#robotics Logs

May 23 2014

00:02 GuShH hrmm all the used live centers have their tips entirely rounded off almost to a big sphere, instead of a 60� point
00:02 GuShH people don't know how to use them properly
00:02 GuShH they only use the tip and shove it in... which is not how you use a live center... specially not a dead center.
00:03 ShH shakes
00:03 Hyratel1 GuShH, ew
00:03 GuShH some have terrible wear "rings" (grooves) that make them unusable without grinding the points
00:04 GuShH probably from stock not being round and them forcing the center to "make it so"
00:04 GuShH well not round, I mean true.
00:04 GuShH ie bent
00:04 Hyratel1 how would you properly go about that
00:04 GuShH or maybe just excessive load and wear
00:04 Hyratel1 truing warped stock
00:05 GuShH mechanically or by hand
00:05 GuShH there are machines just for that purpose
00:05 Hyratel1 is the proper method for using a live center to drill a shallow pilor hole in the center of the end of the stock
00:06 GuShH no, it has to drill past the pilot and provide the 60� (if that's what you're using) shoulder
00:06 Hyratel1 oh. would you use a 60% countersink bit for that?
00:06 Hyratel1 60*
00:06 GuShH the center bits already have the right profile
00:07 Hyratel1 ah
00:07 Hyratel1 wasn't aware there was a tool specially for that
00:08 GuShH the pilot hole also serves as a pocket to hold the lubricating oil when you're using dead centers
00:08 GuShH (it also clears the point, as it shouldn't be in contact with anything)
00:09 Hyratel1 the point is just a result of making the slope come to the center?
00:09 GuShH right it's just a taper
00:09 GuShH it self centers
00:10 Hyratel1 does the reccomended depth of the center cup depend on the length/weight of the stock on the lathe?
00:10 GuShH and the shoulders (in the "countersink") provide enough surface area to keep it properly centered even when there are side forces involved
00:10 GuShH you use the center drill size according to your stock size
00:11 GuShH smaller stock requires less surface area in general
00:11 GuShH but of course, there are machine limitations and you also don't have every possible center size there is
00:11 Hyratel1 gotcha
00:12 ShH likes his 3.15mm centers for up to 1 inch rod --- there ought to be a guideline on this, somewh
00:12 GuShH at any rate I don't understand how people break their center drills
00:12 rue_more ok I got togethor a fet driver for the power supply
00:12 rue_more or selected technically
00:12 GuShH it must be they try to push them past the 60� shoulder?
00:13 GuShH or they try to do it all in one fast operation without clearing the chips? wrong speed?
00:13 rue_more 60?
00:13 GuShH centers are typically 60 degrees
00:13 rue_more oh I see yea
00:13 rue_more past the shoulder?
00:13 rue_more break them off?
00:13 rue_more material not bolted properly?
00:13 rue_more dull/fractured bit?
00:13 GuShH well the center drill won't have any way to clear the chip if you get past that point, I don't think
00:14 GuShH very fancy live centers come with replacable tips... of many kinds... and nice wooden boxes...
00:14 ShH dr
00:14 Hyratel1 a center drill dorens't have a slot through the shoulder i take it?
00:14 GuShH it has two "flutes"
00:14 Hyratel1 looking more like a countersink?
00:14 GuShH unless it's old school or homemade (ie like a spade or flat reamer)
00:15 GuShH http://upload.wikimedia.org/wikipedia/commons/d/df/CenterDrills123456.jpg
00:15 GuShH they should actually still clear the chips... but why would you go past that 60� portion?
00:16 GuShH and damn, the good quality big ones are rather expensive
00:21 GuShH half inch ones are about 100 bucks here, of course I don't have a use for those.
00:22 MrCurious rue_more: http://www.ebay.com/itm/181408398105?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
00:22 MrCurious i think it will work with saleae software
00:39 rue_more damnit
00:39 rue_more its true
00:39 rue_more no dvr records with mroe than 480L of resolution
00:39 GuShH you too looking at dvrs?
00:39 GuShH for cctv
00:40 rue_more so we been selling 700tvl cameras with 480tvl recorders at work
00:40 GuShH LOL
00:40 rue_more FFFFFFFFFFFFF
00:40 rue_more I'm gonna tear a strip of our supplier
00:40 rue_more nowonder the images are so crappy
00:41 rue_more this will be why the landfills images look so good, they are just using a mux
01:36 theBear "I'm a scientist ... I can wire anything into anything !"
09:11 SquirrelCZECH_ what would you suggest to create dxf from "picture made by scanning the part"
09:13 SlaveToTheSauce i think people usually end up tracing them manually with splines/curves in blender or something
09:13 rue_more theBear, I have an organic lifeform that I need to be recharged electrically?
09:14 SquirrelCZECH_ yeah
09:14 SquirrelCZECH_ SlaveToTheSauce: so, what would you use?
09:14 uirrelCZECH_ doesn't know a thing in ble
09:14 SquirrelCZECH_ ")
09:14 SlaveToTheSauce i would probably end up writing my own software to do it in c
09:15 SlaveToTheSauce or perhaps find another cad package that allows you to overlay a scaled bitmap
09:15 uirrelCZECH_ is opening his 180Mb i=
09:16 SlaveToTheSauce in theory you could do automated processing like taking the laplacian of the image and automagically creating lines or curves from that
09:17 SlaveToTheSauce but it would take a lot of tuning and inconsistent shading would probably fuck it up
09:17 SquirrelCZECH_ hmm
09:17 uirrelCZECH_ is going to rotate it into vertical nad make it practically black/w
09:17 SlaveToTheSauce yeah thresholding might work also
09:18 SquirrelCZECH_ high resoluion image and I count on he part that they used "normal" measures
09:18 SquirrelCZECH_ you can guess that holes are 50mm from each other and not 4.9996 :)
09:37 SquirrelCZECH_ ok
09:37 SquirrelCZECH_ maybe 10000x18000 picture was not so awesome idea
09:37 SlaveToTheSauce yeaaah most software doesn't handle that shit particularly well
09:39 SlaveToTheSauce eh that's only half a gigabyte, what's the problem?
09:39 SquirrelCZECH_ :D
15:58 SlaveToTheSauce http://i.imgur.com/j4z61uI.jpg attn GuShH
16:09 GuShH SlaveToTheSauce: At least I've got the tools, instead of the toys. I'll take the former any day.
19:44 RifRaf SquirrelCZECH_, did you sort out your bitmap tracing issue?