another.

Four grades of hand stone are available ranging from 130 microns to 25 microns grit size.

       

 Code No.

Grit size

Colour

Recommended

180

130 Microns

Yellow

for large carbide tools

220

100 Microns

Blue

for medium carbide tools

360

50 Microns

Red

for HSS tooling and small carbide tools

500

25 Microns

Green

for HSS tooling and small carbide tools

 

How to use

The hand lapper is used to flatten off ( lap ) the tool's cutting edge at an angle of between 25° and 40°. The "blunt" chamfer is, according to applications, between 0.1 and 0.2mm wide, or up to 0.4mm wide for heavy duty working conditions.

 

link to macolaepp lapping paste page

link to macolaepp honing stones

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