Drill Bits 1.5 to 6.5 mm HSS 5% cobalt- 13 peices

Drill Bits 1.5 to 6.5 mm HSS 5% cobalt- 13 peices

drill-bits-1-5-to-6-5-mm-hss-5-cobalt-13-peices

This microbox have 10 drill bits in a convenient package each drill is made of high speed steel and this brand are 5% cobalt which gives extra strength to an already strong dril bit

$20.00

Drill Bits 1.5 to 6.5 mm HSS 5% cobalt- 13 peices

 

This HSS Drill set(high speed steel )has 13 drill bits in a convenient package each drill is made of high speed steel and this brand has 5% cobalt which gives extra strength to an already strong dril bit.

1.5mm 2mm 2.5mm 3mm 3.2mm 3.5mm 4mm 4.5mm 4.8mm 5mm 5.5mm 6mm 6.5mm

Drill Manufacturing Process

For high quality products and stable supply, we have several inspection processes in our drill manufacturing system.
Within this content, you can see the manufacturing process of under cut drills (UC type) for an example.

1. Incoming inspection (Tungsten carbide rod)

Check point in this process Fig.1
TRS strength test (Fig.1)
Removal of defective rod (Visual inspection)
SPC method
Check sheet
Inspection sheet

2. Cutting process of carbide rod

Check point in this process  Fig.2
Length of carbide chip (Fig.2)
SPC method
Cut-off check sheet

3. Composite process of carbide chip

Check point in this process
Overall length (Fig.3)
Shank to body concentricity
Tensile strength
Fig.3
SPC method
Assembly check sheet

4. Manufacturing process of drill blank

Check point in this process  Fig.4
* “Drill blank” means the material befor cut flute
Diameter
Undercut diameter
Shank diameter
Cylindricity
Shank to body concentricity
SPC method
Blank check sheet

5. Intermidiate inspection of blank

Check point in this process  Fig.5
Diameter (1)
Undercut diameter (2)
Shank diameter (3)
Appearance
SPC method
Blank inspection report

6. Cutting process of flute, relief and point

Check point in this process
Web thickness
Body clearance
Margin width
Margin length
Helix angle
Point angle
Primary angle
Secondary angle
Overall length
Flute land ratio
Flute length
Body length
Chisel point inconcentricity
Web taper
Fig.6
SPC method
Check sheet

7. Cleaning process

Check point in this process
No dust.
No cutting oil.
SPC method
Cleaning solution check sheet

8. Final inspection of drill (Automatic AOI)

Check point in this process
Flute length
Overall length
Margin width
Margin length
Chisel point inconcentricity
Body clearance
Web thickness
Helix angle
Point angle
Body length
Gap, Overlap
Primary flare, Primary taper
Chipping
Appearance
SPC method
Inspection sheet
Inspection report
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