CNC Drilling Carbide Spot Drill Bit Sharpen NC
|Unit Price:||1 USD|
|Min. Order:||10 Piece/Pieces|
|Packaging:||1piece in a plastic pipe ,10pieces per group and air bubble paper in a carton to reduce the shock.|
|Place of Origin:||Changzhou,Jiangsu|
CNC Drilling Solid Carbide Spot Drill Bit Sharpen NC Spot Drill
About Spot Drills
A spot drill typically has a tight tolerance point geometry with a very short flute length.
It is important to know that a spot drill has no land or body relief, and is NOT designed to drill past the depth of the point angle, which is just enough to drill an detent or "dimple" in the workpiece.
Spot drills are used to improve the accuracy of secondary drill operations but they can be used as a chamfering tool if the spot drill diameter is larger than the final hole size.
Ideally, the spot drill diameter should be about 70% of the size of your final drill diameter. The spot drill point angle should be greater than or less than the final drill’s point angle.
- Spot drilling is not recommended in hardened steels.
- Contacting the corners of the carbide drill before the center point in the opening of the hole could lead to corner chipping.
Never use a 90 ̊ Spot drill that will be followed by a 140 ̊ drill point!
Spot Drill Point Depth
60 ̊ 0.866 x dia = point depth
82 ̊ 0.575 x dia = point depth
90 ̊ 0.500 x dia = point depth
118 ̊ 0.300 x dia = point depth
120 ̊ 0.288 x dia = point depth
135 ̊ 0.207 x dia = point depth
Spot Drill Point Depth
Supal(changzhou)Precision Tools Co.,Ltd
- Company Name: Supal(changzhou)Precision Tools Co.,Ltd
- Representative: TianQiang Jiang
- Product/Service: Carbide End Mill , Carbide Drill Bits , Carbide Reamers , Carbide Saw Blade , Carbide Inserts , Carbide Special Tools
- Capital (Million US $): 4800000
- Year Established: 2016
- Total Annual Sales Volume (Million US $): US$10 Million - US$50 Million
- Export Percentage: 11% - 20%
- Total Annual Purchase Volume (Million US $): Below US$1 Million
- No. of Production Lines: 3
- No. of R&D Staff: 5 -10 People
- No. of QC Staff: 5 -10 People
- OEM Services Provided: yes
- Factory Size (Sq.meters): 3,000-5,000 square meters
- Factory Location: No.105 Punan Street,Xixiashu Town ,Xinbei District,Changzhou City, Jiangsu Province,China
- Contact Person: Ms. Dora
- Tel: 86-0519-83331892
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