Punching vs. Drilling — Holes And How We Make Them
by David Spiel
A customer calls and says that he wants to buy a three-hole punch, but I tell him that he really does not. To avoid the risk of falling into an Abbott-and-Costello routine, I explain to him that a drill uses rotating drill bits to drill through paper and a punch uses reciprocating male and female dies to push through paper. A solid punch pin pushes paper through a female hole and the waste exits below. A drill cuts the paper while spinning and the waste is ejected up through its hollow shaft and exits through the top.
What's the difference? Speed, accuracy, versatility and cost.
Let's start with speed. The most common misconception in this end of our industry is that an automatic punch is faster than a drill. It most certainly is not. In fact, the slowest three-hole drill is faster than the fastest automatic punch. The slowest three-hole drill can drill through a 2˝ lift every stroke.
How many strokes can you do in a minute? The fastest punch can only punch 7˝ of stock per minute. If you can drill four lifts of stock per minute you are already ahead of the game. A good operator can drill six or seven lifts per minute. Since many drills can drill through 2˝ or 3˝ lifts, it becomes even more apparent that drilling is faster.
The only stock that is clearly better to punch than drill is plastic and vinyl. While both can be drilled (with quick strokes and slow spindle speeds), ideally, they should be punched. Heat and friction tends to melt these stocks and causes a mess within the drill bit. If the plastic hardens within the drill bit, you might as well throw it away. Some operators prefer to punch heavily varnished stock, rather than to drill it.