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TAPS
101
TITAN =
TAPS
101
THE BASIC TYPES OF =
=
TAPS
![](3D"slide0012_image002.gif")
![](3D"slide0012_image004.gif")
![](3D"slide0012_image006.gif")
![](3D"slide0012_image008.gif")
STRAIGHT FLUTE
SPIRAL POINT
THREAD FORMING
HI SPIRAL FLUTE
![](3D"slide0012_image010.gif")
HIGH =
PERFORMANCE
(SEMI BOTTOM)
![](3D"slide0012_image012.gif")
HIGH =
PERFORMANCE
SPIRAL POINT=
PLUG
STRAIGHT FLUTE TAPS
•MOST COMMON TAP =
3;
•
•LEAST EXPENSIVE
=
;
•
•GENERAL PURPOSE
•
•STORES CHIPS IN THE FLUTES
•
•FOR THROUGH AND BLIND HOLES
![](3D"slide0013_image014.gif")
SPIRAL POINT TAP
•<=
/span>MOST ECONOMICAL TO=
USE FOR THROUGH HOLES
<=
/span>
<=
span
style=3D'font-size:88%;color:#333399;mso-color-index:5;visibility:hidden'>=
•<=
/span>
•<=
/span>HAS EXTRA GRIND ON=
=
THE POINT
<=
span
style=3D'font-size:88%;color:#333399;mso-color-index:5;visibility:hidden'>=
•<=
/span>
•<=
/span>PUSHES THE CHIPS I=
N FRONT
<=
/span>
<=
span
style=3D'font-size:88%;color:#333399;mso-color-index:5;visibility:hidden'>=
•<=
/span>
•<=
/span>FOR THOUGH HOLES <=
/span>AND DEEP DRILLED <=
/span>BLIND HOLES=
![](3D"slide0014_image016.gif")
THREAD FORMING TAP
•MAKES NO CHIPS
•TIN COATED FOR ADDED TOOL LIFE &#=
13;
•FORCES THE THREAD =
INTO SOFT MATERIAL=
•STRONGER TAP-WEAKER THREADS
=
;
•NEEDS THREE TIMES =
THE POWER
•ROOT CREASE CAN CAUSE CROSS THREADING
![](3D"slide0016_image018.gif")
It is genera=
lly
recognized that in mass production, it is possible to re-produce in exact detail, the theoretictically perfect product=
as
laid out on the drawing board. The slight variation between the theoretically perfect product an=
d each
unit of the actual product is called TOLERANCE=
.
ALLOWANCE- An intentional
difference in correlated dimension of mating parts. It is the =
minimum clearance =
or the
maximum interference between such parts.
ANGLE
OF THREAD- The angle included between a flank of the thread measured in=
an axial plane.
<=
/span>
HALF
ANGLE OF THREAD- The angle included between a flank of the thread and
the normal (90°) to the axis, measured in an axial=
plane.
LEAD OF THREAD- The distance a screw thread advances axial=
ly
in one turn. On a single-thread screw the lea=
d an
pitch are identical. On a double thread the lea=
d is
2x pitch, on a triple thread the lead is=
3x
pitch, ect.
MAJOR DIAMETER- The largest diameter of a straight thread.
=
;
MINOR DIAMETER- The smallest diameter of a straight thread.=
3;
PITCH- The distance from a
point on a screw thread to a corresponding p=
oint
on the next thread measured parallel to=
the
axis.
=
![](3D"slide0017_image020.gif")
![](3D"slide0017_image022.gif")
=
TAP SELECTION
TAPS WORK HA=
RDER
THEN OTHER TOOLS BECAUSE THEY HAVE TO FEED INTO THE WORK AT THE PITCH OF THE THREAD
ALL OTHER TOOLS CAN VARY TH=
E FEED
RATE AND THI=
CKNESS
OF THE CHIPS
TAPS ALSO HAVE A LIMIT TO T=
HEIR SIZE AND STRENGTH BECAUSE THEY H=
AVE TO
FIT INTO
THE HOLE THEY ARE TAPPING
CHOOSING THE BEST TAP HAS A BIG INFLUENCE IN THE COST =
OF
TAPPING HOLES.
HOW C=
HIPS
ARE FORMED IN A TAP
![3Dscan003](3D"slide0020_image024.gif")
Cutting Angle
Cutting Angle
Minor dia.
POSITIVE HOOK =
FOR
MATERIALS THAT MAKE LONG CHIPS
BUTTRESS FORM FOR MATERIALS THAT
MAKE SHORT CHIPS
![](3D"slide0021_image026.gif")
![](3D"slide0021_image028.gif")