Drill Bit Cutting Parameters
Parameters for drilling and slot drilling. Conditions for Drilling in the chart are available.
Notice:
- Hits, number of repoints and stack heights are for general information. They should be determined by hole quality.
- Where the board thickness and/or stack height are not shown in the table, please contact Union Tool's Technical support team.
- These parameters can be affected by the condition and performance of both the spindle and drilling machine.
- The pressure foot and vacuum performance of the drilling machine can affect hole quality. Periodic inspection, maintenance and measurement is strongly recommended.
- The thickness of the entry and back-up board, together with the material type can affect the drilling conditions and care should be taken to choose and appropriate product.
- More detailed information can be found in each parameter file.
| Standard Drilling | ||
| PCB Material | FR-4 | Double sided & 4-layer 6 & 8-layer |
| FR-4 High-Tg | Double sided & 4-layer 6 & 8-layer |
|
| FR-4 Halogen-free | Double sided & 4-layer 6 & 8-layer |
|
| CEM-3 | Double sided | |
| Package substrate | Double sided & 4-layer | |
| High multilayer PWB | 10-layer and above | |
| Automotive PWB | Double sided to 8-layer | |
| Flexible PWB | Double sided | |
| PTFE PWB | Double sided | |
| Maximum Spindle Speed | 300krpm (ø2mm shank K-series drilling parameter) | |
| 200krpm | ||
| 160krpm | ||
| 125krpm | ||
| 100krpm | ||
| Reference Data | Drill Bit Wearing Investigation between D/S to 10 layers PWB PDF （at0062.pdf, page28, 2.17MB） |
|
| Slot Drilling | |
| Slot Drilling Parameter | For Short Slot Drilling （cutting-p_below2D.pdf, page1, 165KB） |
| For Long Slot
Drilling (cutting-p_above2D.pdf, page1, 176KB） |
|
| Terms for drilling parameter | ||
Terms |
Major units |
Meanings and formula |
| Spindle speed | rpm | Number of revolution per minute |
| Velocity | m/min mm/sec Inch/min(IPM) Feet/min(SFM) |
Velocity of periphery V=π·D·N / 1000 V: Velocity [m/min] D: Drill bit diameter [mm] N: Number of revolution per minute [rpm] SFM: Surface feet per minute 1m/min = 3.28 Feet/min |
| Infeed rate | m/min mm/sec Inch/min(IPM) |
Vertical speed of drilling |
| Chipload | µm/rev Mil/rev |
Feed amount per revolution f =F/N x 1,000,000 f :Chipload [µm/rev] N:Number of revolution per minute [rpm] F:Infeed rate [m/min] |
| Retract rate | m/min mm/sec Inch/min(IPM) |
Retract speed after drilling |
| Depth into back-up board | mm Inch |
Penetration depth into back-up board. Too Shallow causes a risk of not drilling through the PWB. And too deep can cause registration accuracy, roughness, and breakage problems. |
| Hits | - | Life of drill bit. This parameter table shows the general values inputted into drilling machine. |
| Repoint (Number of repoints) | - | Generally, the tip of drill bit is repointed after use, having deteriorated through wear. This parameter table shows the general information for repointing frequency. |
| Stack height | - | To improve productivity the PWB is often stacked up for drilling. This parameter table shows the general number of panels per a stack for each general PWB thickness. |
| Unit Conversion | |
| Distance | 1m = 1000mm = 39.37Inch 1Inch = 0.0254m = 25.4mm |
| Velocity, Infeed rate, Retract rate | 1m/min = 16.67mm/sec = 39.37Inch/min = 3.28Feet/min(SFM) 1mm/sec = 0.06m/min = 2.36Inch/min 1Inch/min = 0.0254m/min = 0.423mm/sec |
| Chipload | 1µm/rev = 0.0393Mil/rev 1Mil/rev = 25.4µm/rev |
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