Off Center

[pappybaynes]

I'll attempt to attach some photos - you will see that the stained coaster which was a sample for the customer looks pretty good...as opposed to the other picture which shows the rope board uneven in width, the vcarved letters and anchor are very shaky. The only thing done between the sample and the others is that i finally replaced my sacrificial board with a new one, and milled it flat...the sample was done as a single and the others are 4 on a board. Help!

[gc3]

looks like blank might have moved also i would use spiral ramp for cut out

[steve_g]

The anchors look like mine did when I had a setscrew loose on a pinion gear…
SG

[pappybaynes]

The anchors look like mine did when I had a setscrew loose on a pinion gear…
SG

Yep, that was it! 2 out of 3 where loose! Thank you!
Dick

[pappybaynes]

just to be sure all was well, I did a sample and found it still to be a bit out of round...I did cut a circle - simply a cc 2" circle. Open to suggestions...

[pappybaynes]

Just to be sure, I pulled all the motors except the Z motor and checked lock screws on pinions...all tight...checked rollers, Z carriage, collets etc then put a board on the table and did a cut circle, 3" and a cut rectangle 3" sq - the circle is off and the square is dead on?????????

[steve_g]

Dick…
I’m curious what bit and speeds your using… Ramping would cause the gantry to slow down in the corners of the square and bit deflection might show more on a circle… (Grasping at straws here!)
SG

[gc3]

ck photo 2...center left side... can clearly see deflection

[pappybaynes]

Roughing cut for rope - 0.125 tapered BN feed is 0.83 inches / sec @ 13.8 K rpm
Finish cut - 0.0625 tapered BN Feed is same as above
Pocket cut on inside of rope - 0.25 upcut 1.67 in / sec @ 10K rpm
V-carve name 60 deg - 1.67 in / sec @12 K rpm
Anchors - 60 deg profile cut - 1.67 in / sec @12 K rpm
Cut Out - 0.25 upcut 1.67 in / sec @ 10K rpm

These are the same bits, feeds and speeds are what I did on the first piece that I did for customer approval...

[shilala]

That's a mess.
I'm sure you probably thought of it, but I'd reset the machine, reboot, and maybe even clean out and reinstall sb3. The reason I say this is because it looks like there's some really weird communication going on, and it look very constant.
Consider changing your usb port, as well.
That's grasping, but it's where I'd start based on what you said about it going wonky all at once. I'd try another file that's not that one, too. Make something totally unrelated and see what the machine is doing.
I'd also grab the bottom end of your spindle and see if there's any play at all. Power the mavhine down and run the gantry back and forth, left and right, and your z up and down by hand and see if you feel anything other than a nice, fluid movement.
At least this way you'll get the obvious stuff out of the way.
Make sure the usb cable didn't get knicked or pinched or mouse chewed. I'd probably change it out after checking all this other stuff.