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TAPS: Technical information:
STRAIGHT FLUTE TAPS: Our taps can be used for both machine or hand tapping. They are most economical for use on production runs. Best used on material that produce chips or where swarf breaks readily.
Hand (or machine) taps can be supplied in sets of 3 pieces: TAPER, SECOND & BOTTOM leads
TAPER (T) TAPS: have a chamfer (lead) of 6 to 8 threads, the angle of the lead being around 4-5 degrees per side. The taper lead distributes the cutting force over a large area AND the taper-shape at the end of the thread helps the thread to start. They can therefore be used to start a thread prior to use of the Second or Bottom leads or used for ‘through’ holes
SECOND (S) TAPS: have a chamfer (lead) of 3 to 6 threads, the angle of the lead being around 8 degrees per side. They are most popular and can be used for ‘through’ holes or even ‘blind’ holes where the thread does not need to go right to the bottom of the hole
BOTTOM (B) TAPS: have a chamfer (lead) of 1.1/2 to 2.1/2 threads, the angle of the lead being around 18 degrees per side. They are used to produce threads close to the bottom of ‘blind’ holes
Notes: The name PLUG is commonly used to indicate a Bottom tap. - However, in America it is used to indicate a Second tap. - To avoid confusion the terminology that should correctly be used, as stated by British Standard 949, 1979 is: BOTTOM tap or BOTTOMING tap
Also a variation is that SECOND taps are sometimes called ‘intermediate’ and TAPER taps called ‘first’
MINIMISE TAPPING PROBLEMS & TROUBLE-SHOOTING:
- To minimise problems during tapping follow these rules:-
. Use the correct tap for the job
. Use the correct tapping drill
. Keep taps sharp - do not use blunt taps
. Choose correct speeds and feeds
. Ensure accurate alignment
. Never let a tap hit the bottom of a blind hole
. Choose correct lubricant
. Use a pitch controlled tapping attachment
- Listed below are common problems customers may find with probable causes:
Poor Thread Finish:
Chips/swarf not being cleared properly
Misalignment of tap & wrok piece
Incorrect feed rate
Tapping device or machine faulty
Insufficient or incorrect lubricant
Blunt tap or incorrectly ground tap
Excessive Tap Wear:
Blunt tap or incorrectly sharpened tap
Wrong tap selection
Taps Breaking:
Tap hits the bottom of the hole
Incorrect tapping Drill
Tapping speed too high
Hole work hardened
Blunt tap or incorrectly sharpened tap
Insufficient chip or swarf removal
Incorrect or insufficient lubricant
Machine or tapping device faulty
Wrong tap selection
Tap Teeth Chipping:
Tap hits bottom of hole
Blunt tap or incorrectly sharpened tap
Machine or tapping device faulty
Oversize / Bell Mouthed:
Incorrect feed rate
Misalignment
Incorrect tapping drill
Tapping device or machine faulty
Insufficient or incorrect lubricant
Incorrectly ground or eccentric tap
Wrong tap selection
Cold Welding:
Wrong material composition
Blunt or incorrectly sharpened tap
Insufficient or incorrect lubricant
Tapping speed too high
Hole work hardened
- On our website there is a lot of other very useful ‘Technical’ Data & Information for you to view
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PRINT any Technical Data page you are viewing - [To help you do this, go to: File menu (click on it), click on Page Setup (in dropdown menu) - set Margins at 6mm for Left, Top, Right, Bottom - click OK. -Go back to: File menu (click on it)- click on Print - type Number of Copies required - click on Print. It will now print the information
©=copyright - ‘Technical Data’ shown in our site can be freely used. This information must NOT
be reproduced or published in any article or website, without the written permission of:
The Tap & Die Co, London
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