Ascutirea burghielor pe masini universale de ascutit

[bcristian]

 

 

 

Voi prezenta metoda folosita de mine pentru a ascuti bughie pe masini precum cea de mai sus (clone de Deckel SOE).

Masina la origine foloseste metoda de ascutire conica. Un detaliu important din imagine este faptul ca axa conului trece prin coltul opus al burghiului.

 

 

 

 

In practica insa, nu sunt multumit de aceasta metoda, din mai multe motive. Daca tinem burghiul in acelasi loc pe piatra, acestea se vor uza reciproc si isi vor crea profile pereche, in general rotunjind colturile. Nu putem ascuti burghie cu muchia mai lunga decat grosimea pietrei. Asa cum este construita piesa care limiteaza rotatia in jurul conului, la diametre mai mari de 6-8 mm putem atinge muchia opusa. Metoda creeaza o muchie ne-taietoare de-a curmezisul mijlocului brughiului.

 

Eu folosesc urmatoarea metoda.

 

Masina reglata asa (la fel ca in instructiunile originale):

 

 

[url=https://flic.kr/p/2kjuMna][img]https://live.staticflickr.com/65535/50748783807_f724372f56_o.jpg[/img][/url][url=https://flic.kr/p/2kjuMna]MVIMG_20201220_141205[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

Selectam pozitia port-pensetei incat sa avem acces la pozitiile blocabile de 0, 15 si 30 de grade:

[url=https://flic.kr/p/2kjuMgJ][img]https://live.staticflickr.com/65535/50748783492_84463ed3f1_o.jpg[/img][/url][url=https://flic.kr/p/2kjuMgJ]MVIMG_20201220_141446[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

Pe dispozitivul de ascutit, ne trebuie linia axului pivotului:

[url=https://flic.kr/p/2kjuMca][img]https://live.staticflickr.com/65535/50748783227_ca2dc8f6ac_o.jpg[/img][/url][url=https://flic.kr/p/2kjuMca]MVIMG_20201220_141633[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

Asezam burghiul in suport incat sa iasa vreo 10mm in afara. Valoarea exacta nu e importanta (si depinde de diametru), ideea e sa avem spatiu sa ne luam referinta de pozitie pentru a putea sa-l rotim cu 180 de grade mai tarziu. Fixam opritorul longitudinal la pozitie.

[url=https://flic.kr/p/2kjuMbo][img]https://live.staticflickr.com/65535/50748783182_1f76548b3a_o.jpg[/img][/url][url=https://flic.kr/p/2kjuMbo]MVIMG_20201220_141915[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

Un detaliu ne-evident dar esential pentru ascutirea pe astfel de masini: coada burghiului este folosita ca suprafata de referinta. Dar in mod normal aceasta este o suprafata irelevanta pentru utilizarea burghiului, motiv pentru care in multe cazuri aceasta este nefinisata. Este asadar esential sa ne asiguram ca aceasta suprafata are simetrie de rotatie fata de axa burghiului.

[url=https://flic.kr/p/2kjqtjv][img]https://live.staticflickr.com/65535/50747942653_42264bf00d_o.jpg[/img][/url][url=https://flic.kr/p/2kjqtjv]MVIMG_20201220_165508[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

Aliniem muchia taietoare a burghiului cu fata de sus a taieturii din suport.

[url=https://flic.kr/p/2kjuM9E][img]https://live.staticflickr.com/65535/50748783082_6dc11252af_o.jpg[/img][/url][url=https://flic.kr/p/2kjuM9E]MVIMG_20201220_142209[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

Fixam piesa care ne permite rotirea cu 180 de grade a burghiului la pozitie. Eu am facut o alta piesa (decat originalul) din tabla subtire, pentru a putea vedea mai bine punctul de contact. Folosesc contactul pe fata care se vede in imagine (instructiunile originale spun pe cealalta) pentru ca acesta este sensul in care se strange surubul. Invers, exista riscul ca la strangerea surubului opritorul sa se departeze de burghiu. In poza pare ca daca se intampla asa ceva e evident. In realitate burghiulu ala e de 8.2 mm diametru, si punctul de contanct abia se vede. Eroarea devine evidenta doar dupa ce rotesti burghiul si vezi ca polizezi aiurea.

Originalul este sa tii burghiul la pozitie cu mana. Eu prefer un colier de furtun.

[url=https://flic.kr/p/2kjugMC][img]https://live.staticflickr.com/65535/50748684306_65d1c1be55_o.jpg[/img][/url][url=https://flic.kr/p/2kjugMC]MVIMG_20201220_142453[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

Etapa urmatoare e sa aliniem coltul opus al burhgiului cu axa pivotului. Asta e metoda pe care o folosesc eu acum. As putea sa construiesc un suport mai acatarii pentru asta, dar pana atunci merge si asa. Blocul 1-2-3 e aliniat cu axa pivotului, si folosesc o lama de cutter pentru a nimeri coltul opus al bughiului.

[url=https://flic.kr/p/2kjuM5r][img]https://live.staticflickr.com/65535/50748782837_4594483b24_o.jpg[/img][/url][url=https://flic.kr/p/2kjuM5r]MVIMG_20201220_142636[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

[url=https://flic.kr/p/2kjugJb][img]https://live.staticflickr.com/65535/50748684106_810ac03a72_o.jpg[/img][/url][url=https://flic.kr/p/2kjugJb]MVIMG_20201220_142829[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

[url=https://flic.kr/p/2kjqtEA][img]https://live.staticflickr.com/65535/50747943818_0f6f2f0622_o.jpg[/img][/url][url=https://flic.kr/p/2kjqtEA]MVIMG_20201220_143053[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

Strangem suportul tinut la pozitia superioara la 0 grade.

[url=https://flic.kr/p/2kjugFv][img]https://live.staticflickr.com/65535/50748683951_8741507ae0_o.jpg[/img][/url][url=https://flic.kr/p/2kjugFv]MVIMG_20201220_143457[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

Il rotim la 30 de grade si reglam pozitia limitatorului de cursa al masinii astfel incat burghiul sa stearga intreaga fata a pietrei. Aceasta va fi suprafata din spatele fetei de asezare.

[url=https://flic.kr/p/2kjuLVo][img]https://live.staticflickr.com/65535/50748782312_3ef0961399_o.jpg[/img][/url][url=https://flic.kr/p/2kjuLVo]MVIMG_20201220_143532[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

[url=https://flic.kr/p/2kjugBT][img]https://live.staticflickr.com/65535/50748683741_b8151f23d9_o.jpg[/img][/url][url=https://flic.kr/p/2kjugBT]MVIMG_20201220_143723[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

[url=https://flic.kr/p/2kjuLUG][img]https://live.staticflickr.com/65535/50748782272_5a669bcb5d_o.jpg[/img][/url][url=https://flic.kr/p/2kjuLUG]MVIMG_20201220_143955[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

Pentru a vedea cat am luat, la fiecare etapa dam cu marker negru pe varful burghiului.

Luam pana ce trecem de mijlocul burghiului. Cu mana dreapta miscam port-scula stergand fata pietrei, cu stanga avansam (rotim catre noi). Eu iau cam 0.005 - 0.01 mm (o gradatie) la 2 treceri peste piatra.

[url=https://flic.kr/p/2kjuLUG][img]https://live.staticflickr.com/65535/50748782272_5a669bcb5d_o.jpg[/img][/url][url=https://flic.kr/p/2kjuLUG]MVIMG_20201220_143955[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

Dupa ce am trecut de jumatatea burghiului, il rotim, dam avansul masinii inapoi, si repetam cealalta fata.

[url=https://flic.kr/p/2kjqtwe][img]https://live.staticflickr.com/65535/50747943333_bb6e244dfd_o.jpg[/img][/url][url=https://flic.kr/p/2kjqtwe]IMG_20201220_144831[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

Daca burghiul nu era ascutit simetric, fetele ramase nu vor fi simetrice:

[url=https://flic.kr/p/2kjuLPw][img]https://live.staticflickr.com/65535/50748781972_4c32d14c4d_o.jpg[/img][/url][url=https://flic.kr/p/2kjuLPw]IMG_20201220_150147[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

Rotim portscula la 15 grade, si repetam operatiunea. Acestea sunt fetele de asezare.

[url=https://flic.kr/p/2kjqtuA][img]https://live.staticflickr.com/65535/50747943238_baeb67eb19_o.jpg[/img][/url][url=https://flic.kr/p/2kjqtuA]MVIMG_20201220_150829[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

[url=https://flic.kr/p/2kjqtqs][img]https://live.staticflickr.com/65535/50747942998_4ee70d085a_o.jpg[/img][/url][url=https://flic.kr/p/2kjqtqs]IMG_20201220_151150[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

[url=https://flic.kr/p/2kjugt1][img]https://live.staticflickr.com/65535/50748683226_1946275327_o.jpg[/img][/url][url=https://flic.kr/p/2kjugt1]MVIMG_20201220_154545[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

Ideal, luam fetele de asezare pana la jumatate, incat sa ramanem cu un punct in varf.

In practica, putem sa ajungem in varf dar fata taiata sa nu ajunga la marginea burghiului, de exemplu pentru ca are colturile rotunjite. Intrucat e mai important sa ajungem pana in colturi, continuam pana la acestea, apoi revenim la pozitia de 30 de grade si luam iar pana in varf.

[url=https://flic.kr/p/2kjqteW][img]https://live.staticflickr.com/65535/50747942388_02cc1e888a_o.jpg[/img][/url][url=https://flic.kr/p/2kjqteW]MVIMG_20201220_191018[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

Continuam luand alternativ fetele la 15 si la 30 de grade pana cand obtinem rezultatul dorit. Este posibil sa nu putem obtine fete simetrice. Asta se intampla cand burghiul este stramb (burta de 0.1mm pe 100 mm este suficienta pentru un efect clar vizibil) sau cand din fabricatia spiralele nu sunt simetrice. Sau, desigur, daca nu am fost atenti la repozitionarea burghiului.

Unele burghie asimetrice sunt insa folosibile, daca asimetria e doar pe partea care nu conteaza.

[url=https://flic.kr/p/2kjugt1][img]https://live.staticflickr.com/65535/50748683226_1946275327_o.jpg[/img][/url][url=https://flic.kr/p/2kjugt1]MVIMG_20201220_154545[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

[url=https://flic.kr/p/2kjuLMC][img]https://live.staticflickr.com/65535/50748781862_eba1908ebf_o.jpg[/img][/url][url=https://flic.kr/p/2kjuLMC]MVIMG_20201220_154939[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

[url=https://flic.kr/p/2kjqtnM][img]https://live.staticflickr.com/65535/50747942843_9e9c45f6cd_o.jpg[/img][/url][url=https://flic.kr/p/2kjqtnM]IMG_20201220_155010[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

Comparatie intre un burghiu ascutit de mine si unul aproape nefolosit. 10 mm diametru, testate in otel tras la cald, 5-6 mm grosime, suficient cat sa taie cu toata muchia si sa aiba sprijin lateral. Fara pre-gaurire. Forta de apasare necesara e semnificativ mai mica in cazul burghielor ascutite de mine, dar nu am cu ce sa masor, va trebui sa ma credeti pe cuvant. Similar pentru caldura degajata.

[url=https://flic.kr/p/2kjqt76][img]https://live.staticflickr.com/65535/50747941933_8588b94fa2_o.jpg[/img][/url][url=https://flic.kr/p/2kjqt76]MVIMG_20201222_210948[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

[url=https://flic.kr/p/2kjug6x][img]https://live.staticflickr.com/65535/50748681981_15d970ee62_o.jpg[/img][/url][url=https://flic.kr/p/2kjug6x]MVIMG_20201222_211150[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

[url=https://flic.kr/p/2kjug62][img]https://live.staticflickr.com/65535/50748681951_35da4c199b_o.jpg[/img][/url][url=https://flic.kr/p/2kjug62]MVIMG_20201222_211328[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

[url=https://flic.kr/p/2kjug1h][img]https://live.staticflickr.com/65535/50748681676_68b258166b_o.jpg[/img][/url][url=https://flic.kr/p/2kjug1h]MVIMG_20201222_211517[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

[url=https://flic.kr/p/2kjqt14][img]https://live.staticflickr.com/65535/50747941583_00888b140a_o.jpg[/img][/url][url=https://flic.kr/p/2kjqt14]MVIMG_20201222_212023[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

Burghiu de 15 mm, ascutit cu metoda prezentata, fara pre-gaurire. Ultima poza este dupa gaurire, pentru a se vedea suprafetele de asezare.

[url=https://flic.kr/p/2kjuLFW][img]https://live.staticflickr.com/65535/50748781532_1b76e6dbb0_o.jpg[/img][/url][url=https://flic.kr/p/2kjuLFW]MVIMG_20201220_174415[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

[url=https://flic.kr/p/2kjuLEZ][img]https://live.staticflickr.com/65535/50748781477_106145c8a3_o.jpg[/img][/url][url=https://flic.kr/p/2kjuLEZ]IMG_20201220_175016[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

[url=https://flic.kr/p/2kjugiM][img]https://live.staticflickr.com/65535/50748682691_faa61505d4_o.jpg[/img][/url][url=https://flic.kr/p/2kjugiM]MVIMG_20201220_175216[/url] by [url=https://www.flickr.com/photos/21287187@N04/]bcristian[/url], on Flickr

 

asd

 

Editat Decembrie 23, 2020 de bcristian