Check it out, my fineline automation FLA-200 (2x4) machine used to cut perfect circles, but suddenly it does this:
Is that the product of backlash? How would I determine the exact source of the problem?
Thanks!
Check it out, my fineline automation FLA-200 (2x4) machine used to cut perfect circles, but suddenly it does this:
Is that the product of backlash? How would I determine the exact source of the problem?
Thanks!
According to Ahren of cncrouterparts.com, if I'm using the original one piece acme nuts, that could be the problem. I replaced the original acme nut on the z axis a while back, so I'm going to do that with the one that moves the z along the gantry. That'll be fun, taking off the z, replacing the part and then putting it back together. Hopefully that will fix it.
And that wasn't it. I installed the dumpster acme nut and it's still doing the exact same thing. I don't believe it's the G-code as it looks fine in Mach3, so it has to be the hardware, right?
I've uploaded the g-code and aspire file here: http://www.mattclara.com/misc/aspire...te-channel.zip in case anyone wants to take a look anyway.
Looks like backlash. Check for loose couplers.
Gerry
UCCNC 2017 Screenset
http://www.thecncwoodworker.com/2017.html
Mach3 2010 Screenset
http://www.thecncwoodworker.com/2010.html
JointCAM - CNC Dovetails & Box Joints
http://www.g-forcecnc.com/jointcam.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Fun problems i discovered with my FLA100 and how i handle them:
The 2 allen screws that hold the X acme nut to the gantry, first off, isnt perfectly level. I had to shim the hell out of mine to get it close.
Second, those 2 hex nuts come loose. id shim it and tighten down and maybe even add some LocTite.
Also those goofy bearing blocks on the x and y, but especially the x, come loose VERY easily. Or i should say out of alignment.
I added a bit of loctite after disconnecting the whole YZ gantry from the X bearing blocks. Packed 2x4s under the machine to hold it up. Used C clamps to hold the bearing blocks tight against the machine, but, not TOO tight. Just enough so that all 6 bearings were making contact. Adjusted my set screws carefully, but quickly as i had loctite in.
So far its improved a bunch. I havent had to redo the bearing blocks once.
BUT! Junk does get into those x bearings. Even with my dust collector. Im constantly making sure nothing gets in those blocks. I recently tried to cut some alu on it and i notice that stuff is stuck on the surface of the bearings good. Probably going to have to pull all the bearings off and give them a good cleaning.
Lastly. I had a circle/arc issue with my first board, the HobbyCNC board. Man when i went to a Gecko i couldnt believe the improvement. It was like a totally different machine.
Now on top of all this, whats your PSU?
I have one of the 36V switching supplies. I can hear it when its first started and i do a jog, that the current will spike/drop, and this is after its ramped up to velocity. Temperature affects this thing bad. I'm looking to put together a good torroid PSU. Just need to find the caps.
Now, after actually looking at the 2x4 and seeing its a dual x motor design:
I hadve buddy who had issues because his limit switches werent 100% aligned on the x. he has a rack and pinion design. Spent an evening measuring backlash/difference and shimming each side of the X. Any latency issues in your I/O will contribute to this as well.