Drill grinding gauge(1)  |
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| When sharpening the blade, you can see the cutting edge angle and both
the left and right balance(the cutting angle can be replaced by 90°118°135°180°) 。We have been using it for about 25years, but recently, the automatic grinding machine is mainly used. |
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Drill grinding gauge(2)   |
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| Confimation template of the clearance anlgle, confirm with the template before hitting the second one.(if you can freely shrpen this, you are Professional?・?・?・?）. | |
Drill grinding gauge(3)   |
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| Taper shank drill. Check the height of shoulder(Black paint is applied on aluminum material.)Compare the height of the left and right shoulder, inserting a marker line on the painted surface with the shoulder of the drill. | |
| Sharpening method(1) | |
 The work is complete if the cutting edge angle of the drill and the balance of the right and left are correct. |
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| There is also such a method for those who are not satisfied with the turmout. |
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| Rake a rake angle from 2/3rd of the cutting edge of the chisel portion, which occupies most of the thrust load of the drill. | |
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| By changing the rake angle of this part, the sharpness of the drill increases. ・There is a track record of raising the feed to 0.8r・e・v with a drill ofφ65without pilot hole in SUS304. ・It was effective for sticky materials such as SUS, aluminum, copper. ・It's useful when delicate sharpness is necessary, such as when using chamfer drill. ・For drilling with a weak machine. |
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| Mechanical polishing.(It has the sharpness that can't be attained by hand
sharpening) |
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Used drill grinding machine. Toyo Machinery Co,Ltd. Doripetto Drill used φ6.8 NACHI G standard 材質Material SUS304 ｔ１２.7penetration conditions S＝460ｒｐｍ F＝119mm/min V＝9.8 0.26rev(considerably high feed) Cutting oil Chlorine-based mineral oil Drill life 720～840hole（9.1～10.7M） |
| Throwaway drill | |
  We think the skill of sharpening the drill is important, but the throwaway drill era has arrived.   Throwaway drill material of φ38Material of SUS and chip（V＝100rev＝0.12） (We have tested various intemational and domestic manufacturers, but SUS304is the best Kyocera Magic Drill at this time) |
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Endmill grinding skater  |
| We used it when re-grinding the cutting edge to check the height of the
cutting edge by double-edge milling.(about0.02can be seen) Made in 1978, it is convenient to have one. |
