2018 PURROS New Product Launch Ceremmony – PG-F4N Complex Grinder for End Mill and Drill

Some improved performances of PG-F4N is compared with PG-F4

Improved Points as below (PG-F4N Advantages):

1. For grinding drill bit, the maximum grinding diameter increased to φ15
2. Point Angle Grinding Ranges: For End Mill, extended from 0°~5° to 0°~7°; For Drill, extended from 100°~135° to 95°~150°
3. Motor Power: Increased from 180W to 200W
5. Rotating Speed: Increased from 4800RPM to 5000RPM
6. Grinding Wheel: For End Mill grinding, multiple directions can be used; For Drill Bit Grinding, the diameter of grinding wheel is increased to 80mm
7. 2-flutes, 3-flutes, 4-flutes, and drill bit are also equipped their own collect chuck.
8. More accurate presetting cutter device

Earlier Version (PG-F4 Complex Grinder)
Model:	End Mill	Drill
Ranges:	Φ4-Φ14MM	Φ3-Φ14MM
Point Angle:	0°~5°	100°~135°
Voltage:	AC220V
Power:	180W
Rotate Speed:	4800RPM
Dimension:	372330CM
Weight:	20KG

New Version (PG-F4N Complex Grinder)
Model:	End Mill	Drill
Ranges:	Φ4-Φ14MM	`Φ3-Φ15MM`
Point Angle:	`0°~7°`	`95°~150°`
Voltage:	AC220V
Power:	`200W`
Rotate Speed:	`5000RPM`
Dimension:	`463231CM`
Weight:	`25KG`

Drill bit geometry has several characteristics

The diameter-to-length proportion of the drill bit is normally in between 1:1 as well as 1:10. A lot greater proportions are feasible (e.g., “aircraft-length” twist bits, pressured-oil gun drill bits, and so on), however the greater the proportion, the higher the technological obstacle of creating great.

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Solutions Summary of Common Drilling Problems (Relationship with the Good or Bad Grinding Drill Bit)

In the actual production, PURROS Machinery has collected mass customers’ problems about grinding drill bits by hand (manual grinding drill bits), now, list the summary of the problems and how to solve as bellow for your reference and study. In the actual production, PURROS Machinery has collected mass customers’ problems about grinding drill bits by hand (manual grinding drill bits), now, list the summary of the problems and how to solve as bellow for your reference and study.

Solutions Summary of Common Drilling Problems

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The Check of Standard Twist Drill Bit after Grinding

Step 1: Checking the point angle (cutting lip angle) of standard twist drill bit is correct or not, and whether it is symmetric with the axis of the standard twist drill bit? (The correct point angle of standard twist drill bit is ±118°, if it be used to drill harder materials that the point angle can be extended to 120°; if there are the softer materials, the point angle should smaller than before, but keep mind, do not smaller than 90°.)

Step 2: To check the length and height of two major cutting lip (major cutting edge) are consistent. Because the quality of the machined holes are affected by whether the length is the same.
The check method for step 1 and step 2 is that: Place the cutting part of twist drill bit keeps in a vertical position, keep eyesight at the horizontal level, and then repeatedly rotate 180°, where is the center axis of standard twist drill bit, to observe whether the length of two major cutting lips are same in rotation. It is an assumption that to observe the length of two major cutting lips at the center of axis; If the lengths of two major cutting lips are different, that the shorter side should be grinded.Continue reading→