Re: [Emc-users] ATS-667 advice

2016-10-15 Thread Chris Albertson
A source for 0.1 bypass caps? I buy most everything fro eBay now. But you don't want a film cap, you want a "Multilayer Monolithic Ceramic Capacitor". I just happen to have one here on my desk and a copper US penny too. I place the cap on the penny and see it is about 2/3 the size of Mr.

Re: [Emc-users] ATS-667 advice

2016-10-15 Thread Chris Albertson
Actually it's easy. You use a hot air re-work station. Basically a hair drier with a 1/8th inch diameter nozzle. Hold the little part in place with a wood tooth pick and aim the hot air generally at the part. The solder on the part and the PCB melt, release the toothpick and surface tension

Re: [Emc-users] Linuxcnc on arm

2016-10-15 Thread Jon Elson
On 10/14/2016 09:50 PM, Chris Albertson wrote: > No, it would not get you to ns levels. > > >I've >> wanted to set this up on X86 through the parallel port for >> some time (since about 2002, in fact) but it would take some >> serious hacking on the PPMC driver. It looks like it might >> be

Re: [Emc-users] Wat OT: Question about injection molding of PVC

2016-10-15 Thread Leonardo Marsaglia
2016-10-15 22:33 GMT-03:00 John Kasunich : > Injection pressure will be trying to force the two sides of your mold > apart. > That's why injection molds are made of tool steel, and injection machines > have VERY sturdy construction to hold the mold closed. I saw a machine

Re: [Emc-users] Linuxcnc on arm

2016-10-15 Thread Jon Elson
On 10/14/2016 12:09 PM, Erik Friesen wrote: > I guess I am not following how a hardware interrupt gets mapped to the > userspace/lcnc servo thread. Any pointers on this? > > Supposedly, this is fairly easy to do on the rt-preempt kernel. It seems it was harder to do this through RTAI. Michael

Re: [Emc-users] Hacking a sim runtime mode

2016-10-15 Thread Dewey Garrett
Trajectory planners used with all LinuxCNC releases have employed trapezoidal velocity profiles (e.g. fixed accels, no jerk limiting). With trapezoidal planning used for both rapids and feed moves the only individual segment motion types are: 1) velocity ramp segment: v = a * t x =

Re: [Emc-users] belt calculators, a PITA

2016-10-15 Thread MC Cason
Gene, On 10/15/2016 08:53 PM, Gene Heskett wrote: > Greetings all; > > I just spent about 3 hours playing around with the 20 or so belt > calculators google gave me links to, but not on of them could give me > any answers. > > One would think, for an XL belt that > > 1. width is a never mind

Re: [Emc-users] Wat OT: Question about injection molding of PVC

2016-10-15 Thread Erik Christiansen
On 15.10.16 22:44, Leonardo Marsaglia wrote: > Yes the idea is to machine the four strips and then joing them strongly. To > clamp the mold I was thinking about mechanical ways like eccentrics or may > be screw clamps. That way I can hold the mold together when the injection > takes place. I

[Emc-users] belt calculators, a PITA

2016-10-15 Thread Gene Heskett
Greetings all; I just spent about 3 hours playing around with the 20 or so belt calculators google gave me links to, but not on of them could give me any answers. One would think, for an XL belt that 1. width is a never mind since xl's are available in a plethora of widths, none of which

[Emc-users] Using CNC mill to hack a gantry Crane

2016-10-15 Thread hubert
I am wanting to cut down a 1000lb rated gantry crane to a size that will fit my Shop. This crane is made from 2" rectangular tubing. I will do the initial cutting with a Harbor Freight band saw, but I can't count on it giving true 90 degree cuts. My thoughts are to true the cut surface with

Re: [Emc-users] Pico Systems Universal Stepper Controller Power Connection

2016-10-15 Thread Jon Elson
On 10/14/2016 07:19 PM, Joshua Glenn wrote: > Hello all. I am wondering if the universal stepper controller from Pico > Systems requires an external 5V power supply or not. And, if so, what is > the current requirement and to what terminals should I connect it? > It requires an unregulated source,

Re: [Emc-users] Wat OT: Question about injection molding of PVC

2016-10-15 Thread John Kasunich
Injection pressure will be trying to force the two sides of your mold apart. That's why injection molds are made of tool steel, and injection machines have VERY sturdy construction to hold the mold closed. I saw a machine that might be big enough to make your parts - the mold closing cylinder

Re: [Emc-users] Wat OT: Question about injection molding of PVC

2016-10-15 Thread Gregg Eshelman
Look up how PVC house window frames are made. They use extrusions, cut the corners at 45 degrees then melt them together. Here's a video on a portable corner welding machine. https://www.youtube.com/watch?v=cni6XdgOTj0 From: John Kasunich To:

Re: [Emc-users] belt calculators, a PITA

2016-10-15 Thread Gene Heskett
On Saturday 15 October 2016 22:29:50 MC Cason wrote: > Gene, > > On 10/15/2016 08:53 PM, Gene Heskett wrote: > > Greetings all; > > > > I just spent about 3 hours playing around with the 20 or so belt > > calculators google gave me links to, but not on of them could give > > me any answers. > > >

Re: [Emc-users] Misc implementation questions

2016-10-15 Thread andy pugh
On 15 October 2016 at 14:54, Erik Friesen wrote: > #1. What method could be used for a tool change recovery sequence? That rather depends on what it takes to recover the situation, but there is scope for reporting tool-changer errors through HAL and a "magic comment" If you

Re: [Emc-users] Hacking a sim runtime mode

2016-10-15 Thread Todd Zuercher
I stripped the config bare, except for motion, and the timer component. had the command connected to the feedback, to try to get as little cpu overhead as possible. I tried setting the thread speed to 1, and it didn't make a difference. But by jacking up the acceleration, I think I was

Re: [Emc-users] ATS-667 advice

2016-10-15 Thread Gene Heskett
On Saturday 15 October 2016 02:55:39 Chris Albertson wrote: > Actually it's easy. You use a hot air re-work station. Basically a > hair drier with a 1/8th inch diameter nozzle. > Hold the little part in place with a wood tooth pick and aim the hot > air generally at the part. The solder on

Re: [Emc-users] Hacking a sim runtime mode

2016-10-15 Thread andy pugh
I wonder of the stand-alone interpreter is a better place to start a time-estimator? http://linuxcnc.org/docs/2.7/html/code/rs274.html It would need tweaking to calculate acceleration, velocity and time, and it would still be inaccurate unless it grew to replicate all of the arc blending code. I

Re: [Emc-users] ATS-667 advice

2016-10-15 Thread Gene Heskett
On Saturday 15 October 2016 02:38:59 Chris Albertson wrote: > A source for 0.1 bypass caps? I buy most everything fro eBay now. > But you don't want a film cap, you want a "Multilayer Monolithic > Ceramic Capacitor". I just happen to have one here on my desk and a > copper US penny too. I

Re: [Emc-users] Hacking a sim runtime mode

2016-10-15 Thread Danny Miller
Ah, I was about to say "no, it's just 100x the accel, not 100x^2 the accel, we're just changing the time frame". But I started to question myself and did the math logically. Duh. YOU are right, I've had that all wrong. That 25% gap seems troublesome. Because, like I say, I need to use it to

[Emc-users] Misc implementation questions

2016-10-15 Thread Erik Friesen
#1. What method could be used for a tool change recovery sequence? #2. Door switch safety? #3. For a brushless servo system without halls, how to get phases in sync with encoder. -- Check out the vibrant tech