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== Upgrade == I'd like to upgrade the maxnc. Right now its a bit sloppy. I want to (1) fix it up, (2) make a locating system for two-sided PCBs, (3) make a sweet document with tons of pictures so its easy. -moo Hey moo, who are you? The mill seems plenty accurate for our purposes, are you finding it isn't? (though a pcb jig would be sweet). I think someone bent the X spindle through misuse, if we fix anything let's fix that... [[User:Jtfoote|Jtfoote]] 05:37, 13 May 2010 (UTC) I recently stopped by and was told that the CNC was dead, or at least not working right, so I took it upon myself to dismantle the motor and spindle, re-oil everything, fix the belt tension, etc. It mills aluminum just fine now, as long as you don't try to take too heavy of a cut. I'm going to start working on a PCB mount system as well. - cole Guys, I'd like to start using MaxNC for making PCB now, but I didn't see any PCB mount system around here. Are you guys still hanging out here? [[User:Azureviolin | Hao]] 16:09, 9 June 2012 === host pc upgrading notes === [[User:Azureviolin | Hao]] just made MaxNC work with a dell latitude laptop (thanks Carlos for the donation of this laptop) on LinuxCNC 2.5, Ubuntu 10.04 Lucid, so he is planning to upgrade the desktop pc which was hosting the MaxNC machine before. Here's two problem Hao met when he use LinuxCNC 2.5 with MaxNC ------------------------ 2. emc2 doesn't run - missing lapic This happens most usually on Ubuntu 10.04 LTS + emc2. Error messages like this: .... Realtime system did not load .... Debug file information: insmod: error inserting '/usr/realtime-2.6.32-122-rtai/modules/rtai_hal.ko': -1 Operation not permitted Additional the following lines are found in dmesg: .... [ 0.000000] Local APIC disabled by BIOS -- you can enable it with "lapic" .... [ 54.798391] RTAI[hal]: ERROR, LOCAL APIC CONFIGURED BUT NOT AVAILABLE/ENABLED. This means your computer has a Local APIC, but it is not enabled. RTAI however expects it to be present and enabled to be able to work. You can force it to on by editing: in /etc/default/grub, change GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash lapic" afterwards run "sudo update-grub" and restart. 1.1. emc.nml changes For configurations that have not customized emc.nml, remove the inifile line NML_FILE = emc.nml. This will cause the most up to date version of emc.nml to be used. For configurations that have customized emc.nml, a change similar to this one is required. Failure to do this can cause an error like "libnml/buffer/physmem.cc 143: PHYSMEM_HANDLE: Can't write 10748 bytes at offset 60 from buffer of size 10208." -------------------------------------------------- 12:21 PM, 5 Aug 2012 === Ideas for maxnc accuracy improvement === In order of utility and least cost * tear-down + lube, wax x-y interface * inspect replace x-axis gib * replace set-screws, with hex cap with nut to lock down * x-axis motor mount (stiffer) * do swivel ball bearing set screws. (make sense with a gib? ) (anyways grease + locktite) * add bearings at ends of lead-screws to stabilie (original MaxNC has these... ) * z-motor mount (plans at http://www.timeguy.com) * spindle replacement === dual layer PCB fixture & locating system === ''' Part 1 ''' work plate for prepared pcbs (i.e. has holes for locating) * make pin indexed work plate that attaches with t-nuts (no need to drill holes in the maxnc) * add large dowel pins for indexing PCBs with pre drilled holes. * release pockets to scoop under pcb ''' part 2 prep work-plate''' * something sacrificial with indexing corner, to drill holes in PCBs needed to locate in dowel pins above * Face mill both to get '''flat surface'''. This could make it really easy to get good dual sided pcbs. Process would be: # load prep pate, clamp down pcb in corner # home # run pre-written g-code # swap plates # home. # Place pcb in dowel pins, glue, mill side 1 # Flip pcb (release, reglue) # Mill side 2 # Remove, release CA glue with acetone ------------------------ UPDATE: 4/25/14 Machinist from 23b Shop checked out the mill. Settings have been tweaked, worlds have been reversed. X and Y axis flipped, .INI file adjusted to allow for a higher MAX_VELOCITY (15 IPM now, up from 6, not sure the original control hardware can do much more than that) Seems like the mill prefers to have all the XY coordinates in the positive quadrant in relation to the G54 origin. Simplified G code worked just fine Gibs on the Y axis need adjustment, no limit switches or end stops are installed at the moment, so use the mill with extreme caution. two sample programs exist in the nc_code folder, noise.txt and nyan.txt, both will run on a 3.5" tall, 4.5" wide piece of stock, with the origin at the front left corner. Use a 1/8" engraving bit. ------------------------ [[Category:Pages with a Noisebridge Tiny URL]]
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