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Messages - Stonemull

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1
Grbl Controller / Headless GRBL
« on: February 14, 2018, 07:31:31 PM »
Still have my CNC plasma cutter concept in the thinking machine but getting the hardware together.
Recently made a battery pack adapter to drive it with https://www.thingiverse.com/thing:2770920
Reason being is plasma cutters etc are pretty awful on the noise front, also requires my fairly large air compressor to cycle and between the 2 it iften blows the breaker to the shed, so decided I want the controller headless (no PC) and battery operated, if I stick a SD card on it, need a way to select files and home the machine etc, so a display and sone sort of input device is required.
I now have a PC just for going in the shed and wired the shed up with the house ethernet, its an old touch screen HP, I added a dual boot to it as I thought running LinuxCNC might be a future option, since decided to go headless on the plasma though. The PC is now setup with Eclipse and I have it compiling grbl for the Ramps 1.4 though, so good for dev work currently.
Today the rest if the hardware arrived, everything I should need.
Hoping someone has already done the hard work but not found anything driving these graphic displays with grbl yet.
Anyway, still alive and doing stuff o/



2
Mini CNC / Re: Sieg ?
« on: January 16, 2018, 09:57:50 AM »
I will pull it down soonish, it seems pretty well setup atm though and I wanted to get some data first so if I reassemble and its not as good, I know I can make it betterer if you know what I mean  :)
Will probably wait till I have a dial indicator to start with, really need some gauge blocks, surface plate, scrapers and prussian blue to really tune one.
Used some luggage scales to roughly check torque on the X and Y axii just tugging on the handle, around 600g on the X and up to 2kg Y, handle is about 35mm from axle so I reckon even a nema 17 could spin it geared down 5:1 or something. Plan is to get some nema 23's ultimately.
I have some 150mm loop belts and 16T pulleys and a couple of larger ones, 64T?, thought I might have a muck around with nema 17's first.

3
Mini CNC / Re: Sieg ?
« on: January 16, 2018, 02:08:11 AM »
Yay, it arrived .. only have limited tooling currently, my largest end mill is 6mm, plus the mill only comes with 2 T-nuts and no bolts to screw into them, so I bolted my drill press vice to the thing and got my feet wet on a piece of aluminium I melted into a muffin tray some time back.
Will be looking at automating it soonish, will need some experiments. It seems backlash on the X and Y slides are not as bad as I expected,  will be ordering a bunch of new stuff I guess, dial indicators, clamps etc etc..

Just checked basic backlash by lightly clamping my digital verniers in the vice, X is an astounding 0.01mm and Y a fair bit worse at 0.14mm.
Not bad straight from the crate though, now going to read the manual..


4
3D Printer Software / Re: 3D Printer Slicers
« on: January 08, 2018, 01:37:50 AM »
no love for skeinforge ?

:)


5
Mini CNC / Re: Sieg ?
« on: December 20, 2017, 08:07:38 PM »
Bought the Sieg

6
Mini CNC / Re: Sieg ?
« on: December 20, 2017, 07:16:40 PM »
I got the email on that too, that is actually what started me hunting for parts, free shipping within the US, with motors this is still more expensive without delivery than the Sieg X2. That is what got me thinking .. ok it can do thin aluminium, slowly .. I would rather have one that can do steel if required. I could then use it to make brackets and stuff and make me own little mill :)


7
Mini CNC / Re: EleksMaker 555 Spindle Motor
« on: December 20, 2017, 06:31:49 PM »
It doesnt look like there is any switching on the motor pcb, just spike suppression caps, I would say connecting 12v to the barrel connector on the motor will run it flat out and the 2 wire connector will be connected in parallel with it. So if you have a control board with a decent mosfet on it then just use the motor output on the board and forget about the barrel connector.



8
Mini CNC / Sieg ?
« on: December 20, 2017, 08:43:15 AM »
I was pricing bits to make an aluminium capable mill, still no idea, tossing up c-beam, sbr16, sbr20 etc etc.. looking like not much going to happen under $1000 in reality .. bits add up.

Then I saw these on ebay https://www.ebay.com.au/itm/Sieg-X2-Variable-Speed-Dovetail-Milling-Drilling-Machine-Mill-Drill/391945151546?hash=item5b41c0643a:g:rckAAOxyVaBStM0B

These sieg machines are rebranded as lots of others, including harbor freight, so now I am wondering how hard it would be to add some nema23's to something like this instead, might need gearing down but so what, pretty easy to come up with something I reckon.
One thing that has me wondering .. backlash, I see the fine Z axis winder on the front has half a turn of backlash before it engages the coarse spindle.

couple of example videos in action https://www.youtube.com/watch?v=II_1xK_6m34

and oh .. here is one converted to CNC .. https://www.youtube.com/watch?v=Ve43EJHYGNo

and one doing 1/4 steel plate with CNC https://www.youtube.com/watch?v=VHw0cG5EzG8

comment by uploader
Quote
Exactly, I have not using a chuck, just a end mill holder made by my self, you know, to convert the X2 machine is very easy and not so expensive, have good kits on market like little machine shop.

ok, looking for sieg x2 cnc turns up like this kit http://www.cncfusion.com/minimill1.html
which is nearly as exxy as the mill and includes new ballscrews .. but not the motors or mounts, damn. I still wonder if its doable without exxy added bits.

found a thread with a dude doing a conversion https://forum.ausrocketry.com//viewtopic.php?t=4002

So .. what ya reckon.
Can you see disadvantages of going this route ?


edit: forgot to mention this guy too .. https://www.ebay.com.au/itm/Sieg-M1-Vari-Spd-Multi-Function-Metal-Lathe-Milling-Drilling-Mill-Drill-Machine/382310729057?hash=item59037ec561:m:mz2H6T9xW4O7N3dZ2DdK0ww

combo lathe mill, dunno, might do neither well ..







9
T2 Engraving / Re: Thanks Zax
« on: December 20, 2017, 05:27:41 AM »
Good luck. It takes some practice but with some patience, you will be putting us all to shame.

except for that one guy with the PhD in burningology.

10
Projects / Re: JTICE - My Engravings
« on: December 18, 2017, 09:33:49 PM »
dude, I think you might be the first PhD in laser engraving.

11
T2 Engraving / Re: Timed Pause command
« on: December 17, 2017, 05:37:42 PM »
Agree with Zax .. however the gcode G4 command does pause .. except the gcode spec for G4 is in milliseconds I thinh however grbl treats it as seconds.

so a G4 P600; should be a 10 minute pause, I cannot remember if it turns the laser off or not, probably not .. so will have to embed it with a laser on/off command (if the laser is on in the gcode), or simply add it after an M3 command. i think it does do decimal though .. so G4P0.5 would be a 0.5 second pause, been a while since I tested the function so not 100% sure.

so
M3;
G4 P600;
M5;


12
General Discussion / Re: changing Slot to 3030
« on: December 13, 2017, 06:32:35 AM »
I think 2020 would be fine for the laser with the tiny stresses involved, they just used 2040 on the wheeled extrusions to give a bit more stability, unless you have extrusions flexing during acceleration I think it would be a waste of good aluminium and effort.

13
General Discussion / Re: MIT concept printer
« on: December 12, 2017, 11:15:36 PM »
I run 60mm/s for most things and drop to 50 when I need precision holes etc.

14
Engraving / Re: How long do you run your laser for?
« on: December 12, 2017, 11:04:05 PM »
pedantic much. yeh I wasnt going yo get into MTBF's and statistics. I was disputing the original quote of needing a rest after 2 hours, I call bollocks to that. To repeat myself its going to get as hot as it will after 30 minutes. Does it matter whether you have ooerated at 1.5hours out of 2 at full temp or whether you operate it for 20 hours straight and it was hot for 19.5 .. sure, by about 20% of total life, assuming that the high temp is of a level that reduces mtbf significantly. If not .. then it makes no deifference at all.

The point is that with active cooling the device is unlikely to get the high temperatures where rapid failure is expected unles the heatsinking is way sub par and at lower managed temperatures there is not a great enough reduction in MTBF that much caution is warranted.
Pulling numbers from my butt, maybe 20000 hours instead of 50000hours at 100C (junction) whereas a decent fan holds it at 70C and MTBF is much still closer to that 50000 mark.
If it is not still raising temperature after something like 30 minutes then the cooling has now matched the dissipated heat, if you can touch it confortably and there is decent thermal conductivity from junction to case then the laser is probably not going to explode any time soon.

15
Engraving / Re: How long do you run your laser for?
« on: December 12, 2017, 04:19:07 AM »
It is only the maximum temperature that matters, not the length of time.This applys to the power supply as well as the laser, I cannot see any way 2 hours could ever be meaningful, it will be as hot as it will ever get after 30 minutes or so, after that it does not care if an hour more or a thousand hours.

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