Messages

1

General Mach Discussion / Re: Z axis loss of cutting depth after multiple Z movements

« on: December 15, 2017, 04:39:35 PM »

Thanks for your advice. I am a long time retiree pensioner and have to watch the pennies. In looking at purchasing a new system the ethernet seems the way to go. It would seem to me that much of the systems are back in the dark ages only suitable for XP and parallel port and consequently are still reasonably priced. Have tried reducing acceleration, used new collets and double checked everything over and over again. Have also had help from a software design engineer to route out the problem. I see from Homann designs under EN-009 that I could use a MB - 026V BOB coupled to G251 Drivers. I have 4 Leadshine Drivers, power supply for the drivers and the BoB plus connectors and wiring.
This would seem to be the less expensive way to go albeit the use of XP and parallel port would be necessary.
I do not earn an income from CNC and use it to produce toys for disadvantaged children.
Is the setup on using the MB - 026V wired to Leadshine Microstep drivers a workable alternative. It seems to be a system without a motion controller.
David

2

General Mach Discussion / Z axis loss of cutting depth after multiple Z movements

« on: December 13, 2017, 11:52:35 PM »

Using Mach3 and G540. V carve cutting depth set at i.5mm.  Series of text around a 475mm dia curve. At the end of the cut the tool is 2 mm above the material. Settings are from top of material.
Tried Z setting from top and bottom of material both of which show the same problem. Table is and material are perfectly flat. Tool is tight. No back lash. slides are clean ,lubricated and are not binding.
Have also a series of intermittent stops which seem to be getting worse. Suspect the G540 Bob is the cause. Have 4 Leadshine Microstep drivers DMA860H, power supply and ample wiring.
Was thinking of ditching the G540 and buying a ethernet BOB. The prices of the Smoothstepper are clearly excessive and beyond my means. The only BOB of reasonable price is the NVEM which claims mach3 compatibility but speaking to mach support they have never tested or approved this BOB.
Can anyone shed light on the Z axis problem and if the NVEM works with Mach 3. Is there a ethernet bob of reasonable price and proven use with Mach3