#linuxcnc Logs

Apr 03 2022

01:17 AM -!- #linuxcnc mode set to +v by ChanServ
01:46 AM Deejay: moin
02:41 AM -!- #linuxcnc mode set to +v by ChanServ
05:22 AM Tom_L: morning
05:41 AM -!- #linuxcnc mode set to +v by ChanServ
05:41 AM -!- #linuxcnc mode set to +v by ChanServ
10:14 AM Tom_L: quiet morning
11:04 AM roycroft: i user cedar or redwood for my garden beds, and don't use any kind of sealer on them
11:04 AM roycroft: they usually last about 15 years
11:05 AM roycroft: back east, cypress would be a good option for that
11:16 AM unterhaus_: you have access to better cedar than we do
11:16 AM unterhaus_: but in any event, it would be vastly more expensive to use rot resistant wood here
11:21 AM unterhaus_: my backyard neighbor said I was doing it wrong and that he had built someone a 4x8 raised garden out of cedar with $600 worth of wood
11:21 AM unterhaus_: yeah, not gonna happen
11:22 AM unterhaus_: too bad cherry and walnut aren't rot resistant, we can get that fairly cheap in comparison to the rest of the states
11:24 AM Tom_L: for $600 you could lay cement block or concrete
11:24 AM Tom_L: or even those stackable blocks
11:29 AM roycroft: southern yellow pine is pretty durable
11:30 AM roycroft: some folks around here use untreated douglas fir for outdoor projects, and while it lasts quite a while, it's not nearly as good as cedar or redwood
11:30 AM roycroft: and is probably rather expensive back east
11:33 AM unterhaus_: I made a couple out of doug fir last year. It wasn't going up as much as pine
11:33 AM unterhaus_: prices may have rectified
11:33 AM unterhaus_: I use pressure treated for the lower boards and pine or doug fir for the top
11:34 AM unterhaus_: I have finished some with blo, not sure if that helps at all
11:34 AM unterhaus_: assuming the lumber bubble tanks again, I can build them for $50, so 10 times
11:35 AM unterhaus_: but from what I've seen, they don't go bad that quickly
11:36 AM roycroft: we have a scenic mountain drive just east of here named "aufderheide"
11:36 AM roycroft: it is undergoing some construction/restoration, and as such is in the news right now
11:37 AM roycroft: two different presenters today have pronounced it "after hide"
11:37 AM * roycroft cringes whenever he hears it that way
12:37 PM Tom_L: how do you move a part from one plane to another in SW?
12:38 PM unterhaus_: part or sketch?
12:38 PM Tom_L: part
12:38 PM Tom_L: i need to reorient the whole thing
12:38 PM unterhaus_: so in an assembly?
12:38 PM Tom_L: no
12:39 PM Tom_L: i want to change the plane it was created on
12:39 PM unterhaus_: okay, that's your first problem, it's not a part
12:39 PM Tom_L: it is a part
12:39 PM Tom_L: imported from iges
12:40 PM unterhaus_: I have never had much luck with that
12:41 PM Tom_L: i'll try in catia before i export it then
12:41 PM Tom_L: i _think_ i remember how to do it there
12:42 PM unterhaus_: move/copy body apparently can work
12:42 PM unterhaus_: they wouldn't call it a part, so if you search for that you'll get poor results
12:44 PM Tom_L: where's 'move' on the tool bar?
12:46 PM unterhaus_: insert features move/copy
12:46 PM unterhaus_: it may not be in your menus in which case you have to add it
12:46 PM unterhaus_: also supposed to be on the features toolbar, but likely you have to add it
12:47 PM Tom_L: not letting me do it
12:47 PM unterhaus_: someone in france is laughing right now
12:47 PM unterhaus_: select body first maybe?
12:47 PM Tom_L: tried that too
12:47 PM unterhaus_: je suis vraiment desole
12:51 PM -!- #linuxcnc mode set to +v by ChanServ
12:54 PM roycroft: i've never figured out how to move a part to a new plane
12:54 PM roycroft: i end up copying the part to the new plane and then deleting the original part
12:54 PM Tom_L: ok i figured what i needed.. thanks anyway
12:55 PM roycroft: i wonder if i need to shop for a new pid controller
12:55 PM roycroft: i've been really happy with the ones from auber instruments, and i know how to program them, so i'd like to stick with them
12:56 PM roycroft: but i have an application where i need an alarm relay to be normally closed, and open at the alarm condition, and their pid controllers don't do that as far as i can tell
12:57 PM roycroft: which seems odd - it is common to want to open a circuit when an out of bounds condition is reached
12:57 PM roycroft: i'd rather not have to add another relay to invert the alarm relay state
12:57 PM * roycroft is trying to conserve space, as usual
05:44 PM srk- is now known as srk
06:01 PM srk- is now known as srk
06:56 PM roycroft: i found a nice contactor that has both nc and no connections, so i can use the pids i'm used to
06:56 PM roycroft: so yay
07:00 PM roycroft: i also ascertained that the pid controller will not fit easily in the base of the kiln itself, so i'll go with my original plan of building an external controller, which will be great - i won't have to alter the kiln at all except to add a second thermocouple, and a jack for plugging the external controller's thermocouple cable into the base of the kiln
08:22 PM mrec_: on vertical milling systems the table is usually done with dove tails or linear rails; is there any special handling if the table moves to the most left or most right side?
08:22 PM mrec_: I just wonder that the weight of the stock might get the table out of balance at some point
08:23 PM mrec_: I have seen a milling machine at a trade show which mounts the X rails on the bottom and the Y rails were mounted on top of it to avoid this problem
08:27 PM mrec_: tightening the gibs doesn't be a "final" solution because at some point it will make it stuck
08:35 PM roycroft: milling machines are generally designed to be able to support at least the average weight of the workpiece + fixturing apparatus at both extremes of the x axis
08:36 PM roycroft: if you're putting an unusually heavy part on the mill, it's best to at least somewhat center it on the table
08:37 PM roycroft: if you're concerned that you may have some deflection in yours, you can always indicate the table with a load at an extreme and see if there is any deflection
08:37 PM XXCoder: or counterweight it
08:38 PM XXCoder: could be just dummy block clamped into table, if you for some reason have no choice
08:39 PM roycroft: since the spindle is always over the best-supported part of the table it really isn't a problem
08:39 PM XXCoder: yeah
08:39 PM roycroft: if your 80kg part causes the table to sag a bit when it's stuck way out that's not an issue with most parts
08:39 PM roycroft: er, with most operations
08:39 PM mrec_: https://i.machinio.com/medium/1iicrsa/1600201378765.jpg
08:40 PM mrec_: with those machines it seems to be very difficult to me
08:40 PM CloudEvil: Protip. If the machine weighs less than the workpiece, bolt the workplace to the floor and invert the machine.
08:41 PM mrec_: imagine the table is on the most right side even the handle with the autofeed parts will very likely make it non-straight a little bit
08:41 PM mrec_: CloudEvil: portal machine... yes certainly.
08:41 PM XXCoder: now you thinking with portals
08:42 PM mrec_: I only have a vertical mill here, the portal machine I have is too weak and only used for a pick and place machine here
08:43 PM Tom_L: gibs are old school. linear rails is where it's at now
08:43 PM Tom_L: better support
08:44 PM mrec_: I once disassembled a chinese linear rail... the steel balls were like butter I was able to damage them so easily
08:45 PM mrec_: I checked them under the microscope back then.
08:45 PM XXCoder: yeah id do rebuild if I ever order any
08:45 PM XXCoder: order proper spec balls, ditch chineseium balls
08:45 PM XXCoder: remove flash on plastic parts, fix some stuff
08:46 PM mrec_: I'd just think putting a stock onto a table might already damage them.
08:47 PM CaptHindsight[m]: grinding hardened steel balls to actual rounds takes work
08:47 PM Tom_L: design to handle the loads you will be using
08:48 PM CaptHindsight[m]: you can save by using softer "metal" and getting them to partial rounds
08:48 PM CaptHindsight[m]: I have had Chinese bearings with detents
08:49 PM CaptHindsight[m]: the hope might have been that I didn't care or that they would round themselves during use
08:54 PM roycroft: gibs work fine
09:01 PM mrec_: roycroft: if the machine is too small they're not so easy to handle
09:01 PM mrec_: for sure they have their use case.
09:02 PM roycroft: if the machine is too small the machine is too small
09:02 PM mrec_: it always depends on the application
09:02 PM roycroft: well of course it does
09:02 PM roycroft: if it's not too small for a particular operation then it's not too small
09:04 PM roycroft: but that's not a function of the machine - it's a function of what you're trying to do with the machine
09:07 PM CaptHindsight[m]: 3 things, it can be too small for some jobs, just the right size for others and too big for yet other jobs
09:48 PM roycroft: are you going to tell us the tale of goldilocks and the three mills?
10:19 PM -!- #linuxcnc mode set to +v by ChanServ
11:07 PM CaptHindsight[m]: someones been milling on my mill!
11:08 PM XXCoder: milling while milling?
11:08 PM XXCoder: sounds like that certain guy com in
11:57 PM -!- #linuxcnc mode set to +v by ChanServ