What is a good practice when drilling stainless steel sheet material compared to aluminum alloy sheet?

When drilling stainless steel sheet material, the practice of drilling at a lower speed with more pressure is important due to the characteristics of stainless steel. Unlike aluminum alloy, which is softer and can be drilled efficiently at higher speeds, stainless steel has higher tensile strength and a tendency to work-harden.

Drilling at a lower speed helps to minimize the risk of overheating the material and the drill bit, which is crucial for maintaining the integrity of both the tool and the workpiece. The additional pressure while drilling allows for effective cutting through the tougher material, ensuring that the drill bit can engage the steel properly and overcome its resistance. This approach helps achieve clean holes without excessive burr formation.

The other options focus on practices that are not optimal for stainless steel. For instance, increasing the speed may lead to rapid wear of the drill bit and potential burning of the stainless steel. Using less pressure could result in the drill bit slipping or failing to penetrate the material effectively. Selecting a smaller drill bit might not be suitable unless it is necessary for the specific application, as it may also lack the necessary rigidity to drill through tougher materials effectively.