Fine Sharpening Lathe Tool

Fine Sharpening Lathe Tool

  • (1)Fine Sharpening Flute: In order to make the shape of flute more precision, and surface roughness is finer than before, so flute should be fine sharpened after rough sharpening. The sharpening method is the same as rough sharpening.

 

  • (2)Sharpening Negative Chamfering: Negative Chamfering is commonly sharpened by end of grinding wheel, the granularity between 100# to 200#. The sharpening method as follow the figure :
 Fine Sharpening Lathe Tool Sharpening Negative Chamfering

Negative Chamfering

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The Standard Sharpening Method of Lathe Tools

The Steps of Sharpening Lathe Tool

Step 1: Sharpening the major flank face, at the same time, sharpening lip relief angle;
Step 2: Sharpening the minor flank face, at the same time, sharpening end relief angle;
Step 3: Sharpening the fake face, at the same time, sharpening point angle;
Step 4: Sharpening remained faces and the tip;

 

The Methods of Sharpening Lathe Tool

Now, PURROS Machinery takes the rough grinding carbide alloy cutter as an example, to illustrate the method of cutting tool sharpening.

1.  Rough sharpening the major flank face and the minor flank face, at the same time, major angle of declination, major lip relief angle, minor angle of declination, and minor lip relief angle also has sharpened. The angle of major lip relief angle and minor lip relief angle by rough sharpening should be bigger than requested. View Figure:

Rough sharpening the major flank face and the minor flank face

Lip Relief Angle of Shank

(a) Lip Relief Angle, behind the major flank face of shank
(b) Lip Relief Angle, behind the minor flank face of shank

 

2. Rough Sharpening Rake Face: Rake Face and Flute are sharpened at the same time, before flute is sharpened, used the end face of grinding wheel to rough sharpen, to obtain the necessary angle and surface roughness.

3. Sharpening Flute: Flute can be sharpened by edge of flat grinding wheel, as Figure shows the sharpening method. Generally, the position of rough sharpening should be began half of between flute and drill bit tip.

Sharpening Flute: Flute can be sharpened by edge of flat grinding wheel, as Figure shows the sharpening method.

Rough Sharpening Flute

(a) Sharpening Down (b) Sharpening Up

 

The Notes of Lathe Sharpening by hand.

The Notes of Lathe Sharpening

  1. Please note that operator should stand on the side of the lathe tool grinder, to prevent hurtful from debris if the grinding wheel is broken.
  2. Keeping enough distance to hold the shank of lathe tool between hands, to tighten the waist with two elbows to reduce the shaking of the lathe tool sharpening.
  3. During sharpening lathe tool, please place the lathe tool on the horizontal center of the grinding wheel, and the tip of the lathe tool is slightly upward about 3°-8°, when the lathe tool touches the grinding wheel that the lathe tool should be moved around horizontally.
  4. During sharpening major flank face, the lathe tool shank should be shifted an angle to the left as major cutting edge angle; during sharpening minor flank face, the lathe tool shank should be shifted an angle to the right as minor cutting edge angle.
  5. During sharpening arc of the tip, generally, holding the tip of lathe tool with left hand as a fulcrum, and at the same time, moving the shank of lathe tool with right hand.

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How to select the grinding wheel before sharpening the lathe tools?

How to select the grinding wheel?

How to select the grinding wheel before sharpening the lathe tools?

Grinding wheel

Rough grinding lathe tool should be selected the grinding wheel with smaller abrasive grains, on the contrary, fine grinding lathe tool should be selected the grinding wheel with bigger abrasive grains. When sharpening lathe tool of HHS, it should be used the granularity between 46 and 60, or soft aluminum oxide grinding wheel. When sharpening carbide-tipped lathe tool, it should be used the granularity between 60 and 80, or soft Sic grinding wheel. Tips: Do not confuse the two different grinding wheels.

How does the twist drill bit sharpen can be more sharper?

The twist drill bit is the most commonly used cutting tool, the twist drill bit wants to be sharpened, so pay attention to some points below to:

For mechanical processing, twist drill bit is the most important of drilling tool, in all itsstructure simplicity,but it’s not easy to sharpen it right. The keypoint is to master the sharpening methodsand skills.If the method is mastered, the problem will be solved.Let me introduce the manual grinding of twist drill bit.

Usually, the point angle of twist drill bit is about 118°,it could also be treated 120°, the sharpening skills as follows:Continue reading

How to use the Drill Bit Grinder?

1. First, check the material of the drill bit, because it is used to select the appropriate grinding wheel(types of grinding wheel: CBN and SDC; CBN for HSS(High Speed Steel), SDC for Carbide), that to be assembled the drill bit grinder.

2. Second, checking the diameter of drill bit, and then to select the appropriate collet chuck. In general, the types of collet chuck as follow: ER20, ER25, and ER40, but the exact dimensions are subjected to the manufacturer’s standard.

3. Third, clamping after selecting collet chuck, and adjusting the measurement of grinding, then you should to press the power button to start the drill bit grinder, now observing the situation of the operation drill bit grinder.

4. Fourth, if the situation of drill bit grinder is working properly, next step to grind the drill bit. The step below to:
1. Point Angle Grinding
2. Chisel Edge of Point Angle Grinding
(Note: The size of chisel edge of point angle depends on the screw above the dead center grinding hole of grinder, which can be adjusted the size. Also the adjusting range depends on the diameter of the drill bit.)Continue reading