Broken 6-32 tap


#1

@Team_Machine_Shop

I broke the 6-32 tap in this set. Let me know what I owe to replace it.


#2

it happens. taps are very susceptible to breaking. I’ll get more on the next order round.
the questions to ask yourself are:

  1. did you use enough oil?
  2. did you use the correct drill per the chart?
  3. if it was hand tapped - what did you do to make sure it was straight as it went into the hole.

#3 is the biggest killer.

Regards,
Nick


#3

#4 - did you periodically back it out part way to clear the chips? Also a big killer.


#4

Nick - Is there a trick to keeping it straight? A jig or something? That’s always my biggest problem.

Thanks,

Phil


#5

If your part fits we have a tool on the cart to the right of the lathe that helps keep taps straight. It’s not too difficult to take a good look at and imagine how it’s supposed to work.


#6

If it fits on the drill press or Bridgeport there is a spring loaded live center to keep it straight


#7

In case it’s not clear-- secure the workpiece in a good vise such that the drill press’ axis is perpendicular to the plane at which it was drilled. Use the live center (spring-loaded pointed pin) to apply pressure to the indent in the back of the tap as you start tapping. It will keep it straight.


#8

For tapping hard material where only nominal pull out resistance is needed, the majority of situations, I found that using a drill size slightly larger than the chart greatly reduces the tapping torque, yet yields very sufficient pull out resistance. For example, #4-40 tap requires a .089 inch drill per chart but using a 3/32nds, .093 inch end mill or drill works very well for most situations - enough thread over lap, though less. This combined with all of the above rarely results in a broken tap. Faster and easier too.