#robotics Logs

Nov 11 2017

12:18 AM anonnumberanon: Tom_L, what is it?
12:21 AM Tom_L: stepper mounts for my mill
07:18 AM Luminax: yo
04:22 PM tttb2 is now known as tttb
05:37 PM Jak_o_Shadows: hi
06:56 PM sadisticroot is now known as evilroot
08:37 PM rue_shop3: and with the right inductor my zener tester power supply jumps up to 200V output
08:37 PM rue_shop3: on a 1uF capacitor, making a little voice in the back of my head say "yikes..."
08:38 PM rue_shop3: I got up to 87V on the irfz44
08:38 PM rue_shop3: as everything started smoking I realized that yea, z44, 55V
08:39 PM rue_shop3: apparently the 1N5158 dosn't like more than about 60V, not sure off the top of my head what its spec is
08:40 PM Tom_L: ur supposed to know these things as the designer
08:40 PM Tom_L: i was gonna go out and work but not sure i have it in me tonight
08:41 PM rue_shop3: I'm just hacking
08:41 PM Tom_L: i could go cut the 1/2" alum plate to size i suppose
08:42 PM rue_shop3: made up a quick pwm gen and was playing with the different inductors I have
08:42 PM rue_shop3: see what kinda voltseconds they saturate at
08:42 PM Tom_L: i gotta fix the cad model on my X axis
08:42 PM Tom_L: add the 2 risers under the slide plates
08:42 PM rue_shop3: I suggest just putzing, do things and let what things will happen, happen
08:43 PM Tom_L: gotta go out and meaure the material thickness...
08:43 PM rue_shop3: I'm gonna see if I can make a 200V constant current zener tester
08:43 PM Tom_L: then i can measure for the X axis servo mount
08:43 PM rue_shop3: iirc something like 8mA
08:43 PM Tom_L: brb..
08:43 PM * Tom_L grabs some calipers
08:52 PM * Tom_L fires up the cad machine
08:59 PM Jak_o_Shadows: I don't suppose anyone has any ideas for general getting the RTC on the stm32's working?
08:59 PM Jak_o_Shadows: it is 100% not code - the LSE is not appearing to work
09:22 PM Tom_L: rue_shop3
09:23 PM Tom_L: can you print that flexible wire conduit they use on cnc?
09:26 PM rue_shop3: the cable chain?
09:26 PM Tom_L: yeah
09:26 PM Tom_L: i may need a piece for X
09:26 PM rue_shop3: I tried some, stiff at first, and relaxes into goodness
09:26 PM rue_shop3: what size?
09:26 PM Tom_L: no idea
09:27 PM Tom_L: 4 wire stepper bundle and 2 wire limit switch
09:27 PM Tom_L: small ish
09:28 PM Tom_itx: https://www.thingiverse.com/thing:1448260
09:28 PM Tom_L: something like that
09:28 PM rue_shop3: yup
09:28 PM rue_shop3: I did some
09:29 PM Tom_L: does it have separate end pieces to bolt to something?
09:29 PM rue_shop3: yes
09:31 PM Tom_L: how does pla hold up to chems?
09:31 PM Tom_L: like oil etc
09:38 PM Tom_L: https://www.amazon.com/dp/B01LXHACW5/ref=asc_df_B01LXHACW55260697/?tag=hyprod-20&creative=395033&creativeASIN=B01LXHACW5&linkCode=df0&hvadid=198090317965&hvpos=1o4&hvnetw=g&hvrand=13490392362647780249&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9024248&hvtargid=pla-350679867265
09:39 PM Tom_L: i don't think you could print it and ship it for that
09:41 PM Jak_o_Shadows: What's shipping like, in general, in canda?
09:41 PM Jak_o_Shadows: In aus it's a minimum of 8, unless you can fit it in a normal envelope
11:05 PM rue_shop3: there is no price limit to shipping
11:05 PM rue_shop3: you can pay $100 to have a 1kg package shipped to your nextdoor neighbour and still have it show up in 7 weeks
11:18 PM Tom_L: ok, updated the cad model
11:18 PM Tom_L: mounted X stepper and updated shims for screw to screw mount surfaces
11:19 PM Tom_L: still don't know if i wanna flip Z stepper and direct drive it
11:19 PM Tom_L: or use a belt with some reduction
11:20 PM Tom_L: guess i can start out direct and see how it does
11:21 PM rue_shop3: heh, playing with my current limited 200Vdc supply
11:22 PM rue_shop3: whats the ball pitch?
11:25 PM rue_shop3: hmm pwm generator, comparitor, reference..... or... just use a tiny13...
11:27 PM rue_shop3: uh
11:27 PM rue_shop3: only uses 2 pins of a t13
11:28 PM rue_shop3: one for current feedback, one for pwm out
11:28 PM rue_shop3: huh
11:28 PM rue_shop3: ... and then allll.. these components get removed
11:28 PM rue_shop3: ...
11:28 PM rue_shop3: damn...
11:32 PM Tom_L: 5mm
11:32 PM Tom_L: pitch
11:32 PM Tom_L: 16mm shaft
11:33 PM rue_shop3: 5mm
11:33 PM rue_shop3: 0.025mm/step
11:33 PM Tom_L: so about 4x what i've got now
11:33 PM rue_shop3: .98thou
11:33 PM rue_shop3: (then you consider mircostepping)
11:33 PM rue_shop3: ...
11:34 PM Tom_L: 10
11:34 PM rue_shop3: .098thou
11:34 PM rue_shop3: +-
11:34 PM Tom_L: .098" or .0098" ?
11:34 PM rue_shop3: .098
11:34 PM rue_shop3: thou
11:34 PM Tom_L: per step?
11:35 PM rue_shop3: per microstep
11:35 PM Tom_L: that's not very good
11:35 PM rue_shop3: .98 per step
11:35 PM rue_shop3: .098thou / microstep?
11:35 PM Tom_L: that's ninety thousandths per
11:35 PM rue_shop3: 10.2 microsteps per thou
11:36 PM Tom_L: or you're stating it wrong
11:36 PM Tom_L: or i'm misunderstanding what you're saying
11:36 PM rue_shop3: thou is 1/1000 of an inch
11:36 PM Tom_L: i know that
11:36 PM rue_shop3: 0.00098425197" per full step
11:36 PM Tom_L: but that's represented by: .001"
11:37 PM rue_shop3: 0.000098425197" per microstep
11:37 PM Tom_L: so that's not so bad
11:37 PM rue_shop3: " is inch
11:37 PM rue_shop3: 8-|
11:37 PM rue_shop3: you people gonna drive me INSANE ya know? INSANE!!!!!
11:37 PM Tom_L: i just wonder about the torque
11:38 PM Tom_L: since it's about 4x more screw than what i currently have
11:38 PM Tom_L: i _was_ gonna belt drive all of the axis with maybe a 3:1 ratio
11:38 PM Tom_L: for more torque
11:39 PM Tom_L: i just don't know if i need it or not