Workbee 1510 Z trip on job start

Homing sets the machine origin. You have to Setzero on stock, to tell Grbl where the STOCK is

Machine coordinates and Work coordinates are seperate. When you setzero you tell the machine where the STOCK is - it saves it as an offset from Machine position so you can go there again after rehoming. but for each new job/stock you have to set zero again where zero may be

Checkout

 

So where is the gcode from?
Any G53Z0's in the header? (make it G53Z-5 if its from our fusion post, and change the z safe height in the post process window to -5)
(and attach it here)

 

Attach the gcode please

 

Ok, no G53s

So, is your axes all jogging the right directions?
X- move endmill toward left, X+ moves endmill toward the right of the stock
Y- moves the endmill toward the front of the stock (toward you if you stand in front of machine), Y+ moves endmill toward the back of the stock (away from you)
Z- toward the spoilboard, Z+ away from the spoilboard
(if not, grbl settings > $3 Direction Invert > Flip relevant switches)

And doublecheck, you did jog to the surface of the stop and clicked Setzero - all moves (except G53 moves) are relelative to where Z0 is set

 

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Home sets machine zero (refer to gnea/grbl)
Setzero tells the machine where the stock is. In your CAM setup you have an Origin. You want to setzero on the stock, where that Origin is supposed to be.

You have to set X, Y and Z, as you'll never have the stock right up against X and Y zero (needs some negative space for endmill offsets etc)

Its either machine setup, or CAM setup. Lets make it easy: Run the Hello World



And video it - we know what moves to expect, so if it misbehaves, we can know why.

Rather than the unknown if its supposed to work Cut2d output

 

Usually thats down? Home lifts endmill all the way up, so you jog downward toward to top of the stock (which is on the spoilboard, below the endmill)

 

Yeah but thats not normal

Do post the file though (screenshot not so useful, i cant load and run it lol)

And do try the hello world, should at very least give you some satisfaction that the setup works, and then you just got to figure out Cut2D's specifics

 

finally got the 27Mb video downloaded. I only have a 4mb line at home and its flaky as can be!)
Fishy looks good, so yeah, do post the Gcode file, let me see if it does the same z moves at the beginning when I run it here?

 

Until you do that, I can't tell you what in your gcode is wrong (;

The picture looks like either too an aggresive cut recipe, or something is loose (backlash) - hold the endmill by hand and give it a firm wiggle. If it gives, follow the wiggle until you find what loose.
Likely candidates
- loose wheel or incorrectly adjusted eccentrics
- loose coupler between motor and leadscrew or motor and pulley (if its a belt machine)
- loose stop collars on leadscrew