Success!! PCB with Shapeoko

xpix
Posts: 218
Joined: Thu Sep 06, 2012 6:47 am

Re: Success!! PCB with Shapeoko

Post by xpix » Mon Dec 17, 2012 5:37 pm

Will Winder wrote:
edwardrford wrote:The trick is to lock the motors when you're doing a tool change. Right now the motors are only activated when they are running. There is a thread about a hack for grbl that keeps the motors enabled all the time. That might help. I believe atomsoft posted it.
-Edward
This is now a default feature in the latest version of GRBL (0.8c), just set "$7=255". More details are here: https://github.com/grbl/grbl/wiki/Configuring-Grbl-v0.8
Thanks Will and Edward, the trick to lock the motors give me the plan to drill the PCB. When the first gcode file finished (etc) then drive to 0,0,50 (mm) and change the tool. The Steppers hold very good and my Drivers was warm but i think only handwarm.
First a little video:

http://www.youtube.com/watch?feature=pl ... gz1tyozCqk
Attachments
Foto.JPG
PCB drilled
Foto.JPG (490.4 KiB) Viewed 3446 times

levlandau2
Posts: 187
Joined: Tue Apr 17, 2012 1:52 am
Location: Minneapolis, MN, USA

Re: Success!! PCB with Shapeoko

Post by levlandau2 » Wed Jan 02, 2013 7:36 pm

Hello,

Can anyone who has implemented the $7=255 setting give some feedback on how well it works? I want to use this to lock the axes when I am changing bits, but am afraid of burning out my drivers (I have heatsinks and a fan to cool the drivers).

To avoid damaging the drivers, does one turn off the power supply to the steppers when the mill is not in use? This seems like it would be a critical step that I should not forget to do...

Would it be a better idea to toggle the $7=255 setting, so that the drivers do not overheat accidentally?

Err, it would be nice to have an idiot-proof way to ensure the stepper drivers don't overheat....? Would the heatsink and fan provide adequate cooling ??

cvoinescu
Posts: 4442
Joined: Thu Jul 19, 2012 6:50 pm
Location: Camberley, UK
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Re: Success!! PCB with Shapeoko

Post by cvoinescu » Wed Jan 02, 2013 8:13 pm

I think the drivers reach thermal equilibrium in a matter of minutes, so if your job takes more than ten minutes or so (and most do), your drivers aren't going to get any hotter. The motors are a different story, as they have much more thermal mass, but, again, they will probably reach the equilibrium temperature during a job (say, an hour or so). Ideally, you would reduce the current instead of turning the drivers off -- to a point that's safe to allow a tool change, but allows the motors to cool down. Unfortunately, that's not possible with the Pololu drivers without a small modification (which I'm going to make on mine as soon as I get a chance). BTW, I like that Marlin supports both a configurable timeout and a command to turn the motors off -- exactly what you need. I'm sure it's safe to mess with the $7 in GRBL, too.
Proud owner of ShapeOko #709, eShapeOko #0, and of store.amberspyglass.co.uk

wlanfox
Posts: 74
Joined: Sat Oct 20, 2012 10:49 am

Re: Success!! PCB with Shapeoko

Post by wlanfox » Wed Jan 02, 2013 9:33 pm

xpix,

Great information, thanks for sharing... What end-mill did you use to mill the MDF surface, been having a hard time finding wide end-mills with 1/8 chuck, all I find are end-mills with diameters as big as the 1/8; anything larger starts being the 1/4 chuck, FYI I am using the the same Proxxon rotatory tool.

Good conversation about $7=255 I also run into this situation with the steppers shifting a bit when de-energizing or energizing the motors while changing the tools.

As mention in here, I don't see any temperature rise in the controllers from doing the isolation job pass , but if you want to keep the cool, do get some good heat-sinks and add a fan. this has work great for me.

Thanks and happy milling :)

xpix
Posts: 218
Joined: Thu Sep 06, 2012 6:47 am

Re: Success!! PCB with Shapeoko

Post by xpix » Thu Jan 03, 2013 7:44 am

wlanfox wrote:xpix,

Great information, thanks for sharing... What end-mill did you use to mill the MDF surface, been having a hard time finding wide end-mills with 1/8 chuck, all I find are end-mills with diameters as big as the 1/8; anything larger starts being the 1/4 chuck, FYI I am using the the same Proxxon rotatory tool.

I use this Endmill and have no Problems. For ur information, i life in Germany and we have a metric system ;) Here is my ebay Dealer and the mill what is used:

http://www.ebay.de/itm/VHM-Fraser-2-sch ... 1808wt_816

Nu yes, i have the same Problem ... more as 1/8" is impossile. For pocket Milling u need some passion, may u open a new thread. It's a Problem and i need also a Solution for bigger endmills. ;)

To the temperature problem, i have the normal Steppershield and all Drivers set to 320mA (also the DualY with 2 Steppers one one Driver) no Problems at all, my Driver and Steppers only handwarm, also after one hour run. Sure, every Driver use a cooling plate.

wlanfox
Posts: 74
Joined: Sat Oct 20, 2012 10:49 am

Re: Success!! PCB with Shapeoko

Post by wlanfox » Thu Jan 03, 2013 8:06 am

oh yes... I meant the 3mm chuck ;), I found this after seen this thread, I order a set and will try the 6.5mm pocket router bit.

http://www.ebay.de/itm/Proxxon-Straight ... _500wt_923
http://www.ebay.de/itm/Proxxon-10-piece ... 243wt_1165

xpix
Posts: 218
Joined: Thu Sep 06, 2012 6:47 am

Re: Success!! PCB with Shapeoko

Post by xpix » Thu Jan 03, 2013 8:19 am

wlanfox wrote:oh yes... I meant the 3mm chuck ;), I found this after seen this thread, I order a set and will try the 6.5mm pocket router bit.
Hmm, with a 3.2mm shaft is possible to use this with a Proxxon IB/E ... nu give a try, im very curios to read about ur experience ;)

xpix
Posts: 218
Joined: Thu Sep 06, 2012 6:47 am

Re: Success!! PCB with Shapeoko

Post by xpix » Fri Jan 18, 2013 1:03 pm

I give a new try with a vacuumtable and a china Spindle. The result is great, i checked this under my USB Microscop and it's awesome ;)

I got this things:

- Endmill: http://www.sorotec.de/shop/product_info ... l-30-.html
- Vacuumtable: http://www.ebay.de/itm/130759680773
- Vacuumcleaner: http://www.ebay.de/itm/400390219554
- China Spindle 180W http://www.ebay.com/itm/251201710796
- Spindle Ctrl: http://www.ebay.de/itm/110928062284
- Measureclock: http://www.ebay.de/itm/350673838033

Some tipps for a good result:
- To balance the vacuumtable i use a 'Measureclock', i dont know the word in english ;) Put this on the Z-Axis and drive in X- and Y- Direction. Read the values.
- First i had 0.2mm different from left to right, u can use a normal paper. A Page is 0.1mm thick, i put 2 pages under the right side from vacuumtable and it was perfect balanced.
- I used only eagle with pcb-gcode: http://groups.yahoo.com/group/pcb-gcode/ In this program u can used an own configuration file to make a feed hold at M06 (string OPERATOR_PAUSE = EOL + '!' + EOL + "M06 ";).
- I build one for grbl and copy this to pcb-gcode/profiles/shapeoko.pp. Then call ulp-script for settings and choose this profile. (untestet grbl code!)
- To change the drill is easy, i drive Z-30 in gcode and make a feedHold (shapeoko.pp), change drill and put under the drill a toolbit with length 30mm. Touch new drill on the top from this bit and tight thats all. Send '~' and drill prg run ...

just patience ;)

wlanfox
Posts: 74
Joined: Sat Oct 20, 2012 10:49 am

Re: Success!! PCB with Shapeoko

Post by wlanfox » Sat Jan 19, 2013 7:50 pm

Nice, is there any pics of new results? very interested on your results. I order a vacuum table but still waiting for shipment. How do you like that spindle over the Proxxon rotatory tool?? I have been playing with the idea of getting one of those, but I seem to have read mix results, as in no benefit over Proxxon specially if doing more then just isolating routing and milling other materials...

-wlanfox

xpix
Posts: 218
Joined: Thu Sep 06, 2012 6:47 am

Re: Success!! PCB with Shapeoko

Post by xpix » Sun Jan 20, 2013 5:30 pm

So, here the result ;)
ImageUploadedByTapatalk 21358701800.124425.jpg
ImageUploadedByTapatalk 21358701800.124425.jpg (135.55 KiB) Viewed 3245 times
I wait for my little camera to find the right place for first drill. But this a another story ;)

Hier my shapeoko with vacuumtable and china spindle:
ImageUploadedByTapatalk 21358702961.044041.jpg
ImageUploadedByTapatalk 21358702961.044041.jpg (153.9 KiB) Viewed 3245 times
ImageUploadedByTapatalk 21358702985.395636.jpg
ImageUploadedByTapatalk 21358702985.395636.jpg (159.29 KiB) Viewed 3245 times

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