Do I always need a spot drill before a solid carbide drill?
No. Some drills are designed for self-starting. Follow the instructions for the specific drill and assess the workpiece surface and setup before adding a spotting operation.
How should the spot angle relate to the following drill?
Compare both point geometries and follow the following drill manufacturer's recommendation. A narrower spot can cause the outer edges to contact first; confirm the drilling sequence for your tools and process.
Is a spotting drill the same as a centre drill?
The terms sometimes appear together, but a conventional centre drill and a spotting drill can have different geometries and intended tasks. Compare the drawing and required operation before substituting one for the other.
Does the tool diameter equal the finished spot diameter?
Not necessarily. The spot produced depends on the point geometry and the depth used. Check the required feature against the process drawing and trial setup.
Can a spot drill correct every irregular workpiece surface?
No. A steeply inclined or highly irregular surface may need a different preparation method. Review the surface and intended drill with the process owner before choosing the sequence.
What should accompany a mixed-model quotation request?
List each full DP code and quantity, the destination and any packaging or inspection-document requirements. For an application review, include the workpiece and the following drill's geometry.