#linuxcnc | Logs for 2012-12-05

[01:52:58] <Loetmichel> mornin'
[02:04:52] <DJ9DJ> moin
[08:53:09] <mazafaka> Can you give the best article on 'types (materials of which they are made) of the end mill bits'
[09:42:02] <Jymmm> LOL http://www.rowetel.com/blog/?p=2381
[09:45:50] <mazafaka> lol
[10:47:47] <alex4nder> how's it?
[10:48:45] <archivist> hoe does one select it from the set of things
[10:48:49] <archivist> how
[10:57:38] <Jymmm> They never came back? I'm *SO* surprised... http://sfbay.craigslist.org/sby/zip/3456911340.html
[12:12:20] <IchGuckLive> hi all B)
[12:13:36] <IchGuckLive> today the Xmas hoooro startet 2nd day Yesterday broke a bit and milled into part today PC with CAM smoked off in a nice scene
[12:14:28] <IchGuckLive> the Fan started to blow and gaint speed ,and then smoke out of the PC
[12:15:00] <IchGuckLive> Monitor no signal and then silance
[12:23:55] <pcw_home> the rest is silence
[12:24:11] <IchGuckLive> :D
[13:25:56] <andypugh> I am struggling to summon up the enthusiasm to go into my cold workshop
[13:27:42] <archivist> here it could be warmer than indoors
[13:28:27] <andypugh> We had veery nearly an inch of snow here, and carnage ensued.
[13:29:22] <archivist> just cold here no snow, nearly an inch that is HUGE
[13:30:00] <archivist> beats me how the loons fail in the snow
[13:31:50] <andypugh> To be fair, it was probably more than an inch, and it packed down into a very icy mess (being barely below freezig)
[13:31:52] <archivist> learning to drive in slippery conditions should be compulsory
[13:33:00] <andypugh> There is only so much you can do if you have a BMW, Mercedes or Jaguar with wide tyres and rear wheel drive. I have seen them doing all the right things many times, and still unable to do anything but slide down the camber.
[13:35:22] <archivist> I have never tried that sort of car in the snow, except for a mk4 cortina maybe
[13:37:13] <archivist> but usually I spend some time each winter trying out the car I have at the time, balls of fun
[14:12:20] <icee> even in just wet conditions, having a high power-to-weight ratio and rear wheel drive can be inadvertently exciting
[14:12:36] <icee> few millimeters of offset where you want the accelerator to be and where your foot actually puts it...
[14:21:04] <andypugh> My transport this morning was rear-wheel drive and 1000hp per ton. in the snow. It wasn't a great deal of fun.
[14:22:05] <JT-Shop> your bicycle?
[14:22:36] <andypugh> The R1
[14:23:45] <andypugh> (It's technically only 1000hp per ton until I fill it with fuel and park weighty carcase on top)
[14:23:53] <JT-Shop> I used to make my own studded tires for my C-50
[14:25:06] <andypugh> I am seriousy considering getting a set of ice studs for the GasGas. I kept a worn set of knobblies back for the purpise.
[14:26:29] <JT-Shop> that's what I did, put some wood screws into knobbies
[14:27:52] <JT-Shop> wow it has wheelie control "Not much has changed with the 2012 R1, but the big news is it now has a six-stage traction control system, incorporating anti-wheelie in its two most intrusive levels."
[14:27:54] <andypugh> I was looking at http://www.kirktownmachinery.co.uk/maxi-grip/maxigrip-racing-ice-studs-hm11/
[14:28:26] <JT-Shop> cool
[14:48:30] <icee> kwallace: You're not the kim that works with me are you? :P
[14:49:16] <kwallace> Sorry, No, I'm Kirk
[14:49:38] <icee> ah ;)
[14:49:50] <icee> just was strange
[15:40:07] <L84Supper> andypugh: is that vehicle very light or did you drive one of these to work today? http://en.wikipedia.org/wiki/Top_Fuel
[15:40:54] <icee> L84Supper: it's a motorcycle
[15:41:03] <L84Supper> figured :)
[16:14:42] <tjb1> Long day over yet?...no
[16:24:36] <andypugh> L84Supper: 180hp. 180kg.
[16:28:49] <adb> light plane ?
[16:30:56] <tjb1> JT-Shop: Ill fix the rest of the pictures eventually…too much work at the moment
[16:31:08] <DJ9DJ_> gn8
[16:54:18] <mevon> hello, Im glad to report that my implementation of ChibiOS in an arduino to Servo control L296N three steppers is making progress, I can now control 1 axis with no lag or f-error
[16:54:44] <tjb1> Anyone have any idea why my Z stalls when doing a rapid but not when doing a G1 move? Would it be that its trying to reach the max velocity too quickly versus reaching whatever feed I have set?
[16:55:24] <tjb1> I think it has something to do with my THC and then suddenly trying to move up since it is not working correctly but I don't think I have enough time/want to try lightening the Z up this weekend.
[16:57:05] <andypugh> tjb1: Stepper torque reduces with speed. You probably need to drop the axis max velocity
[16:57:20] <tjb1> I believe its at 2 but I will check
[16:57:59] <tjb1> I really want to keep my accel up because the touch off works much better then but have to do what works.
[16:58:21] <andypugh> Accel probably isn't the problem.
[16:58:41] <andypugh> But max velocity might be. A G0 move tried to move at the axis max-velocity
[16:59:22] <tjb1> Alright, thanks
[17:05:05] <lwizardl> hellow
[17:05:11] <lwizardl> oops hello
[17:05:19] <andypugh> Hi
[17:06:07] <lwizardl> what application in linux would be good for designing out say a laptop case or similar layout to be later routed out using a mill
[17:07:08] <tjb1> CAD?
[17:07:18] <andypugh> FreeCAD maybe.
[17:07:25] <tjb1> Draftsight is Linux right?
[17:07:43] <tjb1> http://www.3ds.com/products/draftsight/download-draftsight/
[17:07:45] <andypugh> Yes, but only 2D
[17:08:32] <Valen> you can run rhino in wine (mostly)
[17:08:35] <Valen> ;->
[17:08:38] <andypugh> http://sourceforge.net/projects/free-cad/
[17:09:54] <andypugh> Of the ones I have tried, Free-CAD is closest to working.
[17:10:53] <andypugh> I have Alibre (paid for) and Autodesk Inventor (home license via work) for Windows. Both are a bit better, but Free-CAD is good enough to design parts with.
[17:11:33] <andypugh> Given that Inventor is about $8000 you can't complain too much.
[17:11:37] <Valen> hey andypugh hows stuff?
[17:11:44] <andypugh> Cold.
[17:12:42] <andypugh> I have been out in the workshop trying to figure out the bldc component (the idiot who wrote it disn't document it very well, and there is no clue how to configure it for Resolvers)
[17:13:02] <lwizardl> cool thanks andypugh. I have a couple things I want to create and have made
[17:13:28] <Valen> umm andypugh wasn't it you who wrote it?
[17:13:36] <andypugh> :-)
[17:13:42] <Valen> uh huh ;-P
[17:14:08] <Valen> dang nabbit why is brushless so much more expensive
[17:14:47] <andypugh> There are some very cute NEMA 17 brushless motors on eBay at the moment. But they have no encoders.
[17:15:12] <andypugh> However, encoders are available as an accessory, so might be worth looking at.
[17:15:18] <Valen> I want moar powah!
[17:15:20] <andypugh> (for a little teeny machine)
[17:15:44] <Valen> that and most ebay sellers only ship via UPS super duper express which is like $400 to .au
[17:16:20] <Valen> this is what I'm talkin about http://www.ebay.com.au/itm/1-pcs-NEMA34-Brushless-DC-Motor-/120603303302?pt=LH_DefaultDomain_0&hash=item1c14845d86&_uhb=1#ht_918wt_1165 ;->
[17:17:22] <andypugh> Cute liittle motors: http://www.ebay.com/itm/350586486139
[17:18:25] <Valen> think that peak or cont torque?
[17:19:45] <andypugh> Continuous. But in oz-in for bigger numbers
[17:20:14] <Valen> thats fairly respectable i spose
[17:20:20] <Valen> what are you using to drive them?
[17:20:23] <icee> that seems expensive
[17:20:41] <Valen> theres a bigass box on the back of them, sure theres no encoder?
[17:21:05] <Valen> and 2 cables
[17:24:29] <andypugh> I asked the vendor. He says no encoder.
[17:24:56] <Valen> then whats the second box?
[17:25:05] <andypugh> Hall sensors?
[17:25:06] <andypugh> http://www.pittmanexpress.com/ecatalog/brushless-dc-motors/en/brushless-dc-motorsA0422052NC-NAXX-SP
[17:25:14] <andypugh> Is the same motor, with the encoder.
[17:25:27] <Valen> looks pretty dern similar
[17:25:58] <andypugh> But they are tiny. Maybe good for a little 3D printer for jewellry masters (my thoughts)
[17:28:12] <andypugh> Valen: Have you seen http://www.dmm-tech.com
[17:29:06] <andypugh> US$556 for a 750W motor + Dyn3H drive to suit (LinuxCNC compatible)
[17:29:27] <Valen> yeah you mentioned them before
[17:29:40] <andypugh> They seem friendly :-)
[17:29:47] <Valen> peak torque is in the same region as the kelig ones
[17:30:01] <Valen> for much cheaper
[17:30:11] <andypugh> That price includes the drive.
[17:30:15] <andypugh> Does Keling?
[17:30:23] <Valen> even if you include the drive
[17:30:34] <andypugh> Which Keling deive?
[17:30:36] <andypugh> (drive)
[17:30:42] <Valen> mesa drives
[17:31:38] <andypugh> Well, the DMM takes mains power input, which helps. Have you priced low ESR 600V caps?
[17:31:51] <Valen> I was using a kelig psu
[17:32:12] <Valen> big hunk of iron and copper
[17:32:22] <Valen> ~80v i was going to run
[17:32:43] * Loetmichel stirs his ramen with bacon bits... wife is travveling again for her company... :-(
[17:32:49] <Valen> lol
[17:33:08] <Valen> dude for me that means fish in a garlic lemon sauce served on a bed of brown rice
[17:33:14] <Valen> (missus doesn't like fish)
[17:33:26] <Loetmichel> hrhr
[17:33:34] <Loetmichel> mine doesent like garlic ;-)
[17:34:05] <Valen> actually there was no hurhur in there, (i'm pretty sure she "goes fishing" when she is out though ;-P)
[17:34:16] <andypugh> My ex-gf was mutton/lamb averse
[17:34:19] <Valen> doesn't like garlic? dump the woman get a new one
[17:34:21] <Loetmichel> the bigger problem: without my "biological alarm clock" i have some problem waking up in the morning ;-)
[17:34:32] <Valen> she is obviously defective
[17:34:34] <ds3> is there any recommendation on a low priced, EMC2 compat (or min. work) spindle motor setup?
[17:34:51] <andypugh> What sort of spindle motor?
[17:34:55] <Valen> depends on what you mean by comptible with emc
[17:35:05] <ds3> 1/4HP
[17:35:14] <ds3> can be a bit more
[17:35:30] <Loetmichel> ds3: any motor which vfd has a 0-10V input
[17:35:36] <ds3> would be nice to have S/M03/M04 commands
[17:35:49] <ds3> Loetmichel: anyone selling motor + electronics to do that?
[17:36:00] <ds3> current motor is less then happy
[17:36:04] <Valen> I am hoping to hook up one of those chinese spindles by rs485 soon
[17:36:08] <Loetmichel> ans some small electronics which cam make a PWM to a voltage
[17:36:30] <ds3> so EMC prefers to output a PWM?
[17:36:40] <Valen> emc doesn't really have a preference
[17:36:42] <Loetmichel> IIRC yes
[17:36:47] <Loetmichel> it can
[17:36:54] <Valen> but it can do PWM out
[17:36:55] <Loetmichel> not prefers
[17:36:58] <ds3> but it is easier to setup emc to output pwm?
[17:37:07] <ds3> vs say a SPI controlled or I2C controlled DAC?
[17:37:24] <Loetmichel> ds3: why bother wit a dac?
[17:37:31] <Loetmichel> pwm is much more simple
[17:37:32] <Valen> I try to avoid analog stuff
[17:37:49] <Valen> I'd say PWM is easier than all that mucking about yes lol
[17:37:54] <ds3> don't really care... trying to see how much it'd cost for a simple solution
[17:38:24] <ds3> I can either fix my current DC motor w/manual controls or try to fit in a automatically (EMC) controlled setup
[17:38:35] <Loetmichel> ds3: any motor with a VFD with 0-10V inputs can be used for PWM
[17:38:45] <Valen> if you have a chinese spindle with VFD controller you can get a 485 (or whatever it is) chip for the spindle for a few $ and a usb > 485 dongle from deal extreme for a few more $
[17:38:53] <Loetmichel> you just need some Resistors, caps and a Operational amplifier
[17:38:58] <Loetmichel> its really simple
[17:39:14] <andypugh> In many cases the resistor and cap is all you need.
[17:39:18] <Valen> I'd use a fet and a cap and a resistor, no amp ;->
[17:39:25] <Valen> if he can tune to 0-5v
[17:39:26] <ds3> Loetmichel: who sells one cheap? small 3PH motors seem rare
[17:39:45] <Loetmichel> most of the time you can power the circuit even from the VFD, which normally has a 15V output
[17:39:55] <Valen> http://www.ebay.com.au/itm/2-2KW-WATER-COOLED-MILLING-AND-GRINDING-SPINDLE-MOTOR-WITH-2-2KW-INVERTER-VFD-r2-/390375010406?pt=AU_B_I_Electrical_Test_Equipment&hash=item5ae429f066&_uhb=1
[17:39:56] <Loetmichel> ds3: china
[17:40:00] <ds3> for a bigger setup, VFD + 3PH motors are easy
[17:40:03] <Loetmichel> i have a watercooled one
[17:40:08] <Valen> thats actually rather cheap
[17:40:17] <Valen> we paid almost $600 for our last one
[17:40:20] <ds3> 2KH? that is like 1.5HP
[17:40:31] <Valen> KW's are bigger than HP's
[17:40:31] <ds3> look for sub 1hp
[17:40:31] <Loetmichel> http://www.cyrom.org/palbum/main.php?g2_itemId=12506
[17:40:43] <Loetmichel> 800W for less than 300 Eur
[17:40:47] <Valen> ~3HP
[17:40:59] <ds3> the mechanical parts won't handle 3HP
[17:41:11] <ds3> and I don't want to be around when the parts go flying
[17:41:29] <Valen> you don't need to push that hard
[17:41:39] <ds3> can I limit power with the VFD?
[17:41:41] <Valen> I think the most we have ever had it up to was 5A
[17:41:47] <Valen> probably best not to
[17:41:50] <Loetmichel> ds3: there are NO parts that are going to floy
[17:41:57] <andypugh> But for $5 you can use this circuit with any VFD: http://www.linuxcnc.org/index.php/forum/30-cnc-machines/25580-grizzly-g1006-milling-machine-cnc-conversion?lang=english#25670
[17:41:57] <Valen> http://www.ebay.com.au/itm/NEW-DIY-CNC-Router-0-8KW-800W-Spindle-Motor-1-5kw-Inverter-Drive-Driver-Kit-/121032655271?pt=LH_DefaultDomain_0&hash=item1c2e1bc1a7&_uhb=1#ht_5638wt_1398
[17:42:04] <ds3> Loetmichel: this is for a Taig mill... very small machine
[17:42:20] <Loetmichel> ... exept the mill bit shards and the workpiece
[17:42:26] <Valen> too much spindle power is not a problem I have ever heard people complain of
[17:42:30] <Loetmichel> ds3: NOT smaller than mine:
[17:42:45] <Loetmichel> http://www.cyrom.org/palbum/main.php?g2_itemId=12569
[17:43:08] <Valen> http://www.ebay.com.au/itm/NEW-DIY-CNC-Router-0-8KW-800W-Spindle-Motor-1-5kw-Inverter-Drive-Driver-Kit-/121032655271?pt=LH_DefaultDomain_0&hash=item1c2e1bc1a7&_uhb=1#ht_5638wt_1398
[17:43:16] <Valen> ~1HP
[17:43:20] <Loetmichel> http://www.cyrom.org/palbum/main.php?g2_itemId=12578
[17:43:35] <ds3> Loetmichel: hmmm that came from ebay?
[17:43:40] <Loetmichel> Valen: 1.5kW is more loke 2 HP
[17:43:51] <Loetmichel> ds3: the Motor? yes
[17:43:51] <Valen> 1.5 VFD .8motor
[17:43:52] <ds3> 800W is a bit over 1HP, IIRC
[17:43:53] <andypugh> That link of mine (which got rather lost in the URL flood) can be fitted into the cable, or at the VFD. Just solder components to the chip legs.
[17:44:02] <ds3> andypugh: I like your link
[17:44:13] <ds3> let me find out what package that chip is in
[17:44:21] <Valen> though as far as I'm aware these vfd's don't take in 0-10v
[17:44:23] <Valen> ?
[17:44:32] <Loetmichel> Valens link is exactly mine
[17:45:07] * Valen bets the only difference in the vfd power outputs is how much steel they pack in the back of the controller to make it feel heavier
[17:45:18] <ds3> SOIC... I like
[17:45:19] <Loetmichel> andypugh: right: i said it isnt much work ;)
[17:45:29] <ds3> I rather not deal with ebay
[17:45:35] <ds3> but I'll look into that
[17:45:44] <Loetmichel> Valen: no, the smaller ones have a smaller heatsink-fan ;-)
[17:45:46] <ds3> Loetmichel: how much was it?
[17:45:53] <andypugh> That circuit isolates the P-port (or Mesa/Pico) PWM from the VFD control voltage. The voltage the VFD sees is a proportion of it's own control voltage. As far as the VFD s concerned, it sees something like a potentiometer.
[17:46:04] <Loetmichel> ds3: less than 300 eur for spindle AND VFD
[17:46:16] <ds3> andypugh: I assume it takes advantage of the slow response of the isolator to do some filtering?
[17:46:33] <ds3> Loetmichel: hmmm that's like $500 US.
[17:46:37] <Loetmichel> ds3: no, The RC does the filtering
[17:46:38] <andypugh> No, that's the cap and resistor.
[17:46:47] <Loetmichel> ds3: $400 more likely
[17:46:55] <Valen> the one i posted was in $au which is ~= $us atm
[17:47:20] <Loetmichel> but germany tends do be a bit more expensive than .us
[17:47:36] <andypugh> The only important point is that that particular Opto is a Totem-pole output, so it sinks current when off, and sources when on. A typical Opto doesn't.
[17:49:01] <ds3> Loetmichel: is it a PM DC motor or 3PH?
[17:49:09] <andypugh> 3P
[17:49:21] <Valen> do be aware too though that many parallel ports wont push enough current for many optos
[17:49:50] <Loetmichel> 3ph
[17:50:10] <ds3> that is a very close race with a sherline motor
[17:50:22] <ds3> guess it comes down to which one can be wired up easier
[17:50:49] <Loetmichel> andypugh: ... abd the opto has a Cmos output rather than TTL so it can cope with the 15V ;-)
[17:52:10] <andypugh> That chip needs typically 2.2, max 5.5 mA current. I did look very long and hard for the exact right chip.
[17:53:05] <andypugh> (it can actually handle 25V on the output side)
[17:53:13] <Valen> thats a pretty nice chip
[17:53:41] <ds3> doesn't silabs make similar isolators?
[17:56:59] <andypugh> I wonder if it is worth getting a batch of PCBs made up and flogging PWM to VFD convertors on that eBay. I reckon I coulf make $5 or $6 a week.
[17:59:07] <jdh> I'll pay us$10 for one (shipped)
[18:00:21] <Tom_itx> a guy in #avr does pcbs from china
[18:00:29] <Tom_itx> pretty reasonable
[18:03:09] <andypugh> I have used Seeed. They would charge $10 for 10 boards, and cheaper for more.
[18:03:31] <ds3> hmm
[18:08:01] <Loetmichel> andypugh: woha! a whopping $6? GO for it!
[18:08:18] <andypugh> So far I am impressed. Quality is good. You get resist and screen print and plating. It beats making them yourself by a huge margin if you can wait 10 days. http://www.seeedstudio.com/depot/fusion-pcb-service-p-835.html?cPath=185
[18:08:55] <Loetmichel> hmm.
[18:10:12] <ds3> if you are doing a PCB, can you throw in pads for a reverseing relay?
[18:10:17] <Loetmichel> i hve some local PCB manufacturers wich make a 100*160mm 2 layer card with gold and resist for about $50. and 10 pcs for about $100
[18:10:33] <andypugh> I might do it anyway, just because there doesn't seem to be anything out there simple and cheap enough.
[18:10:36] <Loetmichel> much more expensive but faster
[18:11:10] <Loetmichel> ds3: reversing ralay?
[18:11:11] <andypugh> ds3: And suddenly we have feature-creep....
[18:11:13] <Loetmichel> for what?
[18:11:15] <ds3> andypugh: if you have provisions for a relay, I'd be interesting in buying one
[18:11:26] <ds3> Leotmichel: I am seeing cheaper DC motors
[18:11:38] <ds3> andypugh: no need to install it...just pads
[18:11:41] <Loetmichel> the VFD have 2 inputs for CW and CCW
[18:12:04] <ds3> trying to confirm that the sherline DC motor unit takes 0-10V.. if so, it just needs a relay and I have it all
[18:12:07] <Loetmichel> and / or a "run" and a " Direction" input
[18:12:11] <ds3> and it is like $230USD
[18:12:23] <andypugh> ds3: Transistors are fine for Fwd-Rev
[18:12:36] <ds3> andypugh: eh?
[18:12:48] <ds3> thinking of for/rev by swapping the polarity to the motor
[18:12:57] <ds3> you'd need a H bridge, wouldn't you?
[18:13:07] <andypugh> So, centre-off relay?
[18:13:11] <ds3> DPDT
[18:13:30] <ds3> the chipitself is easy enough to debug...
[18:13:34] <ds3> SOICs are nice like that
[18:13:38] <ds3> to deadbug I mean
[18:14:51] <ds3> andypugh: www.sherline.com/reverse.htm
[18:15:27] <andypugh> Anyway, What power is that Sherline spindle?
[18:15:36] <ds3> around 1/4hp
[18:15:54] * Loetmichel gets the cramps whenever one modifies such a DC drive that way
[18:16:16] <Loetmichel> i dont like power PWM to a motor get switched.
[18:16:47] <Loetmichel> tends to burn the switch contacts AND burn the transostors in the control
[18:16:47] <andypugh> I know you _think_ you only want 125W, but as someone else said, nobody has _ever_ complained of too much spindle power.
[18:17:10] <Valen> whoever said that was awesome
[18:17:25] <Loetmichel> ds3: the 800W 3pha watercollend can be EASILY stopped with a 1/2" mill bit
[18:17:27] <Valen> 125w crap thats less than a dremel\
[18:17:30] <andypugh> Too much noise, too much vibration, yes.
[18:17:32] <ds3> I have a 1/4hp spindle right now
[18:17:47] <Loetmichel> so i wont like a 120W spindle on a mill :-)
[18:17:50] <ds3> Loetmichel: I've stopped a 3/4" bit with a 2hp spindle before
[18:18:06] <ds3> note - my spindle can only do 1/4" cutters anyways
[18:18:07] <Loetmichel> thats what i meant
[18:18:08] <Tom_itx> andypugh i've used seeed in the past as well
[18:18:46] <Tom_itx> how big is the board?
[18:18:55] * Loetmichel also fritcion-welded a TC 1/8" bit to the vice accidentally ;)
[18:18:57] <andypugh> My 2hp spindle at lowest speed (47 rpm) is probably capable of hauling in the moon. I have no idea what that speed range is for.
[18:19:02] <Tom_itx> laen does $5/sq in for prototypes
[18:19:23] <Loetmichel> andypugh: threading?
[18:19:31] <andypugh> Tom_itx: This would be about 1"2
[18:19:32] <ds3> andypugh: for those 20diameter cutters in tool steel ;)
[18:19:36] <ds3> 20"
[18:19:52] <andypugh> Loetmichel: It's a mill
[18:19:54] <Valen> doing weird stuff
[18:20:09] <JT-Shop> http://s307.beta.photobucket.com/user/BrianRupnow/media/CONTINUATION%20OF%20MAIN%20ALBUM1/SAWMILLDRIVENBYWEBSTER.mp4.html
[18:20:15] <Valen> we use our lathe at that sort of speed to centrifugally cast things
[18:20:16] <JT-Shop> http://s307.beta.photobucket.com/user/BrianRupnow/media/CONTINUATION%20OF%20MAIN%20ALBUM1/SAWMILLDRIVENBYATKINSON.mp4.html
[18:20:20] <andypugh> With the VFD I can use the spindle as a clock :-)
[18:21:22] <Loetmichel> s/thrading/tapping
[18:21:24] <Loetmichel> better?
[18:21:32] <ds3> you sure trust the clocks on your PC ;)
[18:21:43] <andypugh> 47 rpm. Not 47 rps..
[18:22:33] <ds3> looks like indeed the sherline can take a 0-10V signal
[18:23:02] <andypugh> JT-Shop: http://social.ford.com/your-ideas/technologies/green/inverted-atkinson-cycle-in-ford-ecoboost-engines/
[18:25:00] <Tom_itx> andypugh would that interface to an exhisting sherline control?
[18:25:17] <JT-Shop> cool
[18:25:37] <Tom_itx> guess i showed up late to the party :(
[18:25:57] <andypugh> Ford either have, or are about to have, an Atkinson engine in production.
[18:26:33] <andypugh> Tom_itx: Would _what_ interface to a Sherline?
[18:26:43] <Tom_itx> your little circuit
[18:27:13] <ds3> apparently the sherline is a rebranded KBIC controller
[18:27:13] <andypugh> I can't see why not. It is basically a straight replacement for a potentiometer.
[18:27:24] <Tom_itx> nonstocked at mouser
[18:27:41] <ds3> if you're not doing a PCB, I might just dead bug something
[18:27:52] <ds3> and speghetti wire in a dpdt relay
[18:28:05] <andypugh> KBIC contollers float the pot at +DC bus V (120V) but that's OK with that opto.
[18:28:21] <ds3> yep, I like the isolation
[18:28:29] <Tom_itx> $3.63 @ dk
[18:28:42] <ds3> finding a decent isolator is was a stopper for using the sherline control
[18:28:53] <ds3> but motor + controls $230 w/o ebay is a plus
[18:29:02] <jdh> I looked for a DPDT relay for my spindle. Couldn't find one rated for inductive loads that high
[18:29:16] <jdh> well, not for reasonable $$
[18:29:56] <skunkworks> http://bbs.homeshopmachinist.net/threads/54157-Ethernet-Motion-Controllers
[18:30:02] <ds3> if the spindle is required to be stopped, why would it need to be inductively rated?
[18:30:18] <andypugh> Tom_itx: http://www.alliedelec.com/search/productdetail.aspx?SKU=R1093788
[18:30:31] <Tom_itx> i found it at digikey
[18:30:58] <Tom_itx> 0 can ship immediately
[18:31:05] <andypugh> That's good, as I just noticed that Allied is zero-stock :-)
[18:31:25] <Tom_itx> 199 at dk
[18:31:33] <jdh> I was thinking about spindown time, but I wanted it for rigid tapping so I guess it would spin down almost instantly
[18:32:06] <ds3> don't rigid tapping require an encoder on there as well?
[18:32:13] <jdh> yes
[18:32:18] <Tom_itx> index
[18:32:32] <ds3> I'd love to rigid tap but Z axis is a bit limited
[18:32:43] <ds3> always thought of doing a stepper controlled spindle for tapping
[18:32:50] <Tom_itx> i'd like to try it on the sherline
[18:33:02] <ds3> Tom_itx: u have a sherline?
[18:33:05] <Tom_itx> yes
[18:33:23] <ds3> Tom_itx: do you have the spindle controlled via S and M03/M04 codes?
[18:33:50] <andypugh> skunkworks: PCW really ought to be able to clean up with the 7i80 + Mach.
[18:35:26] <Tom_itx> ds3, i put a ss relay on it
[18:35:34] <Tom_itx> no reverse
[18:35:42] <ds3> on a different thing - how bad of an idea is a dual processor PIII-800MHz for EMC?
[18:35:49] <ds3> Tom_itx: so no speed control either?
[18:35:50] <Tom_itx> speed is manual via the pot
[18:35:58] <ds3> I see
[18:36:09] <Tom_itx> i'm hoping this would replace that pot
[18:36:23] <ds3> Ooooh
[18:36:36] <Tom_itx> then i need a reversing relay
[18:38:02] <Tom_itx> i haven't poked around in it yet
[18:39:07] <jdh> I paid like $50 for my pwm->V speed control from cnc4pc
[18:39:37] <Tom_itx> reverse?
[18:39:55] <jdh> has relay for reverse, but it is signal only
[18:41:10] <ds3> Tom_itx: are you using 1 or 2 parallel ports?
[18:43:33] <Tom_itx> 1 with a 7i43
[18:48:47] <andypugh> 7i43 is cool. Much under-rated in the 5i25 era
[18:49:21] <Tom_itx> well i got it just before the 5i25 release or i may not have it now :)
[18:50:50] <jdh> <me too>
[18:52:31] <andypugh> It's got a lot more pins that a 5i25
[18:53:00] <JT-Shop> say goodnight Gracie
[18:59:53] <skunkworks> andypugh: there have been work on the 5i20 - but nothing seems to be happining
[19:01:14] <andypugh> Do you mean 5i20?
[19:07:28] <Tom_itx> andypugh what did you use that opto on?
[19:08:13] <andypugh> Hitachi VFD and 5i23.
[19:08:31] <Tom_itx> ceramic cap ok?
[19:08:50] <Tom_itx> that would be a pretty small board layout
[19:09:01] <andypugh> (though it is now redundant, as I bought a 7i49)
[19:09:27] <andypugh> Yes. Mine is on a 6x6 dot bit of vero board.
[19:09:28] <Tom_itx> what's the 49 do?
[19:10:05] <andypugh> 7i49 is a 6 resolver / 6 analogue out board
[20:46:46] <Jymmm> This REALLY does work at fixing christmas lights http://www.lightkeeperpro.com/
[20:49:32] <andypugh> So, how?
[20:50:04] <Jymmm> andypugh: Click on "How it works"
[20:50:20] <Tom_itx> ok board drawn up
[20:51:11] <andypugh> Ah, OK, it properly shorts the failed bulbs.
[20:51:13] <Jymmm> It's saved me grief for two years now.
[20:52:03] <Jymmm> But, DO remove the batteries each year
[20:52:16] <andypugh> I save myself grief by not having any such lights.
[20:52:25] <Jymmm> Sucks to be you
[20:53:03] <Jymmm> or do you have LED now?
[20:53:37] <andypugh> My family do christmas, I don't have to.
[20:54:25] <Jymmm> andypugh: Ok, Eb.
[21:02:10] <Tecan> whats uP*
[21:02:49] <Tecan> whats uP *<*
[21:02:55] <jdh> North
[21:06:29] <Jymmm> {rice of Tea in China
[21:06:32] <Jymmm> P
[21:08:00] <Tecan> heh you guys have too much time on your hands :)
[21:08:38] <Jymmm> µP
[21:08:59] <icee> Z
[21:09:14] <Jymmm> Ω
[21:09:42] <icee> S
[21:10:02] <Jymmm>
[21:10:04] <Jymmm> π
[21:10:20] <icee>
[21:10:32] <icee> mo' mho
[21:11:00] <Jymmm> icee: ¡ǝɯ ɹoɟ ןooɔ ooʇ ʇsnظ ǝɹɐ noʎ
[21:11:28] <icee> i'm just talking about mho/siemens
[21:11:37] <icee> because everyone like siemen