The document discusses various types of sewing machine needles: [1] Spiral groove needles have a groove that extends spirally down the needle to prevent chafing of the thread when passing through dense fabrics. [2] Self-threading needles have a slit that allows the thread to slide directly into the eye of the needle. [3] Twin and triple needles are attached to a single shank with a crossbar, allowing evenly spaced parallel rows of stitching. Multiple thread spools are required to thread each needle separately.

1. 2.While stitching what is the maximum temp.which the needle achieves?
With Coolers
Maxm – 176c (at 4000 stitches per min)
Without Coolers
Maxm – 273c(at 4000 stitches per minute)
3.How many times the thread passes through the needle thread before it get stitched?
Twice.
5. WHAT ARE THE CONVENTIONAL NEEDLE POINTS MANUFACTURED BY THE NEEDLE
MANUFACTURING COMPANIES? GIVE THE LIST OF THE NEEDLE TYPES MANUFACTURED BY
GROZ & BECKERT.
Needle Points
Needles are manufactured with a wide variety of needle points appropriate for the different
properties of materials which have to be sewn. The needle point can be located wither centrally
or eccentrically. There are two basic classes of points:
Round points
Cutting points
Slim Set Point Needles – can be penetrate the yarns of the material being sewn through its sharp
point and is ideal for all woven fabrics because it helps to produce an even stitch and causes a
minimum of fabric puckering. They are used for Blind stitches and for fine, densely woven
fabrics. These points are not suitable for knitted fabrics.
Set Cloth Point – needles are slightly rounded to displace yarns of the material being sewn
without damaging them. This is most commonly used point.
Heavy Set Point – needles are strongly blunted. These are used for button sewing machines.
Ball Points – Light Ball Point is used for sensitive fabrics such as knits, to prevent damage to the
loops. This is crucial for maintaining the fabric’s elasticity. Medium ball point and heavy ball

2. point are used for fabrics containing stretchable yarns. While sewing the threads are displaced
not pierced. The needle pushes between the fabric yarns rather than “cutting rough” the yards.
Cutting Points – are used for sewing leather, coated or laminated fabrics. These are classified
and named according to the position of the cutting edge and its shape. The shapes are named
with regard to the form of the cutting edge for example spear point, triangular point, diamond
point etc. The shape of this needle will create a slit (rather than a large hole) through which the
thread will pass.
Needles manufactured by Groz Beckert as per the needle point types
The GB - Point Styles / Tipo De Puntas GB
Description / Descripción Application/ Aplicación Designation / Symbol /
denominación Simbolo
Regula Universal application for LOCKSTITCH (FST 301)
r and woven cloth
round Aplicación universal para puntada de dos hilos y ropa R
point tejida
Punta redonda normal

3. Sharp Standard for BLINDSTITCH. Also for very straight
round stitchlines (susceptible to damage)
point Tipo normal para ciega. También para lineas de RS
Punta puntadas muy rectas
redonda aguda
Round Recommended application for CHAINSTITCH (FST
point 401) knitted fabrics and button sewing
with Aplicación recomendada para punto de cadeneta Tejidos
RG
slightl de punta y para coser botones
y rounded tip
Punta ligeramente redonda
Light For all kind of knitted and synthetic fabrics
ball Para toda clase de tejidos y fabricados sintéticos
point FFG
Punta
de bola fina
Mediu For highly elasticated material with rubber or
m ball elastomeric content
point Para materiales muy elásticos con goma o contenido de
FG
Punta elastómeros
de bola
fina
Heavy For coarser materials of high elasticity. Also for
ball open-structured fabrics
point Para materiales bastos y alta elasticidad. También para
G
Punta fabricados de estructura abierta
de bola
pesada
Specia Knitted and woven fabrics with high content of
l ball elastomerics (Licra, Dorlastan, etc.)
point Fabricados de punto y tejidos con alto contenido de
SKL
Punta elastómeros (Lycra, Dorlastan, etc.)
de bola
especial para LYCRA
Round For plastic foils, laminates and leather clothing
point cutting edge at the tip
with a Para hojas de plastico, laminados y vestidos de piel/td>
small SD
triangular cutting edge at
tip
Punta de bola pesada
Narrow Wedge (NW) point For dense stitch formation in leather. Edge and
Punta de cuña estrecha cup seams on uppers
P
Para secuencias de puntadas densas en piel. Borde y
costuras en la parte superior
Narrow Cross (NCR) point For long stitches deeply set and very straight
Punta de cruz estrecha stitchlines in leather
S
Para puntadas largas y profundas. Lineas de puntadas
muy rectas en piel
Diamond (DIA) point For straight stitchlines in hard and dense leathers
Punta de diamante and for bag seams
DI
Para lineas de puntadas muy rectas en piel dura y
densa. También para costura de bolsos
Narrow reverse twist For slanted stitch appearance in leathers and
(NRTW/RTW) point ornamental seams
LR
Punta estrecha torcida al reves Para puntadas de apariencia oblicua en piel. Costuras
(NRTW/RTW) (45°) ornamentales
Narrow reverse twist Application similar to LR, but slightly stronger
(NRTWSP/RTWSP) cutting effect
Punta estrecha torcida al reves Aplicación similar a LR, pero con el efecto cortante VR
por encima de 45° ligeramente más fuerte
(NRTWSP/RTWSP)
Narrow twist (NTW/TW) Stitch appearance almost straight. For regular
Punta estrecha torcida joining seams in leather LL
(NTW/TW) (225°) Puntada de apariencia casi recta. Para costuras de unión

4. regular en piel
Triangular (TRI) point Stitch appearance almost straight. For hard and
Punta triangular (TRI) dense leathers
D
Puntada de apariencia casi recta. Para pieles duras y
densas
Reverse triangular (RTRI) For twin needle machines (left needle) to match
point the seam of the right needle (D)
DU
Punta triangular inversa (RTRI) Para máquinas de dos agujas (aguja izquierda) para
aparejar la costura de la aguja derecha
Square (RSQ) point For heavy, hard and homogeneous materials. Bag
Punta cuadrada inversa (RSQ) seams
Q
Para materiales pesados, duros y homogeneos. Costura
de bolsos
Reverse square (RSQ) point Application similar to Q
PPunta cuadrada inversa (RSQ) Aplicación similar a Q QR
Flattened round (STAY) Application similar to Q. Also for buttonholes in
point leather clothin
STAY
Punta redonda aplanada (STAY) Aplicación similar a Q. También para ojales en vestidos
de piel
6.How does the needle face on the puckering and what prevention measure one should take.How to
improve it?
The puckering caused by the needle is called Displacement puckering.
Reason
Displacement of individual warp and/or weft threads by needle penetration and sewing thread.
The extent of the displacement depends on the density of the fabric and the way it is woven, as well as
on the needle thickness and thread thickness. Very fine and specially treated(easy care) fabrics permit
only very limited lateral displacement of the fabric.
The risk of displacement puker arises particularly at high sewing speeds. This problem is very typical
because of todays finely woven microfiber fabrics. The structure of plain woven fabrics means that these
are more likely to be affected by displacement pucker than satin woven or twill woven fabrics.
Prevention
Maintain the correct tension of the thread.
Maintain the correct tension of the bobbin case thread.
Use the correct thread type
Use the correct feed dog according to stitch and fabric

5. How to Improve.
Use the finest possible needle for a given thread size.
Wherever possible two-thread chainstitch (stitch type 401) should be used. This is because this type of
stitching, with a loop of thread on the underside of the fabric causes less displacement of the warp and
weft threads .
7.Where do we use reinforce needle blade?
These needle are designed for use in high speed sewing machines. The shoulder is often extended into
the upper part of the blade to give a thicker cross section which just enters the material when the
needle is at its lowest point on each stich. This reinforced blade strengthens the needle and also
enlarges the hole in the material when the needle is at its lowest point , thus reducing friction between
it and the material during withdrawl after each stich .
The needle with reinforced blade and pronounced needle scarf are special designed to skip stitching
result from wrong loop formation, needle shaking and thread breakage..
8. Why we do coating?
The final feature of a sewing machine needle which can vary is the surface finish which is given it.
needles are made from steel and in the final stages of manufacture they are polished , especially in the
area of the eye. In many cases they are electroplated to given corrosion resistance, resistance to

6. mechanical were reduction of friction during sewing and a good overall appearance. The materials used
for plating are chromium or nickel. One requirement of the surface finish of the needles is that they
should not easily pick up any particles of synthetic fabric or synthetic sewing thred which they may have
caused to melt as a result of excessive friction-generated hear.it has been found that chromium-plated
needles resist the adherence of melted synthetic residues rather better then nickel-plated needles do,
despite the fact that chromium-plated needles actually develop higher temperatures during sewing than
do non-plated or nickel-plated needles.
9.Short Note on needel, parts, functions, variation………
Part 1
Part 2

7. Part 3

8. Part 4

9. Part t 5
10.Where do we use tapered needle?
On tapered blade needles, top of blade at shoulder is larger in thickness than at eye.blade tapers
gradually to eye position, which is the diameter indicated by the needle size number. A tapered blade
serves to strenghthen the needle blade, although in doing so, nearly the entire blade length is subjected
to friction when penetrating the material.
It is only made in small sizes(5 – 11).The taper permits a smaller initial perforation in fine materials yet
maintains blade strength in the curved portion of the blade.
Question:11 How do we identify the size of the needle ?

10. Answer: The needle size can be as small as 60(.6mm) or as large as 250(2.5mm). needle size is related to
the diameter at a point at the middle of the blade above the scarf or short groove but below
any reinforced part. The metric system size (Nm) describes the diameter of the needle blade in
hundredths of mm.
Example of diameter-
In mm Nm
.65*100=65
.90*100=90
1.10*100=110
1.30*100=130
2.50*100=250
Question- 12. What care you will take while placing the order of the
needle?
Answer-
Sewing machine needles should be chosen according to the weight and texture of
the fabric to be sewn.
While placing the order, I will take care of these points.
1) The most readily available machine needles are sized from 9 to 18 - the smaller the
number, the smaller the needle. This remains true, even if the needles we purchase use
a different numbering system.
2) We should Use standard sharp sewing machine needles in sizes 11 to 14 for most
sewing projects. A smaller-sized needle is best for sheer or lightweight fabrics. Sizes 16
to 18 are used for heavyweight fabrics like denim.
3) We should Use ball-point machine needles to sew knits or other stretchy fabrics. Their
blunt edges allow the thread to pass between the fabric's fibers rather than through
them. This is crucial for maintaining the fabric's elasticity.
4) We should Use wedge-point machine needles to sew leathers, suedes and vinyls. The
shape of this needle will create a slit (rather than a large hole) through which the thread

11. will pass.
5) if I am unsure which is appropriate for our fabric. I will Purchase a package of assorted
needle sizes.
6) I will Test the various sizes on some scrap fabric until I determine the correct size to use.
7) I will Check the label on the needle package before I make a purchase. For most brands,
there will be a sizing guide that will tell us which fabrics can be sewn with the enclosed
needles.
8) I will Refer to my sewing machine manual to determine which needles are compatible
with my machine model.
9) I will Write down the make and model of my sewing machine and take this information
with me when I purchase needles. That way I'll be able to check for needle compatibility.
10) Both ball-point and wedge-point needles are sized in the same manner as the standard
variety - the higher the size number, the larger the needle.
11) We should Use sewing machine needles for most sergers and Check our serger manual,
however, to make sure that a special needle is not required.
14.Write down the needle type of the following m/c
NEEDLE TYPE USED FOR FOLLOWING M/C-
1)single needle lockstitch-DB*1,DP*5
2)five thread needle flat lock m/c-4*128
3)button holing m/c- 501/180 7D
4)button attaching m/c- DPX5 11-14#
5)Batek m/c- DPX5 11#-14#
6)eyelet m/c-

12. 7)blindstitch m/c-LW*6T
8)four thread overlock m/c-DC*1,DC*27
9)five thread overlock m/c-
10)feed of the arm m/c-TV*1,TV*5
11)single needle chain stitch m/c-
12)edge cutter chain stitch m/c-
13)double needle lockstitch m/c-DB*1,DP*5
14)kansai special belt attaching m/c-
15) kansai special placket attaching m/c-44113G5
16) kansai special elastic attaching m/c-
17)pocket facing attaching m/c-
18)belt loop attaching m/c-
15. why do we use spiral groove needles?
ans. Lockstitch needles are usually made without a short groove. the function where such a
groove is provided is much the same as that of long groove, that is to provide protection for
the needle-thread as it passes through the fabric.

13. But in case of dense or resistant materials being stitched it is sometimes advisable to use a
needle in which the grooveis longer than usual and is extended spirally downward to the
point so that the needle-thread will not be chafed as it is drawn through the eye whilst the
is still passing through the material on the upward stroke of needle.These needles are
called as Spiral Groove Needles.
16. DEVELPMENTS IN NEEDLES
1. SELF-THREADING NEEDLES
Handicap or Self-Threading Needles are needles that have an ever-so-slight slit in the side of
the needle at the eye of the needle. Sliding the thread against the side of the needle, allows the
thread to slide into the eye of the needle.
Self-threading needles are not available in all types of points and are only available in sizes
80/12 and 90/14

14. 2. TWIN AND TRIPLE NEEDLES
Twin and triple needles are attached to a single shank by way of a crossbar. These needles are
perfect for evenly spaced rows of stitching.
To use these needles your machine should have zigzag capability and a throat plate that has a
hole wide enough for the needle. You can NOT zigzag with the multiple needle in the machine.
More than one thread spool holder is required so that each needle has its own thread source.
The threads usually follow the original threading pattern, as one thread and then are threaded
into each needle. Your sewing machine manual is the best resource for operating your sewing
machine with multiple sewing machine needles.
The numbers on the packages for these needles is slightly different than regular sewing
machine needles. The first number is the space or distance between the needles. The second
number is the needle size.
Triple needles are labeled Drilling Needles
3. STRETCH NEEDLES
A stretch needle is the last-resort needle when ballpoint needles still leave skipped stitches.
Many people will not attempt sewing Lycra and swimwear without a stretch needle.
Sizes Available: 11/75 and 90/14

15. Answer of Question 1,Question4,Question 13,some of Question 14. Are not there.
Please don’t give these answers or share to the following students, who have not mailed their
answers till now. Already too much time have been given to them.Plzzz follow it…
Pragya Deep
Nitish Goswami
Anurag Ranjan
Amber Mani

16. Divya Gaba
Kunal Kashyap
Shristi Gupta
Sumit Kumar
Satyajeet Sundi.
Sweta Manjri