Electronics for New Machine + Chinese Spindle + VFD

**JAZZCNC** · 09-12-2015

Fingers.!!!. . .Then under wear.. .

**mturneruk** · 09-12-2015

lol. Cheers Chaps. I assume you have never done it then...

**njhussey** · 10-12-2015

I've jogged the Z axis into the frame sides slowly and caused the drives to fault but never (yet...) full on crashed it. Slapped the "OH SHITTTTTT" button a few times after forgetting to re-zero and the machine's taken off in an unexpected direction....

**JAZZCNC** · 10-12-2015

Originally Posted by mturneruk

lol. Cheers Chaps. I assume you have never done it then...

Many many times. My old machine used long timing belt which were uncovered this grabbed my shirt and half ripped it from my back before de-railing it's self. Even the Oh Shite button wasn't saving me that day because I couldn't reach it.!! . . . Now all my machines have several Oh shite buttons dotted around.!!

DONT Under estimate the power of steppers when connected to ballscrews. They will happily crush or rip your hand off just has easy they cut thru metal.!!

**cropwell** · 10-12-2015

Originally Posted by JAZZCNC

Fingers.!!!. . .Then under wear.. .

Two fingers and knickers to you !

**njhussey** · 22-12-2015

Martin, its looking good...you'll love making bits with that. Will be interested to see what you plan for machine build number 2 ;)

Are you putting any sort of dust/chip extraction in? One thing I've found is that dust and chips goes everywhere and I mean everywhere!

**JoeHarris** · 08-01-2016

good start to the year! Well done Martin!

**mturneruk** · 12-01-2016

Just had my first oh shit emergency stop.

For some reason during a multipass cut of 18mm Birch plywood, the machine lost about 10mm in the Y direction during pass number 4.
I was cutting 4mm passes at about 1500 mm / per min.

As i was towards the end of the cut the cutter was already 16mm into the wood, so when the Y lost 10mm the cutter started to plow into the full depth plywood.

After slamming the Estop. I jogged the machine back to what should of been the Zero start point but the Y was 10mm behind where i started. The gantry still seemed square.

It buggered up my very nice piece of ply, but Jazzes Estop circuit worked perfectly! Anyone got any ideas what might of happened?.
I thought i set a fairly conservative feed rate / multipass depth to be honest.

Thanks
Martin

**mturneruk** · 12-01-2016

I just ran it again at a slower feedrate and it completed ok. Not happy though. Would love to understand what happened.

Also I noticed that when I was surfacing my table the other day (using Jog), every now and again the jog would stop while I still had my hand on the key.
However no reason was given as to why by Mach3. No limit switches tripped etc. I had to reset the machine before i could continue. This must of happened 10 times during my table surfacing.

Do you think this could be down to Noise ?
Anyone got any suggestions ?

Thanks Martin

**JAZZCNC** · 12-01-2016

Originally Posted by mturneruk

Do you think this could be down to Noise ?
Anyone got any suggestions

Nope it's dodgy keyboard happens often. Change keyboard at try it again think you'll find it's ok.

The losing position could be number of things.? Most common is slipping coupler or pulley. Mark them and keep an eye to see if move.

Could be you have over tuned the motors and it's losing steps on rapid moves between positional moves.? What Velocity and Accel do you have set for each Axis.?