MEDICION DE CONICIDAD

ESTÁNDAR API 7-2 – DEFINICION/TOLERANCIAS/INSTRUMENTO DE MEDICION

T Taper, expressed as millimetres of diameter per millimetre of length or inches of diameter per foot

of length.

6.1.6 Taper toleranceThe taper tolerance of rotary shouldered connections shall be as follows:a) pin thread: +0,0025 mm/mm to 0 mm/mm (0.030 in/ft (1/32=0,031) to 0 in/ft) average taper between first and lastfull depth threads;b) box thread: 0 mm/mm to 0,0025 mm/mm (0 in/ft to0.030 in/ft (1/32=0,031)) average taper between first and lastfull depth threads.

Methods for determining taper are described in 8.5.

8.5 Taper measurement

8.5.1 Taper errorsFor all threads of rotary shouldered connections, taper tolerances shall be expressed in terms of millimetresper millimetre (inches per foot) of thread and taper errors shall be determined accordingly. The measurementsare made for a suitable interval of thread length and the observed errors shall be calculated to the millimetresper millimetre (inches per foot) basis.

8.5.2 Taper calipersThe taper of threads shall be measured with an instrument having an accuracy of 0,010 mm (0.0004 in) orbetter within the measurement range used.

CONOCIMETRO de interior

SI CALCULAMOS ϕ SEGUN LA TABLA DE API

/

CON ESTE VALOR DE ϕ PODEMOS CALCULAR LA VARIACION EN EL DIAMETRO DEL CONO.

DE API, SABEMOS QUE LA ROSCA TIENE 4 FILETES POR PULGADA, EN CONSECUENCIA EL ANCHO DE DE UN FILETE ESANCHO DE UN FILETE 1”/4=1/4” (6,35 mm)

INCHES INCHESEL RELOJ TIENE UNA

PRESICION DE 0,0005

0 se calibra el reloj a CERO vueltas

1 0,25 0,020690633 41,3812658 0 41,38126582 0,5 0,041381266 82,7625316 1 32,76253163 0,75 0,062071899 124,1437974 2 24,14379744 1 0,082762532 165,5250632 3 15,52506325 1,25 0,103453164 206,906329 4 6,9063296 1,5 0,124143797 248,2875948 4 48,28759487 1,75 0,14483443 289,6688606 5 39,66886068 2 0,165525063 331,0501264 6 31,0501264

CONEXIONES V-038R

Filetes

MEDICION LECTURAcon 50

divis iones x vuel ta