ical ▁point ▁as ▁for ▁a ▁round ▁p enc il , ▁abandon ing ▁some ▁distinct ive ▁aspects ▁of ▁the ▁car p enter ' s ▁p enc il . ▁ ▁Mechan ical ▁p enc ils ▁with ▁thin ▁diameter ▁leads ▁disp ense ▁the ▁graph ite ▁lead ▁progress ively ▁during ▁use ▁and ▁thus ▁do ▁not ▁require ▁sh ar pen ing ; ▁such ▁p enc ils ▁are ▁sometimes ▁called ▁" self - sh ar pen ing ". ▁A ▁type ▁of ▁mechanical ▁p enc il ▁has ▁a ▁rot ating ▁g ear ▁mechanism ▁which ▁rot ates ▁the ▁lead ▁slightly ▁every ▁time ▁the ▁lead ▁is ▁lifted ▁off ▁the ▁paper , ▁helping ▁to ▁maintain ▁a ▁consistent , ▁sharp ▁point . ▁ ▁If ▁a ▁fin er ▁or ▁bro ader ▁line ▁is ▁needed , ▁a ▁separate ▁mechanical ▁p enc il ▁using ▁a ▁lead ▁with ▁a ▁different ▁diameter ▁is ▁required . ▁ ▁Gallery ▁ ▁See ▁also ▁ ▁Mechan ical ▁p enc il ▁ ▁References ▁ ▁External ▁links ▁ ▁André ▁Gra hl : ▁History ▁of ▁p enc il ▁sh ar pen ers ▁and ▁pointers ▁Video ▁of ▁production ▁of ▁hand - h eld ▁p enc il ▁sh ar pen ers ▁ ▁Category : Office ▁equipment ▁Sh arp ener ▁Category : Sh ar pen ing ▁Category : Me chan ical ▁hand ▁tools ▁Category : Dom estic ▁implements ▁Category : Art icles ▁containing ▁video ▁cli ps ▁Category : 1 8 2 8 ▁introdu ctions <0x0A> </s> ▁Al am ▁Ro za ▁is ▁an ▁area ▁located ▁in ▁Ah med abad , ▁India . ▁ ▁RE ferences ▁ ▁Category : Ne igh