#garfield Logs

Oct 19 2022

04:25 AM Tom_L: morning
04:35 AM rue_mohr: already?
04:35 AM rue_mohr: wait, you said, 2am
04:35 AM rue_mohr: your late
04:35 AM rue_mohr: I'm wrapping up, just started cooking supper
04:37 AM Tom_L: this was just #2 time up
04:38 AM Tom_L: first time i saw you working so feverishly i didn't wanna disturb ya
04:55 AM rue_mohr: would you be into a press punch die project for someone?
04:56 AM rue_mohr: for a db9 hole
05:08 AM rue_mohr: https://twitter.com/davidareader/status/1582670049231327233/photo/1
05:09 AM rue_mohr: "Haven't seen any of the D connector types for ages.
05:09 AM rue_mohr: ..and I'm not spending £180 a set for the basic round and rectangle punches..
05:09 AM rue_mohr: the decimal point is in the wrong place!!"
05:47 AM rue_mohr: ok, well, I finished supper, I should get some sleep
05:47 AM rue_mohr: almost 4am
05:48 AM rue_mohr: tom, do you have a source of ~51 thou tempered brass up there?
05:48 AM rue_mohr: down there?
05:48 AM rue_mohr: whatever
06:45 AM Tom_L: dunno what that is
12:56 PM rue_mohr: there is a utility key that they stopped making
02:04 PM rue_mohr: ok, where is my todo list
05:32 PM Tom_L: ok
05:32 PM Tom_L: key for what?
05:33 PM * Tom_L googles "utility key that they stopped making"
05:36 PM Tom_L: https://www.ebay.com/itm/255610976883
05:36 PM Tom_L: probably not that
05:38 PM Tom_L: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQX8Vze7RdFfY8WpzT_L9G0fr8oL4Sg1zP7nZERnzF4Vw&s
05:38 PM Tom_L: probably not that
05:44 PM Tom_L: brass sheet... shim stock
05:44 PM Tom_L: mcmaster etc
05:44 PM Tom_L: naval brass?
05:45 PM Tom_L: https://www.acmetals.com/product/464-naval-brass-sheet/
05:46 PM Tom_L: https://www.acmetals.com/product/260-brass-hard-temper-sheet/
05:46 PM Tom_L: hard temper
05:46 PM Tom_L: not .051
05:56 PM Tom_L: Some of the common types of brass available include:
05:56 PM Tom_L: Red brass
05:56 PM Tom_L: Yellow brass
05:56 PM Tom_L: 330 brass
05:56 PM Tom_L: 360 brass
05:56 PM Tom_L: 464 brass
05:56 PM Tom_L: https://www.sequoia-brass-copper.com/blog/brass-vs-bronze/
05:59 PM Tom_L: the punch would require an undercut endmill for relief which i don't have
06:00 PM Tom_L: about a 2 degree taper with about .050" flat on the cutting part to allow for resharpening
06:05 PM Tom_L: flame harden the edge with a torch and wet rag, you don't need to heat treat the whole thing
06:42 PM rue_mohr: mmm
06:42 PM rue_mohr: its for fire alarm panels, the new one they make is short and really expensive
06:43 PM Tom_L: oh
06:43 PM rue_mohr: what kinda brass do you thik they use for keys
06:43 PM rue_mohr: ?
06:43 PM Tom_L: brass
06:43 PM Tom_L: nothing special
06:43 PM rue_mohr: hahah
06:43 PM rue_mohr: ok
06:43 PM Tom_L: why?
06:44 PM rue_mohr: why the key?
06:44 PM Tom_L: why the brass key question
06:44 PM rue_mohr: I was pondering making them
06:44 PM rue_mohr: I know there is a market
06:44 PM rue_mohr: a small one :)
06:45 PM Tom_L: corner market
06:45 PM rue_mohr: might be able to sell a good number of those dies too
06:47 PM Tom_itx: https://www.l-com.com/d-sub-punch-db9-hdb15-hole-greenlee-229
06:47 PM Tom_itx: bargain
06:48 PM Tom_itx: https://www.ebay.com/p/1511980900
06:48 PM Tom_itx: needs the arc on the cutter or it takes too much force
07:04 PM rue_mohr: damn, the motor driver just blew
07:04 PM rue_mohr: at 350V it was violent!
07:22 PM Tom_L: well yah
07:35 PM Tom_L: https://www.youtube.com/watch?v=y2-I4qykPDo
07:36 PM Tom_L: might not work for you
07:39 PM rue_mohr: and, it wasn't my circuit that failed...
07:39 PM rue_mohr: I left in the flyback diodes for spikes off the motor
07:40 PM rue_mohr: and, as it turns out, the spikes were jacking up the voltage on the main power supply caps
07:40 PM rue_mohr: the ones that normally have 175V, and are rated to 250V
07:40 PM rue_mohr: they had a surge protector across one (?) of the caps
07:41 PM rue_mohr: and I just happened to bump over the voltage on that one
07:41 PM rue_mohr: and the protector blew to hell
07:41 PM rue_mohr: took the fuse with it
07:43 PM Tom_L: so the main circuit is good?
07:51 PM rue_mohr: yea
07:51 PM rue_mohr: I need to make a circuit to dump excess voltage
07:52 PM rue_mohr: which is a thing
07:52 PM rue_mohr: and I didn't think of it
07:52 PM rue_mohr: my welder does it
07:52 PM Tom_L: until now
07:52 PM rue_mohr: idle it sits there going ZZZZZZZZZ
07:52 PM rue_mohr: knocking off extra voltage from its bulk supply
07:52 PM rue_mohr: drives me nuts
08:00 PM Tom_L: https://www.youtube.com/watch?v=OpIRhkTOPAI
08:00 PM Tom_L: your new house
08:02 PM rue_mohr: I like the wiggle cuts in the foam to bind it
08:07 PM rue_mohr: hah no safety strap doing the roofing
08:07 PM Tom_L: would be good up in your cold country
08:07 PM rue_mohr: wow the place looks tiny
08:08 PM Tom_L: 2 story
08:08 PM rue_mohr: I dont get anything but the video window, whats the brick made of?
08:08 PM Tom_L: foam i think
08:09 PM Tom_L: i got no sound
08:10 PM rue_mohr: hah, its harder than that I think
08:10 PM Tom_L: By design, the house is simple and consists of light blocks (aerated concrete).
08:11 PM Tom_L: https://www.youtube.com/watch?v=rnCeFBMY8i4&t=0s
08:11 PM Tom_L: full version
08:11 PM rue_mohr: huh
08:11 PM Tom_L: We built this house for elderly parents. By design, the house is simple and consists of light blocks (aerated concrete).
08:11 PM Tom_L: The total area of the house is 640 square feet and the exterior dimensions are 18 by 22 feet.
08:11 PM Tom_L: We built this house without loans and on a small budget of $17,000. This cost also included the purchase of a piece of land for $2,000. The total budget did not include the cost of workers, since we did all the work ourselves.
08:12 PM rue_mohr: europe, wow, shallow electrical
08:12 PM rue_mohr: wtf, in wall splices!?
08:12 PM Tom_L: heh
08:13 PM Tom_L: i thought you might find that on interesting
08:16 PM rue_mohr: their construction is so much harder to modify
08:17 PM rue_mohr: just gonna plaster the brick aren't they...
08:17 PM rue_mohr: yep
08:20 PM rue_mohr: no, you start the tiles centered on the room...
08:20 PM rue_mohr: oh dear
08:20 PM Tom_L: i've seen them use something similar here
08:21 PM Tom_L: https://www.buildwithrise.com/stories/mythbusting-icf-sustainable
08:21 PM Tom_L: that's the type used around here i think
08:21 PM rue_mohr: they didn't just brick in all that squipment did they?
08:21 PM rue_mohr: hmm
08:21 PM Tom_L: i know they fill the void with concrete
08:22 PM rue_mohr: that hot water tank gets annoying I bet
08:22 PM Tom_L: 3rd pic down on that last link shows the type here
08:22 PM Tom_L: or similar
08:23 PM rue_mohr: yea, they prettymuch just burry all the equipment
08:25 PM Tom_L: better get it right the first time
08:36 PM Tom_L: homes built today are made to last a generation or two, not like old ones that lasted half dozen
08:59 PM rue_shop3: 221KD07 180VDC 1/4w
09:00 PM rue_shop3: hmm
09:54 PM rue_mohr: I really done know how big to make the clamp circuit
09:54 PM rue_mohr: or how complex
09:55 PM rue_mohr: I know I need more than 1.4w
09:55 PM rue_mohr: er
09:55 PM rue_mohr: 1/4
09:55 PM rue_mohr: 20w resistors are pretty big
09:56 PM rue_mohr: I wonder if I should just aim at like 10w and see how it goes
09:57 PM rue_mohr: the problem is the margin
09:57 PM rue_mohr: so, the circuit is normally 175v
09:57 PM rue_mohr: the capacitors are 200v
09:57 PM rue_mohr: the mov was rated for 180
09:58 PM rue_mohr: maybe if I draw a 50%, and call it 190V
09:58 PM rue_mohr: so, at 190V, from 175, I want 10W