#robotics Logs

Apr 11 2015

00:04 rue_shop3 for a machine thats only 5cm larger than the old one, it sure is big in some dimentions
00:04 peepsalot this youtube channel is pretty neat https://www.youtube.com/user/thang010146
00:11 orlock rue: what yo uwant me to measure? the diagonal?
00:12 orlock rue: sorry, family got home, i've been reading alice in wonderlandand planting a passionfruit plant
00:12 orlock (and changing boots to something i can stomp on a shovel with)
00:12 orlock Oh
00:12 orlock Found out yesterday
00:12 orlock we have a boy on the way! :)
00:12 rue_shop3 orlock, no
00:13 rue_shop3 measure the left side of any parallels
00:13 rue_shop3 they should be exactly 10cm, regardless of trace width
00:13 orlock so from left side of left face to left side of right face?
00:14 rue_shop3 ok I need to extend this synchrobelt, and the extension dosn' tneed to be toothed
00:14 orlock (so not both internal or external edges, but from onternal to external?)
00:14 rue_shop3 correct, think about this
00:14 rue_shop3 if the trace width is 4mm, the left edges would still be 10cm apart
00:15 rue_shop3 so it'll tell you your scaling is right without involving trace width error
00:15 rue_shop3 just mind where it 'splats' out on the table
00:18 orlock 101.34 external
00:18 orlock 98.40 internal
00:18 rue_shop3 NO
00:18 rue_shop3 wrong measurements
00:18 rue_shop3 left side to left side
00:18 rue_shop3 inside edge to outside edge
00:19 rue_shop3 the right side of the line of parallel lines
00:20 orlock yeah, tricky to do accuratly with my calipers
00:20 rue_shop3 if you can get it within .5mm your witin 5%
00:21 orlock 99.95
00:21 rue_shop3 if that number isn't right, its X/Y scaling error
00:21 orlock yeah my X/Y scaling is find
00:21 orlock its the extruder trace offset thats the issue
00:22 orlock my other print i was constantly off by the same amount over both dimensions too
00:22 rue_shop3 if the number is right, you know your ok, any error after that is trace width, which can be adjusted in slicers nozzel size or otherwise
00:22 rue_shop3 but we hav to be sure of the scaling before adjusting that
00:22 orlock well, assuming my nozzle size is right
00:23 rue_shop3 yes, but its wrong
00:23 rue_shop3 nozzel size != trace width
00:23 orlock the scalings simple maths based on the belt size, etc etc
00:23 rue_shop3 usually the plastic flares out after it comes out the nozzel
00:23 orlock yup
00:23 orlock yup
00:23 rue_shop3 so I lie to sclicer
00:23 orlock thats what i was looking for
00:23 orlock a way to compensate for trace width/offset
00:23 orlock ok
00:24 rue_shop3 OR play with the extruder multiplier
00:24 orlock i hate the multiplier
00:24 rue_shop3 have it fire less plastic at the head
00:24 rue_shop3 heh
00:24 orlock its a fiudge factor for variables that are better set correctly elsewhere
00:24 rue_shop3 how big is your 1.75mm filament?
00:24 orlock i've set that correctly
00:24 orlock 1.71
00:24 rue_shop3 ah
00:24 orlock tweaked esteps
00:25 orlock even reduced perimiter extrusion slightly
00:25 orlock i might try the latest version of slic3r
00:25 rue_shop3 Triffid_Hunter, has a really neat way of doing it where he throws out the length based numbers and does it by plastic volume
00:25 orlock its seems to be a meter of extrusion centering or not
00:25 orlock yeah - i dont think thats the fix
00:25 rue_shop3 if you want to know any of my settings, do ask
00:25 orlock it needs to calculate the extruded position from the perimiter inwards
00:26 orlock not down the center of the extruded line
00:26 orlock as thats giving me this constant minor extra width
00:26 orlock did you see those two images i pasted before?
00:26 orlock it was off by the same fraction of a mm X and Y
00:26 orlock when X and Y were different dimensions
00:26 orlock so thats likely to be 50% of the extruded trace width i guess
00:27 rue_shop3 holes are always out
00:27 rue_shop3 known issue
00:27 rue_shop3 debated cause
00:27 orlock if its doing the external perimiter centered rather than on the egde of the extruded line
00:27 orlock that too
00:27 rue_shop3 my holes are always out by the nozzel size, 0.5mm, I have to make them about that much larger
00:27 orlock i think it all comes down to this - and i googled it and could not find much
00:27 orlock ok, planting passionfruit now
00:41 rue_shop3 Tom_itx, were you ever an airplane mechanic?
00:51 Jak_o_Shadows crimping things with pliers is painful
01:43 rue_shop3 @!#$!@^@#$ the Y axis slipping is back!
01:43 rue_shop3 W.T.F.
01:43 rue_shop3 cant be actual slipping
01:55 Jak_o_Shadows heated bed installed
01:55 Jak_o_Shadows just gotta attach the thermistor to it, and figure out the thermistor table
02:37 Jak_o_Shadows yup, heated bed works.
03:10 rue_bed I dialed down the currents and left it to finish
03:10 rue_bed I'm suspicious of those drivers
04:57 Jak_o_Shadows heated bed made things flatter
09:23 orlock reprapper: i was told by several people it would not be a slicer issue
09:23 orlock doh
14:41 malinus I'm designing a pcb, with a lot of streight connection from A->B that are ~5cm. Does it matter if I run them on the back/gnd layer of the upper one?
17:04 Tom_itx malinus probably not