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Tham khảo tài liệu 'sổ tay tiếng anh kỹ thuật part 10', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 635 BẢNG 12 DAO CAT LÚP TIÊU C.HUAN mỹ Đẻ gia cộng ĐĨA XÍCH lăn Table 12. AMERICAN STANDARD STRADDLE CUTTERS FOR . ROLLER-CHAIN SPROCKETS Construction. p Pitch Dr roller diameter and N number of teeth on which cutter is based. Draw XT and the two seating-curve circles xd and x rf as explained in Table 9. Locate c and c from the dimensions K and J as given in this table. Locate b and y. Draw cor and r tf x and with centers c and d draw the working curves xy and . Draw ys and s perpendicular to cy and y respectively. Draw Ề3 and ftV parallel to cy and c respectively. With b and bf as centers and radius bi equal to F see table strike the arcs of the topping curves. Cutter width is p 4- Dr. Cutter diameters are as given in Tableu for 35 and over teeth. N number of teeth on which cutter is based A 35 N K 0.8 Dr cos A i J 0.8 Dr sin A i E ex 1.3025 Dr 0.0015 F - Dr 0.8 cos 18 j 4-1.24 cos 17 j 1.3025 J 0.0015 120 _ Maximum pressure angle new chain Xữb as 35 -77- 24.1 for B cutter N and 32 for A cutter. . 64 a Minimum pressure angle xab ffey 17 m Ilia or B cutter and N 15.4 for A cutter. 02 __ _ Average pressure angle 26 17.6 for B and 23.7 . for A cutter. There will be on the sprocket bottom diameter slight indentations for smaller and slight projections for larger sprockets than the specific sprockets 11 and 40 teeth for which cutters are designed. Data for Laying Out Straddle Cutter Cutter No. of Teeth to be Cut K J F B A 17 and under 18 and over 0.730 Dr 0.678 Dr 0.327 Dr 0.424 Dr O.Ổ937 Dr 0.0015 0.6596 Dr 0.0015 Cutter No- of Teeth to be Cut Chord xy y B B A 17 and under 18 and over 0.2928 Dr 0.0003 0.376 Dr 0.0Ó04 0.0617 Dr 0.1007 Dr 1.302s Dr O.OOIJ 1.3025 Dr 0.0015 Only two cutters of this type are required to cover the entire range of teeth t Notỉrécomxnended for Type II see footnote to Table 9 sprockets. 636 BẢNG 13 THIẾT kẾ dao phay phác hình đỂ gia công _ ĐĨAXÍCHLĂN Tobỉe 13. STANDARD HOB DESIGN FOR ROLLER-CHAIN SPROCKETS ASA B29.1-Ì957 Section Normal
