Page 445 - Content.pmd

ùNuPo úXj§u UûW«ÓRp RjÕYm (Principle of cutting screw thread in centre
lathe)

úSôdLeLs : ClTôP Ø¥®p ¿eLs ùT\ úYi¥V A±Ü §\uLs
• Jtû\ Øû] ùYhÓ°ûVd ùLôiÓ UûWLs ùYhÓm RjÕYjûRd á\p
• UûW ùYhÓm ÖhT AûUl©u Es[ TôLeLs Utßm AYt±u ùNVpØû\Lû[l
Tt±d á\p
• Uôtßl TtNdLWeLû[d LQd¸Ó ùNnÙm ãj§WjûR ùTßRp.
ñ¬ó ªõ†´‹ õ‹ (Thread cutting principle)
Gig 3
å¼ à¼¬÷ò£ù Ü™ô¶ ˹ õ®õŠ ªð£¼O¡
e¶ å«ó ñ£FKò£ù ‘²¼œ’ õKŠðœ÷ˆ¬î (helical TQJOEMF HFBS
groove), ðEŠªð£¼¬÷ å«ó ²ö™ «õèˆF™ ²öô
UVNCMFS HFBS
¬õˆ¶ ðEŠªð£¼O¡ å¼ ²ŸÁ‚° ñ¬óJ¡
¹Kò÷¾
TUVE HFBS )ESJWFS)
Fig 1 STUD GEAR CARRIAGE

GEAR
FIXED ON
SPINDLE
JEMFS HFBS

MFBE TDSFX
HFBS )ESJWFO)

ñ£ŸÁŠ ðŸê‚èóƒèÀ‚è£ù
ňFóˆ¬îŠªðÁî™ (Derivation of the formula
TUMBLER
GEAR for change gears)
IDLER
GEAR GEAR ON LEAD SCREW àî£óí‹ (Example)
TRANSMITTING MOTION FROM SPINDLE TO CARRIAGE
ñ£FK1 (Case 1): 4 I.e ¹Kò÷¾ àœ÷ º‰¶
ÉóˆFŸ° (pitch) ªõ†´O¬ò ïèó„ ªêŒ¶, ñ¬óˆ  àœ÷ è¬ìê™ Þò‰FóˆF™, 4
à¼õ£‚°î™ ñ¬óªõ†´õF¡ õñ£°‹. I.e. ¹Kò÷¾ ªè£‡ì ñ¬ó¬ò å¼ ªð£¼O™
ªõ†´õ. ðEŠªð£Ú°u å¼ º¬ø
º‰¶ ñ¬óˆ Âì¡ (lead screw rod)
²ŸÁ‹ «ð£¶, º‰¶ ñ¬óˆ  4 I.e.
Þ¬í‚èŠð´‹ ‘Ü¬ó’’ ‘F¼AJ¡‘ (half of nut) ¶¬í
º¡«ùP„ ªê™ô «õ‡´‹. Ýè«õ
ªè£‡´ è¬ìê™ Þò‰FóˆF¡ õ£èù‹
º¬÷ò£EJ™ (stud gear) 50 ðŸèœ ªè£‡ì
ªõ†´O¬ò ï蘈¶Aø¶. ê£¬í ªêŒ¶
ðŸê‚èó‹ Þ¼‰î£™ (driver) º‰¶ ñ¬óˆî‡®™
õ®õ¬ñ‚èŠð†ì àOº¬ùJ™ õ®õˆF™
50 ðŸèœ àœ÷ ðŸê‚èó‹ ñ£†ìŠðì«õ‡´‹.
ªð£¼O™ ªõ†ìŠð†ì ñ¬óJ¡ õ®õ‹
Þî¡ ðòù£è º‚Aò ²ö™ ™ Ü«î
Þ¼‚°‹. º‰¶ ñ¬óˆ ¡ ²ö½‹ F¬ê
²ŸÁ‚è¬÷ ܶ ªðÁ‹. (Fig 3)
ðEŠªð£¼O™ ªõ†ìŠð´‹ ñ¬óJ¡ èóñ£è
ñ£FK 2 (Case 2): «ñŸ°PŠH†ì Ü«î è¬ìê™
(Hand of Thread) Þ¼‚°‹.
Þò‰FóˆF™ 4 I.e ¹Kò÷MŸ°Š ðFô£è 2
ñ¬ó ªõ†´îL™ ê‹ð‰îŠð†ì ð£èƒèœ
I.e. ¹Kò÷¾ àœ÷ ñ¬óè¬÷ ªõ†´õ.
(Parts involved in thread cutting)
ðEŠªð£¼œ 强¬ø ²ŸÁ‹ «ð£¶, º‰¶
º‚Aò ²ö™ L¼‰¶ ñ£ŸÁŠ ðŸê‚èó
ñ¬óˆ  1/2 ²ŸÁ ²öô «õ‡´‹. Üî£õ¶
ܬñŠ¹èO¡ Íô‹ º‰¶ ñ¬óˆî‡´‚°
º‰¶ ñ¬óˆ ¡ «õè‹ °¬øõ£è Þ¼‚è
Þò‚è‹ ªê½ˆîŠð´õ¬î (Fig 1 & 2)-™ è£íô£‹.
«õ‡´‹. Ýè«õ º‰¶ ñ¬óˆ ¡ ðŸ
õ£èùˆF™ àœ÷ ܬó F¼A(Nut) º‰¶ ñ¬óˆ
ê‚èó‹ (DRIVEN WHEEL) 100 ðŸèœ àœ÷î£è¾‹
î‡´ì¡ Þ¬íõ º‰¶ L¼‰¶
º¬÷ò£E ðŸê‚èó‹ (DRIVER WHEE) 50 ðŸèœ
Þò‚è‹ õ£èùˆFŸ° ªê½ˆîŠð´Aø¶.
àœ÷î£è¾‹ ܬñ‚è «õ‡´‹. (Fig 4)
424 £_õ & Gm: @©hPo (NSQF - Revised 2022) R.T. for Ex.1.7.107