31 replies to this topic

[nicklouse]

Gas,

 

thought I would add some pictures and info.

what I started out with some time back in the 80s

Then I bought some sets to do what I needed.

If you look carefully you can see rings on the taps.

these identify the use. First/second/last

 

finally 

two M14 taps with one ring.

but one is for use in a machine and cuts to a different spec to the one ring hand tap.

the temp sender would not go into the hole I cut with the longer of the two. But would after running the hand one through.

 

someone on here will be able to explain the difference I don’t have the info.

 

[stoneface]

If you want more info have a read here. https://www.mscdirec...m/basicsof/taps

Like you can have tolerances for limits and fits for shafts/holes you can have the same for taps, where depending on the thread class you can make them tighter or looser.

You can also use a different class of tap to cut a thread slightly over size to allow for the addition of plating.

There's more to it than many think when selecting taps and dies for precision engineering.