Messages

1

General Mach Discussion / Re: pockets out of size, need help

« on: April 17, 2011, 12:52:10 AM »

Jeff, Gerry :
thanks for your reply, but no, the cutter diameter is 3/16" it has a micro waste after about 2000 pockets, also I changed the tool for new one... and Gerry, yes in the past I get many pockets whit exact size, the sizes of my pockets are: 5mm, 8mm, 15mm, 20mm and 34mm. in diameter, today I checked again the axis calibration ( X and Y) and the most exact aproximation was about .0005" (checked with a Starret dial indicator). the tool is a spiral 2 flutes from Onsrud.
Also, Today I make some trials doing profile circles with zero tool compensation and results were excelent (using a V tool 30 deg. 0.05mm depth). diameters were exact.
I have the feeling the trouble comes from the configuration of my Mach3.
but I can not find where do I can make the changes.
Thanks again and expecting your news...
yours Eduardo

2

General Mach Discussion / pockets out of size, need help

« on: April 16, 2011, 01:09:48 AM »

after review all parameters on my machine: (motor tuning, displacement precision in X and Y axes and execute the axis calibration), and review the G code generated from my Cad-Cam program (BobCad V24), I have this problem: all pockets are undersize in diameter (not in depht), the Gcode created starts with following instructions:
line N1  G21 G40 G49 G54 G80 G90 G91.1 G53 Z0...

the line which indicate the start position for the controlled point as sample: (for a pocket with 15mm diameter 12.7mm depth, with center coordinates X=25mm, Y=100mm, tool diameter 4.7625mm (3/16"), as I calculate the point x=30.118 and y=100. has to generate a exact 15mm diameter hole:

 N11 X30.118 Y100.
N12 G01 Z-12.7 F2540.
N13 G03 X30.118 Y100. I-5.118 J0. F2135.
(the machined pocket has 14.2mm diameter.)
what can I do or change in the configuration in Mach???
thanks in advance. Eduardo

3

FAQs / Re: Losing steps or something?

« on: September 24, 2010, 10:15:17 PM »

Hi I am new in this world (CNC), few days ago, I launch my first works, after I configured Mach3, following word by word the instructions from the manual, when I ran the first job (my companies logo) just using a pencil (after I did all tests and checked de precision of movements and positions) I saw with deception, my machine after 1200 lines, goes erratic in positions, while the screen wich follows the tool path was correct.... in this way I tought, it is not troble from the software, it is probably concerned to the tuning of motors or a mechanical problem... it was both... some pieces of garbage on the leadscrews, and the values of speed and acceleration in motor tuning... well, after many changes and tests, reducing speed and increasing acceleration, finally, the machine is runing  ok.
I think your problem is similar, I Hope the solution be in the same way..

4

Spanish / Re: Nuevo que empieza su CNC...

« on: September 24, 2010, 09:36:40 PM »

hola, para empezar, los trabajos que pretendes (materiales por trabajar) no representan el requerir de una maquina que desarrolle una gran fuerza (torque de motores), hay paquetes que incluyen drivers, motores, fuentes de poder e incluso mach3 con licencia, la clave esta en que la definición de los trabajos que vas a realizar por ejemplo: grabados, v-carving y otros similares, son proporcionalmente ligeros y con motores por ejemplo de 170 oz-in, podras desarrollarlos a la perfección, si requieres de hacer corte profundo, como, cortar un tablero de aglomerado o maderas duras, lo podras realizar, pero por el bajo torque de los motores, tendrás que realizarlo en muchos pasos...asimismo, la rigidez de la maquina, a trabajos que requieran de mayor esfuerzo, más rigida tendra que ser la maquina, asi como de utilizar motores de mayor torque.
saludos.

5

Spanish / Re: El mach3 me corta pero no respeta las medidas

« on: September 24, 2010, 09:20:51 PM »

hola, soy nuevo en esto, en eje z, en mi caso, he determinado que el torque de mis motores es muy bajo, y estoy intentando con un router aparentemente muy pesado  (5 kg aprox), cuando que, estos motores estan hechos para hobby y por ende para routers muy pequeños (mototools)solucion: poner un contrapeso para contarrrestar el peso del router