Point on a Thread Tap

Point on a Thread Tap

This topic has 5 replies, 5 voices, and was last updated 8 August 2020 at 20:06 by Martin Kyte.

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8 August 2020 at 18:43 #36017
Vic
Participant
@vic
Advert

8 August 2020 at 18:43 #489689
Vic
Participant
@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!
8 August 2020 at 18:50 #489692
Howard Lewis
Participant
@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
8 August 2020 at 19:23 #489699
Andrew Tinsley
Participant
@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.
8 August 2020 at 20:01 #489709
OneManEngineering
Participant
@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
8 August 2020 at 20:06 #489710
Martin Kyte
Participant
@martinkyte99762
So you can use it as a dot punch.

regards Martin
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