#linuxcnc | Logs for 2013-08-17

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[00:20:56] <Xfriend> I want to make a program to control my cnc machine with g code what information should I need to use ?
[00:23:20] <ReadError> uh
[00:23:26] <ReadError> just install linuxcnc?
[00:24:05] <lwizardl> hello
[00:24:08] <Xfriend> I'm using mac
[00:24:22] <ReadError> Xfriend: then use some reprap crap
[00:24:39] <ReadError> i got 3 macs, but i also have a dedicated cnc box
[00:25:38] <Xfriend> I have a ramp 1.4v
[00:25:46] <ReadError> well tbh man
[00:25:50] <ReadError> this isnt the place
[00:25:54] <Xfriend> I was looking for info to do try that
[00:26:00] <ReadError> try #reprap
[00:26:27] <Xfriend> I asked and they send my to this channel
[00:26:29] <Xfriend> :D
[00:26:36] <lwizardl> I was wondering is there would be a way to allow the cnc machine to switch tools for switching to different cut needs?
[00:38:10] <NickParker> Xfriend: if you have a ramps board that's wholly #reprap's domain
[00:38:14] <NickParker> I know, i frequent both
[00:38:23] <NickParker> lwizardl: Yep, toolchangers.
[00:39:20] <nspiel_> use arduino with the ramps 1.4 and get sprinter or marlin firmwire
[00:39:39] <nspiel_> configure it for what u what to do and control it with another program like pronterface
[00:42:36] <Xfriend> nspiel yes but only for cnc machine
[00:43:21] <lwizardl> NickParker: cool time to check google. also do you know of any cnc compatible perforating tool for making folds for like boxes?
[00:44:19] <NickParker> Nope no idea about perforating
[00:44:36] <lwizardl> k
[00:50:32] <nspiel_> go to the reprap wiki they will show u how
[00:50:37] <nspiel_> or reprap channel on here
[00:51:59] <nspiel_> does motorsense need to be connected in order to get the feedback? dont you just need encoders and motor pwm
[02:54:41] <mrsun> hmm maybe mount the leadscrew today =) my first ballscrew! =) the question is tho, will i run it in direct drive to the motors or will i use 1:4 or so "gearing" ? :/
[02:57:39] <awallin> what motor do you use
[03:03:31] <mrsun> 1.85Nm motors atm, but gonna buy stronger for it later
[03:03:41] <mrsun> when i can afford it :P
[03:04:15] <t12> cutting a v-slot with a chamfer tool: sane?
[03:05:02] <awallin> tilt the workpiece instead and cut with an endmill
[03:07:13] <t12> turns a 1 axis tilt into a two axis tilt
[03:07:28] <t12> (on a bridgeport)
[03:07:33] <t12> i suppose thats not so bad
[03:20:11] <DJ9DJ> moinsen
[05:29:32] <DJ9DJ> re
[07:14:09] <Lathe_newbie> do i need a encoder with index vor tapper cutting on an lathe?
[07:14:16] <Lathe_newbie> or is a+b enough?
[07:14:41] <archivist> you need the index
[07:15:21] <archivist> a+index on the spindle is good enough
[07:16:29] <Lathe_newbie> why is a+b not possible? if i know the number of counts i have?
[07:16:37] <archivist> the carriage remains stationary till it sees the index
[07:17:41] <Lathe_newbie> isent it possible, to du a virtual index?
[07:17:52] <Lathe_newbie> to do
[07:18:33] <archivist> I have seen talk of virtual index but not seen any implementation yet
[07:20:52] <Lathe_newbie> oke...
[07:20:59] <Lathe_newbie> so i need to get a new encoder
[07:24:04] <archivist> I saw something being pushed into the source in the last few days, I would say virtual index is coming for certain applications like resolver
[07:35:41] <Lathe_newbie> thx for info
[07:42:00] <pdurbin> is http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Screenshots sort of the main "gallery" of what people have made?
[07:44:36] <awallin> pdurbin: I'd say that's only a small part of what people have built and controlled with linuxcnc
[07:45:27] <pdurbin> yeah, I bet
[07:47:03] <awallin> try youtube with "emc2" and "linuxcnc" also if you want more examples
[07:47:52] <pdurbin> awallin: wow. cool. thanks
[07:55:00] <archivist> methinks pdurbin will be kept quiet for an hour or two on youtube :)
[07:57:22] * pdurbin watches Home made 5-axis LinuxCNC mill - YouTube - https://www.youtube.com/watch?v=b7cjo4kTYMw
[07:58:12] <pdurbin> archivist: heh. lots of videos on the tools themselves. I'm also curius about the final projects. the stuff that's made by the tools
[07:59:20] <archivist> lurk in here you find most of us making stuff will post pics...or it didnt happen
[08:00:11] <pdurbin> heh. sure. but a gallery would be nice too :)
[08:00:13] <archivist> ew the grinding noises from that mill
[08:00:33] <archivist> and rattles
[08:01:11] <pdurbin> yeah
[08:01:18] <archivist> glad there is no sound on my vids !
[08:01:45] <pdurbin> :)
[08:04:54] <archivist> what does/can/should happen is users add links to their own galleries and blogs
[08:06:12] <pdurbin> sure. that would work. oh. "does happen"? are the links collected somewhere?
[08:07:11] <archivist> spread around the wiki
[08:07:24] <pdurbin> hmm. ok
[08:08:09] <archivist> like this page http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Case_Studies
[08:09:45] <pdurbin> archivist: ah. perfect. thanks!
[08:15:54] <archivist> pdurbin, some of the stuff gets announced on the user mailing list, usually when a machine gets some kind of upgrade
[08:23:30] <pdurbin> archivist: ah, ok. thanks
[08:25:34] <archivist> we all have our own differing methods, some are very quiet and bashful and dont say what they make
[08:26:32] <pdurbin> :)
[08:27:50] <archivist> if you want examples of a particular type of operation/method ask and we may know where an example lurks
[08:29:19] <pdurbin> sure. makes sense. again, I'm kind of interested in the final product. the thing you would sell or give to friends
[08:32:15] <archivist> iirc ReadError makes that sort of thing
[08:35:30] <ReadError> make what?
[08:46:32] <archivist> gifts by cnc
[09:23:08] <blossom> hi
[09:26:50] <pdurbin> ReadError: pics or it didn't happen ;)
[09:28:09] <blossom> do i've realistic chances to get linuxcnc up & running on MC68332 or MC68360 based CNC?
[09:28:30] <blossom> (without more than 6 months of pain)
[09:28:51] <archivist> less pain by putting an intel board in
[09:29:12] <blossom> archivist: okay, or a RPi?
[09:29:37] <archivist> use beagle bone black
[09:29:46] <awallin> rpi has been done, but there are more powerful arm boards
[09:29:46] <blossom> okay
[09:30:15] <archivist> but its only just coming into use by the developers
[09:32:40] <blossom> so i need a cute AMD64 or beagle bone black and a couple of SSI interfaces (maybe in software via GPIO?) and DAC
[09:33:24] <archivist> what are you thinking of controlling
[09:33:27] <blossom> + ADC for "monitoring"
[09:33:38] <blossom> an old cnc machine
[09:34:51] <archivist> "machine" covers rather a lot
[09:34:52] <blossom> archivist: driven by "analog servo amplifiers"
[09:35:17] <archivist> mill lathe etc?
[09:36:30] <blossom> mill
[09:36:41] <archivist> servo systems mostly use intel and a mesa card for servo control with hardware encoder counters in the mesa fpga
[09:37:20] <blossom> okay, i'll check mesanet.com
[10:51:46] <jdh> anyone know of any existing code for avrs or anything that does programmable stepgen pulsing for testing/etc?
[10:52:22] <Jymmm> jdh: google "avr stepper"
[10:52:41] <jdh> I've done that, never found anything good
[10:53:12] <jdh> most of them use the avr as the driver
[10:56:00] <Jymmm> http://extremeelectronics.co.in/avr-tutorials/stepper-motor-control-avr-tutorial/
[10:56:07] <jp_> what about arduino?
[10:56:27] <jdh> arduino would be fine also.
[10:56:48] <jp_> tons of stepper code out there for arduinos
[10:57:31] <jdh> stepper drivers.
[10:58:14] <jdh> I'm just looking for pulse gen. I can do direction with a switch. I could probably just write it faster than finding something.
[10:58:32] <archivist> two switches
[10:58:45] <jp_> and fast fingers
[10:58:53] <jdh> heh, that's what I want to avoid.
[10:59:04] <archivist> actually one switch and a signal generator
[10:59:16] <jdh> momentary +/- buttons, pot for speed. toggle for direction.
[10:59:25] <archivist> 555
[10:59:27] <jdh> or a generic signal generator.
[10:59:44] <archivist> generic when I last did that
[11:00:33] <archivist> or was it the pulse gen.... whatever was nearest and did 5v square wave
[11:02:07] <andypugh> I think I would use a PC + parport + stepgen. Known-to work systen and in the corner of the room
[11:02:21] <andypugh> Or an Arduino
[11:03:14] <archivist> so today two generated bevels rolled against each other :)
[11:03:14] <jdh> I've been using my Mill PC, but I have to swap connectors and the kb/monitor are really too far away
[11:03:31] <archivist> get moooore wire
[11:04:08] <Tom_itx> go wireless :)
[11:04:42] <archivist> wireless is useless for parallel port wires
[11:04:44] <Tom_itx> jdh, if you want avr code for steppers use the marlin reprap stuff
[11:04:54] <Tom_itx> archivist, i know
[11:04:58] <jdh> I Contour jog shuttle thing I can barely reach that works, but, still is a pain for switching.
[11:05:35] <jdh> http://arduino.cc/en/Tutorial/DueSimpleWaveformGenerator
[11:05:46] <jdh> that looks workable
[11:05:56] <Tom_itx> i wrote an avr stepper program just to step steppers for testing once
[11:06:10] <Tom_itx> nothing fancy
[11:06:46] <Jymmm> http://www.ebay.com/itm/backlight-LED-DDS-Function-Signal-Generator-Sine-Square-Sawtooth-Triangle-Wave-/190844915876?pt=LH_DefaultDomain_0&hash=item2c6f3e50a4
[11:07:05] <Jymmm> http://www.ebay.com/itm/New-DDS-Function-Signal-Generator-Module-Sine-Square-Sawtooth-Triangle-Wave/281151972902?rt=nc&_trksid=p2047675.m1851&_trkparms=aid%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D163%26meid%3D634898183474225083%26pid%3D100005%26prg%3D1088%26rk%3D1%26rkt%3D4%26sd%3D190844915876%26
[11:10:42] <Jymmm> jdh: http://www.ebay.com/itm/Stepping-Motor-Speed-Regulator-Reversible-Direction-CW-CCW-Stepper-NEW-/221172555228?pt=LH_DefaultDomain_0&hash=item337ee95ddc
[11:12:02] <Jymmm> jdh: has videos too
[11:12:07] <jdh> I'll see about making one tonight.
[11:13:58] <andypugh> I have one of those. (In fact we used it at Wichita). Money well spent.
[11:15:52] <jdh> now I need a laser cutter so I can make a small enclosure for it.
[11:15:56] <Jymmm> For that price, beats maikng one yourself with display, housing, and terminals
[11:16:35] <jdh> true, but I already ordered a different one.
[11:16:48] <Jymmm> in the last 5m ?
[11:16:54] <jdh> yeah
[11:17:11] <Jymmm> cancel it?
[11:17:25] <jdh> buy-it-now
[11:17:53] <Jymmm> ah
[11:18:14] <jdh> I would have preferred screw terminials to BNC, but I have a lot of old scope cables.
[11:18:55] <Jymmm> you bought a DDS ?
[11:20:40] <Jymmm> I've never seen this micro mill before... http://www.ebay.com/itm/Proxxon-MF70-cnc-conversion-kit/221239478939?_trksid=p2047675.m2109&_trkparms=aid%3D555003%26algo%3DPW.CAT%26ao%3D1%26asc%3D142%26meid%3D635107540481117479%26pid%3D100010%26prg%3D1076%26rk%3D3%26rkt%3D15%26sd%3D221172555228%26
[11:21:55] <Jymmm> Hmmm http://www.ebay.com/itm/PROXXON-37110-MICRO-MILLING-MILL-MF70-CNC-KIT-AVAILABLE-/350272259912?pt=LH_DefaultDomain_0&hash=item518dda8748
[11:24:25] <Jymmm> http://www.proxxon.com/en/micromot/27110.php?list
[11:25:17] <Jymmm> Heh, they even have a pantograph option for it =)
[11:25:47] <Lathe_newbie> archivist: you told, virtual index is possible, but why not use it?
[11:27:02] <pcw_home> probably should be added to the encoder comp but someone needs to be volunteered to do it
[11:28:18] <Lathe_newbie> pcw_home: so its not possible atm?
[11:28:45] <andypugh> Proxxon seem to be German (or were). They make a lot of tiny tools.
[11:29:04] <Jymmm> ah
[11:29:11] <pcw_home> Its entirely possible, but probably the best way would be to add it to the encoder comp
[11:29:39] <Jymmm> andypugh: Only thing is the largest collet is 3mm, I'd like at least .250"
[11:29:47] <Lathe_newbie> pcw_home: could a mesa card do it?
[11:30:16] <pcw_home> It could but I would not bother
[11:30:41] <andypugh> It would be a fairly simple custom component too. Just a modulo divider
[11:31:07] <pcw_home> Yeah but then you have all that funny index enable stuff
[11:31:46] <andypugh> It would need to run in the base thread and output a pin to connect to the encoder module index-input pin.
[11:31:50] <Lathe_newbie> cause i have a few encoders with no index, but they could become perfect mounted on my lathe
[11:34:33] <roycroft> folks - i don't machine ss often so i'm not sure if i should tackle this
[11:34:44] <roycroft> at the moment i only have a 7x12 mini-lathe available
[11:35:04] <roycroft> i need to cut a 1/4" mpt on the end of a piece of 1" square 304 ss
[11:35:08] <roycroft> is that feasible?
[11:35:29] <andypugh> Lathe_newbie: http://pastebin.com/70SV1vHF
[11:36:05] <andypugh> roycroft: "mpt" ?
[11:36:12] <roycroft> male pipe thread
[11:36:13] <roycroft> sorry
[11:36:24] <roycroft> a common abbreviation on this side of the pond
[11:36:29] <andypugh> I would not anticiapate any trouble at all.
[11:36:58] <roycroft> i should use a carbide tool, yes?
[11:37:22] <andypugh> No particular reason to, it's only 304.
[11:37:32] <roycroft> ok
[11:37:36] <roycroft> again, i rarely machine ss
[11:37:43] <andypugh> Surface speed wants to be fairly low.
[11:37:55] <andypugh> And keep the tool cutting.
[11:38:02] <roycroft> yes, i do remember to go slow and use a fairly aggressive cut
[11:38:18] <roycroft> it starts out hard and work hardens easily
[11:38:26] <pcw_home> I guess a fancier comp could have a force index pin so you
[11:38:27] <pcw_home> could manually re-align if re-starting linuxcnc
[11:39:34] <roycroft> it's only 1" square, so it won't be that expensive to buy a longer piece than i need in case something goes awry
[11:39:46] <roycroft> i only need to fabricate three pieces with this thread
[11:40:07] <roycroft> thanks
[11:40:19] * roycroft gets back to the design
[11:40:28] <andypugh> Lathe_newbie: It would be better to supply an index. It does not need to be part of the encoder. It could be a proximity sensor looking at the spindle keyway, or a bolt, or a driled hole, or an opto looking at a paint mark or a slot switch or a magnetic reed relay or a magnet and a hall switch.
[11:42:54] <archivist> Lathe_newbie, one slot is extended on mine http://www.collection.archivist.info/archive/DJCPD/PD/2013/2013_08_04_starturn_encoder/IMG_1631.JPG
[11:43:07] <archivist> simple optos
[11:44:16] <pcw_home> or if you use the synthetic index you could allow one time
[11:44:18] <pcw_home> manual alignment
[11:44:19] <pcw_home> offset <= scale - (rawcounts % scale)
[12:23:22] <IchGuckLive> B)
[12:36:11] <IchGuckLive> all milling around the world !
[12:48:49] <IchGuckLive> nice saturday here in germany lotsa of good stuff out of the plasmas today
[13:33:24] <Mikegg> Is it possible to use inactive stepgen outputs as GPIO with the 7i76?
[13:35:17] <pcw_home> As outputs, sure
[13:36:18] <pcw_home> but not as inputs (since the signals from the FPGA go through a buffer that points out)
[13:41:43] <Mikegg> awesome. Having some trouble figuring out which hal pins to use. Is it hm2_5i25.0.gpio, or hm2_5i25.0.7i76.0.0 ....
[13:42:14] <Mikegg> stepgen 3 is not in use, so he uses pins 20-24 on the card.
[13:43:00] <Mikegg> looking at dmesg.... I think that's going to be hm2_5i25.0.gpio.006, 7, 8, 9
[13:43:26] <Mikegg> but I thought the 5i25 pins were off limits because that's back and forth between the 7i76
[13:48:50] <awallin> step/dir and gpio are probably just buffered on the 7i76
[13:55:16] <pcw_home> Yes the 7I76 just has step/dir buffers to give 5V and differential outputs
[13:57:37] <pcw_home> the GPIO would be hm2_5i25.0.gpio
[13:58:49] <pcw_home> anything with 7I76 in the name is field I/O (connected via sserial)
[14:00:02] <Mikegg> ah, ok
[14:31:05] <pcw_home> if you dont use the sserial expansion you have another differential input and output availabe
[14:31:06] <pcw_home> and if you dont use the encoder pins, they are available as TTL or differential inputs
[14:42:57] <quitte> I did the first productive drilling. Of course now I have more questions.
[14:44:01] <quitte> How do you guys do the manual tool change? I messed up pretty much every time. Counting the times I messed up twice it probably was more than every time
[14:44:37] <quitte> especially doing the G92 on the Z axis at the right moment was a huge problem
[15:08:58] <andypugh> quitte: G92? That's not the normal way to do it.
[15:44:28] <archivist> did someone want to cnc a spinning lathe 181197277534
[15:44:35] <quitte> andypugh: sorry was afk. what would be the normal way to put the bottom of the tool at zero of the workingpiece?
[15:45:06] <andypugh> G10
[15:45:13] <andypugh> What GUI are you using?
[15:45:20] <quitte> axis
[15:45:30] <andypugh> The touch-off button then
[15:46:00] <andypugh> I assume you don't have a toolholding system with repeatable tool length?
[15:46:07] <quitte> okay. i'll push it the next time it asks for a tool change and hover over f1
[15:46:48] <quitte> andypugh: no. but it's mostly drills at the moment. I guess I could drill into a piece of plastic
[15:47:41] <andypugh> Right. You can't _really_ use more than one tool in the same program if you don't have a repeatable tool length.
[15:48:16] <andypugh> But, if it is a drill chuck and all the drill can be inserted to the very back of the chuck, or to an end stop, then you could program the tools into the tool table.
[15:48:24] <archivist> unless you have measuring built in
[15:48:42] <andypugh> Yes, unless you have a tool-length probe.
[15:49:07] <andypugh> Is you G92 being called by the G-cde then?
[15:49:17] <quitte> i already push the last mm of the drill in by the z-axis before fixating.
[15:49:46] <quitte> andypugh: no. I stopped the program. did the G92 and then searched for the line to continue at manually
[15:50:09] <andypugh> Right. This is how I do it.
[15:50:28] <quitte> the program was generated by pcb-gcode
[15:50:59] <quitte> which is great but creates stupid drill paths :/
[15:51:13] <quitte> it could finish in a quarter of the time, easily
[15:51:17] <andypugh> Put the tool in, jog the tool to close to the work surface, take a broken 6mm end mill (of which I have too many) and then jog the tool _up_ until the end-mill rolls under.
[15:52:09] <andypugh> You now know that the tool is 6mm above the surface. Then press the "touch off" button in Axis and tell it that the tool height is now 6mm.
[15:52:43] <Loetmichel> andypugh: i do the same with a sheet of paper
[15:52:58] <andypugh> What the "Touch off" button really does is a G10. And you can choose whether it moves the current coordinate system or re-programs the tool table in a drop-down list inside the dialog box.
[15:53:17] <Loetmichel> just the other way round: stepping 0,02mm down until the paper is stuck
[15:53:38] <Loetmichel> then i know that the tool is 0,1mm above surface
[15:53:44] <quitte> what is supposed to be the z-axis zero?
[15:53:56] <andypugh> Loetmichel: I got the jogging up until a rod slides under idea from JT. It seems less likely to go wrong than jogging (down?) to a sheet of paper.
[15:54:26] <andypugh> quitte: Z-axis zero is whatever you want it to be. But typically it is the top of the work, with all cuts being to negative Z.
[15:54:35] <Loetmichel> andypugh: you mean: "shi*, another TC mill bit broken because of wrong jog step"?
[15:55:06] <andypugh> Loetmichel: Yes.
[15:55:25] <Loetmichel> happens
[15:55:28] <Loetmichel> seldom
[15:55:51] <andypugh> Actually, the new mill has a probe, and a drawbar, and BT30 tools. I hope to be able to offline-measure now.
[15:55:58] <Loetmichel> i use TC mill bits down to 0,3mm with 3mm cutting lenght
[15:56:29] <Loetmichel> there i would not risk to press a shaft sideways into the tool
[15:56:40] <Loetmichel> they thend to break a bit tooo easily
[15:57:19] <archivist> I tend to cut something then measure as touch off is way out when in mid air
[15:57:49] <andypugh> You don't "press", you roll it gently against the side of the tool. Though I would be nervous about a TC measuring tool and a tiny TC cutter. I might want to use a softer rid there.
[15:58:06] <archivist> and I want the centre line of the tool not the tip length
[15:59:00] <archivist> I need all three to line up http://www.collection.archivist.info/archive/DJCPD/PD/2013/2013_08_11_bevel/IMG_1633.JPG
[16:00:08] <Loetmichel> with engraving bits i sometimes stet the zero intenionally about the cutting deptz above the surface and start the program
[16:00:20] <Loetmichel> and see if it does make marks
[16:00:42] <Loetmichel> if not: stop and a few hundrdets deeper
[16:01:03] <archivist> similar to me I set the cutter off the work and adjust after a cut
[16:01:10] <andypugh> archivist: That's an interestingly non-cartesian 5-axis.
[16:01:10] <Loetmichel> if it makres marks then i stop again and offset for the cutting depth
[16:01:27] <archivist> andypugh, the bevel gear generator
[16:02:19] <andypugh> Looks like a job for specially made casting :-)
[16:02:28] <archivist> only the Z sits around on this job
[16:03:11] <andypugh> Do you have any video of it in action? What sort of bevels does it make?
[16:03:23] <archivist> at the moment I cannot think how kins would help me, but it might
[16:04:14] <archivist> this kind of bevel http://www.collection.archivist.info/archive/DJCPD/PD/2013/2013_08_16_bevel/ straight
[16:04:58] <archivist> no video as that camera has a broken screen
[16:05:18] <archivist> and it takes 3 hours...boring
[16:06:07] <archivist> tomorrow I shall setup and make the matching pinion
[16:07:27] <archivist> the A (smaller rotary) has to be rotated to the pinion angle and the tip of the stock got in line with the B axis
[16:08:11] <andypugh> Noce to know I am not the only long-fingernailed freak :-)
[16:08:23] <sharpen047> hey guys im looking to add a low power laser to my 3 axis cnc. just wondering how people usually go about powering the laser with gcode control. arduino i heard is a good choice but i cant find any information about it.
[16:08:47] <archivist> so for general purpose I need another rotary and ay under the A on top of the B
[16:08:58] <andypugh> sharpen047: Do you need variable voltage output?
[16:09:30] <archivist> andypugh, that pic and minor damage made me get the wet and dry to said nail
[16:10:13] <sharpen047> andypugh: not sure, i dont have a laser yet. just looking to engrave wood or similar at the moment.
[16:10:37] <quitte> sharpen047: building a direct exposer?
[16:10:38] <andypugh> Just wondering what the Arduino would do, and how it would be interfaced.
[16:10:50] <Loetmichel> andypugh: my nails will not get that long
[16:11:09] <Loetmichel> there are to many tools involved in my dayly work
[16:11:16] <Loetmichel> :-)
[16:11:31] <sharpen047> quitte, doesnt matter at the moment. looking for cheap until i go with a c02 long down the road
[16:11:33] <pcw_home> Depending on speed, just plain PWM from an output bit might be OK
[16:11:40] <Loetmichel> wehre i accidentally cut them more often
[16:11:48] <Loetmichel> +than
[16:13:29] <quitte> sharpen047: if all you wanted to do was switching a laser pointer on and off a fet in place of the button with the gate connected to the parallelport would do the trick
[16:14:37] <sharpen047> quitte alright where can i find a schematic? thanks btw
[16:15:33] <quitte> sharpen047: look for high side and low side switches. that should give you all the information you need
[16:20:59] <sharpen047> quitte: so high side is for active high right?
[16:22:46] <quitte> no. the difference is wether you have current going through the switch first, then the load (high side, at the positve line) or load first then the switch
[16:23:36] <quitte> sharpen047: use low side if possible. it's less trouble to match the triggering voltages with
[16:56:21] <DJ9DJ> gn8
[23:42:22] <spack> apparently i just bought a bostomatics 315
[23:42:30] <spack> any bostomatics people here?