Makin Goblets #131 - New Orleans, USA

[MarkRH]

Great build Ted!
Just getting the first jogs out of mine, still waiting on the rest of the correct wire to be delivered. Can you tell me what proxies you used and what aux power supply for them? I ha ve same 126 bob , looks like 3 core wire wired in series?

[xraydude]

Thanks, Mark.

I used LJ12A3-4-Z-BX Proxies. NPN, NO, 3 wire, 12mm tubular. 6-36V, 300ma. I am using 4 of them, 2 on X, 1 on Y and 1 on Z. Because I went with NO sensors, I had to wiree them parallel. Also, instead of using a hole in the metal at the stops to trigger the proxies, I use a cut down bolt in the rail cutouts to trigger, for X and Y. For Z, I use a nut glued onto the stiffening tube that the proxy sees at the top of travel. Easy to understand if you look at the pics. All of the proxy wiring joins up into the main junction box on the table, then a shielded 3-conductor cable carries the signal to the BOB. On the 126, I am not using an aux power supply, I am using the 12V that the 126 supplies at the inputs. Due to the sensor's internal resistance, this configuration requires adding a resistor between the input terminal and the 5V supplied at the input. I have had no issues with this setup since installation. However, because of how I implemented this, I can not sense something like the y-carriage jumping the rails. I had these proxies on hand because of my job, so that is really the only reason I chose them.

BTW, those first movements are awesome, aren't they?

Ted

Ted

[MarkRH]

Thanks Ted,
Bought a 12v power supply not thinking the 126 already has it.
Yes they are... especially when you have the motor tuning way to fast and not zeroed, oh and no e-stops installed, makes it exciting.
I'm glad everything is talking to one another tho. I still dont understand the 3 button e-stop, pause, resume button layout. I think its spec'd by Gerald as 7 core wire? and I havnt got my head around it, 2 cores for the e stop, 3 for the proxies, I thought it was 2 cores each for the pause and resume, will have to reread the thread.

[xraydude]

Hope everyone is staying safe out there. Because my job involves working with a lot of the analyzers used in labs for healthcare testing, I haven't really had any downtime for the past 3 months or so. Did manage to fire the beast up this weekend and make a small run of beer mug handles for a local artist. He just wanted rough cut blanks, as he has jigs created to handle final shaping. He gave me a stencil of the shape he wanted. Scanned it and traced it in Aspire and have started the runs this morning. He gave me a stack of irregularly shaped slabs to use, with some having been epoxy filled. He then takes the blanks, puts them under vacuum and impregnates them with resin. This lets him use wood that is checked, cracked, termite damaged, etc.. in his work. Makes for very interesting looking mugs. Nesting is really the hardest part due to the irregular size and shape of the work pieces. Fun to get back to making dust, for sure!

Quick clip of running a few handles. Volume warning! .25 inch 2 flute. 20 mm ramp in, .125 inch passes depth. 10% stepover. Fed at about 40 mm/sec @ 18k rpm.



https://vimeo.com/422159653


Ted

[xraydude]

Playing around with a laser a bit more. Now using M11/M10 to start/stop laser. Was all set to start testing last night when I realized that the only relay board I had left after redesigning my wife's K40 was LOW active. Exactly opposite of what the PMDX126 provides. Threw together a MOSET inverter and seems to work fine. Still using the 2.5 watt cheap laser. Have a nice 5 watt with PWM control just waiting on me, but not ready to tackle that yet. The main problem I had been having was due to my primary use case being 4th axis work and needing the laser to have Z movement to maintain proper focal distance when engraving on a 3D wrapped job. Using the M11/M10 to trigger rather than using the Z travel to trigger means I can do that. Theoretically. Still working on modding the post processor. I'll be running some 4th axis stuff today and we will see!

https://vimeo.com/462145861

Ted

[smreish]

Great idea Ted, I am in a similar development process with #28 Machine now to use a 7W/15W on the 2nd z-axis. Keep up the good work.

[xraydude]

Awesome, Sean! Would love to see what you come up with.

Made my first test on the 4th axis. Just a straight cylinder, no 3D stuff to worry about. It works, but I still have problems in my post processor. I am getting rapids when I shouldn't and some lead-in burn while making a correct rapid. May be having an issue with how Mach3 handles angular velocity/acceleration, but it is something that I haven't noticed when doing normal 4th axis route jobs, although it doesn't mean it hasn't been happening. I have snapped a few bits that I wrote off to feed rate that may have actually been related to what I am seeing now with the laser operation.

https://vimeo.com/462310454

Ted

[xraydude]

Switched over to a PWM controllable laser. Not ready for placing it under automatic PWM control, but needed to be able to manually adjust laser output for different materials. Still using M10/11 for on/off, but added an external PWM generator mounted on the Y-carriage that allows me to vary the laser intensity. Works great.

Ted

Engraving a beer mug base.

https://vimeo.com/464573157

[bachaabdelkabir]

Well done Ted keep up the good work