Questions on using a moving gantry style mini-mill...

[JAZZCNC]

Disclaimer here .!! . . . You'll need to sort that discrepency in the Z axis if your having 0.3mm Skin so don't blame if your Z isn't fettled.!

[Davek0974]

Disclaimer here .!! . . . You'll need to sort that discrepency in the Z axis if your having 0.3mm Skin so don't blame if your Z isn't fettled.!

Thats task no1, I will re-check it with the dial indicator as i cant see how it was going too deep. I know the bed is 0.1mm out of parallel over ints 400mm length but this was too deep at the point i set the tool using my probe plate.

My thinking is that I can set a tool, set zero height using the touch-plate, command G0 Z0.00 and run the cutter over the bed without any more than a witness mark?

The only thing i can see is the steps-per being off in Mach settings.

No2 job is fit and program the new VFD for sensors vector, might help a little, should certainly sort out that odd voltage issue on the 0-10v control, maybe even the lack of power at half speed.

No3 job is to run some tests on small scraps - i seem to have plenty now ;)

While doing all that I will be resigning my parts and maybe ordering some larger sheet stock so that it can be fixed down around the edges easier.

[Davek0974]

Getting beyond a joke now :(

Being smart ;) I programmed the new VFD at work on a test motor, all went well, nice and easy.

Just about time to fit it when i got home, booted the pc up, pressed the reset button to power up the VFD/spindle and pop goes the breaker.

Reset the mcb, try again - pop.

Ok, thinking there might be another issue here i disconnected the VFD and put a plug on it and plugged in directly - pop.

Now, this is a 32A circuit and I really can't see why a small drive like this should need a slow breaker?

Obviously no time left in the week now to replace the drive, so its a case of putting the dodgy one back now and keeping my fingers crossed.

I have emailed the supplier as they were shut by the time I came in from the shop.

Things shouldn't be this damn difficult, doing my head in now ;(

[lucan07]

Busy time of day so, do you're breakers have an undervoltage trip? If so, something heavy starting up might be causing a dip sufficient to drop the breaker out!

Additional thought, VFD's generally default to a very fast ramp-up time, people never turn it down sometimes fixed just by changing the ramp up time.

[Davek0974]

Doubt it, just the bog-standard 32A MK mcb.

[Boyan Silyavski]

Same thing happened here when i was testing my belt grinder, the vfd and the 3kw motor. At the end i had to open the VFD and say "bye bye" to 6 capacitors which were connected to ground. Desoldered them and now all is allright. That with the Siemens micromaster 420. Luckily the Toshiba inverter have a button to lift the capacitors from ground in urban scenario.

To check if that's the case you just check using V meter if you have leak voltage on ground pin. Carefull!

[Davek0974]

I don't think it's earth current, the breaker is not an ELCB, just a plain MCB. The whole shop is run from an ELCB and that did not blow.

I also can't risk opening it up, it's brand new and if it will not work here, it will have to go back.