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Carbide Spot Drills with Diamond Coating for Glass

$1 - /Piece/Pieces

Diameter:

1-20mm

Comprehensive length:

75mm

Types:

End Mill

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Product Description

Product Attributes
Supply Ability & Additional Information
Packaging & Delivery

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Overview

Product Attributes

Brand: OEM

Support Customization: Oem, Odm, Obm

Place Of Origin: China

Material: Carbide

Coating: Altin, Tiain, Ticn, Tin

Supply Ability & Additional Information

Packaging: 1piece in a plastic pipe ,10pieces per group and air bubble paper in a carton to reduce the shock.

Productivity: 1000000PCS

Transportation: Ocean,Land,Air,Express

Place of Origin: Changzhou,Jiangsu

Supply Ability: 10000000PCS

Certificate: ISO

HS Code: 8207709000

Port: Shanghai

Payment Type: T/T,Paypal,Western Union

Incoterm: CIF,FOB,EXW

Packaging & Delivery

Selling Units:: Piece/Pieces

Package Type:: 1piece in a plastic pipe ,10pieces per group and air bubble paper in a carton to reduce the shock.

Picture Example:

Tungsten carbode 120 degrees Solid Carbide Spotting Drill

Spot drilling prior to the full drill cycle can ensure accurate hole location by avoiding drill deflection. Spot Drilling is recommended when a drill might have a tendency to move off center and particularly recommend in deep-hole drilling. These drills are designed to be extremely rigid to precisely spot a hole for a twist drill. The primary purpose of a spot drill to make a "dimple" in the workpiece so that the twist drill does not deflect and "walk" off-center and the hole is drilled in the correct location .

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.

Using a spot drill with an angle less than the drill point angle WILL cause the drill flutes to be "blown off"
Never use a 90 ̊ Spot drill that will be followed by a 140 ̊ drill point!

Spotting Drill Jpg