What causes a drilled hole to be oversized?
What causes a drilled hole to be oversized?
Oversized holes can be caused by too much lip relief, unequal lip heights and a worn drill bushing. Below are possible solutions to each of the causes. Short tool life can be caused by the fact that only one lip on the drill is cutting or drill dwelling.
How do you drill a hole bigger than a drill bit?
You can do this by following these simple steps:
- Select a tapered reamer that can fit into the hole.
- Insert the tapered reamer in the hole.
- Start twisting the tapered reamer inside the hole.
- Increment the hole size by using a larger reamer each time until you reach your desired width.
Why is it best to use the correct size of a drill bit when drilling holes on a printed circuit board?
If your drills are too small, you will not fit all your components on the board. If you use bits that are too large, you will waste solder and board area. You may also run into other problems, including stuffing. The general tip is to make your holes 0.3 millimeters (mm) wider than your component.
Why drill bit is overheated in drilling operation?
If the speed is too fast (the drill spins too quickly) the drill bit will not bite into the metal, it will just spin without cutting very much. This causes a lot of friction, which overheats the drill bit and makes it dull.
What is a drilled blind hole?
A blind hole is a hole that is reamed, drilled, or milled to a specified depth without breaking through to the other side of the workpiece. The etymology of the blind hole is that it is not possible to see through it.
Why do we need to drill holes on PCB?
High speed drilling ensures clean hole walls to provide a secure base for good plating on the hole walls. Drilling is a slow process as each hole must be drilled individually. So depending on the drill size we drill a stack of one to three PCB panels together.