#robotics Logs

Jun 14 2014

06:53 test432525 hello
07:04 password2 hi
10:20 rue_bed if you ever buy a fan with a plastic blade, and want it to last a while, take the blade out and balance it when its new
10:21 rue_bed I was working on a fan last night I been regreasing for a while, turns out one side of the shaft is quite worn out from the inbalance
10:21 rue_bed not the first fan motor I'll have to make a new shaft for
10:22 rue_bed they tend to be REALLY badly out
10:23 rue_bed you would think the bronze bushings would wear out first
10:23 rue_bed I have collected some really awesome stepper motors from the printers being stripped donw
10:24 rue_bed I want to build robot arms, too bad I dont want to use steppers on them anymore
11:14 password2 heh
11:14 password2 i've been wondering what i would use a lathe for , i have been drooling for one for a while
11:17 billmania password2: And what did you decide?
11:19 password2 nothing
11:20 password2 i would love to have one , but I'm afraid that i won't use it often enough to justify the cost
11:21 password2 Well i will probably use it a few times for chain mailling
12:03 password2 mmm , making gears on a lathe seems relativly easy
13:03 MrCurious Fotbol!
13:35 GuShH lol making gears on a lathe easy...
13:36 GuShH the guy clearly never attempted it, just watched a video or two.
13:36 GuShH sure watch videos and assume it's all easy and didn't take a whole day.
13:37 GuShH first you need to figure out your indexing, based on that you have to figure out the math involved relative to your index gear ratio, then make the custom cutter for your gear, then machine your gear blanks (yes plural, you'll fuck up) then build a fixture, even for hobbed gears you need a fixture with a rigid shaft and holder. for conventional gears you'd want a milling vise and another type of fixture/jig
13:38 GuShH then there's the matter of actually holding the cutting tool.
13:38 GuShH figuring out the correct depth, because it'll take multiple passes and you don't want your teeth to have different depths, so a depth stop is required, or keeping count of your dial micrometers.
13:39 GuShH then of course, the material... if it's mild steel, it'll take even longer to make. and you'd want to harden it once it's made
13:39 GuShH of course, just like threading, if your tool sucks, your result will suck.
13:40 ShH has hobbed gears, but didn't care to machine any other type of gear on a la
13:47 GuShH http://gushh.net/tmp/dscn5375f.jpg
14:33 gartt GuShH: Looks good enough to sell
14:46 GuShH gartt: if only china would use that simple rule
14:47 GuShH made a small batch for friends and such, they're oil quenched. I decided not to use a direct extruder though.
17:55 MrCurious GOAL!
17:57 Tom_itx FOUL!
17:58 Tom_itx GuShH, that sorta looks familiar
17:59 GuShH Tom_itx: it's for repraps
17:59 GuShH I must have showed a link to a place that sold those
17:59 GuShH because they boasted "gunblue finish" and it was just an oil quench
17:59 GuShH like I did
17:59 GuShH no, they said "gunmetal finish"
17:59 ShH chuc
17:59 Tom_itx i sorta figured that out
17:59 Tom_itx http://tom-itx.no-ip.biz:81/~webpage/reprap/drive3.jpg
18:00 Tom_itx been down that road
18:00 GuShH I'm not going to be using a direct extruder on 3mm anyway
18:00 Tom_itx http://tom-itx.no-ip.biz:81/~webpage/reprap/drive5.jpg
18:00 GuShH I reamed mine
18:01 GuShH they look a bit too deep, did they work well?
18:01 GuShH I followed a plan I found and for 1.75 it's not as deep
18:01 Tom_itx never used em
18:01 GuShH different tap used though I went for 55� withworth
18:02 ShH sh
18:02 GuShH me neither. I changed my mind.
18:02 Tom_itx i really had no intention to
18:03 Tom_itx it was a 'see if i can' thing
18:03 GuShH Working on a die holder now
18:03 GuShH still trying to figure out the morse taper deal...
18:03 Tom_itx mine was pure guesswork
18:03 GuShH I can do small tapers fine, but not the longer morse tapesr
18:03 GuShH tapers*
18:03 GuShH and I guess I could make a morse taper attachment, but that's a lot of work
18:04 GuShH you have to disengage the nut, figure out a way to mount it, etc
18:04 GuShH that means 2 gibs adjustments in my case
18:04 GuShH any ideas?
18:04 GuShH shy of "cnc it"
18:04 Tom_itx :)
18:04 GuShH I would, but I don't have another lathe currently to keep manual
18:05 Tom_itx offset your live center
18:05 Tom_itx you'd have to be pretty accurate with it though
18:09 GuShH Tom_itx: but having to center it again is also a pain!
18:09 GuShH and I'm not sure it's worth machining out of mildsteel
18:09 GuShH the 1010 stuff can barely be hardened
18:09 GuShH machinability is about 50-55% which sucks, but it's all I can source
18:10 GuShH it actualy machines fine, but it tends to have a few hard spots
18:10 GuShH so the finish is crap.
18:11 GuShH Tom_itx: your mill was fully converted, or are you working on it?
18:12 Tom_itx it's cnc
18:13 Tom_itx i updated it recently though
18:13 Tom_itx bigger steppers, bigger psu and new drivers
18:14 Tom_itx still a tiny mill but performs much better than it did
18:14 GuShH I thought 1 inch dies were 1 inch, this one isn't... it flops about the 1 inch hole I bored for the holder
18:14 ShH shakes
18:15 GuShH Tom_itx: much better than no mill
18:15 GuShH I need something bigger though, I guess I don't have the balls to buy another chinese machine
18:17 GuShH They're projects, not machines
18:19 GuShH yesterday I had to remake the part I did the other day, for the gearbox shaft... because the old nut stripped the new part (just like it stripped the original part) so I made also a new nut, this one is massive by comparison and instead of threading 1010 or turning a bolt I just used an M6 allen head screw... sick of tripped threads.
18:19 GuShH the original nut was too thin, and would flop about the banjo I think that allowed it to cross-thread twice
18:20 GuShH (I often have to flip the main gears to go from metric to inch threading)
18:20 GuShH I set the gaps with paper, so it takes about a minute to flip them, except when something breaks.
18:21 GuShH that's why I think an older lathe like yours is much better, if you take good care of them they'll last forever
18:21 GuShH good materials to start with
18:22 GuShH I suspect the spindle bearings might be shot, seals are gone, it spews out the grease, I think rue's are also doing the same
18:22 GuShH except he noticed shiny bits floating on the oil/grease it was dripping... which is even worse
18:23 GuShH Is it Honda? No... Hong Da http://mla-s2-p.mlstatic.com/fresadora-vertical-hong-da-oportunidad-15784-MLA20108484171_062014-F.jpg
18:23 GuShH Hahaha
18:25 GuShH DongGuan HongDa Industrial Machinery CO.,LTD
18:25 GuShH No it's actually Jiangyin Hongda Powder Equipment Co., Ltd
18:25 GuShH Instead of Power they registered as Powder....
18:25 GuShH no comment.
18:31 MjrTom lol
20:59 GuShH rue_more: hmmm that's a nice 4 jaw, although a bit small http://members.optushome.com.au/terrybrown/FourJaw.html
20:59 GuShH it's true the original one sucks big time
21:31 rue_more heh
22:45 Edes anyone participating on senior WRO?
22:46 ace4016 wro?
22:50 ace4016 world robot olympaid
22:50 ace4016 i'm too old for that :P
23:41 GuShH ace4016: wouldn't the robots have to do all the olympic stuff?
23:42 ace4016 yea, but i can't enter a robot that i buidl
23:42 ace4016 i'm too old of a creator
23:42 GuShH oh noes
23:42 GuShH you could say it's just you from the future, the robot brought you.
23:44 ace4016 lol
23:46 GuShH http://members.optusnet.com.au/moreshedstuff/BallTurner4.html
23:56 Jak_o_Shadows Uh, what use is a round steel ball?
23:57 GuShH mostly handles
23:57 GuShH but also ball-socket joints
23:57 Jak_o_Shadows Hmm. With ball and socket joints, how do you go about actually actuating that joint?
23:59 GuShH depends what it's for, there are ball and socket joints on my magnetic indicator base for example :p
23:59 GuShH You could mimic nature otherwise.