Point on a Thread Tap

[VicParticipant @vic]

[VicParticipant @vic]

I realise it’s there to aid manufacturing but why do some manufacturers leave the point on whilst others grind it off? Just wondering!

[Howard LewisParticipant @howardlewis46836]

Cost of removal?

Aid to holding for sharpening?

Not long ago, I need to tap some 5 x 0.5 mm holes, only 3.5 mm deep, so the tap was ground to a flat end. Fortunately, it worked O K despite having no lead in chamfer.

Howard

[Andrew TinsleyParticipant @andrewtinsley63637]

Depending on size of tap either a centre hole or a point is left by the manufacturer. They are there so that the tap can be accurately aligned on a tool and cutter grinder for resharpening.

Andrew.

[OneManEngineeringParticipant @onemanengineering]

Generally speaking the smaller sizes have point tip so you need something like a cone to aid aligning.

the bigger ones have hole so you can use a tap follower.

answer is simple: there is no room to centre drill the little ones.

Greg

[Martin KyteParticipant @martinkyte99762]

So you can use it as a dot punch.

regards Martin

[Author]

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