Re: [Emc-users] Gecko 203v

On 08/28/2020 12:59 PM, Dave Pape wrote: I had a noise problem with the 203v. I solved the problem by re tapping the 4-40 ground screw in the center of the Gecko's black heat sink. The heat sink is anodized making it non electrically conductive. My 4 Gecko's are all mounted on one common heat

Re: [Emc-users] Noise Problems with Pico Systems USC and Gecko 203V Stepper Drives

On 08/27/2020 11:57 AM, Matthew Herd wrote: This leads me to the conclusion that either the supply somehow struggles under load or the Geckos are introducing inordinate noise. Geckos are known to be quite noisy. They are sending 72 V square wave pulses at 20 KHz into the motor coils.

Re: [Emc-users] Mist Coolant

On 08/20/2020 09:59 PM, John Dammeyer wrote: -Original Message- From: Jon Elson [mailto:el...@pico-systems.com] Sent: August-20-20 7:36 PM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Mist Coolant On Thu, 20 Aug 2020 at 21:36, John Dammeyer wrote: The mill I have

Re: [Emc-users] Mist Coolant

On Thu, 20 Aug 2020 at 21:36, John Dammeyer wrote: The mill I have has flood coolant but I've never used it. Read about bacterial growth and smell. No way to easily add an expensive disk oil separator. Possibly a belt oil separator into the fill hole might work. Thing is the machine shop

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 08/18/2020 12:13 PM, jrmitchellj wrote: Hi Scott. I have a Yaskawa V1000 on my spindle, and have installed a encoder on the spindle. Would you share what settings in the V1000 to get rigid tapping working well? I have braking resistors installed, but don't know what variable to change to

Re: [Emc-users] p-port problems?

On 08/10/2020 01:34 PM, mar...@r-bechtold.de wrote: I switched to an ethernet based mesa karte it is nearly impossible to finde a PCI or PCIe parport card that support Real EPP The 8875 is REALLY old. But, there are good PCI and PCIe cards that do EPP just fine. For PCI, I prefer the SIIG

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 08/04/2020 02:05 PM, Thaddeus Waldner wrote: Do any servos or VFD systems actually run their base frequency higher than 20khz? If not, where do those harmonics come from? Many servo systems run above 20 KHz to increase bandwidth. And, the sharp switching transitions cause there to be

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 08/04/2020 08:00 AM, Matthew Herd wrote: I am guessing that the source of the trouble is probably the VFD, as 80kHz seems like a plausible base frequency for driving an AC motor. Only the USC should be operating at a frequency higher than 60Hz other than the VFD. The machine uses three

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 08/01/2020 01:37 PM, Matthew Herd wrote: Thanks Gene, I hope you’re well also. I disconnected that grounding wire, no difference observed in the ppmc.0.encoder.03.index behavior. The noise seems the same both when spindle is running and stopped, with a tendency strongly toward "true" than

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 08/01/2020 11:10 AM, Matthew Herd wrote: I'm still having issues with the rigid tapping. It works sometimes and fails other times. After scoping the motion.spindle-revs, it appears to be consistent with what we would expect aside from one possible issue. The spindle revs reset to zero upon

Re: [Emc-users] smoother limit3 befor PID not after

On 07/29/2020 01:33 AM, andrew beck wrote: Hey Jon. I think it's all and any usbs that are write protected. I have tried several different usb sticks. Like it's a system option. Ah, in the file /etc/group, you can add users to various groups, to have access to certain things. I'm not sure

Re: [Emc-users] smoother limit3 befor PID not after

On 07/28/2020 04:42 PM, andrew beck wrote: Just a quick question fellows. I need to send the config files to Andy. Now my USB is Copy protected in Linux. Don't know how it happened but how to I disable it so I can copy to USB? Write protect? Some USB memory sticks have a tiny write protect

Re: [Emc-users] Little gear I'm cutting. Thought it may interest people.

On 07/24/2020 02:09 AM, andrew beck wrote: Greg can you educate me on what what gear cutters are enough for most gear cutting needs? Fusion 360 has a nice gear profile generator I can use. But I'll have to model all the cutters after that I think... Thinking keep them pretty simple with no

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 07/23/2020 05:21 AM, Matthew Herd wrote: I should also note I made an error in my revolutions calculation. It should be RPM / 2 / 60 sec * deceleration time = revolutions to stop, assuming linear deceleration. That’s probably the default for most drives. For 560 RPM, that comes out to

Re: [Emc-users] Calculating table acceleration. Was: Need help with Bostomatic BD18-2 to linuxcnc

On 07/23/2020 05:09 AM, andy pugh wrote: On Thu, 23 Jul 2020 at 09:22, John Dammeyer wrote: Not ignoring you at all. Just waiting for an idea for the math that leads to calculating MAX_ACCELERATION in the ini file given the parameters I've mentioned before. I think that the problem is

Re: [Emc-users] Calculating table acceleration. Was: Need help with Bostomatic BD18-2 to linuxcnc

On 07/23/2020 02:00 AM, John Dammeyer wrote: Hi Tomp, I understand the process and the step response. One thing in the mix that we haven't discussed, and I really was hoping Jon Elson would chime in again, is exactly how much impact the servo drive has on all this. Well, both the motor

Re: [Emc-users] wondering what the status is on S curve jerk control getting added into linuxcnc

On 07/23/2020 12:00 AM, andrew beck wrote: Yes I'm not worried about servo following error spikes. But I'm shaking my whole machine to death. As the acceleration is instantly on. In contrast a friend's okuma can go at 40m/min without shaking. Which is amazing to watch. They are both similar

Re: [Emc-users] Calculating table acceleration. Was: Need help with Bostomatic BD18-2 to linuxcnc

On 07/22/2020 11:52 PM, John Dammeyer wrote: But does the accel value in F=ma have to be gravity? And if not, what then? No! G and weight in Lbs are convenient units because we live on earth. They are useless anywhere else. But, they are familiar to anyone who lives here. mass is a

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 07/22/2020 08:51 PM, Matthew Herd wrote: Upon testing, I found that rigid tapping worked as intended, Excellent. Glad Robert Ellenberg is watching here, as most of us had no idea the trajectory planner had this behavior. I love rigid tapping, and have made two fixture plates with a 1"

Re: [Emc-users] need a logic bit mux.

On 07/22/2020 01:17 AM, Gene Heskett wrote: Greetings all; The launch of linuxcnc on the pi is without any motor power until the F2 button is pushed. So at launch time I get messages about the z drive being tripped. So I need a 1 or 2 second delay before that bit is sent on thru, but instant

Re: [Emc-users] Need help with Bostomatic BD18-2 to linuxcnc

On 07/21/2020 06:53 PM, John Dammeyer wrote: Jon, Here's a screen shot (assuming it makes it through). I used your 100 oz-in motor and 0.2" pitch screw. I set the RPM to 3000 but with a 3:1 reduction. Not sure If it would be better to just add two boxes for the reduction so that 0.25 is

Re: [Emc-users] Need help with Bostomatic BD18-2 to linuxcnc

On 07/21/2020 02:54 PM, John Dammeyer wrote: Hi Jon, How did you come up with the constant 0.0318? Long story. There's complicated formula to compute it from the helix angle of the screw. Too much fiddling around. So, if you had a drum with a string wrapped around it that advanced the axis

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 07/21/2020 12:43 PM, Matthew Herd wrote: When I installed the spindle encoder, I used a shaft at the top of the head. Due to my failure to investigate more fully, it turns out that it’s geared 1:1 with the spindle (but is not a part of the spindle). So when I go into backgear, the

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 07/21/2020 12:27 PM, andy pugh wrote: On Tue, 21 Jul 2020 at 18:16, Matthew Herd wrote: Thanks for the insights. I suspected something along these lines, even if I might have other problems with noise. I can confirm, the spindle stops way too slowly and definitely more than 10

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 07/21/2020 12:14 PM, Matthew Herd wrote: Hi Rob, Thanks for the insights. I suspected something along these lines, even if I might have other problems with noise. I can confirm, the spindle stops way too slowly and definitely more than 10 revolutions pass before stopping. Long story

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 07/21/2020 12:09 PM, andy pugh wrote: On Tue, 21 Jul 2020 at 18:03, Robert Ellenberg wrote: 1. The rigid tapping cycle allows a hard-coded 10 revolutions of overtravel beyond the nominal bottom of the hole

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 07/21/2020 12:00 PM, Robert Ellenberg wrote: Based on the videos and your descriptions of the behavior, you may be running into a TP issue I've seen (in simulation) with very sluggish spindles or very high spindle speeds. Here's what I think is going on: 1. The rigid tapping cycle allows

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 07/21/2020 10:15 AM, Matthew Herd wrote: Ahh, so I do use limit switches and a homing routine. So it’s homing to the same position (plus or minus a few thousandths or so). So, use the # key to show machine coordinates, and then move the Z to the safe limits of travel, and note the Z

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 07/21/2020 10:14 AM, Matthew Herd wrote: The ppmc.0.encoder.03.index pin is something I can halscope easily enough. I was having a little trouble getting used to the halscope interface, and without a signal that I know will repeat every revolution, it’s hard to be sure you’re not just

Re: [Emc-users] Need help with Bostomatic BD18-2 to linuxcnc

On 07/21/2020 08:33 AM, Andrew wrote: вт, 21 лип. 2020 о 06:17 Jon Elson пише: So, if your machine has a 200 Lb table, and the leadscrew were to produce 1000 Lbs linear force, it would accelerate at 5 G. This is a simplified calculation, it doesn't account for rotary inertia of ballscrew

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 07/21/2020 04:20 AM, andy pugh wrote: On Tue, 21 Jul 2020 at 10:18, andy pugh wrote: We are not looking for noise, we are looking for spurious encoder count resets. But, thinking further, even if there _is_ noise on the index line, the encoder counter should ignore it. It ignores all the

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 07/21/2020 04:18 AM, andy pugh wrote: On Tue, 21 Jul 2020 at 01:59, Gene Heskett wrote: Try halscoping motion.spindle-revs through a G33,1 cycle in air. halscope hasn't, Andy, by decades, enough bandwidth to register the noise I'd be looking for. We are not looking for noise, we are

Re: [Emc-users] Need help with Bostomatic BD18-2 to linuxcnc

On 07/21/2020 04:07 AM, andy pugh wrote: On Tue, 21 Jul 2020 at 05:52, Tom Smart wrote: If i keep the amps at the rating of 9.1 I should keep my 31.3 IN-LBS or 2.6 FT-LBS? So 2.6 / .0813 would be 81.76 lbs of linear force? So if my table weighs 200lbs my acceleration would be .41 G? I'm

Re: [Emc-users] Need help with Bostomatic BD18-2 to linuxcnc

On 07/20/2020 11:49 PM, Tom Smart wrote: So my 3500 rpm rated motor at 180vdc would be 2916 rpm at 150 vdc and 2333 rpm at 120vdc? Yes, exactly. If my ballscrew is 5tpi then at rated voltage i would get 700 ipm at 150vdc 583 ipm and at 120vdc 466ipm feeds? Yes. If i keep the amps at the

Re: [Emc-users] Need help with Bostomatic BD18-2 to linuxcnc

On 07/20/2020 09:00 PM, Tom Smart wrote: I forgot to ask how would I calculate the loss of abilities of the mill if i don't drive the servos with their maximum rated power and amps? If I were to get drives that weren't rated to 180vdc what losses will i have and how do i calculate the loss?

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 07/20/2020 07:43 PM, Gene Heskett wrote: Interesting. I wonder if he accidently fixed an unwanted ground, or made a bad one good doing it? Murphy is alive and well despite our reward funds. Yes, he had unwanted grounds (loops) all over the place. Actually, he has NO ground, only a

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 07/20/2020 07:04 PM, Gene Heskett wrote: I think I'd drag out one of my 100+ MHZ scopes and look for noise of the type one might get from lack of a single point ground. Right. if the indexres test of the diagnostics shows the position resetting multiple times/rev (may only happen when

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 07/20/2020 05:27 PM, Matthew Herd wrote: Working through Jon’s suggestions, the answers to his questions are as follows. Also, I’m running version 2.7.11 if that helps. No internet in my shop means it gets infrequent updates. Running the universal stepper diagnostics program with the

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 07/20/2020 01:59 PM, Gene Heskett wrote: Jon's (Pico Systems) pwm-servo is a full 4 quadrant controller, without a brakiing R, it will charge the caps in the supply from 125 to about 160 but turns my 1 hp PMDC motor on my GO704 around in about 400 milliseconds. If your supply is higher than

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 07/20/2020 10:51 AM, Matthew Herd wrote: Hi Andy, "But does it also count negative in reverse?" Yes, counts go up and down, depending on the direction I turn the spindle, either manually or under power. Hmmm, the mystery deepens! Well, it may be that the encoder index-enable connection

Re: [Emc-users] Problem with Rigid Tapping on USC Equipped Bridgeport

On 07/19/2020 03:59 PM, Matthew Herd wrote: Hi all, I made my first attempt at using spindle synchronized motion for a rigid tapping operation on my Bridgeport BOSS mill today and it didn’t go as planned. It has a spindle encoder and a Pico USC board. I can use the spindle to read encoder

Re: [Emc-users] Retrofit Candidate?

On 07/18/2020 06:08 PM, Bari wrote: On 7/18/20 5:56 PM, Jon Elson wrote: It would be hard to do anything like this with a Delta scheme, as the errors stack up. Why I asked. Well, the Quad IV C has a gantry with 1 um glass scales on it, apparently. The Quad QSA-30 has shaft encoders

Re: [Emc-users] Retrofit Candidate?

On 07/18/2020 04:06 PM, Bari wrote: On 7/16/20 9:45 AM, Jon Elson wrote: An auction of electronic assembly gear just closed in Austin, TX yesterday. I got a VERY nice pick and place machine for $500, the starting bid. Only one other machine sold. I was amazed! Have you come across

Re: [Emc-users] another vmc project

On 07/16/2020 10:11 AM, lloyd wilson wrote: I've recently acquired another controller transplant candidate, a mid/late 80s Bridgeport 520 vmc. The old girl uses Fanuc DC (yellow cap) axis servos and drives, spindle is also Fanuc. I hope to keep the Fanuc servo drives, but so far, I haven't

Re: [Emc-users] Retrofit Candidate?

On 07/16/2020 07:19 AM, Todd Zuercher wrote: No it doesn't' have a Fanuc control, it is a Yaznac with all Yaskawa drives and motors. Excellent! Yaskawa makes documentation on older products available. There's a good chance it uses analog velocity commands (+/- 10 V). If so, all the

Re: [Emc-users] Retrofit Candidate?

On 07/16/2020 12:39 AM, Bari wrote: The pandemic has killed lots of businesses. 1 out of 4 businesses near me are closing for good. I expect to see deals for the next year at least on just about everything. An auction of electronic assembly gear just closed in Austin, TX yesterday. I got

Re: [Emc-users] Retrofit Candidate?

On 07/15/2020 11:32 PM, Thaddeus Waldner wrote: Some of those large, high-end Japanese names have temperature sensors installed throughout the frame, which they use to compensate for thermal expansion. I doubt this machine has that, but it does look like it has a spindle cooler hanging on

Re: [Emc-users] Retrofit Candidate?

On 07/15/2020 09:03 PM, Stuart Stevenson wrote: Looks like a Yasnac control. I zoomed in on the MPG. It is labeled Yasnac. Ahh, more complicated than I thought. Some models had Fanuc, but I did not recognize that control panel. I don't know Yasnac, but they may be less proprietary than

Re: [Emc-users] Retrofit Candidate?

On 07/15/2020 08:51 PM, John Dammeyer wrote: For that price, rip out the guts and replace the works with COTS units. You end up with single phase. Possibly only a 3HP spindle but do you need a bigger one? The Chinese AC Servos appear to be pretty good. Even the squeal problem from my

Re: [Emc-users] New Spindle working.

On 07/15/2020 07:40 PM, John Dammeyer wrote: After 3 decades of working with Turbo Pascal and then Delphi, Tcl/Python to me is such a step backwards it's painful to use. Yes, I'm with you. I wrote some big programs in Pascal a LONG time ago. The biggest one was a Gerber file to raster

Re: [Emc-users] Retrofit Candidate?

On 07/15/2020 03:08 PM, Todd Zuercher wrote: Would this machine look like a good candidate for a Linuxcnc retrofit? https://hgrinc.com/productDetail/CNC/Used-Mori-Seiki-Mori-Seiki-Mv4540-CNC-VMC/0120091/ Anyone familiar with these, are there a good reasons not to buy it? (Or good reasons to

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On 07/14/2020 01:51 PM, andy pugh wrote: On Fri, 10 Jul 2020 at 10:34, andy pugh wrote: I don't see why there is any limit to the possible reduction of a belt drive, if idlers are added to increase the wrap. And here is an example: https://youtu.be/7zBrbdU_y0s OH MY! Some people REALLY

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On 07/14/2020 04:49 AM, Chris Albertson wrote: But what I wanted to add is that when you read the speed vs. torque curve it is for FULL steps. The amount of holding torque is reduced with microsteps. It makes sense too, full steps use full current that is switched between coils just 100% on

Re: [Emc-users] More cbn headaches

On 07/08/2020 08:03 PM, Gene Heskett wrote: Absolutely Jon. But to do it right requires a machine with little or no backlash so it can't pull the work. Or else, you always did a climb mill finish pass with a very shallow cut. That's what I did on my ancient Bridgeport before I did the CNC

Re: [Emc-users] More cbn headaches

On 07/08/2020 04:01 PM, Gene Heskett wrote: Its the next edge coming round to do another cut, which has to cut thru the oxide that forms on the raw alu after the previous edge clears the scene. And, that's why climb milling works so much better that conventional milling. With conventional,

Re: [Emc-users] Jerky jog in new 2.8 and 2.9 but not old 2.8 (onscreen buttons + mouse OK but not keyboard)

On 07/06/2020 07:05 PM, Leonardo Marsaglia wrote: One thing I find my wireless keyboard does sometimes is that a key can get "sticky wirelessly". Mostly when I'm typing I sometimes get a "" until It suddenly stops. I'm mostly using the keyboard for signing in and modify the tool table

Re: [Emc-users] PCIe vs Ethernet Mesa card?

On 07/06/2020 05:47 PM, John Dammeyer wrote: It's not a big deal. Whacks me across the head if I rush starting AXIS. There's always something to do as the system is brought to life. Like sweep up shavings or add oil to the spindle lube cups on the lathe. Put tools away. Clean rust film

Re: [Emc-users] PCIe vs Ethernet Mesa card?

On 07/06/2020 03:51 PM, John Dammeyer wrote: From: andy pugh [mailto:bodge...@gmail.com] On Mon, 6 Jul 2020 at 21:22, Chris Albertson wrote: Is there any advantage to using a bus connected Mesa card like the 6i25 vs using one of the Ethernet-connected cards such as 7i92M or 7i93 PCI might be

Re: [Emc-users] More cbn headaches

On 07/05/2020 08:55 PM, Gregg Eshelman via Emc-users wrote: That was my clue that I was never going to light a smith wrench anywhere near mag. If you've ever seen a magnesium engine or transmission case burn, it is quite a show. And, when the fire department doesn't have foam in their truck,

Re: [Emc-users] More cbn headaches

On 07/04/2020 04:26 PM, Gene Heskett wrote: IIRC no sparks, 200 or so revs, could just barely hear it touching, peeled two strips down to the alu about 1/4" wide. Not at all impressed. Up to that point, I was watching a very thin cloud of steel dust drifting away in the work light and figured

Re: [Emc-users] More cbn headaches

On 07/04/2020 04:23 PM, andy pugh wrote: On Sat, 4 Jul 2020 at 22:08, Eric Keller wrote: Steel bonds to diamond, and then you are cutting with steel. My understanding of the problem was that it is due to carbon being soluble in steel. And diamonds are just expensive carbon. This is likely

Re: [Emc-users] More cbn headaches

On 07/04/2020 12:54 PM, andy pugh wrote: On Sat, 4 Jul 2020 at 18:02, Gene Heskett wrote: Attacking HSS with diamond is a waste of time and burns up the expen$ive diamond. Whilst it is meant to be a terrible idea, in practice it works OK. I think it depends on surface speed. If the speed is

Re: [Emc-users] More BS-1 clone headaches.-

On 07/03/2020 08:50 PM, Gene Heskett wrote: If you can get it truly lox clean. Or you can find one marked "permanent" which has solvents that can penetrate the lube film. Sharpies have, I believe MEK in them, and so will leave a good mark on surfaces with a trace of oil. Won't work on cast

Re: [Emc-users] More BS-1 clone headaches.-

On 07/03/2020 07:23 PM, Gene Heskett wrote: I thought of that, but I don't know where I could src some of that locally. Is "diechem blue" the right search term to feed google?? Thanks Andy Cheers, Gene Heskett If it is cleaned of oil, you can use a magic marker or Sharpie. DyKem is a layout

Re: [Emc-users] SSD reliability

On 07/03/2020 11:01 AM, Sam Sokolik wrote: I can't remember ever having an issue with any ssd I have used. My laptop which currently has a Samsung SSD 860 EVO M.2 1TB Power_On_Hours = 11845 My desktop SSD reports 57388 power-on hours. Jon ___

Re: [Emc-users] SSD reliability

On 07/03/2020 12:03 AM, linden wrote: Hello All, Any one here have real world experience with reliability of Solid State Drives. I have been using SSDs in several systems. I have a travel laptop that has a small one, Ubuntu 14.04, I think. It gets relatively light use. My main

Re: [Emc-users] First test run on 3D printed CNC conversion

On 06/24/2020 02:55 AM, Chris Albertson wrote: VERY similar design except I bought much larger X and Y motors than you did so there was no need to gear them down. Oh, and that machine is all servos, but the way. The X is a Pittman brushless motor, the Y and Z are brush motors. (I make brush

Re: [Emc-users] First test run on 3D printed CNC conversion

On 06/24/2020 02:55 AM, Chris Albertson wrote: I looked at the photos, can you tell me anything about how the machine performed. If you milled a circle how off-round has it? Well, it has Acme (or square thread) screws with about .004" backlash, so, not perfectly round. But, actually, not real

Re: [Emc-users] First test run on 3D printed CNC conversion

On Tue, Jun 23, 2020, 2:38 PM Chris Albertson wrote: I shot an iPhone video of the first test with all three axes assembled. https://youtu.be/wupYP2NNsXI That looks a bit like my X-2 hack (although mine isn't a real X-2, it is the same machine.) See http://pico-systems.com/minimill.html

Re: [Emc-users] OT: getting an auction purchase shipped

On 06/20/2020 04:52 PM, grumpy--- via Emc-users wrote: i spotted an item on bitspotter.com that i would like to bit on if i where to win the auction how do i go about getting it shipped If this is with a commercial auction house, send them email or call. They probably have a lot of items

Re: [Emc-users] Universal spindle speed control for $7

On 06/19/2020 11:04 PM, Gene Heskett wrote: And they work great, on ferrous gears, but they are all nylon in that machine. Well, of course, they don't have to be ACTUAL gears. You could make a thin steel disc with notches, and it would still trip the sensor. Jon

Re: [Emc-users] Universal spindle speed control for $7

On 06/19/2020 10:30 PM, andy pugh wrote: On Sat, 20 Jun 2020 at 04:05, Ken Strauss wrote: Obviously I'm not contemplating threading at 10K RPM! However, I'd like to leave the encoder installed at all times which is why I'm concerning about it surviving at high RPM. My guess would be that it

Re: [Emc-users] Universal spindle speed control for $7

On 06/19/2020 10:03 PM, Ken Strauss wrote: Obviously I'm not contemplating threading at 10K RPM! However, I'd like to leave the encoder installed at all times which is why I'm concerning about it surviving at high RPM. Suggestion for a cheap gear tooth sensor? I have a little article on my

Re: [Emc-users] Universal spindle speed control for $7

On 06/19/2020 07:03 PM, andy pugh wrote: On Sat, 20 Jun 2020 at 00:38, Ken Strauss wrote: Good point regarding the need for an index. Are there cheap encoders capable of higher RPM? It will cost you less than $10 to find what happens to those encoders at 10k rpm. (My guess would be that they

Re: [Emc-users] Universal spindle speed control for $7

On 06/19/2020 01:01 PM, Chris Albertson wrote: There is all the space I need to build an encoder for the HF mill's spindle. The sensor will fit above the drawbar. I'm thinking of using this sensor. The shaft would point down and thesensor is aligned with an directly over the spindle.

Re: [Emc-users] running a press brake on linuxcnc

On 06/12/2020 04:47 AM, andrew beck wrote: has anyone every retrofitted a pressbrake with linuxcnc? Tx/Rx Labs in Houston has a press brake, and I'm pretty sure it runs LinuxCNC (everything else there does). It is one of the most amazing makerspaces in the world, but their web site

Re: [Emc-users] Working on Pendant and debouncer PCBs, comments welcome.

On 06/07/2020 10:59 PM, Chris Albertson wrote: *One question:Does a pendant need a "activate" button* on the side such that the controls are disabled if you don't hold the button down. You don't want to jog a mill by accident if the wheel is bumped. YES !!! I have mine set up that way.

Re: [Emc-users] MesaNet cards free to good home

On 06/07/2020 08:10 PM, Scott Harwell via Emc-users wrote: How much for the cards? I'm wanting something to play with. In the subject line : FREE to good home. Jon ___ Emc-users mailing list Emc-users@lists.sourceforge.net

Re: [Emc-users] max motor size that a 8i20 can control

On 06/06/2020 06:47 AM, andrew beck wrote: hey andy my motor feedback type is a fanuc incremental encoder. i think it is a sin cos. If this is the 10S motor you are talking about, it has traditional differential TTL quadrature plus index, plus 4 commutation signals that repeat 4 times per

Re: [Emc-users] Simple spindle speed control for mini mill

On 06/01/2020 12:11 AM, Chris Albertson wrote: My cheap Harbor Freight mini mill has a variable speed spindle that is controlled by hand with a knob on the front of the mill. This knob turns a potentiometer.I think all mini mills work like this. Has anyone interfaced the potentiometer to

Re: [Emc-users] FERROR MIN_FERROR value?

On 05/27/2020 01:52 PM, Chris Albertson wrote: On Wed, May 27, 2020 at 11:34 AM Gene Heskett wrote: Have any idea how much spring there is in the iron? I know that just leaning on the head of my Bridgeport will deflect the spindle .001" easily. I often do this when using a boring bar to

Re: [Emc-users] Lathe Spindle Rebuild Quistions

On 05/27/2020 12:18 PM, Curtis Dutton wrote: So after finishing the retrofit of the old Miyano gang lathe the spindle bearings are shot. You can grab the spindle nose and push it side to side about .0005" to .001". The cut quality is also fairly bad. Just cutting a spring pass on an aluminum bar

Re: [Emc-users] FERROR MIN_FERROR value?

On 05/25/2020 07:43 PM, Gene Heskett wrote: Without PID's, where do we get a following error that we can see on the halscope? OK, WITHOUT a PID, then the step generators have a maximum speed, set by (possibly) BASE_PERIOD, step_width and step_space. If you set maximum velocity in the ini file

Re: [Emc-users] FERROR MIN_FERROR value?

On 05/25/2020 02:50 PM, N wrote: Do anyone here have any suggestion for FERROR and MIN_FERROR values? It depends on your "user units", as well as the general accuracy and speed of the machine. FERROR is a multiplier to velocity in user units/second that is added to MIN_FERROR. MIN_FERROR is

Re: [Emc-users] Encoder HAL programming.

On 05/25/2020 11:01 AM, R C wrote: In the video I posted earlier (it's a year old)... the guy using that chip says it cost him $40, he showed it on line for about $28. (and that's just for the LS7366R by itself.) This just doesn't make sense anymore. You can take a bottom of the line

Re: [Emc-users] Face Milling

On 05/21/2020 11:39 AM, John Dammeyer wrote: This was a year ago but based on the latest fly cutting results I'm getting slight ridges so either the fly cutter isn't exactly turning a perfect horizontal arc or I need to tram again. http://www.autoartisans.com/mill/TrammedVertical.jpg

Re: [Emc-users] Face Milling

On 05/20/2020 11:56 PM, John Dammeyer wrote: Anyone used one of these? https://www.aliexpress.com/item/4000890081459.html Years ago, we had CNC meetings at Roland Friestad's shop near Galesburg, IL. He made CNC retrofits to sell to tech schools, and apparently made some of his own tooling.

Re: [Emc-users] timestamp ethernet hardware

On 05/18/2020 10:40 PM, Thomas J Powderly wrote: I think timestamping was a benefit, esp for PPMC. Some PPMC devices can use time stamps to estimate encoder velocity. I don't think that has anything to do with Ethernet packets. Jon ___ Emc-users

Re: [Emc-users] Fluctuating RPM using CUI ATM 10 encoder

On 05/09/2020 01:12 AM, John Dammeyer wrote: One of the greats in computer science has a series of interesting quotes. https://www.azquotes.com/author/15849-Niklaus_Wirth One I really like is: "The belief that complex systems require armies of designers and programmers is wrong. A system that

Re: [Emc-users] Fluctuating RPM using CUI ATM 10 encoder

On 05/08/2020 09:36 PM, Dan Henderson wrote: Thanks for the examples. I'm not going to lie, I've got some homework to do on this. You guy's make this sound easy but to the new guy looking in? No so much, lol There is a good HAL document in the documentation section, written by Hal's author,

Re: [Emc-users] Fluctuating RPM using CUI ATM 10 encoder

On 05/08/2020 06:45 PM, Gene Heskett wrote: On Friday 08 May 2020 18:01:41 Jon Elson wrote: On 05/08/2020 04:04 PM, Dan Henderson wrote: Thanks Jon and Chris! Jon do you have a code example of the Hal filter that is needed? # set up 4th DAC generator as a spindle speed control newsig

Re: [Emc-users] Fluctuating RPM using CUI ATM 10 encoder

the hole. If you aren't useing a PID for the spindle, that leaves motion I think. I think its time we saw your .hal file. Can you insert it into a mail? On Thu, May 7, 2020 at 11:03 AM Gene Heskett wrote: On Thursday 07 May 2020 11:27:57 Jon Elson wrote: On 05/06/2020 09:20 PM, Dan Henderson w

Re: [Emc-users] Fluctuating RPM using CUI ATM 10 encoder

On 05/08/2020 01:34 PM, Dan Henderson wrote: There are times when letting the smoke escape becomes part of the learning process :) Thanks for your guidance Gene. Would think the DC motor energy would be absorbed by the act of tapping once the M3 is turned off? Surely the G33.1 cycle doesn't

Re: [Emc-users] Fluctuating RPM using CUI ATM 10 encoder

On 05/08/2020 11:38 AM, John Dammeyer wrote: Hi Jon, I suppose you are using external hardware to create motion and count encoder pulses? So BASE_PERIOD isn't even used? Or is it still needed for tapping? My understanding is the SERVO_PERIOD time is used to calculate the spindle velocity

Re: [Emc-users] Sourced from: Re: Fluctuating RPM using CUI ATM 10 encoder

On 05/07/2020 06:43 PM, Dan Henderson wrote: I should have mentioned, I’m in the process of building a reverse polarity circuit to trip polarity by issuing a CCW M4 via a 5v output. My motor controller doesn’t natively support CCW. I entered the code and it made it all the way down until the

Re: [Emc-users] Fluctuating RPM using CUI ATM 10 encoder

On 05/07/2020 06:33 PM, Dan Henderson wrote: Thanks Gene! I can go down to 48 PPR on the encoder. If I do so, what is the trade off for reducing resolution on my mill project? Is that enough to successfully use rigid tapping and synchronized feed/speeds? 48 pulses is 192 quadrature counts/rev,

Re: [Emc-users] Sourced from: Re: Fluctuating RPM using CUI ATM 10 encoder

On 05/07/2020 12:23 PM, Dan Henderson wrote: Is there a simple test code I can run to confirm ridged tapping is working or even the feed rate is synchronized to the encoder feedback? Without, spindle-at-speed enabled I’ve no way to visually confirm this. Just try these lines and see what it

Re: [Emc-users] Fluctuating RPM using CUI ATM 10 encoder

On 05/07/2020 12:19 PM, Dan Henderson wrote: I believe this is open loop. Isn’t PID only used in closed loop control? Oh, so the situation with and without spindle-at-speed were BOTH open loop? That is totally different, then, and now I have no idea what is going on. But, checking all

Re: [Emc-users] Fluctuating RPM using CUI ATM 10 encoder

On 05/06/2020 09:20 PM, Dan Henderson wrote: I’ve confirmed the fluctuation occurs when spindle-at-speed is configured. When I remove this feature, the spindle rpm appears to stabilize. It’s almost like it gets caught in a loop trying to chase its tail. This is VERY common in servo systems,

Re: [Emc-users] Fluctuating RPM using CUI ATM 10 encoder

On 05/06/2020 09:20 AM, Gene Heskett wrote: On Wednesday 06 May 2020 09:14:20 Dan Henderson wrote: Here are a couple screen shots of the encoder inputs using Halscope. The first is captured at 300 rpm spindle speed. The second is at 2500 rpm. The signals are inconsistent at the higher speed.

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