The principle of compound indexing is to obtain the required division in two stages: (i) By rotating the crank or handle in usual way keep­ing the index plate fixed. <> 16.61. <> Generation of flutes on twist drills, milling of helical and spiral gears, milling of worms and cutter, etc. This crank can be rotated about the axis and the plunger can be fixed at any desired hole. Its primary purpose was that of indexing and rotating work in Spiral Head conjunction with the movement of the table for cutting flutes in twist drills. • Milling machines are very versatile. It helps to divide the job periphery into a number of equal divisions, i.e., square, hexagonal octagonal, etc. <>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 720 540] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> 8 0 obj INDEX CORPORA,TION MP - 1M - 10/ 75 Repr. Account Disable 12. [gravityform id="1" title="false" description="false" ajax="true"]. endobj The rotating tool consists of multiple In such cases, differential indexing is found to be more suitable. 4 0 obj endstream %PDF-1.5 endobj Report a Violation 11. <> Vertical Milling Machine is Most Common. The following relation is used for simple indexing: T = 40/N, where T gives the number of turns or parts of a turn through which the index crank must be rotated to obtain the required number of divisions (N) on the job periphery. In dividing head, the first requirement is met by an index-crank and the second by the index plate. x��[[oܶ~7�����¦EI���.�$=qЇ��b;u���*���!g(��4��(���r�}3��{�j����ً�����.��_����]~�as{_l��e��%{�� {}}zr�`)O#v���D0O�'X(y�8�x�믧'��?~==�k������NO~V�z�Zɏ��Eˆq��h�l�p�в��7�X���x,�R |;=���"�+����g��h��ӓ?b����H!�:H֪ �Cc��l�������;*��!C=T�Y洐C��N�?�ԣ܌x���J����2���pO�iC���O�#y,�m��L���P�h��4T21�"%� a��Ȱ��Ad�gi�yE"�ɓ�CW�s!W���`�p��tu��g��QPT�����7�o�w����e��8��q����Pˆ�P���n�.��~��=�W�t���Q� �������_�[�կ���U?����->���TA #���'а�0੯?��1#�|.i��D��gH`m1��Odh���R>���X�sb�ʐH����ˣ�I>m�P*��?žb�NF�q�}�#� �D�4���`��$�kQס��"W{�e��^��0�*��d��#z�c���fz� Between the indexing plate and spindle of dividing head, a certain set of the gears is incorporated extra. The accuracy of spacing of teeth is very important particularly when the work is of precision character e.g., gear teeth, shafts, cutter teeth etc. This is accomplished with the help of a milling attachment known as dividing head, which is an accessory to the milling machine. The formula given below holds good for the change gears. This is done by connecting the worm shaft to the milling table feed screw with the help of a set of gears. Metallurgy, Industries, Metals, Machining, Processes, Milling, Indexing. Dividing Head One of the more important attachments for milling machine. <> In this machine, a multipoint cutter is rotating against the workpiece and material removed from the workpiece accordingly.. 10 0 obj For example, if a 27 teeth gear is to be cut, then T = 40/27 i.e., the rotation required for one tooth spacing is 40/27 which may be written as 2/3 + 22/27 or 12/18 + 22/27. Angular indexing is used for this purpose. 9 0 obj Introduction to Machining: Milling Machine. Prohibited Content 3. �@E����[��ffv�$EAq�B,D4������`5͝s�E4C�M�q�sU��V2D�"�"B���V��ZE�E����~��&���w��k����L�4>��+&|��h`�d6#c3���шFZ�Zh��'Z ��|Ft��� As the handle is turned, the index plate also turns, but at a different rate and perhaps in the opposite direction. Most heads are based on a Bridgeport design and have been cloned by Taiwanese and Chinese manufacturers. Available number of index plates with different hole circles, sometimes confine the range of plain indexing. The index plate has 24 holes and the periphery of job can be divided into 2, 3, 4, 6, 8 and 12 equal parts directly. are some of the examples of this class. The ratio of crank and the shaft on which job is mounted is 40 : 1, i.e., when the index plate makes 40 revolutions, the job makes one revolution. Plate 1 : 24, 25, 28, 30, 34, 37, 38, 39, 41, 42 and 43. The difference of N and n causes the index plate to rotate itself in a proper direction relative to crank. 5 0 obj The mechanism known as the spiral head constituted one of the fundamental parts of the original universal milling machine. The arrangement of gears can be in the form of simple wheel train or compound wheel train or compound wheel train depending upon the suitability and requirements. <>>> %���� Before uploading and sharing your knowledge on this site, please read the following pages: 1. 3 0 obj Terms of Service 7. Since the crank and spindle ratio is 40 : 1 and hence when the crank moves through one revolution, the spindle or the job moves through 1/40 of revolution, i.e., the job will revolve through an angular movement of 9°. They are usually used to machine flat surfaces, but can also produce irregular surfaces. endstream endobj Lead of the helix depends upon the rate at which the job is rotated with respect to table movement. 6 0 obj To rotate a job through required angle, one needs: (ii) A source which can ensure that the job has been rotated through the desired angle. endobj Lead of helical milling machine is the distance through which the table moves when the spindle of dividing head moves through one revolution without any change in velocity ratio between the dividing head spindle and the table feed screw. FOREWORD Your new Wells-Index Milling Machine was designed and manufactured to conform to our high standards of machine tool performance. Content Guidelines 2. endobj 7 0 obj This can be achieved by introducing change gears. stream stream This is accomplished with the help of a milling attachment known as dividing head, which is an accessory to the milling machine. In this case, different index plates with varying number of holes are used to increase the range of indexing. are some of the examples of this class. �����K�]G�#d���x��. Huge Collection of Essays, Research Papers and Articles on Business Management shared by visitors and users like you. "bk�Di yF8��x��K���st�R0��0Q��]�)��������Ң ]��,3�=�����Y"���J��Q9Sk)�j�u����B��?zj�np�Ǡ�T��m���;���W�R�����W����V�F�ra�,S×h�G�3�;�i�����Ei������=�N Q� They can also be used to drill, bore, cut gears, and produce slots. The rotation of crank is transmitted through a gear to the job, so that the number of complete revolutions will result in certain revolutions of the job. Helical of Spiral Milling in Indexing: One of the important indexing operations to be performed on milling machine is the helical or spiral milling. If it is desired to index a job by 35 degree, then the index head movement required to perform the operation will be = (35/9) = 3(8/9) = 3 + ((8 X 3) / (9 X 3)) = 3 + (24/27), i.e., the crank must be turned three complete revolutions plus 24 holes in the 27-holes circle. endobj The di­rection in which the table is swiveled determines the hand of spiral. In this case, the dividing head has an index plate, fitted directly on the spindle. Helps in changing the angular position of the of the component in relation to the cutter One of the more important attachments for milling machine Used to divide circumference of workpiece into equally spaced divisions when milling gear teeth, squares, hexagons, and octagons Also used to rotate workpiece at predetermined ratio to table feed rate x�u�Ok1�{ ����L�[ă�-]�Az(V���v���H-����7����Y�ԛ%h>�bY�K If (n — N) is positive, the index plate will rotate in the direction in which crank is rotated and if (n — N) is negative, it will rotate in opposite direction to that of crank. So for each tooth, the worm will be rotated by 12 holes of 18 hole circle with the help of the crank and then the index plate is rotated by 22 holes of the 27 hole circle. 1 0 obj <> Meaning of Indexing 2. During the differential indexing, the index-plate is unlocked and connected to a train of gears which receive their motion from the worm gear spindle. Sometimes it is necessary to introduce change gears between the worm shaft and the table feed screw, because when the table travels a distance equal to the lead of helix, the job must have completed one revolution. The table of the milling machine must be set at an angle (equal to the helix angle) to the normal position of the table. It was bui It to conform to set of rigid specifications by Image Guidelines 4. <>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.44 841.68] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> x���w|U��q��Pq� ����b�U]T�� ""`�P���H[�JD)��@BIEi���܄���q{�7gf��ܛ��z��C�=m�ν�;s�L^ @ѵ{��9�,X����O]/]�Ԩ�����Tt�\j����*���|JJ�:��gϚ�زc��cuѢE����ŋ�����ȿ~��lٲE�g~�ᇂ�zժU���m�V0] �>�@7�x. The spindle is then rotated by rotating the handle which is keyed to the worm-shaft as shown in Fig. The operation of rotating the job through a required angle between two successive cuts is termed as indexing. In this article we will discuss about:- 1. While performing helical milling, the following points must be taken into consideration: a. %���� endobj endobj b. 4 0 obj <> stream Methods of Indexing 3. 3 0 obj Instead of rotating the job through certain division on its periphery, sometimes it may be needed to rotate the job through certain angle. One of the important indexing operations to be performed on milling machine is the helical or spiral milling.


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