Benchwork and Layout part 1

Summary

The video script details a step-by-step process for marking and drilling a print on a granite plate. It emphasizes the importance of precision and cleanliness, avoiding contamination with substances like daikon. The tutorial demonstrates using two types of pipe gauges for accurate measurements and setting dimensions. It also shows how to mark lines at specific heights using a digital gauge and a precision square. The process includes center punching the marked areas for drilling, ensuring the accuracy of the drill press setup. The final steps involve drilling the holes and preparing them for reaming and tapping.

Takeaways

• 🔨 The process begins with marking three drilling points on a print using daikon, ensuring not to contaminate the precision-ground granite plate.
• 📏 Two types of pipe gauges are used: one with a dial and one with a digital display, each requiring different methods to set to zero and ensure accuracy.
• 📐 The script describes setting up dimensions on the gauges for measurements of 0.5 inches, 1 inch, 1.5 inches, and 2.25 inches from the bottom and side of the block.
• 🔩 The setup involves loosening set screws, adjusting the gauges to the desired measurements, and then tightening the set screws to secure the measurements.
• ✏️ A precision square is used to support and mark thin parts, with the objective of creating a line at each marked dimension.
• 🔧 The script details the process of turning the block 90 degrees to work on the right-hand side, using a different gauge to set the dimensions.
• 🔩 The gauge settings are adjusted to match the required measurements, with a focus on the precision of the adjustments.
• 🔨 Center punching is performed to mark the exact spots for drilling, starting with a small punch and hammer, and then using a larger punch for deeper marks.
• 🔩 The center punch marks need to be precise, with adjustments made to ensure they are centered along the marked lines.
• 🛠️ The final steps involve setting up the drill press, using a center drill, and drilling the marked spots, followed by reaming and tapping the holes as required.

Q & A

What is the purpose of using daikon in the process described in the script?

Daikon is used as a marking tool to mark the spots for drilling on the print, but it is important not to get it on the granite plate as it could dirty the precision-ground surface.

Why is it important to keep the granite plate clean during the marking process?

The granite plate is precision ground flat, and any contaminants like daikon could affect its accuracy, so it's best to avoid getting it dirty.

What are the two types of pipe gauges mentioned in the script, and how are they used?

There are two types of pipe gauges mentioned: one with a dial and one with a digital display. They are used to measure and set the dimensions for drilling by adjusting to the desired depth and zeroing the gauge before marking.

How does one ensure the gauge is set to zero before marking the print?

For the digital gauge, one moves the handle until it stops, then presses two buttons to ensure it's at zero. For the dial gauge, one moves the hand wheel down until it touches the bottom and then hits the reset button to zero.

What are the three different dimensions marked on the print from the bottom?

The three dimensions marked on the print from the bottom are half an inch up, one inch up, and one and a half inches up.

How is the first dimension set on the gauge?

The first dimension is set by loosening the set screw, moving the gauge to the half-inch mark, tightening the set screw, and using fine adjustments to ensure it's exactly at 0.5 inches.

What is the purpose of using a precision square when marking a thin part?

A precision square is used to back up and support a thin part when marking to ensure accuracy and stability during the marking process.

Why is it important to scratch a line rather than cut deeply when marking the print?

Scratching a line is sufficient to mark the drilling spot without damaging the part, and it provides a guide for the drill to follow without needing to cut deeply.

How are the dimensions set for the right-hand side of the print?

The dimensions for the right-hand side are set using a different gauge with a finger lever. The gauge is adjusted to the desired depth (three-quarters of an inch, one inch, one and a half inches, and two and a quarter inches) and then locked into place before marking.

What is the purpose of center punching the marked areas?

Center punching is done to create a small indentation at the exact center of the marked spot, which helps guide the drill bit to start drilling in the correct position.

Why is it necessary to adjust the center punch position after the initial tap?

Adjusting the center punch position after the initial tap ensures that the punch mark is exactly at the center of the marked line, providing an accurate starting point for drilling.