#robotics Logs

Jan 23 2022

12:52 AM Phantom: hi there, do you guys use some flexdrive cables things?
01:05 AM rue_mohr: heh
01:06 AM rue_mohr: an encodermotor could do lots better than a stepper
01:06 AM rue_mohr: but their complex to control, so everyone just uses steppers
01:06 AM rue_mohr: but that is completely different
01:07 AM rue_mohr: I cannot find any record of anyone doing armature positioning of a BRUSHED dc motor using backEMF for POSITION sensing
01:08 AM rue_mohr: there is hardly anything on speed regulation using backEMF which is normal as all hell
01:23 AM Phantom: what is also annoying is that it look like nobody made a small geared stepper
01:23 AM Phantom: they all make huuuuge gearboxes
01:25 AM Phantom: my extruder recommend a maximum of 35mm/s speed for load/unload... they also say 130 count/mm... considering that it is a 200 count stepper, that's what... 39rpm?
01:26 AM Phantom: you could easilly have a 10:1 gearing, meaning that a 10 times weaker motor can be used... nope, they use the same motor with an even bigger gearbox...
01:27 AM * Phantom is pissed about that
01:30 AM rue_mohr: oh yea, its just stupid
01:30 AM rue_mohr: nobody did any math on it
01:30 AM rue_mohr: I was quite amused about the direct drive XY
01:31 AM rue_mohr: I dont think I'v even seen an impact printer do that, they have a bit of reduction of some sort
01:36 AM Phantom: The matrix printer I had and all inkjet I opened were direct drive
01:37 AM rue_mohr: huh, I think mine all had a gear
01:37 AM Phantom: the paper path was geared
01:38 AM rue_mohr: yea, sometimes is wasn't much like 1:0.9, but usually there was a gear
01:46 AM Phantom: https://flex3drive.com/wp-content/uploads/2019/07/IMG_20190503_042329-e1565197657708.jpg
01:59 AM ns12: enleth: Are there any hackerspace/makerspace/fablab/diy-engineering channels on Libera? I guess #robotics could probably be considered one of them, but are there any others?
02:00 AM ns12: s/Libera/IRC/
02:03 AM Malvolio: there's #hackerspaces and some local space ones
02:03 AM Malvolio: can search LIST for relevant terms
02:11 AM ns12: Malvolio: Thanks for telling me about #hackerspaces. It is not listed because the channel is marked secret (+s).
02:15 AM ns12: I think it's time to update this channel's topic. The http://git.io/zrffqw link in the topic mentions Freenode.
11:48 AM rue_bed: since this is a stolen channel, its headless
11:48 AM rue_bed: er, who stole this one?
11:57 AM rue_bed: oh, hmm,
11:57 AM rue_bed: Tom_L, you were admin weren't ya?
11:57 AM rue_bed: avr is headless, k
01:20 PM -!- #robotics mode set to +o by lithium.libera.chat
04:31 PM Tom_itx is now known as Tom_L