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

[Davek0974]

Points noted Boyan, BTW the coolant is working nicely - the cutter was clear even during the heavy cuts.

Jazz, the two screws in the small cutouts - they would be fitted after the finish pass on this features?

Spoilboard - MDF?
What sort/size for facing cutters?

[JAZZCNC]

Points noted Boyan, BTW the coolant is working nicely - the cutter was clear even during the heavy cuts.

Jazz, the two screws in the small cutouts - they would be fitted after the finish pass on this features?

Spoilboard - MDF?
What sort/size for facing cutters?

Yes screws with washers in cut outs after finish pass on pockets.

MDF, ply anything that can screw into really.

Facing cutter then widest you have but with such small piece then wouldn't take long if small.

[JAZZCNC]

Actually to be honest dave if spoil board is resonably flat then just for this job won't even need surfacing because your only profiling. The main reason I said surface is because 0.3mm isn't much so can easily cut thru if not flat but if you want to have thicker skin then don't bother with surfacing.

[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.