Buen día compañeros espero no aburrirlos con la explicación de mi problema, pero necesito una ayuda, Hace un mes termine la construcción mi CNC, esto con el fin de hacer mis propios PCB con mejor calidad. Pero desde que comencé con las pruebas de la maquia tengo algunos problemas
Problemas:
1) profundidad inestable
no logo mantener una profundidad uniforme en el corte (eje Z). Un ejemplo es que comienzo con una profundidad de -0.075 o -0.100 en el eje z, coloco la punta de la broca de la fresadora que toque y pula el cobre de la placa, listo comienza a cortar con una profundidad que al ojo parece ser la correcta, luego en cierto punto ya la broca no corta el cobre de la placa si no que solo lo raya como se ve en la figura con las fechas de colores
La fecha verde con los cuadros negros, indica que la maquina esta cortando, pero llega un momento donde el eje Z se levanta, bueno eso es una hipótesis mía no se si es hacia.
Una de mi solución al caso fue, si la maquina esta rayando la placa en ciertos puntos cuando estoy calibrando la maquina para buscar el punto 0 entierro un poco mas el eje z para que corte mas profundo. Pero me causa otro efecto no deseado, el tallado lo hace muy profundo como señala la fecha azul y rojo, esto es tan profundo que en ciertas partes llega a cortar la placa, como muestra la figura.
NO se como solucionar este caso les agradesco su ayuda
otra cosa que pensé fue los parámetros del GRBL, modifique el 9 y el 10 para tratar de darle mayor precisión en la curvas pero funciono lo que logre es que el motor de eje z tome temperatura.
Agrego el código g que inserto en el Universal gcode sender para que la maquina lo procese, si ven algo que este mal que me genere el problema Universal gcode sender
Las piezas mas importante que compones mi CNC Son
Motores (3) x y z Nema 17
12 Volteos
1,8° pasó
0,4 Amper
Link:
1~5X 28Ncm Nema 17 Stepper Motor 0.4A 1.8° 4Wire Cable For 3D printer CNC Reprap | eBay
Arduino Uno y cnc shield con controlador A4988 “bueno la versión china”HR4988
CNC Shield V3.0+ UNO R3 Board + A4988 Driver + Heatsink Kits for Arduino CNC Kit | eBay
Barras roscadas de 4 hilos o líneas y 8mm por vuelta.
https://www.amazon.com/CTYRZCH-L300...28&sr=8-1-fkmr0&keywords=tornillo+8mm+4-start
Lo demás son barrar aceradas lizas con sus rodamientos
8mm 3D printer parts Reprap Chromed CNC shaft smooth Rod Round bar steel #45 | eBay
4pcs SC8UU SCS8UU 8mm Linear Ball Bearing Linear Motion Bearing Slide For CNCYU2 | eBay
Software que manejan la maquina
Inkscape
Universal gcode sender 1.0.8
Arduino 1.6.7
grbl
Existe otro punto que no es un problema pero no es tan importante, y el mismo se da con el programa Inkscape 0.91 y con la versión que le sigue
cuando uno realiza la vectorizacion de mapa, la imagen de una vez pierde definición en lo bordes
imagen antes del proceso
cuando realizo la vectorizacion de la imagen, se puede ver que los bordes cambia en ciertos puntos.
Les agradezco que me ayuden a saber en que punto del programa se le indica que no altere la imagen al vectorizar, o si existe otro que programa de licencia libre que me ayude a generar el codigo g.
Código:
%
(Header)
(Generated by gcodetools from Inkscape.)
(Using default header. To add your own header create file "header" in the output dir.)
M3
(Header end.)
G21 (All units in mm)
(Start cutting path id: path3399)
(Change tool to Cylindrical cutter)
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G02 X44.311644 Y8.255001 Z-0.100000 I0.049741 J0.601028
G02 X44.120280 Y8.624769 Z-0.100000 I0.485912 J0.485872
G02 X43.994144 Y10.107085 Z-0.100000 I8.646787 J1.482316
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G01 X44.093147 Y6.350001 Z-0.100000
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G01 X52.937060 Y6.667530 Z-0.100000
G00 Z5.000000
(End cutting path id: path3399)
(Start cutting path id: path3399)
(Change tool to Cylindrical cutter)
G00 Z5.000000
G00 X52.937060 Y6.667530
G01 Z-0.100000 F100.0(Penetrate)
G03 X53.105002 Y7.046954 Z-0.100000 I-0.406985 J0.407021 F100.000000
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G03 X53.014698 Y19.479833 Z-0.100000 I-80.190438 J0.000000
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G03 X30.894943 Y18.411369 Z-0.100000 I0.780834 J-2.476007
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G02 X17.511805 Y18.187783 Z-0.100000 I-0.801773 J1.223653
G02 X11.003790 Y17.930194 Z-0.100000 I-7.728737 J112.926133
G01 X4.438935 Y17.859396 Z-0.100000
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G03 X19.510877 Y15.976884 Z-0.100000 I0.030926 J1.133076
G02 X20.472701 Y16.298090 Z-0.100000 I1.090198 J-1.663851
G02 X25.208727 Y16.451070 Z-0.100000 I4.736025 J-73.233576
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G03 X33.023593 Y16.992446 Z-0.100000 I-1.220703 J0.982980
G02 X33.282647 Y17.550428 Z-0.100000 I2.093583 J-0.632860
G02 X33.886911 Y18.322410 Z-0.100000 I4.658709 J-3.024093
G01 X34.568147 Y19.050016 Z-0.100000
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G02 X44.120280 Y8.624769 Z-0.100000 I0.485912 J0.485872
G02 X43.994144 Y10.107085 Z-0.100000 I8.646787 J1.482316
G01 X43.994144 Y11.641668 Z-0.100000
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G01 X52.937060 Y6.667530 Z-0.100000
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(End cutting path id: path3399)
(Start cutting path id: path3399)
(Change tool to Cylindrical cutter)
G00 Z5.000000
G00 X49.021227 Y12.964613
G01 Z-0.100000 F100.0(Penetrate)
G01 X49.021227 Y14.816688 Z-0.100000 F100.000000
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G01 X45.317060 Y14.816688 Z-0.100000
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G01 X49.021227 Y11.112530 Z-0.100000
G01 X49.021227 Y12.964613 Z-0.100000
G01 X49.021227 Y12.964613 Z-0.100000
G00 Z5.000000
(End cutting path id: path3399)
(Start cutting path id: path3399)
(Change tool to Cylindrical cutter)
G00 Z5.000000
G00 X49.021227 Y12.964613
G01 Z-0.100000 F100.0(Penetrate)
G01 X49.021227 Y14.816688 Z-0.100000 F100.000000
G01 X47.169144 Y14.816688 Z-0.100000
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G01 X45.317060 Y12.964613 Z-0.100000
G01 X45.317060 Y11.112530 Z-0.100000
G01 X47.169144 Y11.112530 Z-0.100000
G01 X49.021227 Y11.112530 Z-0.100000
G01 X49.021227 Y12.964613 Z-0.100000
G01 X49.021227 Y12.964613 Z-0.100000
G00 Z5.000000
(End cutting path id: path3399)
(Start cutting path id: path3399)
(Change tool to Cylindrical cutter)
G00 Z5.000000
G00 X42.357260 Y22.820332
G01 Z-0.100000 F100.0(Penetrate)
G03 X42.004930 Y23.383582 Z-0.100000 I-0.740525 J-0.071400 F100.000000
G03 X40.951435 Y23.680230 Z-0.100000 I-1.053494 J-1.722334
G03 X39.897940 Y23.383581 Z-0.100000 I-0.000000 J-2.018979
G03 X39.545610 Y22.820332 Z-0.100000 I0.388195 J-0.634649
G01 X39.462699 Y21.960438 Z-0.100000
G01 X40.951435 Y21.960438 Z-0.100000
G01 X42.440172 Y21.960438 Z-0.100000
G01 X42.357260 Y22.820332 Z-0.100000
G01 X42.357260 Y22.820332 Z-0.100000
G00 Z5.000000
(End cutting path id: path3399)
(Start cutting path id: path3399)
(Change tool to Cylindrical cutter)
G00 Z5.000000
G00 X42.357260 Y22.820332
G01 Z-0.100000 F100.0(Penetrate)
G03 X42.004930 Y23.383582 Z-0.100000 I-0.740525 J-0.071400 F100.000000
G03 X40.951435 Y23.680230 Z-0.100000 I-1.053494 J-1.722334
G03 X39.897940 Y23.383581 Z-0.100000 I-0.000000 J-2.018979
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G01 X42.440172 Y21.960438 Z-0.100000
G01 X42.357260 Y22.820332 Z-0.100000
G01 X42.357260 Y22.820332 Z-0.100000
G00 Z5.000000
(End cutting path id: path3399)
(Footer)
M5
G00 X0.0000 Y0.0000
M2
(Using default footer. To add your own footer create file "footer" in the output dir.)
(end)
%