#emc | Logs for 2007-10-22

[03:45:57] <Wowbagger_> When I mention it to people I always get "bah... that's easy".
[03:46:00] <cradek> if you have a certain size in mind, and cad, it really doesn't take that long to fill a font.
[03:46:08] <cradek> by hand I mean
[03:46:13] <Wowbagger_> Yeah
[03:46:37] <Wowbagger_> I don't have a real cad... but I had I think qcad which seemed reasonable.
[03:46:37] <cradek> those folks haven't tried, or aren't programmers, or haven't thought about it then
[03:47:05] <cradek> qcad is getting better.
[03:47:43] <Wowbagger_> Part of eagle does essentially the same thing as filling fonts (for pcb milling)...
[03:47:54] <Rabbitbunny> (#linux-coders)
[03:47:57] <cradek> yep
[03:48:35] <skinnypuppy34> Has Twingy mentioned Gcam progress lately?
[03:48:46] <cradek> eagle's algorithm probably only works with lines
[03:49:06] <Wowbagger_> Yeah.. I dunno
[03:49:50] <cradek> truetype are conic spline, postscript are cubic spline
[03:51:04] <cradek> in general the problem of filling fonts is 2.5D pocketing
[03:51:29] <cradek> there is a lot of scholarly work about the problem (I have some papers)
[03:51:43] <cradek> they're good/bad in that way all those scholarly papers are
[03:51:56] <Wowbagger_> Indeed.
[03:52:18] <Wowbagger_> As a scholar I contribute somewhat to the insanity.
[03:52:19] <cradek> "we got it to work, lookie at this powerpoint slide, now pass us"
[03:52:46] <cradek> when writing them I got bored at about page 3, and when reading them I can see that's universal
[03:52:56] <Wowbagger_> lol
[03:53:27] <Wowbagger_> So... for pocketing in general.. anything around?
[03:53:50] <cradek> nothing decent and Free that I've seen.
[03:54:04] <cradek> just waiting for one of us to write it.
[03:54:22] <cradek> (I'm not sure what gcam does...)
[03:54:24] <Wowbagger_> Maybe when I'm done this degree and not motivated enough to get a job I'll try. ;)
[03:54:39] <Wowbagger_> I just searched the gcam wiki for pocketing and came up dry.
[03:54:54] <cradek> I was afraid of that.
[03:55:09] <Wowbagger_> Well... gotta run.
[03:55:14] <Wowbagger_> Thanks.
[03:55:15] <cradek> goodnight
[03:56:04] <skinnypuppy34> http://gcam.js.cx/index.php/Manual_Example_2_-_Aluminum_Heatsink_for_Dual_60w_Audio_IC_with_Integrated_Jack_Panel
[03:56:41] <skinnypuppy34> I played with the last version a few hours and spit out miles of slot code
[03:58:45] <skinnypuppy34> http://gcam.js.cx/index.php/Manual_v2#Enable_Pocketing
[04:02:36] <skinnypuppy34> cradek did you get your enco vice dialed in any better?
[04:03:18] <cradek> I haven't figured out if the vise top and bottom aren't parallel, or if it's my table -- probably the table
[04:03:38] <cradek> I have to put a .003 shim under the right side to cut flat
[04:04:21] <SWPadnos> remove the vise and measure from spindle to table
[04:05:04] <cradek> I'fm not sure it's that easy, since the table doesn't move in a straight line
[04:05:07] <cradek> I'm
[04:05:15] <SWPadnos> err
[04:05:16] <cradek> but of course I should try that - I don't recall doing it
[04:05:29] <skinnypuppy34> Mine cuts flat, if you can keep the fixed jaw end from rising slightly when clamped...
[04:05:45] <cradek> this one doesn't do that
[04:05:52] <SWPadnos> that's why you get a "kurt-style" vise - they don't lift like that
[04:05:56] <cradek> yeah
[04:06:03] <toast> anglock!
[04:06:05] <toast> woooo!
[04:06:55] <skinnypuppy34> Think I'm going to go for a cnc style two part and make a dowel hole thread hole row plate
[04:07:13] <toast> two checks for the table are leaving an indicator in the spindle and sweeping the table back and forth
[04:07:33] <toast> to check the table's straightness compared to the ways/guides
[04:07:47] <cradek> I need to get one of those stones that takes the burrs off too
[04:07:50] <toast> then rotating the indicator in the spindle over the table to make sure the spindle is parallel to the table
[04:07:56] <toast> then, everything will cut straight
[04:08:14] <cradek> toast: if my tramming is wrong, I'm screwed (it's a rigid ram)
[04:08:18] <skinnypuppy34> I could use a little stoning but have scraped any highs
[04:08:23] <cradek> so, I haven't checked it :-)
[04:08:24] <toast> uh oh
[04:08:34] <toast> LIVING ON THE EDGE
[04:08:44] <skinnypuppy34> toast you ok or ko?
[04:08:49] <toast> ?
[04:08:52] <toast> ko?
[04:09:00] <cradek> the fly cutter does seem to drag going both directions, it must be very close to right
[04:09:19] <skinnypuppy34> jk bout the margaritas
[04:09:28] <toast> oh i finished those up hours ago
[04:09:31] <toast> i'm back to sober now
[04:10:14] <SWPadnos> if you get reasonably even finish when using a flycutter, then the head is trammed nicely
[04:10:28] <cradek> yeah, I do
[04:10:37] <toast> on the table?
[04:10:43] <SWPadnos> ideally not
[04:10:46] <cradek> ha
[04:10:52] <skinnypuppy34> woo hoo . I'm just greasy. Been measuring for brackets pulleys
[04:11:01] <toast> the flycutter is dragging on the table, right
[04:11:02] <toast> not the part?
[04:11:33] <cradek> no I mean when I use it in either direction I get full circles
[04:12:15] <toast> o
[04:13:39] <cradek> what would you call the stone you use to remove burrs from the table etc?
[04:13:43] <skinnypuppy34> Yep everyonce in a while after some heavy flycutting I'll see the trailing edge taking a skim cut....
[04:13:44] <cradek> does it have a name?
[04:14:47] <skinnypuppy34> cradek from what I understand they are prepped by blocking flat atop a surface plate with some sandpaper. Don't know the stone name
[04:16:51] <toast> cradek: i have often asked that question, and nobody seems to know
[04:16:59] <toast> flatstones?
[04:17:13] <toast> yep, flatstones
[04:17:53] <cradek> hmm
[04:17:55] <skinnypuppy34> I bought a scraper from this guy on ebay... that is great quality if anyone is looking for some
[04:17:56] <skinnypuppy34> http://cgi.ebay.com/AUTOMOTIVE-TOOL-MAKER-MACHINIST-CARBIDE-SCRAPER-1-000_W0QQitemZ290172286487QQihZ019QQcategoryZ42337QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
[04:18:00] <cradek> where to get one then
[04:18:48] <toast> http://www.airbearings.com/pricelist?PHPSESSID=f96eb3fb4098dfb60ad39273749dc0d3
[04:18:53] <toast> look at the very bottom, last one
[04:18:59] <toast> 250 bucks from PI
[04:19:04] <toast> and PI makes good crap
[04:19:10] <cradek> eek
[04:19:37] <skinnypuppy34> holy cow
[04:20:33] <skinnypuppy34> http://www.brownells.com/aspx/NS/store/ProductDetail.aspx?p=6708&title=GESSWEIN+RUBY+STONES
[04:20:34] <toast> ....?
[04:21:06] <skinnypuppy34> I'm not used to 250$ stones toast
[04:21:09] <toast> oh
[04:21:40] <skinnypuppy34> ;o)
[04:27:49] <tomp> roundstone, 2 roughnesses, mfctr is Bear looking for one now, cheap maybe 1 bucks, use it to clean machine table surface, and bottom of moulds before laying it down
[04:28:51] <toast> http://www.ablap.com/
[04:28:55] <toast> you might consider ablap
[04:29:15] <toast> i met the guy who owns it, he's real nice and his customers are real positive about them
[04:29:24] <toast> might be better for your application than a flatstone
[04:30:19] <SWPadnos> hey - they're about 50 miles from me
[04:31:19] <SWPadnos> wel, 75 if you have to drive on the roads and avoid mountains and stuff
[04:31:22] <SWPadnos> well
[04:37:03] <fenn> superfinishing by hand whats what
[04:37:22] <fenn> oh crap, i reserved that book at the library and havent picked it up yet
[04:37:45] <tomp> bear was bought by norton, norton is owned by Saint-Gobain thier roundstone is avaialble at J&L so likely at any machinists supply house http://www.jlindustrial.com/ADZ-01024A/SEARCH:CATEGORY/product.html
[04:38:10] <tomp> that is not as nice as the old bear's ( red stones ) but comes under the name 'diebrick'
[04:39:18] <fenn> i had a small alumina triangle stick that came with a pocket knife.. worked very well for final honing
[04:44:57] <tomp> / maybe 10 bucks, / maybe 20 bucks the big groove and 6" diameter make it nice to clean the table and work
[04:46:27] <tomp> wow, coarser and smaller and more expensive
[05:04:51] <fenn> so why is this better than an old grinding wheel that i've flattened?
[05:05:21] <toast> ?
[05:05:43] <toast> stones have a much finer grit than grinding wheels are available in
[05:06:11] <toast> and don't break down
[05:06:14] <toast> like a wheel does
[05:14:07] <toast> toast is now known as toastydeath
[07:32:55] <toast> fff
[08:06:43] <alex_joni> http://learning.dtpm.unipa.it/emc/it/demo.htm <- that's nice :)
[12:43:42] <Guest905> Guest905 is now known as skunkworks_
[12:44:52] <Guest905> Guest905 is now known as skunkworks_
[13:21:39] <Guest905> Guest905 is now known as skunkworks___
[16:04:37] <alex_joni> hmm I tried gutsy live the other day.. works like a treat
[16:11:22] <tomp> norton ( the grinding wheel / norbrite stick people ) and Granfors Bruks both sell an 'axe sharpening' roundstione that would be good for cleaning burrs/removing bumps from work table and parts
[16:11:42] <CIA-8> 03alex_joni 07TRUNK * 10emc2/src/emc/task/emccanon.cc: add centripetal accel constraint for helix/arc, separate axial and circular vel/accel for helixes (might have the chance of faster circles if the machine has different max speeds/accels)
[16:11:51] <tomp> it's not as large a diameter as the old Bear tool but is 'hand sized' at 3" dia.
[16:13:39] <tomp> cradek: here it is, the old Bear stone for tables & workpieces ( not listed in Nortons catalogs ) http://www.sharpeningsupplies.com/Norton-4-x-1-Round-Combination-India-Stone-P148C8.aspx
[16:14:10] <cradek> thank you!
[16:15:44] <SWPadnos> man. one of those and a whole lot of patience could be a really good thing :)
[16:17:44] <tomp> the art of removing the bump... until it fades into the larger flat surface
[16:17:48] <cradek> tomp: you think 4" is big enough?
[16:18:34] <tomp> i seemed to recall a 6" but they dont list larger, you gotta let it lay flat and not tip it
[16:18:43] <skunkworks_> flattening your table?
[16:18:51] <tomp> and not let it rock at the edge
[16:18:52] <tomp> yeah
[16:18:53] <SWPadnos> un-dinging :)
[16:18:58] <skunkworks_> ah
[16:18:59] <cradek> yeah
[16:19:05] <cradek> seems like bigger would be better
[16:19:35] <skunkworks_> I think dad has used red brick.. :)
[16:19:49] <skunkworks_> and a nice oil slurry
[16:19:53] <SWPadnos> for some reason that doesn't sound too precise
[16:20:03] <tomp> big figure 8 sweeps, up/down, then l/r then diagonals, yep an arkansas red stone on the nice side
[16:20:32] <tomp> and cleran it by popping it off a clean oiled surface, pulls all the dirt out
[16:20:38] <tomp> clean
[16:21:01] <SWPadnos> nah - take it to the high pressure car wash :)
[16:22:30] <jlmjvm> has anyone seen these motors http://www.surpluscenter.com/item.asp?UID=2007062621461319&item=10-2351&catname=
[16:23:14] <cradek> no, but looks interesting
[16:23:35] <SWPadnos> I have a similar ametek from them. there are no specs, so I can't tell you what it is
[16:23:46] <jlmjvm> i think skullworks sent me the link awhile back
[16:23:54] <skunkworks_> or skunkworks? ;)
[16:24:11] <jlmjvm> was it you
[16:24:11] <skunkworks_> maybe it wasn't you.
[16:24:12] <cradek> there's an extra wire they say not to use - wonder if it's some kind of tach
[16:25:25] <tomp> it sez ackside had a stub end of shaft and mounting holes for 'sensor'. i suspect no tacho/encoder on this unit
[16:26:04] <tomp> nice to have the dbl ended shaft
[16:26:53] <jlmjvm> save a lot of work
[16:28:28] <cradek> click the "more photos" tab
[16:29:25] <SWPadnos> that's an awfully small shaft back there
[16:31:26] <jlmjvm> im sure us digital has 1 that will work on that dia
[16:32:14] <jlmjvm> im just wondering if it has a skewed armature
[16:33:39] <jlmjvm> skewed rotor
[19:55:23] <fenn> am i the only person who thinks g10 is backwards? i'd expect to move the machine to some point and then define the current location in the part coordinate system
[19:55:42] <fenn> rather than defining the part coordinate system origin in the current coordinate system
[19:55:51] <alex_joni> * alex_joni abstains from g10-related discussions :)
[19:55:59] <fenn> and what's that L2 for anyway
[19:56:11] <alex_joni> so it doesn't get mixed up with L1
[19:56:36] <fenn> is l1 documented somewhere or am i just blind?
[19:56:50] <alex_joni> no, I think rs274ngc doesn't use it
[19:57:24] <fenn> (Set current offset to zero)
[19:57:43] <fenn> well, that's what i was trying to do, but the general case is set current offset to (xyz)
[19:59:40] <fenn> um, no, nevermind
[19:59:53] <fenn> its easy to misinterpret this stuff
[20:31:19] <CIA-8> 03alex_joni 07TRUNK * 10emc2/src/emc/task/emccanon.cc: harmless comment to clarify the usage of some variables
[20:45:21] <CIA-8> 03cradek 07TRUNK * 10emc2/src/emc/task/emccanon.cc: fix comment
[23:08:01] <tomp2> this is cool, i got pcmcia wifi to work :) Dlink DWL-G650
[23:13:08] <skunkworks> tomp: what did you use? I ended up using fwcutter.