Machining Design Guidelines
📌 Drilling Guidelines

✅ Standard Hole Sizes
Specify standard hole sizes as they can be created using a standard drill. Unusual hole sizes are not recommended as they require custom tools and increase the cost of manufacturing through purchasing and inventory.
Reducing variations in holes size will further reduce assembly accessories like fasteners, pin, rivets,etc.

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Machining Design Guidelines
📌 Drilling Guidelines

✅ Holes with Flat Bottoms
It is recommended to make blind holes with conical and not flat bottoms. Flat bottomed holes cause problems in subsequent operations (for example: reaming).
Also,flat bottomed holes require special tooling operations leading to increase in manufacturing cost and time.
A standard twist drill is used to create a hole with conical bottom.

/Example
In this example👆, hole size is less than 45 mm, preferred operation will be drilling. It is recommended to use conical bottom holes.

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Machining Design Guidelines
📌 Drilling Guidelines

✅Partial Holes
Avoid partial holes as there are high chances that drill will wander if a large portion of the hole is outside the material. The problem can become even more severe if the axis of hole is on or near the edge of the material. If partial hole is unavoidable, then ensure that at least 70% of hole area should be within the material.

Machining Design Guidelines
📌 Drilling Guidelines

✅ Deep Holes
Deep, small diameter holes should be avoided as they are difficult to machine. Small diameter drills tend to wander and are prone to breaking. Chip removal also becomes difficult while drilling deep holes. Therefore it is recommended that the hole diameter to depth ratio should be less than 3.

Example👆
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Zero tolerance Machining with the Wire-EDM👍

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