Threading with taps Geers Industrie

Threading With Taps Geers Industrie-Free PDF

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Threading with taps,GENERAL HINTS ON TAPPING, The success of any tapping operation depends on a number of factors all of which. effect the quality of the finished product, 1 Select the correct design of tap for the component material and type of hole i e. through or blind from the Application Material Groups chart. 2 Ensure the component is securely clamped lateral movement may cause tap. breakage or poor quality threads, 3 Select the correct size of drill from the tapping drill charts see pages 76 79. The correct sizes of drill are also shown in the tap pages of the catalogue. Remember the drill sizes for fluteless taps are different Always ensure that work. hardening of the component material is kept to a minimum see stainless steel. part in General Information section, 4 Select the correct cutting speed as shown in the Visual Index in the Catalogue. and in the Product Selector, 5 Use appropriate cutting fluid for correct application.
6 In NC applications ensure that the feed value chosen for the program is correct. When using a tapping attachment 95 to 97 of the pitch is recommended to. allow the tap to generate its own pitch, 7 Where possible hold the tap in a good quality torque limiting tapping. attachment which ensures free axial movement of the tap and presents it. squarely to the hole It also protects the tap from breakage if accidentally. bottomed in a blind hole, 8 Ensure smooth entry of the tap into the hole as an uneven feed may cause bell. Threading with taps,TAP GEOMETRIES AND TAPPING PROCESS. Type Variants Process Description Chips,Taps with straight flutes. Straight flutes are the most commonly,used type of tap Suitable for use on.
most materials mainly short chipping,steel and cast iron they form the basis. of the program,Taps with interrupted thread,The interrupted thread ensures less. friction and therefore less resistance,which is particularly important. when threading material which is,resilient and difficult to machine e g. aluminium bronze It is also easier,for lubricant to penetrate to the cutting.
edges thus helping to minimise the,torque generated. Spiral point taps,The tap has a straight fairly shallow. flute and is often referred to as a gun,nose or spiral point tap The gun nose. or spiral point is designed to drive the,swarf forward The relatively shallow. flutes ensure that the sectional strength,is maximised They also act to allow.
lubricant to reach the cutting edges,This type of tap is recommended for. threading through holes,Threading with taps,Type Variants Process Description Chips. Taps with flutes only on the,chamfer lead,The cutting part of the tap is formed by. gun nosing in the same manner as for,a spiral point tap the function being to. drive the swarf forward ahead of the,cutting edges This design is extremely.
rigid which facilitates good machining,results However the short length of. the gun nosing limits its application to a,depth of hole less than about 1 5 x. Taps with spiral flutes,Taps with spiral flutes are intended. primarily for threading in blind holes The,helical flute transports the swarf back. away from the cutting edges and out of,the hole thus avoiding packing of swarf.
in the flutes or at the bottom of the hole,In this way danger of breaking the tap or. damaging the thread is minimised,Cold forming taps. Cold forming taps differ from cutting taps,in that the thread is produced by plastic. deformation of the component material,rather than by the traditional cutting. action This means that no swarf is,produced by their action The application.
range is materials with good formability,Tensile strength Rm should not exceed. 1200 N mm2 and the elongation factor,A5 should not be less than 10. Cold forming taps without flutes are,suitable for normal machining and. are especially suitable when vertically,tapping blind holes They are also. available with through coolant,Threading with taps.
Type Variants Process Description Chips,Through coolant taps. The performance of taps with,through coolant holes is higher than. the same taps used with external,lubrication These kinds of taps allow. better evacuation of the chip which,is transported away from the cutting. area itself Wear on the cutting edge,is reduced since the cooling effect.
on the cutting zone is higher than the,heat generation. Lubrication can be oil emulsion or,air pressurised with oil mist Working. pressure not less then 15 bar is,required but good results can be. obtained with minimal lubrication,These taps are generally used to. thread nuts but can be used also,on deep through holes They have.
a shank diameter smaller than,the nominal and a longer overall. length because their function is to,accumulate nuts. They are used on special machines,designed to thread huge amounts. of nuts They can work in steel and,stainless steel. The first serial tap has a very long,chamfer in order to spread the.
cutting load on almost two thirds of,the thread length. Threading with taps,POINT CHAMFER MATRIX, The type of point on taps is up to the producer to choose Below is a chart showing the. points and chamfers that are commonly used together on products from Dormer sorted. by the diameter of the tap,Types of Point, Full Point Reduced point Internal point Removed point. Chamfer Form,5 1 1 1 1 1,5 6 1 1 1 2 1 1,6 10 1 2 1 1 2 4 1 2 1 4. 10 12 2 3 2 3 2 3 2 3 2 3,12 3 3 3 3 3,ANSI Taper Plug Bottoming.
THREAD OR COLD FORMING GEOMETRIES AND PROCESS,Advantages compared with cutting taps. Cold forming is faster than ordinary thread cutting. Cold forming taps often give a longer tool life, One type of tool can be used in different materials and for both through and. blind holes, Cold forming taps have a stable design which gives lower risk of breakage. Threads to the correct tolerance are guaranteed, Stronger thread higher stripping strength compared to thread obtained by. cutting up to 100 more, Lower surface roughness on thread obtained by forming than by cutting.
Pre conditions for effective use,Sufficent material elongation. Precise drilled hole diameter,Good lubrication is imperative. Threading with taps,FLOW OF MATERIAL WHEN FORMING A THREAD. The tapping hole size depends upon the material being drilled the cutting conditions. selected and the condition of the equipment being used If material is pushed up at the. thread entry by the tap and or the life of the tap is too short select a slightly larger drill. diameter If on the other hand the profile of the thread formed is insufficient then select. a slightly smaller drill diameter,Drilled hole for a. cutting tap,Drilled hole for a,forming tap,Section of thread obtained by.
forming tap on steel C45, Cold forming taps require more power on the spindle compared to a cutting tap of the. same size since it generates higher torque,M6 blind hole Vc 30 m min 90 SFM. Torque comparison between forming and cutting taps in different. material groups,Threading with taps,VANGARD SHARK COLOUR RINGS APPLICATION TAPS. Colour Material Tool types available,AMG 1 1 AMG 1 4. AMG 1 1 1 5,AMG 1 4 1 6,AMG 1 5 1 6,AMG 4 2 4 3,AMG 2 1 AMG 2 3.
AMG 3 1 AMG 3 4,AMG 5 1 5 3,AMG 7 1 7 4,Threading with taps. THREAD PROFILES,ISO threads,Metric threads M,Unified threads UN. H 0 86603 P,Hm 5 8H 0 54127 P,Hs 17 24H 0 613343 P. H 8 0 10825 P,H 4 0 21651 P,R H 6 0 14434P,Whitworth W BSW. BSF G Rp ADMF Brass 1 4,BS Conduit ME,H 0 96049 P,H 2 3H 0 64033 P.
H 6 0 16008 P,R 0 13733 P,Whitworth conical pipe threads. Rc BSPT Conical 1 16,H 0 96024 P,H 2 3H 0 64033 P,R 0 13728 P. American conical pipe threads,NPT Conical 1 16,H 0 8668 P. H 24 0 033 P min value,Steel conduit threads,H 0 59588 P. H 0 4767 P,Threading with taps,TOLERANCES, THREAD TOLERANCE WITH TAPS FOR METRIC ISO 60 THREAD PROFILE M UN.
Internal thread Tap,Base Basic major,deviation diameter D. Basic major Min major,Diameter diameter,Basic minor Basic pitch. diameter diameter,Basic pitch Max pitch,diameter diameter. H fundamental d2min,Lower deviations,P Pitch E1,Tolerance Upper deviations. for D1 on d2,Tolerance Lower deviations,for D2 on d.
Profile angle P Pitch,R Tap root radius,Tolerance on. pitch diameter,Tolerance on half,profile angle,Internal Thread. Profile angle,2 Half profile angle,USUAL TOLERANCES FOR TAPS AND INTERNAL THREAD. Tolerance class H Tap Tolerance Tolerance class G,Internal Thread Nut Internal Thread Nut. t TD2 Qual 5,A 0 2 t Au,Threading with taps, TABLE OVER TAP TOLERANCE VS TOLERANCE ON INTERNAL THREAD NUT.
Tolerance class Tap,Tolerance Internal thread,ANSI Application. ISO DIN Nut,Fit without,ISO 1 4H 3B 4H 5H allowance. ISO 2 6H 2B 4G 5G 6H Normal fit,Fit with large,ISO 3 6G 1B 6G 7H 8H allowance. Loose fit for,7G 7G 8G following treatment,or coating. Thread tolerances for taps are collected in standard reference DIN 13. Normal tolerance is ISO 2 6H on taps which generates an average quality fit between. screw and nut Lower tolerance ISO 1 generates a fine fit without a gap on the flanks. between screw and nut Higher tolerance ISO 3 generates a rough fit with large gap It. is used in the case of a nut which will later be coated or if a loose fit is preferred. Between tolerances 6H ISO2 and 6G ISO3 as well as between 6G and 7G the. tap manufacturer produces taps with tolerance 6HX and 6GX X means the tolerance. is outside standard and it is used for taps working high strength material or abrasive. material such as cast iron These materials do not cause oversize problems so higher. tolerance can be used in order to increase tool life The width of the tolerance is equal. between for example 6H and 6HX, Forming taps are usually produced with a 6HX or 6GX tolerance.
The tolerance icon for BSW and BSF is medium This refers to BS 84 medium fit. Pipe threads with the tolerance icon Normal refer to the following standards. G threads to ISO 228 1 One class for internal thread tap and class A and B for. external thread die,R Rc and R threads to ISO 7 1,NPT and NPSM to ANSI B1 20 1. NPTF and NPSF to ANSI B1 20 3,PG to DIN 40 430,Threading with taps. CHAMFER LENGTHS AND SERIAL TAPS, The first group No 1 No 2 No 3 includes taps with complete thread profile and the. difference is in the chamfer length The second group No 4 No 5 includes taps with. incomplete thread profile They have lower pitch and outer diameter compared to the. complete standard and longer chamfer After using them a finishing tap No 3 must. No 1 6 8 x P,No 2 4 6 x P,No 3 2 3 x P,No 4 6 8 x P. No 5 3 5 5 x P,ISO Set code number Including tap number.
No 6 No 1 No 2 No 3,No 7 No 2 No 3,No 8 No 4 No 5 No 3. No 9 No 5 No 3,DIN Set code number Including tap number. No 8 No 3 form C No 4 form A No 5 form B,No 9 No 3 form C No 5 form B. ANSI Set code number Including tap number,Hand Tap No 6 Taper No 1 Plug No 2 Bottoming No 3. Threading with taps, DRILL DIAMETERS FOR CUTTING TAPS RECOMMENDATION TABLES.
Drill diameter can be calculated from D Drill diameter mm. Dnom Tap nominal diameter mm,D Dnom P P Tap pitch mm. ISO METRIC COARSE THREAD ISO METRIC FINE THREAD, TAP Max DRILL DRILL TAP Max DRILL DRILL TAP Max DRILL. Internal Internal Internal,Pitch Diam Diam Diam Diam Diam Diam Diam Diam. M mm mm mm inch MF mm mm inch MF mm mm, 1 6 0 35 1 321 1 25 3 64 3x0 35 2 721 2 65 37 25X1 24 153 24. 1 8 0 35 1 521 1 45 54 3 5x0 35 3 221 3 2 1 8 25X1 5 23 676 23 5. 2 0 4 1 679 1 6 1 16 4x0 5 3 599 3 5 29 25x2 23 210 23. 2 2 0 45 1 833 1 75 50 5x0 5 4 599 4 5 16 26x1 5 24 676 24 5. 2 5 0 45 2 138 2 05 46 5 5x0 50 5 099 5 9 27x1 5 25 676 25 5. 3 0 5 2 599 2 5 40 6x0 75 5 378 5 3 5 27x2 25 210 25. 3 5 0 6 3 010 2 9 33 7x0 75 6 378 6 3 D 28x1 5 26 676 26 5. 4 0 7 3 422 3 3 30 8x0 75 7 378 7 3 9 32 28x2 26 210 26. 4 5 0 75 3 878 3 8 27 8x1 7 153 7 J 30x1 5 28 676 28 5. 5 0 8 4 334 4 2 19 9x1 8 153 8 O 30x2 28 210 28, 6 1 5 153 5 9 10x0 75 9 378 9 3 U 32x1 5 30 676 30 5.
7 1 6 153 6 15 64 10x1 9 153 9 T 32x2 30 210 30, 8 1 25 6 912 6 8 H 10x1 25 8 912 8 8 11 32 33x2 31 210 31. 9 1 25 7 912 7 8 5 16 11x1 10 153 10 X 35x1 5 33 676 33 5. 10 1 5 8 676 8 5 Q 12x1 11 153 11 7 16 36x1 5 34 676 34 5. 11 1 5 9 676 9 5 3 8 12x1 25 10 912 10 8 27 64 36x2 34 210 34. 12 1 75 10 441 10 3 Y 12x1 5 10 676 10 5 Z 36x3 33 252 33. 14 2 12 210 12 15 32 14x1 13 153 13 17 32 38x1 5 36 676 36 5. 16 2 14 210 14 35 64 14x1 25 12 912 12 8 1 2 39x3 36 252 36. 18 2 5 15 744 15 5 39 64 14x1 5 12 676 12 5 31 64 40x1 5 38 676 38 5. 20 2 5 17 744 17 5 11 16 15x1 14 153 14 35 64 40x2 38 210 38. 22 2 5 19 744 19 5 49 64 15x1 5 13 676 13 5 17 32 40x3 37 252 37. 24 3 21 252 21 53 64 16x1 15 153 15 19 32 42x1 5 40 676 40 5. 27 3 24 252 24 61 64 16x1 5 14 676 14 5 9 16 42x2 40 210 40. 30 3 5 26 771 26 5 1 3 64 18X1 17 153 17 43 64 42x3 39 252 39. 33 3 5 29 771 29 5 1 5 32 18X1 5 16 676 16 5 41 64 45x1 5 43 676 43 5. 36 4 32 270 32 1 1 4 18X2 16 210 16 5 8 45X2 43 210 43. Cold forming taps require more power on the spindle compared to a cutting tap of the same size since it generates higher torque M6 blind hole Vc 30 m min 90 SFM Drilled hole for a cutting tap Drilled hole for a forming tap Threading with taps Torque comparison between forming and cutting taps in different material groups

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