#linuxcnc Logs
May 01 2019
#linuxcnc Calendar
04:21 AM BitEvil is now known as SpeedEvil
04:57 AM Tom_L: morning
04:57 AM XXCoder: morning
05:20 AM Deejay: hi
05:23 AM jthornton: morning
05:41 AM XXCoder: morning
05:41 AM _unreal_: yawn
05:45 AM _unreal_: getting ready for work and putting funding into my daughters lunch account
05:45 AM _unreal_: long gone are the days of lunch money :) I use to collect that shit :)
07:16 AM miss0r: 'ello
07:48 AM JT-Shop: hi
09:17 AM ziper: _unreal_, what material should I use to CNC a mold out of
09:40 AM SpeedEvil: ziper: cheese.
09:49 AM ziper: SpeedEvil, a mold for frp parts
09:51 AM SpeedEvil: how large parts?
09:53 AM gregcnc: how many is also worth considering
10:07 AM jym: SpeedEvil: moldy cheesy?
10:27 AM gregcnc: moldy cheese will make a mess of your coolant
10:28 AM Elmo40: Havarti
10:28 AM jym: Elmo40: that's cheese abuse!!!
10:42 AM Tom_L: granite
10:48 AM Loetmichel: MAAN am i out of shape. just hung a bathroom cabinet, drilled a hole for the drain into a "under sink cabinet", vacuumed the whole room, mopped up the whole room and the tiled walls... threw in some bamboo mats and already the no air left. Huffing and puffing like the wolf in the pig tale...
10:50 AM * jym slaps an oxygen tank in to Loetmichel's vape
10:51 AM Loetmichel: anyhow: talked yesterday with a coworker about training and gym and stuff. He said "i doubt that i can do a single pushup nowadays"... so we tried: he can do 10, i can do 20, then i am out of breath completely. Not much but not THAT bad for a 5'9" 265 lbs 50 year old man ;)
10:56 AM jym: Loetmichel: Before ordeing a new mod, I'm trying out my existing mech mod with drip tank. Still not sure if vaping is for me or not. it's frustrating, I might just have some old juice that's lost it's flavor too
11:02 AM ziper: SpeedEvil, gregcnc about 1 meter long, 10cm wide, 1 cm deep. If the design is good, a couple dozen. more likely only one or two
11:42 AM jthornton: Loetmichel: your stomach has to leave the ground or it don't count lol
11:42 AM Loetmichel: jthornton: it did ;)
11:48 AM * jym tosses Loetmichel the feeler gauge
11:49 AM Loetmichel: jym: no need, cowoerker said he could see plenty light underneat the belly
11:49 AM Loetmichel: each time ;)
11:49 AM jthornton: just messing with you
11:50 AM jym: Loetmichel: lol,
11:52 AM jym: jthornton: I know you link mint, but have you looked at mate?
11:53 AM jthornton: what are you asking?
11:53 AM jym: Loetmichel: You weren't on a glass/plexi floor were you?
11:53 AM jym: jthornton: I thought you mentioned once that you weren't 100% pleasead with Mint.
11:54 AM gregcnc: ziper, similar to model airplane wings, im guessing your hydro. Airplane guys use MDF for that volume. Route, epoxy, recut for finish just fraction above the wood. Corian is also common though, more permanent tools in aluminum.
11:54 AM jthornton: I still don't understand the question... mint = OS, mate = Desktop
11:54 AM jym: jthornton: Ubunto-Mate == OS
11:55 AM ziper: gregcnc, ok. i didnt think of recutting after epoxying it. good idea
11:55 AM jthornton: ubuntu is an OS and mate is a desktop that can be used with lots of OS's
11:55 AM jym: jthornton: https://ubuntu-mate.org/
11:56 AM jym: gregcnc: I thought they used foam?
11:56 AM gregcnc: for molds
11:57 AM jym: gregcnc: molds for what, the structure, then enevelope in it in material?
11:57 AM gregcnc: hollow molded carbon
11:57 AM jym: gregcnc: oh, gotcha
11:57 AM jthornton: jym: ubuntu is still the OS and mate is the desktop...
11:59 AM jym: jthornton: Well, it acts and feel much different than common ubuntu
12:00 PM jthornton: the desktop is the act and feel not the os
12:00 PM jthornton: gnome is so bloated it ain't funny and IIRC that is the ubuntu normal desktop
12:01 PM jym: jthornton: I was just offering it as a suggestion. And it's MUCH more than just the GUI that feels/acts differently imo
12:03 PM jthornton: the desktop IS the GUI
12:03 PM ziper: is foam an option? what type?
12:03 PM jthornton: and I use Mate on Mint and Debian...
12:04 PM gregcnc: Foam I think, would also work, just depends how much detail you need and if you can tolerate making a new mold if the part sticks
12:04 PM jym: ziper: I was speaking of EPS (styrafoam) that is cut using a hotwire
12:05 PM jym: ziper: ... or a CNC hot wire foam cutter to shape the foils.
12:05 PM ziper: too complex for that
12:05 PM jym: ziper: what is too complex?
12:06 PM ziper: elliptical planform
12:06 PM gregcnc: heavier modeling foams are quite expensive, so hobby guys use MDF
12:09 PM ziper: could I use "real" wood?
12:10 PM gregcnc: I suppose, but it's far more likely to twist as you cut or with humidity
12:11 PM ziper: ok
12:13 PM roycroft: some woods would be ok, such as european beechwood or some species of african blackwood
12:14 PM roycroft: but those would also be expensive and difficult to machine
12:14 PM gregcnc: cheaper than MDF?
12:14 PM roycroft: no, much much more expensive
12:14 PM gregcnc: seems the main factor is cost
12:14 PM roycroft: i'm not addressing that
12:15 PM roycroft: just the question about using "real" wood
12:15 PM gregcnc: heh I did
12:15 PM roycroft: i would not recommend using "real" wood
12:15 PM roycroft: but it would work fine
12:15 PM roycroft: as in it could be machined accurately, albeit with difficulty, and hold its shape reasonably
12:15 PM gregcnc: Gold would be bling
12:15 PM gregcnc: maybe a bit soft
12:16 PM roycroft: and easier to machine than some species of wood
12:17 PM jym: ziper: https://youtu.be/yKpq9FZMPqQ?t=199
12:17 PM roycroft: but i can't see chucking a big gold bar in a machinist's vise and making gold chips on a milling machine
12:17 PM roycroft: that would be rather over the top
12:18 PM gregcnc: just as practical as some exotic wood
12:20 PM jym: Cocobolo ftw
12:22 PM roycroft: how about brasilian rosewood?
12:23 PM roycroft: endangered, very very expensive, restricted import/export, incredibly hard and stable once it's dried
12:24 PM gregcnc: or the cheapest most readily available, but whatever
12:32 PM ziper: if its going to be epoxy coated anyway, what would be wrong with pine?
12:35 PM gloops: reclaimed or old pine is stable
12:35 PM ziper: i have no problem with using mdf, just curious
12:35 PM gloops: most quality old cabinets had pine carcasses with veneer over
12:36 PM gloops: whats this wood for anyway?
12:37 PM roycroft: mdf would be better than pine
12:37 PM roycroft: it's way more stable
12:37 PM roycroft: and pine often has issues with resin that seeps out of it
12:37 PM gloops: in a moisture free atmosphere maybe
12:37 PM andypugh: Loetmichel: https://hundredpushups.com/index.html
12:37 PM roycroft: he said it would be epoxy coated
12:38 PM roycroft: i use mdf all the time
12:38 PM Loetmichel: andypugh: i dont think i need that ;)
12:38 PM andypugh: (I tried that once, and did, indeed, get to 100 pushups. I think it took 4 weeks)
12:38 PM roycroft: it's a great building material
12:38 PM Loetmichel: i sas just surprised that i still can do 20 without doing any training for decades
12:38 PM gloops: lol, im afraid i cant agree roycroft
12:39 PM ziper: is there any problem with getting a good surface finish out of the machine with mdf?
12:39 PM roycroft: that's fine
12:39 PM gloops: yes
12:39 PM andypugh: Yes, you pretty much can’t in my experience.
12:40 PM roycroft: cabinetmakers all over the world agree with me and not you
12:40 PM roycroft: including ones that make high end stuff
12:40 PM andypugh: You have to seal, sand and paint.
12:40 PM andypugh: (I used big blocks of MDF to make foundry patterns)
12:40 PM ziper: how do I sand it without changing my very important and specific (and totally not drawn out of a hat with minimal actual analysis) foil section?
12:41 PM roycroft: mdf as the core for veneered panels is superior to plywood or solid wood in almost every way
12:42 PM andypugh: ziper: Carefully
12:42 PM andypugh: If you seal it with Zinsser BN (nothing else works as well) then don’t sand off all the paint, the profile isn’t changed, is it?
12:43 PM andypugh: Sorry, I mean BIN: http://www.zinsseruk.com/product/b-i-n/
12:43 PM gloops: i find on the router that you can get a reasonable finish on mdf where the cutter is working in a linear way, like profiling, when the cutter is working in a rotary fashion its not easy to get a decent finish
12:43 PM roycroft: is that the shellac-based primer, andypugh?
12:44 PM andypugh: Indeed it is
12:44 PM roycroft: yes, that stuff is great
12:44 PM roycroft: don't use a water-based finish directly on mdf
12:44 PM ziper: why should I use that instead of epoxy based stuff
12:44 PM andypugh: No mixing, goes on like paint.
12:45 PM roycroft: and if you need to do any further machining it's a lot more gentile on your tooling
12:45 PM andypugh: By Epoxy I assume you mean https://www.easycomposites.co.uk/#!/patterns-moulds-and-tooling/pattern-making/composite-pattern-coat-hi-gloss.html
12:46 PM andypugh: I think you might use both.
12:46 PM gloops: if you want a polished finish id spray it with high build primer
12:46 PM ziper: I've been scared off of spraying anything
12:46 PM gloops: and get sanding back, building up etc
12:46 PM andypugh: The primer to seal the surface and kill the fluff for sanding, then the patten coat for the hard, high-gloss finish.
12:46 PM ziper: dont have a booth
12:47 PM ziper: dont have a forced air respirator
12:47 PM gloops: use spray cans?
12:47 PM gloops: celluslose paint wont kill you, or not quickly enough that youd notice
12:47 PM ziper: I didn't say I don't have a gun or compressor
12:48 PM roycroft: i can get a mirror-like finish on mdf by repeated coats of shellac-based primer, sanding between coats, then a couple color coats, again sanded between coats, all applied with a low-nap roller, and then clearcoat on top of that
12:48 PM ziper: i dont even know what pattern coat is
12:48 PM roycroft: the clearcoat being sprayed, of course
12:50 PM ktchk2: new 4-axis router, which cam software produce g-code for a axis? is Deskpro good ?
12:50 PM roycroft: pattern coat is a trade name for a product whose url andypugh linked to above
12:50 PM andypugh: ziper: It’s a resin paint, in effect. It hardens without shrinking, so the as-painted finsih is what you end up with. Unlike normal paint, which shrinks back to show the underlying topgraphy.
12:50 PM gloops: vectric aspire does indexing
12:50 PM gloops: but pricey, G-Code Ripper does indexing (free)
12:50 PM ziper: whats the difference between that and high build paint?
12:51 PM gloops: but primitive
12:51 PM andypugh: ziper: It’s a resin paint, in effect. It hardens without shrinking, so the as-painted finsih is what you end up with. Unlike normal paint, which shrinks back to show the underlying topgraphy.
12:51 PM ktchk2: gloops: Deskpro??
12:51 PM gloops: not used it ktchk2
12:52 PM gloops: fusion 360 also
12:52 PM andypugh: At that same URL is this tutorial, which is a rather interesting and effective way to go from CAD to perfectly finished mould tooling all by hand: ziper: It’s a resin paint, in effect. It hardens without shrinking, so the as-painted finsih is what you end up with. Unlike normal paint, which shrinks back to show the underlying topgraphy.
12:52 PM andypugh: Doh!
12:52 PM ktchk2: gloops: whick is under linux?
12:52 PM andypugh: Sorry, let me copy the URL again.
12:52 PM andypugh: https://www.youtube.com/watch?v=XeeSsmsm9h0
12:52 PM gloops: i think G-Code ripper runs on linux
12:53 PM gloops: http://www.scorchworks.com/Gcoderipper/gcoderipper.html
12:53 PM ktchk2: gloops: only that
12:53 PM gloops: i had a play with it a while ago, it does produce code that looks ok
12:54 PM gloops: no previews or anything though
12:54 PM ziper: yes ive watched the video
12:55 PM andypugh: Can I buy tool steel in an equilateral triangular shape, I wonder?
12:55 PM gloops: triangle bar tool steel?
12:55 PM roycroft: i've never seen it but there are triangular files, so someone likely makes it
12:57 PM ktchk2: 4-axis or Deskpro anyone??
12:58 PM ktchk2: gloops: thanks
12:58 PM gloops: https://www.cncwrapper.com/ < temporarily unavailable
12:59 PM ktchk2: gloops: bobcad also doing wrapping
01:00 PM gloops: im not sure if the hobby license F360 does it, or only subscription level, probably be decent to use though
01:05 PM andypugh: Pretty sure that F360 can do indexing.
01:05 PM andypugh: https://www.youtube.com/watch?v=EDmFkablCCU
01:07 PM ktchk2: andypugh: thanks
01:09 PM ktchk2: bye
01:14 PM andypugh: I have managed to taunt an American in to claiming that ENIAC was the first computer in a Hackaday comments thread. :-)
01:19 PM Tom_L: took up a whole building didn't it?
01:41 PM Loetmichel: GNAAAAAHHH! just noticed that my last 3 saves in Fallout4 are 0 bytes... about 50 hours of game time gone. MAN that sucks :-(
01:45 PM Loetmichel: i REALLY should have made the C:/ partition bigger than 100 gig... (on the other hand: what bad programming to just write an empty file instead of a savegame when there is no room. No warning nothing ingame :(
01:49 PM andypugh: Linux is bad that way.
01:49 PM andypugh: This is what I want the triangular tool steel for: https://a360.co/2ISRtOd
01:49 PM andypugh: To clamp into a bundle, then machine into an expanding collet.
01:50 PM andypugh: Can’t machine then cut, I need zero kerf thickness
01:53 PM Rab: andypugh, this is for flaring tubing, correct? Can you just press a hexagonal die into the tube?
01:54 PM andypugh: Yes. But then I can’t get it out
01:54 PM andypugh: (Actually, even pressing it in is difficult. 300mm long tube, 0.2mm wall thickness.
01:54 PM Rab: Does there need to be an inwards lip at the end?
01:55 PM andypugh: Tubes are long and fragile and need to stay straight
01:57 PM roycroft: if you use lvm you can expand filesystems on the fly, loetmichel
01:59 PM Rab: andypugh, how about hydroforming with an external die?
02:03 PM Rab: Of course an expanding hexagonal collet will form a dodecagonal shape in the tubing, don't know if that's a problem but you have probably already considered it.
02:12 PM gloops: https://www.ebay.co.uk/itm/Boxford-Cnc-260-Vmc-Milling-Machine/273827262816?
02:14 PM Rab: "never had the time same old story"
02:15 PM gloops: a lot of things like that in garages, just waiting for someone with the time
02:16 PM Rab: I have a few.
02:17 PM gregcnc: there are people with much more expensive paperweights
02:24 PM andypugh: I suspect those little Boxford’s are not much more than educational toys anyway
02:25 PM andypugh: Rab: The expansion slots are in the flat faces, not the corners
02:25 PM Rab: andypugh, ohh
02:25 PM andypugh: (So yes, I did think of that :-)
02:27 PM Rab: The triangles would not be equilateral, correct?
02:28 PM gregcnc: take it to a wire edm shop
02:30 PM andypugh: Rab: They need to be 60 degree internal angle. Which pretty much means equilateral.
02:31 PM andypugh: gregcnc: How thin is their thinnest wire?
02:32 PM andypugh: <Google> Some processes use 20µm wire. That would be fine :-)
02:33 PM gregcnc: why is the gap a limit factor?
02:34 PM andypugh: It isn’t a limit, except that I do need to have some hex reamaining.
02:34 PM gregcnc: what size is this hex?
02:34 PM andypugh: And the hex is 2mm on each side
02:36 PM gregcnc: ah quite small
02:36 PM gregcnc: I didn't check that in the model
02:36 PM andypugh: Back the the workshop!
02:58 PM * JT-Shop needs to quit while he is ahead, made a door handle puller for the slide hammer and it worked, converted the light over the sink to LED (after cutting a large hole to get can light out)
03:27 PM JT-Shop: pcw_home: what is a 4i24 for?
03:36 PM andypugh: I should have quit before it went wrong…
03:36 PM andypugh: My hex expander is now scrap.
03:39 PM JT-Shop: that's gotta be real tough to make something that small
03:39 PM XXCoder: :( sucks
03:41 PM gregcnc: it's always faster the second time
03:59 PM andypugh: Yes, there is that.
03:59 PM andypugh: And I have made most of it, and the special tools.
03:59 PM andypugh: I just need to re-make the petals.
04:00 PM XXCoder: right now it expands out right?
04:00 PM andypugh: Yes
04:00 PM XXCoder: i wonder if theres a way to expand and still retain contact to each other
04:00 PM XXCoder: like apenture
04:00 PM XXCoder: contact for strength and support
04:01 PM gregcnc: the taper supports the fingers on the ID
04:02 PM XXCoder: ahh must have missed that
04:02 PM gregcnc: cantilevered I doubt it would work
04:03 PM XXCoder: oh
04:03 PM andypugh: I did make a Mk1 based on the scroll-chick design.
04:03 PM andypugh: But the fingers were too weak in cantilever.
04:06 PM gregcnc: hex expander is rather unique
04:06 PM andypugh: So it seems
04:07 PM andypugh: New method to make the petals.
04:09 PM Deejay: gn8
04:12 PM andypugh: 1) take 8mm silver steel and use the 4th axis to make triangular on 2 sides (equilateral triangle centred on the axis)
04:13 PM andypugh: 2) Hold the stack of 6 in a hexagonal collet (15mm is perfect) and turn a register to clamp one end
04:13 PM andypugh: 3) hold that register in an ER16 collet while machine the rest of the OD
04:13 PM andypugh: 4) Clamp in a 9mm ER collet to machine the internal features.
04:14 PM andypugh: https://imagebin.ca/v/4fdJhaPU9uQM
04:15 PM gregcnc: soldered together or ???
04:15 PM andypugh: I kind-of want an ER16 live centre :-)
04:15 PM andypugh: I don’t think that they need to be stuck together as long as they are clamped
04:16 PM andypugh: https://www.youtube.com/watch?v=IJ9qVexXirk
04:17 PM andypugh: Is the same idea (but using a shrink-on collar)
04:17 PM andypugh: That was the 4-way petals for my pneumatic draw bar.
04:18 PM andypugh: But that was easy. 4-jaw chuck and sections of square tool-steel.
04:18 PM gregcnc: does that drill without trouble?
04:18 PM andypugh: Yes, before hardening.
04:20 PM andypugh: All the cool kids seem to have 6-jaw chucks, and one would really help here too.
04:20 PM syyl: :D
04:20 PM syyl: i am not very cool
04:21 PM syyl: but the six jaw rocks.
04:21 PM andypugh: But I was actually thinking specifically of you :-)
04:22 PM andypugh: They aren’t _that_ expensive until you add on the D1-4 backplate
04:22 PM syyl: the price still hurt a bit
04:23 PM syyl: i made my backplate out of a chunk of cast iron
04:23 PM gregcnc: yeah i should have a regular search on Ebay for one
04:23 PM andypugh: D1-4 ?
04:23 PM syyl: D1-3
04:23 PM syyl: but without the camlock bolts
04:23 PM syyl: the emco is a bit weird
04:23 PM andypugh: I have actually already made a few D1-4 backplates, and even a whole D1-4 spindle nose for the rotary
04:23 PM andypugh: Ah, the ISO nose?
04:23 PM syyl: yes
04:24 PM syyl: same short taper as D1-3, just with trough-bolts
04:24 PM andypugh: All the cool kids have camlock :-)
04:24 PM syyl: i thought all the cool kids have hardinge-taper ;)
04:25 PM andypugh: I wonser if that is any good? It seems like it should be really weak.
04:25 PM syyl: seems to be good enough for robin renzetti ;)
04:25 PM syyl: i can see it work very well - the taper is very long and not very steep
04:25 PM syyl: and the engagement pin has a very low "pitch"
04:25 PM syyl: so it should be rigid
04:26 PM syyl: but you can load it only in one direction
04:26 PM andypugh: I have a friend called Robin Szemeti. (use to play with LinuxCNC, actually) I tend to confuse the names.
04:26 PM syyl: haha
04:26 PM andypugh: All this talk of Youtube reminds me, ’tis Wintergatan Wednesday
04:27 PM syyl: :D
04:27 PM syyl: reminds me that i need to go to work tomorrow
04:27 PM syyl: dang it ;)
04:28 PM andypugh: I am going to work on Sunday. (Travelling to Germany to work on our May Day holiday)
04:28 PM andypugh: I seem to have planned that poorly.
04:28 PM syyl: Oo
04:29 PM roycroft: today is beltane
04:29 PM roycroft: the first day of summer
04:29 PM skunkworks: Watched it alread... Always entertaining...
04:30 PM skunkworks: I think he is going to have a problem with the ball lifting (around the gears..)
04:39 PM andypugh: syyl: Actually, this seems like youir sort of game, how would you make that hex-expander?
04:39 PM andypugh: (it screws on to the nose of a rivnut too)
04:40 PM syyl: hex expander?
04:40 PM syyl: like an external-hex-collet?
04:40 PM andypugh: https://a360.co/2ISRtOd
04:41 PM andypugh: For expanding 3.6mm bore tube
04:41 PM andypugh: The explode tool might be useful to see how it works.
04:42 PM syyl: what madman designed this thing? :D
04:44 PM andypugh: Well, that is design 2.
04:44 PM andypugh: Design 1 was madder still.
04:44 PM syyl: ok
04:44 PM syyl: if i had to make it, that would mean a lot of grinding ;)
04:45 PM syyl: the fingers that make up the hex need probably to be hard
04:45 PM syyl: and the tapered mandrel too
04:45 PM andypugh: I hardened the jaws on Mk1 ( https://photos.app.goo.gl/F6M4vZV6Lb3Y4WPCA ) Too much. One snapped.
04:45 PM syyl: did you temper it back?
04:45 PM andypugh: Yes, but probably not enough.
04:46 PM syyl: i wouldnt go beyond 50hrc here
04:46 PM andypugh: The centre cone is machined from a high-tensile shoulder bolt.
04:47 PM syyl: i might want to do the segments all soft, harden them and then clamp them together and hardmill/grind the hex on the end
04:48 PM andypugh: And having held the parts in my hand I think I will make the small part of the pull-cone even smaller (2mm rather than 2.5) to leave more metal in the petals.
04:48 PM syyl: the hex is awfull thin, yes
04:48 PM syyl: i think you can go way thinner on the mandrel/cone in general
04:49 PM andypugh: hard-mill is difficult with a 1200 top spindle speed.
04:49 PM syyl: a piece of 1mm spring-steel with a cone welded/brazed onto the end might be enough
04:49 PM andypugh: I hardly ever go below 3mm in screws, but yes, the mandrel feels stronger than I imagined looking at the CAD
04:51 PM andypugh: Hydroforming in a die would seem like a good plan in production.
04:51 PM andypugh: As it would be nice to have 3 other swelled portions through the length of the tube.
04:53 PM andypugh: A bicycle spoke might be a good actuating shaft.
04:53 PM syyl: they should be spring steel, yes
04:54 PM andypugh: For the moment I wil persist with the part I already made, though. I can redesign if that is a failure point.
04:54 PM andypugh: My real question was how to make the 6 petals.
04:55 PM andypugh: Ideally I would just buy 6 triangular sections of tool steel, clamp them together in a 6-jaw chuck and machine away….
04:55 PM syyl: hm
04:56 PM syyl: 6 triangular pieces of toolsteel
04:56 PM syyl: and slip a clamp-collar over it
04:57 PM syyl: like a split bushing
04:57 PM andypugh: I am also open to suggestions for a Mk3 version.
04:57 PM syyl: outsource? :D
04:58 PM andypugh: Well, I can’t seem to find triangular, so currently I am thinking in terms of milling two flats on to round tool steel, then wedging them into a hexagonal collet: https://imagebin.ca/v/4fdJhaPU9uQM
04:58 PM andypugh: I _am_ the outsource :-)
04:58 PM andypugh: Thos isn’t for me.
04:58 PM syyl: haha
04:58 PM syyl: one of *those* projects
04:59 PM syyl: buy an wire-edm and split the part after machining in 6 pieces?
04:59 PM andypugh: That would certainly be nice. Especially as I could not split all the way, and that would keep the petals in the right ordrer.
05:00 PM syyl: are you comfortable using a 0.2mm slitting saw in toolsteel?
05:00 PM syyl: turn/mill from soft toolsteel, slit almost all the way to the end and then harden
05:01 PM syyl: airhardening toolsteel would give you a fighting chance not creating a mess.
05:01 PM andypugh: One problem with that approach is assembly.
05:02 PM andypugh: (though only if I refuse to redesign the pull mandrel)
05:02 PM syyl: there we go ;)
05:02 PM syyl: now you got something to do
05:02 PM syyl: maybe i have a better idea tomorrow
05:03 PM syyl: goodn8!
05:03 PM andypugh: But the design does rather need a non-rotating hexagonal end on the mandrel to try to keep the expansion symmetrical on the tube. (A problem I found with Mk1)
05:03 PM andypugh: Goodnight.
05:22 PM Loetmichel: roycroft: what does c:/ partition indicate? :-)
06:20 PM jym: Loetmichel: you mean c:\ and not c:/ =)
07:11 PM Tom_L: andypugh you need triangular hss blanks?
07:12 PM andypugh: Probably not HSS, I need to machine it.
07:12 PM Tom_L: https://www.travers.com/hss-regrindable-tool-bits/p/75389/?lite=true&pricelistname=SITE
07:12 PM Tom_L: yeah those are probably hard
07:13 PM Tom_L: probably too short anyway
07:22 PM skunkworks: I thought andy said goodnight...
07:23 PM Tom_L: to someone else
07:23 PM Tom_L: syyl
07:23 PM skunkworks: oh... Reading comprehension isn't my strong point... and spelling
07:24 PM Tom_L: you make up for it...
07:33 PM andypugh: Yes, those look too short, and the wrong shape of triangle too.
07:34 PM Tom_L: you need 60 deg?
07:48 PM flyback is now known as phlyback
07:48 PM phlyback is now known as flyback