#robotics Logs

Jan 17 2013

00:01 sw0rdfish shuggans, why not x86?
00:01 shuggans STAY with x86
00:01 Jak_o_Shadows AMD has some good low-power netbook processers atm
00:01 shuggans x86(intel or AMD) = yes
00:02 dunz0r shuggans: Big ones. 75A :O
00:02 nz0r has an L298 for a driver on his latest b
00:02 shuggans lol
00:03 shuggans i need to power a tank my brother built from steel - will possibly weigh 3-400lbs
00:03 shuggans 2 pride wheelchair motors
00:03 orlok relays. anything less that full throttle is the COWARDS WAY.
00:04 shuggans think 8 of those mosfets a board(one for each motor) will do?
00:04 shuggans orlok: can i control relays with an arduino? Im new into the component level electronics
00:05 shuggans first robotic project
00:05 Jak_o_Shadows Don't you need 4 mosfets per motor?
00:05 orlok shuggans: yeah.. but i was joking, relays are on/off
00:06 shuggans lol, all im gna do with these mosfets
00:06 shuggans im gna daisy chain 2 mosfets per trac in an h bridge
00:06 shuggans will that give me more than 75 amps max?
00:06 shuggans trace*
00:07 Jak_o_Shadows oh, yeah, you can do that i think
00:07 shuggans does it double the max amps?
00:08 shuggans all ive bought so far is the waffle boards from radioshack(8x8's) and the mosfets($1 each!)
00:08 shuggans Im not sure what diodes i will need
00:09 shuggans I want the boards to handle 100 amps though. these motors have 0 information about them online. just replacement part ordering etc
00:10 shuggans So id rather overbuild them to be safe
00:13 shuggans I was GOING to buy a sabertooth 2x60 board from dimension engineering for $200.. BUT this channel convinced me to go arduino + build my own drivers for the learning experience. and im glad so far - arduino programming is awesome!
00:13 Jak_o_Shadows Looking up mosfets, all the logic level ones are too expensive (mostly shipping) from ebay
00:18 rue_house unless you peel them out of dead motherboards
00:19 shuggans I boguht 16 @ a buck each
00:19 shuggans 5 shipping
00:19 shuggans $5*
00:19 rue_house if you get them from china, they are $1 ea with free shipping
00:20 shuggans rue: bough these: https://m.ebay.com/Member/G/ViewItem.aspx?aid=110635862022&tid=965457404001&emvcc=0&nbcol=0%7Cnull
00:20 rue_house I'v bought about 250 things and only had 3 problems
00:20 shuggans will they work well?
00:20 shuggans 8 a board for 1 motor in an h bridge?
00:21 rue_house if you dont get good flyback diodes, ANY mosfets you get will overheat
00:22 rue_house oh wait, this is your first fet motor driver isn't it?
00:22 shuggans But to start: will those be good? daisy chaining 2 together for each trace?
00:22 shuggans this is my first motor driver period
00:22 rue_house :) ok
00:22 rue_house are you using the motor drivers for propulsion?
00:22 sw0rdfish god damn it Dr. Weir just flashed one of her cool tablet pc withs stylus pen.... I NEED to make a choice soon :)
00:22 sw0rdfish hehe
00:22 shuggans yes
00:23 rue_house shuggans, may I save you a LOT of grief?
00:23 shuggans yes
00:23 shuggans poleeeeeze
00:23 Jak_o_Shadows no rue, you may not....
00:23 rue_house do you know how to use a 2 pole 2 throw switch to reverse a motor?
00:23 k_o_Shadows shakes
00:23 shuggans like... just a foward reverse switch?
00:24 rue_house shuggans, yes
00:24 rue_house do you know how its wired?
00:24 shuggans no
00:24 rue_house ok
00:25 rue_house uh where to start on this one
00:25 sw0rdfish hmmmmmmm
00:25 rue_house maybe with an overall summary
00:25 rue_house shuggans, I suggest that you use a relay to do the reversing, and the fet to do the on/off
00:25 rue_house this EXTREMELY simplifies, the fet circuit
00:25 Jak_o_Shadows Maybe a pre-prepared webpage?
00:26 shuggans Nooo lol. it will take forever to load on this connection.
00:26 rue_house and you dont have any losses over the fets
00:26 rue_house shuggans, do you understand the principal?
00:26 shuggans So... constant foward when mosfet gate is on, if relay is on reverse?
00:27 rue_house you can still do speed control
00:27 rue_house the fet controls the speed, the relay just does the direction control for you
00:27 shuggans i havnt looked into speed control yet at all
00:27 rue_house thats ok
00:28 shuggans how do you control speed with mosfets?
00:28 rue_house you can use the fet as on/off or for speed control
00:28 rue_house you pulse the motor
00:28 rue_house hold on
00:28 sw0rdfish thanks for your insights shuggans, I'm heading to bed, gotta get up in like 2.5 hours :S
00:28 rue_house Tom_itx, got your pwm link?
00:28 shuggans lol - have a good one
00:31 rue_house shuggans, hold on
00:31 rue_house Tom_itx,
00:31 rue_house arg
00:32 rue_house your firewall trumped you
00:32 shuggans hmm.
00:33 shuggans im on a 3g mobile hotspot on my phone
00:33 rue_house hold on, I cant find any of the 4 relivent info pages you need righ now
00:33 shuggans hold up though
00:33 rue_house http://eds.dyndns.org/~ircjunk/circuits/dc_ctrl3_sch.jpg
00:33 rue_house studdy that for a while
00:33 rue_house your firewall is blocking file transfers, give up
00:35 shuggans lol - no clue what im looking at :(
00:35 rue_house 3 parts
00:35 rue_house middle left, is power distribution
00:35 rue_house top right is a motor driver
00:36 rue_house bottom right is an identicle one
00:36 rue_house I'm TRYING to find a tutorial I'm SURE I wrote
00:36 rue_house I'm SURE OF IT!
00:37 rue_house shuggans, do you have any switches?
00:37 rue_house you have the voltage switch from a computer power supply, right?
00:37 shuggans yes
00:37 rue_house it has 6 wires off the back, two of them are connected togethor
00:38 shuggans not with me. i work out of towns during m-th
00:38 rue_house ok
00:38 rue_house I cant help you now
00:38 rue_house maybe tommorow after work
00:38 shuggans lol - wanted to get on and discuss motor drivers so I rooted my phone + installed a hotspot
00:38 rue_house read up on H bridges, see if you can beat me to it
00:39 shuggans thats what i was sending u
00:39 shuggans like.... two rectangular circuits stacks on top of eachother
00:39 shuggans motor in middle
00:39 rue_house ok, but you need to understand the principal, not the shpeel with transistors
00:39 shuggans switches on both circuits left/right
00:39 rue_house does your diageam show 4 siwtches?
00:39 shuggans when top right + bottm left are on spins one way
00:40 rue_house ok, that sounds like the right diagram
00:40 shuggans when bottom right n top left on spins the other
00:40 shuggans lol I just drew it in paint
00:40 shuggans I cant upload ftp either
00:40 Jak_o_Shadows I get that diagram rue_shop3
00:40 shuggans but yes
00:40 shuggans 4 switches
00:40 shuggans using mosfets as switched
00:40 rue_house now, do you know what a single pole, single throw switch is?
00:40 shuggans no
00:40 rue_house ok
00:40 rue_house that I need a diagram for
00:40 Jak_o_Shadows apart from the two fets/transistors stacked on top of each other
00:41 rue_house http://www.industrial-electronics.com/images/elec-refridge-5_23.jpg
00:41 rue_house shuggans, can you see that image?
00:41 shuggans the rectangle with the slash is a mosfet right?
00:41 rue_house no
00:41 shuggans yes i can
00:41 rue_house ignore that, you have to understand switches :)
00:42 rue_house ok, so the 1P1T (single pole, single throw) is a standard lightswitch, on/off
00:42 rue_house ok
00:42 rue_house ?
00:42 shuggans yes
00:42 shuggans so in terms of a motor
00:42 shuggans one direction on off
00:42 rue_house yes
00:42 shuggans or in terms of flow
00:42 shuggans and the double throw = two directions??
00:43 rue_house now, 1P2T (single pole, double throw) is what you might use to direct power to one of two lights
00:43 rue_house say, a red or green one
00:43 Jak_o_Shadows OR
00:43 rue_house ok?
00:43 shuggans ok
00:43 rue_house they dont show the wire off the middle like they should
00:44 rue_house want me to show you how that would look
00:44 rue_house ?
00:44 shuggans sure
00:44 shuggans OHHHH
00:44 shuggans okay
00:44 shuggans so your + power is on the pole
00:44 rue_house yes
00:44 shuggans and the ground on both sides
00:44 rue_house no...
00:44 shuggans n u complete one circuit or the other
00:44 rue_house kinda
00:45 rue_house you might get it, I'm not sure
00:45 rue_house I'm trying to draw
00:45 shuggans like...
00:45 rue_house OH duh, camera
00:45 rue_house MY KINGDOM FOR A PEN
00:45 shuggans neg ------o | o-----neg
00:46 shuggans and whichever you trhow the middle to will complete a circuit?
00:47 rue_house wher eis my flash card reader?
00:48 rue_house I think yo uunderstand, please hold
00:48 shuggans so what's the difference between a 2p2t switch and two 1p2t switches side by side?
00:48 shuggans lol kk
00:49 rue_house the 2p switches are 2 switches built into one, they move togethor
00:50 shuggans I see
00:51 shuggans btw: diode goes on trace prior to and after the mosfet in the circuit, facing AWAY from the motor, right?
00:51 rue_house I havn't set up image capture for the new year, so this is a bit more work than normal
00:52 rue_house dont worry about diodes, and transistors, we need to do some stuff with switches
00:53 rue_house its ok your going too fast, this means you will do well
00:53 shuggans kk
00:53 shuggans lol - hope so
00:53 rue_house http://eds.dyndns.org/~ircjunk/tutorials/elex/spdt.jpg
00:53 rue_house ok
00:53 rue_house see that
00:53 rue_house stoplight from hell
00:53 rue_house :)
00:53 shuggans yes
00:53 rue_house understand how it works?
00:54 rue_house tell me about it
00:54 shuggans yes
00:54 shuggans power source at right...
00:54 rue_house whatever there is to tell
00:55 rue_house the other right
00:55 shuggans gah - lol it's 1am :P
00:55 shuggans powersource at the LEFT
00:55 rue_house its ok, I was listening to what you meant
00:55 shuggans positivie trace to both red + green leds
00:55 shuggans with resistors b4 leds
00:56 rue_house (series circuit, because the power goes thru both, the order dosn't matter)
00:56 shuggans negative trace to a 1p2t switch that completes the circuit to either a the red or green light
00:56 rue_house ok
00:56 rue_house the bottom cirlcle of that siwtch is called a pole
00:57 rue_house the arrow aways goes to it
00:57 rue_house the top two circles are called throws
00:57 shuggans I see
00:57 rue_house so thats 1 pole, 2 throws aka single pole, single throw, aka spst
00:58 rue_house sometimes called 1p1t
00:58 rue_house numbers are used more on larger siwtches, like 3p8t
00:58 shuggans you mean double throw?
00:58 rue_house yea :)
00:58 rue_house spdt
00:58 rue_house ^ double
00:59 shuggans :P lol kk, you thre me off there :P
00:59 rue_house ok, now if you gang two siwtches, you draw a line between the arms to show they are in sync
00:59 rue_house I cuaght a tangent, its almost 11pm dont ya know
01:00 shuggans lol - its okay - I didnt get my rights and lefts straight.
01:00 shuggans no worries
01:00 shuggans :P
01:00 rue_house drawing, please hold
01:02 rue_house !assist tutorials/elex/mystery.jpg
01:02 tobbor Possibly http://eds.dyndns.org/~ircjunk/tutorials/elex/mystery.jpg
01:03 rue_house tell me what that switch is
01:03 shuggans loading
01:03 rue_house :)
01:03 shuggans 2p4t?
01:03 shuggans or 2p8t?
01:04 rue_house 2p4t
01:04 rue_house its throws per pole
01:04 shuggans so it goes of how many poles and how many throws per pole
01:04 shuggans :P kk
01:04 rue_house so you were right that each pole has 4 throws
01:04 rue_house cool
01:04 rue_house ok, your switch-versed
01:04 rue_house now, you have a diagram of an h bridge thats drawn with siwtches, yes?
01:04 shuggans sweet-nessss
01:05 shuggans yes
01:05 rue_house ok look at it carefully
01:05 rue_house what type of swtiches are they?
01:05 shuggans i was using login level mosfets as switches
01:05 shuggans logicc*
01:05 rue_house in the drawing tho
01:05 rue_house ?
01:05 shuggans I drew it
01:05 shuggans lol - probably the LEAST proper circuit schematic ever drawn
01:06 rue_house ok, did you draw it with swtiches or transistors?
01:06 shuggans just slashes
01:06 rue_house ok
01:06 shuggans to show the transistors
01:06 shuggans just drew itto show you what i was thinking
01:06 rue_house mogrify -verbose -geometry 640x480 *.jpg
01:06 rue_house there is an image prolly looks alot like yours
01:06 rue_house yesno?
01:07 shuggans I see no image..
01:07 rue_house http://upload.wikimedia.org/wikipedia/commons/thumb/d/d4/H_bridge.svg/310px-H_bridge.svg.png
01:07 rue_house sorry, copy paste fauly
01:07 rue_house t
01:07 shuggans exactly
01:07 rue_house ok what kinda switches are they
01:07 shuggans those r single pole single throw
01:08 rue_house ok
01:08 rue_house now, in that diagram, will you EVER switch 1 and 2 on at the same time?
01:08 shuggans so in effect - thats what mosfets are?
01:08 shuggans no.
01:08 shuggans only 1 and 4, 3 and 2
01:08 rue_house how about 3 and 4?
01:08 shuggans or all off
01:08 rue_house ok
01:09 rue_house so, can you change it all to use 2 of a different kind of switch?
01:09 rue_house brb
01:09 shuggans if you use 2pole, 2 psot switches and run the traces in the h
01:10 rue_house look at just the right half
01:10 rue_house switch 3 and 4
01:10 rue_house because you never have them both on at the same time,
01:10 shuggans OH
01:11 shuggans a 1p2post
01:11 rue_house throw, yes
01:11 shuggans throw* sory
01:11 shuggans sorry* ahhh cant type. lol
01:11 rue_house expand that and tell me about it
01:12 shuggans wait
01:12 shuggans how would that work..
01:13 shuggans positives to both sides and then ground switch between the two?
01:13 shuggans wouldnt that bypass the motor?
01:13 rue_house how about using 2 1p2t switchs,
01:13 rue_house one for each wire of the motor
01:14 rue_house they would select between + and - for that lead of the motor
01:14 shuggans So they were never flipped the same direction at any one time?
01:14 rue_house you have the right idea
01:15 rue_house keep talking/asking about it
01:15 shuggans soooo
01:15 shuggans I would have...
01:16 shuggans each lead of the motor on the pole and the pos/negative leades on the throws?
01:16 shuggans can you do it that way?
01:16 rue_house yes
01:17 rue_house you can do anything you want
01:17 rue_house some things wont work tho
01:17 rue_house that will tho
01:17 shuggans but how will the switch flip if unpowered?
01:17 rue_house !assist tutorials/elex/driver2.jpg
01:17 tobbor Possibly http://eds.dyndns.org/~ircjunk/tutorials/elex/driver2.jpg
01:17 rue_house a relay is a magnetically operated switch
01:18 rue_house tell me your thoughts on that diagram...
01:18 rue_house when you get it
01:18 shuggans thats exactly what I pictured actually
01:18 rue_house I know, I was just waiting for you to say it
01:18 shuggans :P
01:19 rue_house so talk about it a bit
01:19 shuggans its the same thing as the hbridge basically
01:19 rue_house yup
01:19 shuggans just using the poles on the motor traces instead of the power traces
01:20 rue_house so, how many switches are there
01:20 shuggans how do the magnets in the relays know which way to flip without power though? if sitting neither direction they are essentially removed fro mthe circuit
01:20 rue_house !bookmark H bridge tutorial
01:20 shuggans 2
01:20 rue_house ok
01:21 rue_house the siwtches are in position A untill the magnet is turned on, they go to position B
01:21 rue_house magnet off = back to A
01:21 rue_house ok, 2 switches
01:21 rue_house what if they are both up
01:21 shuggans incomplete circuit
01:22 shuggans and same with both down
01:22 rue_house right
01:22 shuggans nowhere for electricity to flow
01:22 rue_house and do you see how we still get the two motor directions?
01:22 shuggans yes
01:22 rue_house a FET is a spst switch
01:22 rue_house transistors are too
01:22 shuggans when the switches flip they switch th flow of electricity to the opposite direction
01:23 rue_house now
01:23 rue_house what we do here is desgin it so that one relay can make the motor go either forward or reverse, but not stop
01:23 rue_house then we put a fet in the supply to it to turn the supply on and off
01:24 rue_house I have to go about 2 hours ago
01:24 shuggans Lol - ok. I should probably sleep here at some point as well.
01:24 rue_house relays commonly come in 1 throw and 2 throw
01:25 rue_house but up to dozens of poles
01:25 shuggans So look up single pole double throw relays?
01:25 shuggans wait, what?
01:25 shuggans O_o
01:25 rue_house can you see how to make that forward/reverser with 1 switch?
01:26 shuggans double post double pole,
01:26 rue_house ok
01:26 shuggans if u have a b on top c d on bottom
01:26 rue_house correct
01:27 Jak_o_Shadows I should do that in the short term.
01:27 shuggans run + to a and c, - to b d
01:27 rue_house http://www.digikey.ca/product-detail/en/HC4E-H-DC24V/255-2776-ND/647858
01:27 rue_house there is an example of a multi-pole relay for ya
01:27 rue_house DONT GO AND BUY IT
01:28 rue_house you can see the datasheet tho
01:28 shuggans :P
01:28 rue_house ok, so, then you put another switch (a fet) between that reverser switch and the power supply, to do on and off
01:29 rue_house and thats what I'd like to stop for tonight
01:29 shuggans lol kk
01:29 shuggans ONE more question?
01:29 shuggans about the fets I have
01:29 rue_house you can still use them
01:29 rue_house they need some help
01:30 shuggans If I daisy chain 2 together - does it mdoubel the amps they can handle?
01:30 rue_house yes,
01:30 rue_house be aware that the wires on a fet can NOT handle 100A
01:30 rue_house to *some* degree, the ratings lie
01:31 shuggans O_O
01:31 shuggans How do you get around that?
01:31 rue_house we disagree about how much the wire on a fet can acually take, I say about 10A or so
01:31 shuggans by splitting it into two circuits to pass through?
01:31 rue_house you can gang fets like rifraf was taking about
01:32 shuggans gang?
01:32 shuggans gang = daisy cahin?
01:32 rue_house "yes"
01:32 shuggans lol ok.
01:32 rue_house you can put them togethor to increase capacity
01:32 shuggans we can get more intothat later - I wont keep you up any longer
01:32 Jak_o_Shadows BTW, what was wrong with using two hex 4009B inverters to drive a normal, non-logic level mosfet?
01:33 shuggans O_o
01:33 shuggans idk what that is
01:33 rue_house Jak_o_Shadows, the output current isn't great
01:34 rue_house better than some things
01:34 shuggans inverter = amplifier?
01:35 Jak_o_Shadows But isn't a mosfet primarily triggered by voltage?
01:41 rue_bed yes
01:41 rue_bed current is needed to fight the capacitance in the fet
01:42 RifRaf anyone use webbotlibs?
01:42 RifRaf looks like lots of useful libs
01:43 RifRaf http://sourceforge.net/projects/webbotavrclib/
01:45 shuggans btw: totally have sample PIC chips on the way + ATMEL chips
01:45 shuggans fo FREEEEE
01:45 RifRaf yay 20 pairs of deans connectors, can make every motor and power source unpluggable now
01:45 shuggans :D
01:45 RifRaf hey shuggins, you gonna eat your sample chips?
01:45 shuggans you bet your sweet ass I am :P
01:45 RifRaf oh you got atmel as well, well goodo
01:46 shuggans I just wanted the PICs to do it
01:46 shuggans Wont use them for anything production
01:46 RifRaf don't worry i have some sample pics as well, never been out of the drawer though
01:46 shuggans :P
01:46 Jak_o_Shadows I've sampled a bit of stuff from TI, but the problem is getting ones that aren't surface mount
01:46 shuggans I bought a cheap pic programmer off of ebay
01:46 shuggans some night when im bored
01:47 shuggans yeah.. I got the big long one + the little tiny surface mount one off the arduino unos
01:47 shuggans wanna try n build an arduino of my own for fun
01:48 RifRaf look at ladyada site, she makes an arduino clone, i got mine up and running the other day
01:48 RifRaf for breadboards, its called boarduino or something
01:49 RifRaf and being able to breadboard it is handy for dev
01:49 shuggans I bet
01:50 shuggans anyways - off to bed for the night
01:50 shuggans see you all tomorrow + this weekend!
01:50 RifRaf night
02:26 RifRaf rue how far did you get on the big hexapod? still making it
08:34 rue_bed yup
08:51 Tom_itx time to wake up
19:11 rue_house shu..
19:13 orlok 7 days
19:16 rue_house http://www.marginallyclever.com/blog/2013/01/download-mini-sumo-sketchup-files-source-code-and-pictures/
19:16 rue_house 7 days of what?
19:16 orlok till i hand over a larg cheque and get some keys in exchange
19:17 GuShH orlok: you finally buying your mom's fridge!
19:18 orlok :P
19:18 orlok Got two fridges.
19:18 GuShH fat.
19:18 orlok One we bought new, its a POS, the other we bought second hand, and its nice.. it cost $2k new
19:18 GuShH wait, I have a full size fridge and two mini fridges... does it make me an alcoholic?
19:18 GuShH orlok: yeah old fridges are the best
19:19 GuShH the new ones are flimsy and with the excuse of being "green" they don't even work properly.
19:19 orlok the second hand fridge is nweer than the other one
19:19 orlok more effecient
19:19 GuShH pft, if a new fridge lasts 10 years I'll be surprised.
19:19 orlok its a big Fisher+Paykel
19:19 orlok the other fridge is some shit brand, seals are gone - i'm only keeping it to put my fermenter in
19:19 GuShH mhh beer
19:22 GuShH captchas are smarter than ever, this is what you get for using an apple product http://gushh.net/tmp/applecaptcha.png
20:04 rue_house ok, so I have another problem with that same motor driver
20:05 Tom_itx now whut?
20:05 rue_house I should go out to the shop and putz
20:06 rue_house I was thinking about making universal joints today
20:06 rue_house the ones with the ball and socket
20:06 rue_house easy on a lathe
20:07 zhanx not good to bounce when you land when jumping out of airplanes
20:07 rue_house I'm supposed to do a bit of work on the 3d printer too
20:08 rue_house zhanx, generally not I suppose
20:08 rue_house you down with a sprained ankle?
20:08 zhanx good exit but some brusies
20:08 zhanx nothing major
20:08 zhanx first jump in 5 years
20:09 rue_house I'm borderline to fall asleep
20:09 zhanx i am stoked
20:09 zhanx back in the 82nd Airborne
20:09 rue_house the extinguisher servive chap SLIGHTLY overcharged an extinguisher
20:10 GuShH orlok: ever made gingerale?
20:10 zhanx thats fine rue
20:10 rue_house has the whole margin there and he goes a hair over
20:10 zhanx still will work
20:10 rue_house yes, but my cert tag is supposed to say its all good
20:11 zhanx true
20:12 rue_house we have to jump thru a lot of hoops here to get a stamp to be able to cert fire stuff here
20:24 rue_house I'm salling aslep in my chair
20:25 Tom_itx take your fingers outta the lathe before you do
20:31 Tom_itx http://cz.mouser.com/new/murata/Murata-MEMS/?utm_medium=Email&utm_source=January2013&utm_campaign=CM-CESPOST-EN&utm_content=LM2
21:12 rue_house while digging around for cardboard to burn on the deck, I just noticed a LARGE pile of computer stuff that was dropped off for me :)
21:13 rue_house "I'V MISPLACED TIM, LARGE AFRICAN ELEPHANT, IF YOU FIND HIM, PLEASE NOTIFY ME!"
21:17 theBear hehe, you so crazy
21:19 rue_house its only like a truckload of stuff, I didn't even notice it on the deck
21:20 rue_house aparently has about 15 mini atx machines
21:22 theBear heh, they'll be hard to find in a pile that size
21:23 rue_house yea, wonder what the rest is
21:23 rue_house I saw phone system cards
21:38 rue_house ok, done eating, I'm gonna go check out my goodies
22:19 rue_shop3 this opens up a huge number of things I can do
22:24 rue_house the question of putting a computer in the truck kinda goes away
22:30 zhanx just opened the mail got my 1/4 collet!
22:32 rue_house I got a lathe...
22:32 rue_house 400 lb package
22:32 zhanx i gpt parts to make one if i can get my cnc back up
22:33 rue_house want anything made?
22:33 zhanx a probe
22:34 zhanx i need to desolder my chips and wire in a probe. your limit idea worked till the surge of '12
22:57 rue_house ?
22:57 rue_house I meant on my lathe