Confusion Of Style Of Taps To Purchase

[ptomli]

Typically called "serial taps"

 

[Billh50]

That would be real nice for larger taps to make it easier tapping by hand. One could even make it a 4 tap set if needed.

 

[Dan_S]

Narex (makes woodworking tools as well) makes them as well.

https://www.narexzd.cz/en/hand-taps/

You can find them on eBay.
http://www.ebay.com/itm/like/171539943315?ul_noapp=true&chn=ps&lpid=82

 

[Billh50]

Narex (makes woodworking tools as well) makes them as well.

https://www.narexzd.cz/en/hand-taps/

You can find them on eBay.
http://www.ebay.com/itm/like/171539943315?ul_noapp=true&chn=ps&lpid=82

the photos of those do not look like serial taps though.

 

[Billh50]

Here's a set of serial taps and dies with handles and gage on ebay. The set has 7 different metric size taps. GBP 29.00 Approximately US $43.73

http://www.ebay.com/itm/HSS-32-PIEC...383185?hash=item1ea6519491:g:qCQAAOSwRLZUDbzr

 

[Dan_S]

the photos of those do not look like serial taps though.

not all of them on eBay are, but a lot of them are. Like these for example, they show how the thread form changes between the taps.
http://www.ebay.com/itm/NEW-BSW-1-2...563142?hash=item27f2c295c6:g:vz4AAMXQDfdRrHlf

 

[The Liberal Arts Garage]

Try one of those handy pocket tap alignment widgets-- if you get the first
two turns perfectly straight, the rest will go easy........BLJHB.

 

[John Hasler]

Try one of those handy pocket tap alignment widgets-- if you get the first
two turns perfectly straight, the rest will go easy........BLJHB.

Could you explain or post a link?

 

[atunguyd]

A tip for the OP. When (not if) you break a tap in aluminum or any other non ferrous metal and want to remove the broken tap get yourself some nitric acid. 1 minute in the acid and the tap will dissolve away but the aluminum will remain unscathed (actually cleaner).
If you can't get nitric acid then alum (pickling lime) will do the same but will take about 2 weeks.

On a side note, if for some reason you have a piece of aluminum stuck in a steel part that you need removed you can dissolve the aluminum with caustic soda which will not effect the steel.

Sent from my SM-N920C using Tapatalk

 

[turnitupper]

I have a set of three M6 taps that I bought in a regular German hardware store around 1969. I still usem them and they are still working really well. They do not have spiral points and are 4 fluted.
However, unlike any taps I've found and bought in English speaking countries, this set has a 'first cut' (my expression) or taper tap which cuts a very shallow thread over its full lenth above the relatively short taper section. The 'second cut' tap has next to no taper, and cuts the thread a bit deeper, but with visible flat bottoms of the thread for it's entire length. The 'final cut' tap has just one or two tapered threads at the end and cuts the final thread for its full length.
I have been able to cut very deep thread in pretty hard steel and stainless without any issues whatsoever. I also use them in a cordless drill to make deep threads. Of course they need backing out to break and clear swarf from blind holes.
Are those taps available in the US, UK or Australia, and what are they called in English?
Cheers,
Joe

Joe,
In Australia, Ausee Machines & Tools in Dandenong sell these type of taps. Just ordered a set of 2.5mm for a carbide insert holder I am making as HSS taps break in the mystery steel I am using. Hope these work.
John.