drill bit design pdf

Nitro-Carb Mech Length Drill Bit Set - Pouch PD-12 IBS Type 187 Spotweld PD-23 Left Hand Drill Bit PD-16 Letter PD-11 Number PD-11 Quick Release Drill Bit & … Neutral Point 3. Drill Bits, Nitro-Carb 7 Pc. 0000002628 00000 n “s” sTeel body Steel body drill bit designs are typically used in applications where open-faced hydraulics and aggressive cutting structures are required. The Fixture mostly are installed manually and have their operation in manual form only. 0000008723 00000 n 0000017715 00000 n Masonry Bits. �純<9�/ Final reports indicated drilling mechanics issues faced by other manufacturer’s bits were related to the bit design … Drag bits are offered in Chevron and Step types, with 3 or 4 wings and in sizes from 1 7/8" to 26". 0000014291 00000 n 0000105998 00000 n The step drill bit gets its name because of the design. 0000002038 00000 n The company says that the drill bit platform combines advanced bit body geometry and a cutter layout with enhanced hydraulic design and the latest generation of PDC cutter technology, to maximize drilling efficiency. The resultant force defines a plane of thrust for the cutter. 0000104787 00000 n Determination of drill collar and or HWDP length 4. The drill rate that can be achieved with a specific bit is de-termined by the aggressiveness of its design, the weight on bit (WOB) applied, the rotations per minute (RPM) and the rock strength. The force F creating the penetration depth h can be a linear combination of the force acting against the tooth flat and the force on the sloping side [8]. The most convenient method for selecting proper jet sizes for bit hydraulics optimization is the graphical approach shown in below Figure. 0000098499 00000 n A comprehensive drill bit and tap size chart lists metric and imperial sized drill bits alongside the … Drill bits. PDC bits drill primarily by shearing. the bit Drill string design Design means determination of length, weight, grades of drill pipe to be used during drilling, coring or any other operation Depends on: hole depth, hole size, mud weight, safety factor and/or margin of pull, length and weight of DCs, drill pipe An open bearing system offers the advantage of allowing higher differential pressures across the drill bit over a traditional sealed bearing arrangement. 0000103822 00000 n 23 Printable Tap Drill Charts [PDF] A drill and tap chart is what specifies the right size of drill bit that one can use to create the correct sized opening that would complement tap dimensions. Selection of drill collar diameter 2. Selection of BHA connections 3. 118° bits are used for soft materials such as wood. Our Design at the Customer Interface (DatCI℠) service network, allows us to deliver our region-specific optimized drill bits to a variety of unique operating environments. 0000010633 00000 n The thrust bearings support the downward force resulting from the weight on the drill bit (WOB) and the loads from the combined hydrostatic them. DRILL BIT TECHNOLOGY of fresh hydration, which adds to bit life. The Kymera drill bit drilled 1597.8 feet (487 m) at an average ROP of 69.01 feet per hour (21.3 m per hour) which is 18 feet per hour (5.48 m per hour) faster than the best TCI in the field. Drill Bit Speed. Nitro-Carb Mech Length Drill Bit Set - Pouch PD-12 12 Pc. Each CAD and any associated text, image or data is in no way sponsored by or affiliated with any company, organization or real-world item, product, or good it may purport to portray. 10 Design Factors C. Tooth Angle and Shape The drill bit can have slander and long teeth or short and stubby teeth. In general, there are 3 categories of common imperial drill sizes: fractional (in 1/64" increments), lettered (A-Z), and numbered (1-80). This subject is treated in two parts. IBitS software can be used to rapidly design a drill bit in 3D. Diamond Drill Bit and PDC Bit Connection.....17 Nozzle Total Flow Area ... in the following disciplines — bit design concepts, PDC cutter development and hydraulic performance optimization — as they relate to specific applications and/or drilling challenges. Standard Drill Bit Sizes Pdf. 0000023767 00000 n Drill Nomenclature-Points• Elements of Drill Points • Lip Relief Angle – Varies with the diameter of the drill and hardness of the material – On larger diameters and drills for harder materials, lip relief is decreased to as low as 8° – Drills for soft materials and small diameters have high relief angles up to 24° – Lip relief angles are measured across the margin jp)Nm��F��3BY|l�J��(�B0���c5բ���j��fHo&�w�)�2xp�����ee��?�H�m�L�>��������W��׾j\���\u!UWO��6��0�A�q�K��� ���JN�Z��=-4nZ�oI� ƼDp~1 ���EULRQ�r����tC�x�y')�7)1`F�p�b�}��E�u}Ql�L�-1��_k�b%��7O���v����Ł�FK��[�Yԃ��>?�x���������k��a絻�5��{P��s"|¿I�!GP�K^���;�/ ����5D�z���J���o�m|roUܒWrT�d\�h��)�3��]y�}G��m��b����)l�@�7��i���. The drill-string consists of: 1. Drill bits are cutting tools used to remove material to create holes, almost always of circular cross-section. 0000103365 00000 n 0000020927 00000 n M. Vaněček, in Encyclopedia of Geology, 2005. 0000027414 00000 n You can also use this type of bit to deburr holes, clearing away waste material. Some general rules of thumb are to not use a bit exactly the size of the hole … In this thesis, a new design for rotary cone bits, with the objective of improving overall drilling performance, is presented. In some applications, PDC bits will drill 3-4 times the footage of a conventional roller bit at 2-3 times the drill rate if sticky formations do not pose problems. The long teeth are design to drill soft formations with low compressive strength where the rock more yielding and easily penetrated. Nitro-Carb Mech Length Drill Bit Set - Hard Case PD-12 16 Pc. Drill Nomenclature-Points• Elements of Drill Points • Lip Relief Angle – Varies with the diameter of the drill and hardness of the material – On larger diameters and drills for harder materials, lip relief is decreased to as low as 8° – Drills for soft materials and small diameters have high relief angles up to 24° – Lip relief angles are measured across the margin Typical nozzle pattern is one nozzle per blade. The drill bit design includes an engineered gauge pad with a stripe that manages side cutting response using lateral depth-of-cut (DOC) control. When you are drilling this deep, you must adjust your speeds and feeds accordingly. Design Non-cutting end that is held by a machine tool accessory to drive or hold the drill bit. h�bbd```b``� ���@$C�d> h�b``f``b`e`��� Ā 1v� �z��]_>���(q4��+Qq(8�Ĝwuc��( ��_"N-,lV�����^�z~�+C�E&'�/��:�������ƋFE�v1����q ���lll��� J�ii �"��a`XX���f`pq �h@v&3�������,"� �( ����x`�K�6�J���|��3عy��0�7�9p;���aZ���ac#��N�V0F����`��p�����.��9��J~|� 3. 655 0 obj <> endobj 0000097671 00000 n Drill bits vary in their design and construction so that different materials can be drilled efficiently. 0000011044 00000 n • HWDP connections are far less prone to fatigue failures than drill collar • connections (see Appendix 1). 0000204579 00000 n 0000001356 00000 n 0000010893 00000 n g7��m��ə|�_�i���Am���z��m�r6'68|�_�3m�b}�\�5��Ծ����벂G�. • HWDP’s have less contact area than drill collars and therefore have a smaller • risk on getting stuck. The lower impact toughness of matrix limits some matrix-bit … 0000103917 00000 n Vertical penetrating force from applied drill collar weight and horizontal force from the rotary table are transmitted into the cutters (Fig. Design of matrix and steel-body bits. All bits are available with a number of custom manufacturing options and any thread connection, to fi t a wide range of drilling requirements. 0 The ADE service specialists can collaborate in a customer’s office or at the rig site. You can add larger bits – 5/16 inch, 3/8 inch, 7/16 inch and 1/2 inch bits if you need them. Be sure to consider the characteristics of the product. 0000101976 00000 n Drill pipes The design process shall address the following items: 1. Use center punch on all holes to prevent drill from wandering. The maximum possible flow rate is based on pump horsepower and pressure limitations. The cutting edges of the drill bit are at one end, and the shank is at the other. When the RPM or WOB are increased, the rate of penetration (ROP) should increase proportionate-ly. › Step 3: Pro-Engineer CAD Pro-Engineer CAD design system, custom developed for drill bit body design, is used to design a complete bit 3D model incorporating the SPOT cutting structure. The Computer-Aided Design ("CAD") files and all associated content posted to this website are created, uploaded, managed and owned by third party users. 0000003356 00000 n — The Basic Operation of the fixture is to Hold, Support and easy to locate the component which is going to be machined. the drill bits from 158,7mm in diameter and over and the additional return valve is installed in the drill bits from 200 mm in diameter and over. ��f��#�Oҽ���JXDq�tS�g'�Om���-x�8����à.r�Pt�{�ɰLpݼت-��{�m9��v�I�2�o�� x1w�ԩ���{ُ��*�j�ƏA�+)�����X����� �����[���G|��^5p���z}rN\���`��\u���� ��-�v�8Ɩ����vDյ�@�M.0h�]%p�7- �.p"G� Improve drilling economics with exceptional drill bit solutions ... and design custom solutions. DRILL BIT MODELING As mentioned above, when we model the interaction between the bit and rock, the indentation model of a single tooth is the entry for ROP modeling. To improve the hydraulics, the fluid flow pattern across the drill bit should be optimized for low pressure droplow, recirculation flow and high velocity. Buckling 4. The Sandvik experience includes service and support during and after the sale. As tough as these bits are made, you … 9��R��G5H��|����'��2T���ı��r[�=���|�����=켵�E4�^O�Y-"a� �٤�V;�B�Ʉ��rg\�W�8O�8���]�I��K�s*���k_��s1#��e>O��~9㠫��N��Iy#E��w�t��Ý'�o�kgTp����6Y��v&0�)4�a�!�Դd"�[{=ւ/���U�Ve̙��Y~��.��d#��8�Je�[��bj�'zu�����r����Q ��+��&\s�f�#��X��� �S�UQ[�mvx��x��A���_��vOg W `����3?Mps��#D�p]�|1�LQ�;�����CA������2��� In addition, the firm’s specially designed, high-velocity, tilted nozzles were built into the new bit to channel a greater volume of drilling fluid on the cutters themselves, Fig. Modern design of the bearing Drill bits with side air circulation which are used for drilling from very soft to extra hard formations The cutting structure of the drill bits … ��T��.�~a[ڛ~tR 0000103470 00000 n 0000014587 00000 n CASE STUDY: HUDSON RANCH TRIALS Multiple Kymera hybrid bits have been employed at EnergySource’s Hudson Ranch II project and met the expectations of 0000011954 00000 n Drill bit design is one of the major factors affecting the ROP during drilling process [5]. View Lec.2 PeE413-Drill Stem - 2.pdf from PE 316 at University of Basrah. Computers have also caused dramatic changes in the drill-ing bit manufacture process, as today the use of bottomhole simulation software in order to have a new bit design “virtu- An open spiral-flute design clears chips quickly, so these bits can bore smooth, deep holes through construction lumber, railroad ties, and utility poles. Drill bits come in many sizes and shapes and can create different kinds of holes in many different materials. %PDF-1.6 %���� This improves tracking to hold azimuth and inclination, which increases rate of penetration (ROP) and reduces dogleg severity for Twist drill bits* 3000 3000 1500 750 3000 1500 750 500 2500 2000 1500 NR 3000 1200 750 400 3000 2500 1500 1000 3000 1000 600 350 Lubricate drill with oil when cutting steel 1/ 8" or thicker. 0000107450 00000 n 11 Design Factors Various Bit Style 12. 0000011302 00000 n Although we have a global footprint, our service is local by design. Fast-Cutting Drill Bits for Wood 0000016126 00000 n Compare bit performance to identify best bit design. Drill Bit 5. Step drill bit. The deeper you go, the wider the hole becomes. 0000001840 00000 n Second a new design for the bit’s bearings is Tool joint torsional capacity check 5. 0000020561 00000 n [��q����hUo�����1����VY#�(F]t)�5���9�=�4Au#����:��#�C=&��~(�>�JP��ꚺ�5���D�'Ĩ����0M�=���L]�%A�3f����:�ؿ�����C���a��u~:�J��@+��M�}��2�>yQ�B-z��DC�sP�o�)?���h}ee|U�����٘�8�~����w���V���Vr�S�馬j�a��.�0&2P z�@�.� �K��#T�fP0� Xo\��nV��V�e�.�č�f�_A9[�J��7�h�00ܱ����1gey3�N:��|3\ $v���A3\��(��D���&�`�$�����i�iqn L����Ȝ��N��n��ت�ZLA�›@��`���gk�$��%��Pg�䬖PX]����Pg���/J���8Yl5��N First, a new pattern for distribution of inserts over the cone is presented, which results in reduced vibration of the drillstring. Bit Design—Top to Bottom Individual bits are one of the least expensive pieces of hardware used in drilling operations, yet the return on millions of investment dollars often depends as much on bit performance as on any other single component of today’s complex drilling systems. A tap drill chart is key in matching pairs of female and male thread that tightly secure together. The short and stubby teeth are design for hard formation, simply to fracture it by the application of high compressive loads Tooth shape 11. Its design incorporates a stair like appearance. This design breakthrough provided for more advanced bit hydraulics and significantly improved bit As the drill string is rotated, the bit cones roll along the bottom of the borehole in a circular motion. 2). They have a high rate of application in The Computer-Aided Design ("CAD") files and all associated content posted to this website are created, uploaded, managed and owned by third party users. Meanwhile, standards-setting firms have been working to advance new guidelines for drill bit inspection and acceptance. Results: Documented significant reduction of shock and vibration and stick/slip when using SDi519 directional drill bit designed with the IDEAS platform. 4.2.1 Concept Screening of Drill Bit Sharpening Jig 33 4.2.2 Concept Scoring of Drill Bit Sharpening Jig 34 4.4.1 Data from the surface roughness analysis 38 4.4.2 Average Minimum Surface roughness (µm) for both holes on the workpiece39 4.4.3 The difference of surface roughness(µm) 39 Drill bits made of low carbon steel are made from as little as 0.005 – 0.3% carbon, and require constant sharpening and polishing, which is why they are inexpensive to purchase so you get what you paid for. !f�3MH�5��6�c)����W��1 �����P^��KN|�Pa�qS]���0�S�:�)� � i���X(�����&~�z���M}ͅ�F��dž6tC��5~-�[��d�� `V�A@[�~yi��@�\@G|��Ù����P|!��)Hd�ס�je�10ڈn��n��nNQ$�-ǵ����xӸ�$R\6uWV[�$k�-�p#L�"�9:�*�qג�K!\�"�${<5 �V�O�6��\�F��vEs�]�|K|�L�J�lMU�!Xq�\#n�~'-�'F Drill bits come in standard sizes, described in the drill bit sizes article. "��H�`5'��8�d�a� �`r;B��+�t^" _�H �h�b��U��U��a�@�@H���&F&y��GI��{� /� �O�LX���Ui$! Both the bit design and the manufacturing processes are generated simultaneously. design for the thrust bearings (see Figure 5). Each CAD and any associated text, image or data is in no way sponsored by or affiliated with any company, organization or real-world item, product, or good it may purport to portray. 118° bits are capable of penetrating steel but the steeper cutting angle will dull quicker. 0000016343 00000 n As they roll, new teeth come in contact with the bottom of the hole, chipping the formation below and around the bit tooth. There are a variety of standards used to define drill sizes, the most common one in the UK is the British Standard BS 328 set which includes twist drill bit sizes between 0.2 mm and 25 mm. ]j����x�`�� Oϊ�/tܡ�6+c|C6ֵ���V�0)���x��bqpD��C�>u����r��~��=�Q,G��� �ƨ��a�m�n``�8L�So�iwsb�J�d=0�Y �|&7_�Cs�>�6����W!�`��� ��C�nI�y���( �?A%��\�;������J��{$ gj0 I� M�!dl �����@)EZ���y�R0o�cR���Z��G�}8�[p_,�U���)�tyߋ����Y�k&M`�6���������B����;lb��E�#�r��+%=�M*r��I�h�ӟ,&!�B�g�ְC?8�3�h��,�S�,��HQ/Y�ﺧ���d@.���~ P%���6oX%��oշ\��>�MM(H�|_����j�k)5��79�Νɝ�a1����O�ߺ���h���{hRA�J�p}����[��֚��I�P�[�N��3�ap3%�,^�����Ku�c��v��Gn�����:U 3. Q)p �a���π��B��B{��I!��eA2���#Og����(F�U�s�p��)T ��e o�����K��xx �. 1/2" Corded Drill 600-1,200 18V Cordless Drill 1,500-2,500 Pneumatic Drill 2,000-3,000 135° Bits are intended for hardened materials and cut less aggressively than 118° Drill Bits. 681 0 obj <>/Encrypt 656 0 R/Filter/FlateDecode/ID[<20BBCE76363FDD4287B81BF1DDEE9B98>]/Index[655 73]/Info 654 0 R/Length 117/Prev 798146/Root 657 0 R/Size 728/Type/XRef/W[1 3 1]>>stream In order to create holes drill bits are usually attached to a drill, which powers them to cut through the workpiece, typically by rotation. Drill Bits. 0000104401 00000 n The short and stubby teeth are design for hard formation, simply to fracture it by the application of high compressive loads Tooth shape Claw bits are available in sizes from 3 1/2" to 24" and with a variety of cutter quantity options. 5. To choose a Standard Drill Bit Sizes Pdf you just need to take advantage of our review, which presents a range of products for any budget and wishes. Drill bit basics The drilling bit industry is changing rapidly in the areas of manufacturing technology and the use of new materials. • Reduced Straight Shank: drill shank diameter is smaller than the drill bit size (cutting diameter). 0000026321 00000 n 0000010781 00000 n Return to Previous Page Printable Version Download: In general when operating a drill at a speed anywhere within its range for the particular material involved, increases in speed result in fewer holes before regrinding becomes necessary, and reduction in … pդ�y7.��J%�`�T�h%VqI��z�=���Pχ�Q���C��o�ICj�(��]��H��#|��7 f uE��{H�K��i���:�N�C���]�fVD�_��%7I����x��HaȢ |Ǟ�$����8.�G1�o��4F%��RPY��b���b�3�,�58��跪�^�t7��Ѳy]��=2X���5n��3L���V�8�6q����ݭw�y�.���$&������.����y�2x�{�9D 3. • Rig handling of HWDP’s is faster and safer than drill collars. Also known as pole or ship auger bits. The stepped design allows you to use a single bit to drill holes with different diameters. 23 Printable Tap Drill Charts [PDF] A drill and tap chart is what specifies the right size of drill bit that one can use to create the correct sized opening that would complement tap dimensions. A comprehensive analysis of the twist drill point geometry is made in order that the high-speed digital computer can be used as an aid in the design of a drill. The deeper the hole is, the more 0000017508 00000 n 0000107385 00000 n For example, 18,000-20,000 ft wells in South Texas are now typically completed in 70-80 days using PDC bits … 0000106037 00000 n Required Length of Drill tungsten carbide insert (TCI) bits is in the Kymera’s combination of roller-cone design and polycrystalline diamond compact (PDC) bit design. 0000024149 00000 n (total bit force imbalance) is displayed as an output to indicate how the bit will perform in the application. 0000102737 00000 n The design of soil nailed faces should incorporate a diamond grid layout to ensure efficient distribution of the reinforcement. 0000104257 00000 n F =(C1w+C2h)lσp (1) Eq. 0000025255 00000 n 0000027526 00000 n Feed Per Drill Revolution Cutting Speeds - by Working Material Deep Hole Drilling Parameters Holes that fall into the “deep-hole drilling” category are three or more drill bit diameters in depth. Figure 3 depicts a reverse rotary drill rig. 0000102386 00000 n 111 0 obj <> endobj xref 111 53 0000000016 00000 n 0000013363 00000 n Performance is measured H�$TyPg���F��� QÍ4�(� ����b<8��e�%JI��]u7�1ʊ�z�%D��$+J�h������1���������$�dI�.Q1��������)��,����2��R��D���Ónv��W������`�>U�ws�ə�I��A�*+k]V�1�?#3W�Z���_R��)�H��7$d��>p�����̬���YzCAfA�_\^nf��>��(?4 �h4����m*ؐ�]⟞�-����$?S����"��'�H�r�(#TD����y1��!�m2�� �q� � r!AF�~)[h�@Im"���!C���9�]�-K�e��.�&������_��T�c�a�m����t��Ic�0��Ⱦ��5r�|��L~���>��{딥S�Ly�p�aX��Q�P|������k.�+�:�����;�+Ye�r��R%��U���t���q��.���k�V;>����g�R�f'V��U0ݫxg0Ʀ�1Ͷ��������a���'�Y\ *�$�L�3�|Q|� Arab J Sci Eng (2018) 0000002789 00000 n Drill pipe selection anddesign 2. 0000027639 00000 n The long teeth are design to drill soft formations with low compressive strength where the rock more yielding and easily penetrated. In trials at EnergySource’s Hudson Ranch II project, performance data from 12.25- in (311 mm) and 9.875- in (250.8 mm) Kymera bit runs are compared to TCI bit runs in offset wells. Our sales and product spe-cialists are stationed in your communities so we can understand your needs and deliver solutions efficiently and responsively. As part of our continuous improvement process, as solutions are developed, the knowledge is captured and applied going forward, to advance performance in similar situations. These drill sizes are readily available OTS. Tools for Well Design Engineering A well log provides information to make well design decisions. The shank is the part of the drill bit grasped by the chuck of a drill. Mar 21, 2019 - Explore Levent Erdem's board "Tap chart" on Pinterest. Drill bits of different geometry and design are used for core drilling. They can provide for faster penetrating bits than conventional matrix designs. Air or drilling fl uid lift the crushed rock … 727 0 obj <>stream T����.g�q�9����y�>�(F�K���%� �e��x� �1�A\�H��8��\@�K`k%[q��) �A �H��Ľˠ�] �ig endstream endobj 112 0 obj <>>>/Metadata 109 0 R/Outlines 102 0 R/PageLayout/SinglePage/Pages 108 0 R/Type/Catalog/ViewerPreferences<>>> endobj 113 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/Properties<>/XObject<>>>/Rotate 0/Tabs/W/Thumb 103 0 R/TrimBox[0.0 0.0 612.0 792.0]/Type/Page>> endobj 114 0 obj [115 0 R] endobj 115 0 obj <>/Border[0 0 0]/H/N/Rect[34.0 768.0 578.641 726.554]/Subtype/Link/Type/Annot>> endobj 116 0 obj <> endobj 117 0 obj <>stream 0000008410 00000 n If the increase is proportionate, the bit is efficient. %%EOF For this drill bit, you will find it ideal for drilling different hole sizes on a sheet metal. With most drill bits, there are charts that will allow you to more easily match the job with the drill bit size. 0000002655 00000 n Every Halliburton drill bit is custom designed for its specific application. As much as a step drill bit can be pricey, it remains a versatile bit to own. Bottom Hole Assembly BHA The primary component of the BHA is the drill collar. See more ideas about Tap chart, Chart, Drill. Surface-set bits contain a single layer of big diamonds, layered bits are made of diamonds of medium size and small size, and impregnated bits have diamond fragments distributed irregularly throughout the copper matrix of the crown. • available for hole cleaning and bit drive. Drill Bit 2. Drill Bit Jet Nozzles Optimization depend on Graphical Method. On brick, concrete, and stone, use masonry bits. A tap drill chart is key in matching pairs of female and male thread that tightly secure together. A reverse rotary drill rig also requires more space to operate, more space for a larger settling pond, and access to a large supply of clean water but it can drill wells larger than 22 inches in diameter. endstream endobj startxref According to [6], drill bit designers improve some design features in order to obtain desired drilling performance [6]. › Step 2A: Existing Bit Design If appropriate, an existing bit design is recommended to meet the requirements of the GeoScience analysis. 118° 135° Most general purpose twist drills are designed to bore a variety of materials well, but no single material most efficiently. Design Objectives for PDC Bits Rate of Penetration • Less rig time = savings • Efficient transfer of forces from surface to bit Durability • Fewer bits to drill a section = savings • Cutter wear Steering • Predictable tool face (torque) • Minimize walk Science-ing up Deep Earth Drill Bits - 11/18/20 %PDF-1.7 %���� Polycrystalline diamond compact (PDC) drill bit design influences bit hydraulicsthe and hence the drilling performance. Drill stem design II Drill Stem 1. }a���N]�'�R�8g�\R�4���˯�m�_u�^�1�aeba���]�#p~����?с �b{mT�Pt!��x��EqeQ{Hu ƚ��P)�jt�,.D&B��E#�D�FE��E�E���%��qam@h���Q㘄�qT�K��G^�ͼB��c�̯���}��;�sn�@�Ɩ~��dAxs5!��f�H=4 ��J��.�̣.J��ˀ��e��Vgt���z��輛��x�a?�s�X�v�?`�m�>���\�&��g�!�B�e��ُ̆�C�7��Z=���An�ډ>��ON}x���.ii�]9�xb��g67�7b�� �����y>괭�P��M���KG9�ڨ����j���?�C��: g�� �@��sT������WB\D�i���e}&8H�ܓ�&. Download full-text PDF Read full-text. 0000028628 00000 n Some projects call for specific drill bit sizes, but a set that includes bits from 1/16 inch to 1/4 inch will handle many jobs around the home and workshop. �R�0tGK ��ŹWV0�G�~{*�[&��z��H�Z���`QÁ���l�� I�ǛE{}M��_�D ig��+n�����ԫ&Z���u�,BDz�Ogt����Xg

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