#garfield Logs

Jul 10 2023

12:00 AM rue_mohr: Tom_L, for the db25 connector
12:12 AM rue_mohr: "Standard Density: 5A"
12:12 AM rue_mohr: I'll say I'm ok for 2.5A, but as oxides build up, we will see
06:25 AM polprog: im officially an engineer now
07:11 AM rue_mohr: congrads, remember to go back and review everything you design after its been in the field for a while
07:36 AM rue_mohr: Tom_L, so, 5A...
07:37 AM rue_mohr: do we beleive it?
08:39 AM aandrew: polprog: congrats :-)
11:42 AM Tom_L: i wouldn't
11:43 AM Tom_L: just depends how bad you want to rewire it later
02:40 PM polprog: thanks aandrew ^^
06:39 PM rue_mohr: 2.5A motors and a 5A connector IS 200%...
06:39 PM rue_mohr: tho, if the connection starts to go bad the constatnt current driver will see it deteriorate pretty fast
06:40 PM rue_mohr: tho, if the connection starts to go bad the constatnt current driver will see that it deteriorates pretty fast
06:42 PM Tom_L: still goin for it ehh
06:43 PM rue_mohr: well, right now its a db15 and a db9
06:43 PM rue_mohr: if I change to db25, its just a sideways motion
06:43 PM rue_mohr: and I need to change out the wire at SOME point anyhow
06:44 PM rue_mohr: its like telephone connectors being rated for 1A
06:45 PM rue_mohr: sure, when their new and never been used, sure, but later? no
06:49 PM rue_shop3: but I'm missing a pendant controller
06:50 PM rue_shop3: I have to build that
07:18 PM rue_mohr: I suppose, because the limit switches are crashable on this one, I should make some kinda stop for the pendant controller
07:20 PM rue_shop3: I need to work out where I put the schematics
07:20 PM rue_shop3: not sure how I did the current limit
07:20 PM rue_shop3: pretty sure I used a LM317
07:28 PM rue_shop3: ok, ported it from atmega328, to atmega8
07:28 PM rue_shop3: that took 30 seconds
07:29 PM rue_shop3: took 9% of a m328, takes 33% of a atmega8 :]
07:30 PM Tom_L: :)
07:34 PM rue_shop3: 23% when I remove the duplicate functions....
07:34 PM rue_shop3: !?!?!
07:35 PM rue_shop3: there is an intersting catch here
07:35 PM rue_shop3: so, the machine, as wired, as all the +lim and -lim wired togethor
07:35 PM rue_shop3: that is to say
07:36 PM rue_shop3: +x +y +z are one contact -x -y -z are another
07:36 PM rue_shop3: its all taken down to +lim and -lim signals
07:36 PM rue_shop3: grbl "does it wrong" and does +-X +-Y and +-Z
07:37 PM rue_shop3: so, it doesn't know what end it hit, just which axis
07:37 PM rue_shop3: huh, further issue
07:37 PM rue_shop3: I think its meant for converted machines that still have handles
07:38 PM rue_shop3: if you hit a limit, it would EM stop, and you would back it off manually
07:38 PM rue_shop3: but with the pendant, I cant just not move if the user is on an endstop
07:38 PM rue_shop3: I manually hit the stops a LOT
07:38 PM rue_shop3: but on the sherline the motor just skips and life goes on
07:39 PM rue_shop3: Tom_L, how do the limit switches work on yours?
07:39 PM rue_shop3: are they individual or grouped?
07:39 PM rue_shop3: you dont home before each job?
07:39 PM rue_shop3: do you have + and - limits or just -?
08:25 PM Tom_L: each one has it's own io
08:26 PM Tom_L: yes i home each time
08:26 PM Tom_L: my home touches the switch then backs off slow .050" or so
08:27 PM Tom_L: i did put hard limits on as a safety precaution in case a switch failed it wouldn't run off the end of the rail
08:28 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Assembly/X_Axis_endplate.jpg
08:30 PM Tom_L: in the config:
08:30 PM Tom_L: HOME = 0.000
08:30 PM Tom_L: HOME_OFFSET = 0.050
08:30 PM Tom_L: HOME_SEARCH_VEL = 2.50
08:31 PM Tom_L: HOME_LATCH_VEL = -0.20
08:31 PM Tom_L: notice the last one is negative
09:20 PM rue_mohr: almost done reverse engineering my pendant system
09:20 PM rue_mohr: from what I can tell, I never made schematis
10:10 PM Tom_itx: what sort of io do you have on the pendant?
10:18 PM rue_shop3: the pendant itself it just a screen and keyboard, it sends key up/down events and writes the incomming data to the screen
10:18 PM Tom_itx: btw, NO in a chain is a bad idea
10:19 PM Tom_itx: 2 out of 3 wouldn't trigger anything
10:19 PM rue_shop3: there is a "step interceptor" board that uses it to interrupt the step/dir pulses via commands from the pendant
10:19 PM Tom_itx: do you have an MPG on it?
10:19 PM rue_shop3: Tom_itx, the limits are parallel any one closes to bring the limit line low
10:19 PM rue_shop3: mpg?
10:20 PM Tom_itx: i was just looking at a diagram that did series switches... how dumb
10:20 PM Tom_itx: Manual Pulse Generator
10:20 PM rue_shop3: oh
10:20 PM rue_shop3: the encoder on the pendant sends "+" and "-" on each step
10:20 PM Tom_itx: https://cnc4pc.com/mpg5-60mm-rotary-manual-pulse-generator.html?srsltid=ASuE1wSi18p6L9kVnNGyUN4RLFN7AKqYQpWhBxHzeYnuoJ3hAtQObZUJNzo
10:20 PM rue_shop3: depending on direction
10:21 PM Tom_itx: or such
10:21 PM Tom_itx: first example i found
10:21 PM rue_shop3: $36!?
10:21 PM rue_shop3: I use a cdrom motor and the ADC
10:21 PM rue_shop3: ~$free
10:21 PM Tom_itx: adafruit has them now
10:21 PM rue_shop3: I did, once upon a time buy one, but its too big
10:22 PM rue_shop3: the cdrom motor works awesome
10:22 PM rue_shop3: for the current limiter to the pendant I need a 9.1R resistor...
10:22 PM rue_shop3: havin troubles
10:24 PM Tom_itx: https://www.adafruit.com/product/5735
10:24 PM Tom_itx: those are all about the same
10:24 PM Tom_itx is now known as Tom_L
10:25 PM Tom_L: that's about the going price for those
10:26 PM Tom_L: you're not using your home made interpreter on this one are you?
10:26 PM rue_shop3: :( no
10:26 PM rue_shop3: an actual cdrom motor
10:26 PM rue_shop3: like the dc one
10:27 PM Tom_L: no i mean gcode
10:27 PM rue_shop3: hold on, ask again, there was a horrid topic mixup
10:28 PM rue_shop3: I'm using grbl...
10:28 PM rue_shop3: grbl goes to the step interceptor for the pendant, then to the motor drivers
10:28 PM Tom_L: my mind wanders more now
10:29 PM rue_shop3: you can hit "stop" on the pendant and it'll disconnect the step/dir lines between grbl and the motor driver
10:29 PM Tom_L: they don't have an enable signal?
10:29 PM rue_shop3: the interceptor has 3 modes, CNC-pass-thru, pendant control, or disconnected.
10:30 PM rue_shop3: they do, but I use a 3 state buffer as part of the signal routing
10:30 PM rue_shop3: maybe I can come visit, I get a LOT of vaccation time at this job
10:31 PM rue_shop3: we think I have 2 weeks right now
10:31 PM Tom_L: heh
10:31 PM rue_shop3: I dont know how long it would take to come down and back
10:31 PM Tom_L: i haven't been in the mindset to do much of anything lately
10:31 PM rue_shop3: ... takes a year to get a passort :/
10:31 PM Tom_L: ???
10:31 PM rue_shop3: sometimes its just like that tho
10:31 PM Tom_L: i got one in 2-3 weeks
10:31 PM rue_shop3: yea, we have a lot of hoops here
10:32 PM aandrew: rue_shop3: not necessarily. we were given huge timelines too but then got ours in like 3 weeks
10:32 PM rue_shop3: I'm sure it was stupid last time
10:32 PM Tom_L: good for 10 yrs
10:32 PM aandrew: do you have a recent-ish one or none at all?
10:32 PM rue_shop3: THAT flew by
10:32 PM rue_shop3: it expired before I got to renewing it
10:32 PM Tom_L: he had one when he went to Au
10:32 PM rue_shop3: yep
10:32 PM Tom_L: that was ages ago
10:33 PM rue_shop3: the usa also scares the hell out of me aka getting shot etc
10:33 PM Tom_L: i'm still here
10:33 PM rue_shop3: yea
10:35 PM Tom_L: i've been a few places here and there are a few i wouldn't spend any time in
10:35 PM aandrew: the US is not that bad. you don't walk around downtown vancouver because you know you're gonna step on a needle and get mugged. same with the bad areas of the US. lovely place, lovely people, don't be dumb really
10:35 PM Tom_L: down where kat was is kinda questionable
10:36 PM aandrew: my son who went to yellowknife is back home
10:36 PM Tom_L: the problem with travel is you don't really know where the good/bad places are
10:36 PM aandrew: couldn't take it up there, haven't really got a good answer from him yet, kind of concerned he got threatened or osmething and doesn't want to talk about it
10:36 PM Tom_L: i was not impressed with Miami
10:38 PM aandrew: loved the work and the team but he came back this week after only a month. he was embarrassed to tell me but we had a good talk
10:38 PM Tom_L: where is yellowknife?
10:39 PM aandrew: northwest territories, up by anchorage
10:40 PM Tom_L: ahh right in the middle
10:44 PM rue_shop3: _NO_ 9.1 ohm resistors
10:44 PM rue_shop3: I wonder if I can use 10ohms
10:46 PM Tom_L: why not?
10:51 PM rue_mohr: I have no idea how I engineered it
10:51 PM Tom_L: cause you didn't write it down
10:52 PM rue_mohr: the short answer is that its ok to go a direction, either up or down
10:52 PM rue_mohr: and my mind is working with me to know which way I can go
10:52 PM rue_mohr: oh I probably made some goofy note somewhere
10:52 PM rue_mohr: but, do you know how many of those I make?
10:52 PM rue_mohr: like 1000/yr
10:52 PM Tom_L: it's in your book of schematics and crazy ideas
10:53 PM rue_mohr: lots of them are worthless and I get rid of them, the rest go in a file
10:53 PM rue_mohr: thats organized by cronological order of last access...
10:54 PM rue_mohr: no, I checked in that book, and the other two like it
10:59 PM Tom_L: time to invent a new one
10:59 PM rue_mohr: oh I started a book for the new cnc and another for the pendant system
11:00 PM Tom_L: ok, i'm goin to sleep
11:00 PM rue_mohr: me too
11:00 PM rue_mohr: hopefully I can finish supper before I nod off
11:01 PM rue_mohr: I think the water will be boiling soon...