#linuxcnc Logs

Feb 09 2020

#linuxcnc Calendar

01:38 AM fogl: hello
01:45 AM fogl: I thought the PREEMPT-RT patch number should be the same as kernel number. The latest PREEMPT-RT patch is 4.4, and the Debian 9 Stretch kernel is 4.9.
02:20 AM Deejay: moin
04:23 AM miss0r: g'day
04:26 AM XXCoder: yo
06:16 AM jthornton: morning
06:16 AM XXCoder: yo
07:11 AM Tom_L: morning
07:11 AM XXCoder: yo
07:41 AM unterhaus: I saw a reference to someone running a bios from a usb stick. Not installing, computer boots, and the bios on the usb takes over
07:42 AM unterhaus: I can't find any reference to doing that online, too much noise
07:43 AM unterhaus: maybe it is coreboot or libreboot
07:51 AM unterhaus: libreboot main page is mildly obnoxious
09:37 AM jymmmm: good morning
09:41 AM _unreal_: interesting.
09:42 AM _unreal_: just spent the past two hours talking to my father. telling me about his hospital stay.
10:12 AM unterhaus: my wife spends 2 hours a night with her mother. Who doesn't remember her name and usually just babbles. But I guess no medical news
10:13 AM _unreal_: Interesting, my Xwife spends her time with as many different men as she can
10:13 AM _unreal_: hence I'm full time solo daddy
10:14 AM _unreal_: speaking of I should go set eyes on the munchkin, shes out front riding her razer scooter
10:19 AM _unreal_: There finally I finished drawing my cad file for my motor mount for the Y axis
10:20 AM unterhaus: once I get my mill running, I 'm going to build a computer controlled bicycle wheel truing stand. No good reason, but I want a better stand and computer control will be fun
10:21 AM _unreal_: truing?
10:21 AM _unreal_: dont know what kind of a device that is
10:21 AM * SpeedEvil imagines an automated spoke adjuster.
10:22 AM unterhaus: put the wheel in a stand and it has pointers to see how the rim varies from round/centered
10:23 AM unterhaus: there are wheel building robotic machines that adjust spoike, but the wheels aren't very good
10:23 AM SpeedEvil: Machine from bar.
10:24 AM unterhaus: I want to do electronic measurement of trueness, but sensors are expensive
10:24 AM SpeedEvil: Not very.
10:24 AM unterhaus: looking at those gear sensors, but do they work with aluminum/brass?
10:24 AM SpeedEvil: yes
10:25 AM Tom_L: just use a couple dial indicators
10:25 AM unterhaus: where's the fun in dial indicators?
10:25 AM Tom_L: i doubt you get that close anyway
10:25 AM unterhaus: yes, no good reason, just for amusement
10:26 AM Tom_L: i've got a decent truing stand
10:26 AM unterhaus: I have a TS 2.2, not a big fan
10:27 AM unterhaus: There are some decent looking stands on ebay, one is a centrimaster clone
10:27 AM _unreal_: There after a few more adjustments I'm happy with the cad file
10:27 AM _unreal_: now I just need to get the chance to mill the the two parts
10:27 AM _unreal_: one in acrylic, and one in aluminum
10:29 AM _unreal_: the mount I'm designing is my tension/motor mount
10:29 AM unterhaus: SpeedEvil, what inexpensive sensor would measure a small distance as needed in truing a bike wheel. .1mm resolution probably more than enough
10:29 AM _unreal_: Tom_L, so I'm going with a 10 tooth pulley to a 48tooth
10:29 AM _unreal_: my belt is 72" long 360 tooth
10:30 AM _unreal_: dont know what that translates into for force
10:30 AM SpeedEvil: unterhaus: I would start out with a bit of metal on a pot.
10:30 AM _unreal_: the motors are "" 24 oz/in"" brushed servos
10:30 AM _unreal_: unterhaus, just get a digitl dial indicator with serial output
10:30 AM SpeedEvil: - primarily as the geomtry is awkward, and the shape means that you can't simply disambiguate true.
10:31 AM unterhaus: hoping for non-contact
10:32 AM _unreal_: if your dealing with bike wheels that would be a bit of a trick, you would need lasers
10:32 AM SpeedEvil: - if you have a U shape, working out precisely where you're sampling will be a bitch.
10:32 AM _unreal_: something to give a true line
10:33 AM SpeedEvil: I guess a very small light casting a shadow + webcam would do
10:33 AM unterhaus: my spindle metrology software would work, the problem is determining the valve hole. Which I was hoping to use the gear tooth sensors for
10:33 AM _unreal_: one laser as an outside edge detector, and a way to move the center hub tward/away from the laser line
10:33 AM unterhaus: cap probes would work, I think. But they are expensive
10:33 AM _unreal_: unterhaus, do you have any photos of what your doing or are you just designing right now?
10:34 AM sync: or you just use dial indicators, like everybody else
10:34 AM _unreal_: hehe I have a numnber of sensors on hand
10:34 AM _unreal_: sync, shhhh dont give the easy answer
10:34 AM unterhaus: sync, I'm still trying to see where the fun is in that and failing
10:34 AM sync: it works
10:34 AM sync: and is cheap and easy
10:34 AM unterhaus: I don't like dial indicators, probably use some kind of pointer for actual truing.
10:35 AM unterhaus: like the TS2.2
10:35 AM _unreal_: Y axis motor mount rev1
10:35 AM _unreal_: @#$%!@#$%
10:35 AM _unreal_: wrong keyboard again
10:36 AM unterhaus: good thing you don't have a naughty chat going on another keyboard
10:36 AM _unreal_: I couldnt survie with out dial indicators
10:36 AM _unreal_: or do I (( :)
10:36 AM unterhaus: dial indicators have their place, overkill for bicycle wheel truing IMHO.
10:37 AM Tom_L: renishaw probe then?
10:37 AM unterhaus: have to look at gear sensors more closely
10:38 AM sync: nah, dial indicators are not really overkill
10:38 AM sync: you can get close by eye but before I used inducators I got shimmy at high speeds
10:39 AM _unreal_: nothing like square wheels I always say
10:39 AM sync: it's also dependant on the tube and tire, but the biggest difference was getting the rims very true
10:42 AM unterhaus: I have resolved to never get in an online discussion that involves shimmy
10:43 AM sync: well, I also balanced my wheels at some point but it's not really worth the hassle
11:18 AM _unreal_: hehe, and what kind of tires have you balanced today
11:18 AM _unreal_: ok, I Just finished doing what soldering I can to my motor controllers, still waiting on the final parts @$#%@#$@
11:18 AM _unreal_: SMD's and the final opamp
11:19 AM _unreal_: luckly I dont have to pay for the opamps, the company "ebay" that I got them from totaly F'ed up and sent them to the wrong location, now I just have to wait.
11:19 AM _unreal_: funny thing is that digikey has the same opamps at $27 EACH. and I found them on ebay for $9 each.
11:20 AM _unreal_: so i went from maybe spentding $70, to $28, to $0 :)
11:20 AM _unreal_: just got to wait ARG...
11:20 AM _unreal_: this comming week though I should get a bunch of parts in the mail FINALLY
11:21 AM _unreal_: !! freaking hell the amazon site said monday. now the item says fri. for delivery
11:48 AM rmu: _unreal_: what opamp ist this at $27 ea?
11:59 AM skunkworks: must be audiophile grade...
12:00 PM skunkworks: maybe they have tubes in them..
12:04 PM rmu: i'm surprised a motor controller uses such expensive opamps
12:05 PM Loetmichel: re from my sisters place ... MAAAN if you drive 180kph/112mph that BMW 525i GUZZLES fuel... and i took a radar picture... not expensive though, limit was 100, gps said 112. so probably 35eur. ON the positive side: that Engine is "free" again... no more dirt in the cylinders/on the valves ;)
12:06 PM rmu: something like that http://www.ti.com/lit/ds/symlink/opa637.pdf is in the 25€ range
12:07 PM rmu: Loetmichel: speed limit is coming
12:10 PM Loetmichel: rmu: i doubt it
12:20 PM rmu: unlimited autobahn speed is kind of "2nd amendment" of german grundgesetz ;)
12:38 PM Loetmichel: rmu: indeed
01:02 PM net|: awesome , new openwrt is 4x faster for wifi send speeds
01:11 PM Jymmm: What is "DAE" ?
01:17 PM Tom_L: Jymmm, in regard to what?
01:17 PM Tom_L: department of atomic energy?
01:18 PM Jymmm: Ah, just found it... Digital Audio Extraction (DAE)
01:19 PM Jymmm: Tom_L: If you care... https://www.xiph.org/paranoia/faq.html
01:20 PM Tom_L: still on the ripper hunt?
01:21 PM Jymmm: No, just readiing more about the tools
01:21 PM Jymmm: Tom_L: I found abcde. seems pretty good
01:22 PM unterhaus: only time I worry about ripping is when I get a new phone
01:22 PM unterhaus: everybody needs a special ringtone.
01:23 PM Jymmm: Tom_L: https://abcde.einval.com/wiki/
01:31 PM CaptHindsight: rmu: i forget the opamps part number they are similar to these http://www.ti.com/product/OPA541
01:32 PM CaptHindsight: or http://www.ti.com/product/OPA549
01:34 PM Deejay: re
01:48 PM _unreal_: CaptHindsight, ?
01:48 PM _unreal_: I'm using the OPA549
01:49 PM _unreal_: and STILL waiting for my remaining chip to arrive
02:05 PM _unreal_: ve7it, I am so tired of waiting for parts to arrive
02:05 PM _unreal_: :(
02:06 PM _unreal_: 99% of my hold up is all these freaking parts
02:06 PM ve7it: yea... slow process accumulating bits.... will get even slower as china supplies dry up
02:07 PM _unreal_: will be interesting to see what happens since trump got his china trade deal finally
02:08 PM _unreal_: I know of a number of people who have lots millions thanks to having to give up there IP to china just to have them produce the product. only so they turn around and copy it and sell it for them selfs
02:08 PM CaptHindsight: I've gone from 0 to fully functional linear servos in days for cheap on ebay with no soldering
02:08 PM _unreal_: ?
02:09 PM _unreal_: CaptHindsight, what are you tlaking abou tabout the opamps?
02:09 PM _unreal_: and got photos?
02:09 PM _unreal_: ve7it, I'm trying to figure out what my torque will be on the cnc
02:10 PM _unreal_: I ordered some nice toothed pulleys, 10 tooth to go on the servos
02:10 PM _unreal_: the large drive pulleys are 48 tooth
02:10 PM _unreal_: the servo motors are 24 oz/in
02:10 PM _unreal_: and they are driving 1/2-13 TPI threaded rod
02:17 PM _unreal_: ?
02:17 PM _unreal_: OMG... I'm still waiting for my father to leave so I can start milling
02:20 PM ve7it: I think you should be fine.... things might move a little slow, but you can always change the cheap pulley to be a little bigger. If you want to be ahead of the game, you could order some 14, or 15, or 16 tooth.
02:21 PM ve7it: try and make your motor mounts with lots of adjustment so you can use the same size belts
02:23 PM ve7it: the cool thing with servos is they have peak torques many times their continuous rating which helps with acceleration.
02:30 PM _unreal_: ve7it, I got the smallest pulley size I could find that would fit the shaft :)
02:30 PM _unreal_: being a 10 tooth
02:30 PM _unreal_: the shaft is 8mm
02:31 PM _unreal_: will the 48 tooth is the largest I have on hand that is reasonable
02:32 PM ve7it: that will give you the biggest reduction, but is a tight wrap for the belt
02:32 PM _unreal_: ?
02:32 PM _unreal_: tight wrap?
02:32 PM _unreal_: oh going around the pulley
02:33 PM _unreal_: soon as I can start building it I have (milling)
02:33 PM ve7it: a stiff belt has a hard time wrapping arount a very small pulley
02:33 PM _unreal_: the belt I got is not very stiff
02:33 PM ve7it: cool
02:33 PM _unreal_: https://www.amazon.com/gp/product/B01N1YNSR8/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1
02:34 PM _unreal_: https://www.amazon.com/gp/product/B0747CX1N7/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
02:34 PM _unreal_: https://www.amazon.com/gp/product/B07BPHRSN5/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
02:34 PM _unreal_: goes around the idlers with ease
02:34 PM _unreal_: still waiting on my toothed idlers from china :(
02:35 PM _unreal_: at this point its just a swap out when they get here
02:35 PM Tom_L: using the smooth for assembly?
02:35 PM _unreal_: smooth?
02:35 PM Tom_L: idlers
02:35 PM _unreal_: ya just to get it setup
02:36 PM _unreal_: I purchased two of those large belts so I have a back up
02:36 PM Tom_L: how did you figure the length?
02:36 PM _unreal_: wrapped steel wire around the pulleys
02:36 PM _unreal_: and got the length
02:37 PM _unreal_: 72" over all if the belt was layed out
02:37 PM _unreal_: in a straight line
02:37 PM ve7it: that is one big (long) belt! that must drive 2 x axis lead screws?
02:37 PM _unreal_: yes
02:38 PM _unreal_: https://drive.google.com/open?id=1iklKpYIqOhs70yq-xktLj4IxJeOcpPkq
02:39 PM _unreal_: I need to take a more recent photo and post it
02:39 PM _unreal_: much further along then that
02:39 PM Tom_L: yeah cause i don't think you've done anything :)
02:40 PM net|: anyone know of a digital hotglue gun ? preferably rechargable
02:40 PM Tom_L: not off hand
02:40 PM Tom_L: digial display or digital dispensery?
02:42 PM _unreal_: uploading a new photo
02:42 PM _unreal_: https://drive.google.com/open?id=1jXifD_B7L9WyiNbcD5RZzb-pGwuM2Spr
02:43 PM Tom_L: that last one did show progress i hadn't seen
02:43 PM _unreal_: just took that
02:44 PM _unreal_: Tom_L, that should be far more advanced then :)
02:44 PM ve7it: interesting... I just measured my hot air station current draw... it was suppossed to be 700W... measures more like 350W... I think I got the 240V heater element in the thing, not the 100V element
02:44 PM ve7it: still works fine, but may be limited in output
02:45 PM ve7it: no using it to light the wood stove
02:46 PM ve7it: on the plus side, the element should last a long time.
02:47 PM Tom_L: _unreal_, what sort of travel do you plan to get?
02:53 PM ve7it: looking good!
03:11 PM _unreal_: 30"x16-18 ish
03:27 PM Loetmichel: ve7it: that would mean a quarter of the power draw, not half
03:27 PM Loetmichel: if you got the 240V element in there
03:42 PM -!- #linuxcnc mode set to +v by tolkien.freenode.net
03:42 PM -!- #linuxcnc mode set to +v by tolkien.freenode.net
03:45 PM -!- #linuxcnc mode set to +vv by tolkien.freenode.net
03:46 PM Deejay: gn8
04:03 PM ve7it: Loetmichel, you are correct... powers are approx, It was not nearly what I expected... special chineese surprise!
04:04 PM gregcnc: typical? maybe
04:40 PM _unreal_: so milling my acrylic part right now
04:41 PM _unreal_: thought I had a large chuck of aluminum sheet already cut but I cant find it. sigh guess I'll cut an other oen
05:08 PM JT-Shop: got two emails from a chap with questions about the mill I have for sale... maybe he's interested
05:09 PM XXCoder: nice
05:24 PM jthornton: he must be near Memphis, he replied to that ad
05:25 PM XXCoder: higher chance of actual serious customer
05:25 PM XXCoder: some people just waste time
05:25 PM jthornton: yea the one's that come out of the gate with crap questions like what's your bottom dollar?
05:26 PM jthornton: I add 10% to the asking price and shoot that back just for fun
05:26 PM jthornton: or what's your top dollar?
05:27 PM pfred1: 10 cents on the dollar
05:27 PM XXCoder: heh hagging is lost art
05:28 PM jthornton: yea if you want to bargain with me make an offer, don't ask me to reveal my hand
05:29 PM XXCoder: indeed
05:29 PM SpeedEvil: 'Free, but you're digging my garden and putting up a shed first'
05:29 PM jthornton: lol
05:29 PM XXCoder: $100. "whats your bottom dollar" "$120"
05:30 PM jthornton: exactly
05:35 PM _unreal_: arg...
05:35 PM _unreal_: milling aluminum on my mini machine is so damn scarry
05:36 PM _unreal_: the spindle doesnt have enough pepper for a 1/4" bit
05:36 PM _unreal_: so using 1/8th and boy it likes to dance even with a 45 degree plunge
05:36 PM XXCoder: slow down feed a bit
05:37 PM XXCoder: yeah frame just isnt rigid enough heh
05:37 PM _unreal_: its less the frame and more the bit
05:38 PM _unreal_: i'm only going 200mm/m and 1/16th plunge
05:38 PM SpeedEvil: Avoid sharp jerks by filling the printer with silly putty.
05:38 PM _unreal_: ?
05:38 PM syyl_: silly putty is an important engineering material.
05:38 PM _unreal_: I'm milling for starters
05:40 PM XXCoder: printer?
05:40 PM andypugh: syyl_: I shared an office with a chap doing a PhD on sillly putty in engineering. We had tens of kilos of the stuff to play with.
05:40 PM XXCoder: unreal ya seems slow enough, unfoirtunately not very rigid frame it will do that
05:41 PM XXCoder: andypugh: thanks for video
05:41 PM syyl_: :D :D :D
05:41 PM syyl_: haha
05:41 PM pfred1: andypugh any newspaper comics?
05:41 PM _unreal_: the only part of my frame that really has play is the final Z portion
05:41 PM _unreal_: :/
05:41 PM andypugh: XXCoder: I need a better algorigthm for finding the edge when it misses. But I did find a better way to automatically stop.
05:42 PM _unreal_: I'm VERY glad I'm using multi finishing passes
05:42 PM XXCoder: hmm what if it loses edge it reverses and touch on same spot as before, then take it slower
05:42 PM XXCoder: go past it then turn 90 degrees
05:42 PM XXCoder: move in
05:42 PM andypugh: The #1 “heading angle” is automatically calculating the “winding number” so all I need to do is use “O100 WHILE [#1 GT -361]
05:43 PM andypugh: Well, you don;t know that the corener is square
05:43 PM _unreal_: XXCoder, I'm doing climb cutting for starters
05:43 PM XXCoder: yeah though very good chance it will hit something
05:44 PM XXCoder: since its basically trying to hit same area as last touch
05:44 PM _unreal_: I cant do traditonal cutting the bit flex's and walks into the cut to much over sizing the cut
05:44 PM XXCoder: unread ya makes sense
05:46 PM XXCoder: andy so basically if it hits, it moves that way small amount then moves in and hits again, then it calculates new angle and follows it
05:46 PM andypugh: What I do is leave the probe where it is, and move the heading angle -15 degrees (ie 15 degrees clockwise) and then probe again. What this does is sucessive sides of a dodecagon centred on the last-probed point. That always finds the edge, but then there is a problem with the slow-probe-off which then becomes a move _through_ the corner to the old starting point. Which is rather not ideal.
05:46 PM _unreal_: XXCoder, when this part is done I can mount my first motor to the new machine
05:46 PM _unreal_: "" provided I didnt fuck up something ""
05:46 PM _unreal_: you know the OH.... moment post production
05:46 PM andypugh: XXCoder: The code is on the YouTube video. It’s pretty compact and simplistic.
05:48 PM XXCoder: that seems more flexiable actually
05:48 PM XXCoder: shorter script too I would think
05:49 PM _unreal_: I find it funny how I'm doing someting I've always not been able to do. milling slots in aluminum
05:49 PM XXCoder: oh yes, that part where you strunk parameter then delete data points, is it because probe have a ball of certaon diameter?
05:49 PM andypugh: Yes
05:50 PM andypugh: It’s rather easier to do it in the CAD than in the G-code
05:50 PM XXCoder: unreal you using helix cuts?
05:50 PM _unreal_: yes
05:50 PM XXCoder: indeed. better to have accurate model to work off, then adopt gcode to it
05:50 PM XXCoder: thats good
05:50 PM _unreal_: helix for the holes
05:50 PM _unreal_: parallel pocketing for the pockets
05:51 PM andypugh: Not HSM?
05:51 PM _unreal_: peck to start, helix to open, and prallel pocketing to finish
05:51 PM _unreal_: and a finish 0.01 pass
05:51 PM _unreal_: .01" pass
05:52 PM _unreal_: I sware that dust shoe is one of the best BEST damn things I've bilt on the machine
05:52 PM _unreal_: I laugh at the number of projects I did before I built it
05:54 PM _unreal_: good lord, just got a look at the part pass. and I think something screwed up. that looks like 1/8 pass not 1/16
05:54 PM _unreal_: checking code
05:57 PM _unreal_: odd, according to the code its 1/16th
05:57 PM XXCoder: did you set tool diameter to correct value?
06:07 PM diginet_ is now known as diginet
06:13 PM _unreal_: faaaaq u.............. I lost major steps somewhere
06:17 PM _unreal_: at least its on the back/non visable side
06:19 PM _unreal_: 22min of milling and its done
06:19 PM _unreal_: good lord
06:19 PM _unreal_: x and Z motor mounts and I'll be done
06:19 PM _unreal_: and working on the Y
06:29 PM _unreal_: 3 broken bits tonight one part wtf
06:30 PM XXCoder: fun
06:30 PM _unreal_: two becuase I didnt know it lost steps and couldnt tell till it reached a location where I could see that had lost them
06:30 PM _unreal_: and one because a FLAP started on thin metal. it grabbed pulled in adn stalled the bit snaping it
06:30 PM _unreal_: couldnt see that one because it was behind the dust shoe
06:31 PM _unreal_: doing the finishing pass right now
06:32 PM _unreal_: so far looks amazing
06:32 PM _unreal_: so glad I got this stupid little red LED lamp on a flex neck, from some desk lamp setup. WISH I had a second
06:32 PM _unreal_: would put it on the new machine when its finished
06:35 PM pink_vampire: hi
06:35 PM XXCoder: yo
06:36 PM XXCoder: unreal the ikea one?
06:37 PM _unreal_: ?
06:37 PM XXCoder: the led light
06:38 PM _unreal_: https://drive.google.com/open?id=1Epi_HnCUA83Bbr7-sbDEt4EFKLzObQoM
06:38 PM _unreal_: the base is long gone
06:38 PM _unreal_: ran on batteries AA's 4v
06:38 PM XXCoder: interesting
06:38 PM XXCoder: dont look like any ikea
06:39 PM _unreal_: I dont recall what the base looked like just that it took batteries and the entire thing was red
06:39 PM _unreal_: all but the neck
06:39 PM _unreal_: Oh thank god 2min left
06:40 PM XXCoder: you gonna look into why machine loses steps sometimes?
06:41 PM _unreal_: likely too fast
06:41 PM _unreal_: dont know
06:41 PM _unreal_: its just to much resistance
06:41 PM _unreal_: I only have real issues cutting aluminum
06:49 PM _unreal_: ok just ran my part over the bench grinder. and the aluminum part matches up to the acrylic one perfect
06:49 PM XXCoder: nice
06:49 PM _unreal_: now I just need to adjust some holes/drill/tap
06:49 PM _unreal_: I under cut the holes so I could hit them with a drill bit
06:49 PM _unreal_: aluminum the machine tends to make more slightly oval holes then round
06:50 PM _unreal_: anything soft no issues
06:50 PM XXCoder: you need to get reamer or something
06:51 PM XXCoder: though reamer may be too much for your machine? dunno
06:51 PM Tom_L: too much backlash on one axis
06:51 PM XXCoder: reamer tools tend to be very long, you might have to cut it down then refinish end
06:55 PM perry_j1987: odd trying to face with a 1/8 endmill and its leaving a little skin of metal between the paths heh
06:55 PM perry_j1987: default fusion360 facing op
06:55 PM perry_j1987: works fine with my larger endmills
06:56 PM XXCoder: hour 1/8 might be slightly smaller than 1/8
06:58 PM Tom_L: tool flex
06:58 PM XXCoder: or that yeah
07:00 PM perry_j1987: ya it is long flute endmill
09:44 PM _unreal_: So the verdict
09:44 PM _unreal_: just got the Y motor semi mounted
09:44 PM _unreal_: DAMN that belt is tight
09:45 PM _unreal_: not sure how but I could use a hair more slack in the belt
09:45 PM _unreal_: 74" would be too long 72" is on the tight side
09:50 PM _unreal_: I need a 730xl timing belt
09:50 PM _unreal_: That would be more ideal
09:50 PM _unreal_: I'll live with my error for now it will WITH luck ware fast :)
09:51 PM _unreal_: https://images-na.ssl-images-amazon.com/images/I/81DOzh0YL1L._SL1003_.jpg
09:54 PM X704 is now known as tiwake
10:13 PM Elmo40: _unreal_, no tensioning option?
10:14 PM Elmo40: do what they do in timing systems on cars
10:14 PM Elmo40: have a tensioner pulley
10:44 PM veegee: All things considered, I think step pulley head would have been better
10:46 PM veegee: VFD + step pulley head + 3HP motor is the best setup. Much simpler head design, can usually leave the belt in the same configuration and change speed via a torque vectoring VFD and still get high torque at low speed
10:46 PM veegee: I ripped out all the silly electrical stuff like the contactor and reversing switch and directly wired the motor to the VFD