|Ian P||16/01/2020 21:48:39|
2412 forum posts
The recent thread about 'driving taps' has prompted me to set out some other tap related matters that I have often wondered about. I could probably find answers to at least some of them if I used a search engine but I wondered if the things I have experienced have been seen by others.
|old mart||16/01/2020 22:05:32|
|1921 forum posts|
You've got it pretty well sussed.
A. The wrench is probably made to be correct if using the biggest tap that will fit it.
D. I've never tried them, would prefer ist, second and bottoming myself.
E. Yes that seems to be common, no idea why.
F. I've never noticed.
G. Yes, they are miniature works of art.
1387 forum posts
I would have thought that E: was due to the swarf bunging the thread a little on the way out.
|Andrew Johnston||16/01/2020 22:28:31|
5635 forum posts
A. Never really noticed that
B. If needs be I do the same, but I rarely use plug taps, taper is fine for through holes. I use spiral flute taps a lot, you only need to buy one tap, not a set
C. No idea, never used serial taps for V-threads
D. C C. Serial taps can be useful for square and Acme threads. Here's a home made set for a square thread:
E. Never noticed it, but I use commercial tapping heads on the vertical mill and repetition lathe along with spiral flute taps, so reverse just happens. Depending upon tap size I'll run at 500 to 1000rpm
F. Not noticed it with professional taps, although I'm not convinced of size of some of the ME taps I've bought
G. The relief is fairly simple, it's how they get the thread form impressed into the grinding wheel that amazes me
|372 forum posts|
Perhaps it is only here in the Netherlands but I am shocked at the prices I have to pay for small sizes taps. I returned the M1.4 mm Bergeon ones when they arrived with an invoice of 98 euro ex. VAT. Ordered the same size from another supplier for 30 euro ex. VAT, made by Ritter which used to be a good German mark, they work but at close inspection are crudely made. Niko.
|962 forum posts|
A - Not worried.
B - I usually grind off the point on plugs. The last time I broke a tap was doing this.
C - I try to buy single taps from suppliers I trust.
D - I have tapped stainless steel without difficulty. I realise there are many different stainless steels but, I am told, you must cut and not rub. If you want real difficulties try Aluminium Bronze.
E - With mild steel, yes. I do not tap using power and consider 3/8" BSF very large!
F - I have not met this one - see C
G - That is what you pay for.
18659 forum posts
A. Get a smaller wrench.
B. Yep grind the points off and not just the plug
C. You can get individual ones from Name brand suppliers but one will cost more than a set of three unbranded
D. No never found a benifit from the few that I have
F. Probably less noticable when hand tapping
G. I would not want to make ones that small.
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