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Ross Hendrickson
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Hey, maybe someone can help me here. I have 'slowly' been converting a Proxxon MF70 to CNC and have a V3.0.0 GRBL Shield. I built a shapeoko v1 a long time ago and I'm a little rusty at this point but I can't for the life of me figure out how to get my limit switches to work for homing. I've read the docs here (https://github.com/grbl/grbl/wiki/Configuring-Grbl-v0.9) and a few other tutorials other places.

I assumed my homing switches needed to be on the Axis + end stop lines but if I do that then Homing fails and no Hard Limit's get triggered. (Marlin makes it much easier to see if switches are working). I have three NO switches as I thought that is what I should be using with this shield (I have NC wired ones too, if I need them).

This is the version of GRBL I am using (I will upgrade if I have to, just didn't want to risk changing too much too quickly).

Grbl 0.9i ['$' for help]

I have these settings set
$21=1 (hard limits, bool)
$22=1 (homing cycle, bool)

When I have the NO end stops wired into the Y-, X-, Z- places on the shield then I can trigger this.

ALARM: Hard limit
[Reset to continue]

But in either Z- or Z+ I cannot get home to work. I always end up with the below when I manually 'pretend' to hit Z, then hit XY by physically triggering the end stops.

ALARM: Homing fail

I am assuming there is something dead simple that I have wrong. The shield works (I can move my motors) but is not wired up to 12v or the steppers right now as I want to ensure the switches are working correctly before I try to 'home' the real machine. I have been using USG though I have used Chillipepper w/ this same board in the past.

Any help would be appreciated. Thanks!


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Hey, maybe someone can help me here. I have 'slowly' been converting a Proxxon MF70 to CNC and have a V3.0.0 GRBL Shield. I built a shapeoko v1 a long time ago and I'm a little rusty at this point but I can't for the life of me figure out how to get my limit switches to work for homing. I've read the docs here (https://github.com/grbl/grbl/wiki/Configuring-Grbl-v0.9) and a few other tutorials other places.

I assumed my homing switches needed to be on the Axis + end stop lines but if I do that then Homing fails and no Hard Limit's get triggered. (Marlin makes it much easier to see if switches are working). I have three NO switches as I thought that is what I should be using with this shield (I have NC wired ones too, if I need them).

This is the version of GRBL I am using (I will upgrade if I have to, just didn't want to risk changing too much too quickly).

Grbl 0.9i ['$' for help]

I have these settings set
$21=1 (hard limits, bool)
$22=1 (homing cycle, bool)

When I have the NO end stops wired into the Y-, X-, Z- places on the shield then I can trigger this.

ALARM: Hard limit
[Reset to continue]

But in either Z- or Z+ I cannot get home to work. I always end up with the below when I manually 'pretend' to hit Z, then hit XY by physically triggering the end stops.

ALARM: Homing fail

I am assuming there is something dead simple that I have wrong. The shield works (I can move my motors) but is not wired up to 12v or the steppers right now as I want to ensure the switches are working correctly before I try to 'home' the real machine. I have been using USG though I have used Chillipepper w/ this same board in the past.

Any help would be appreciated. Thanks!

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There is some humor in the motley fool talking about 3D system's upcoming earnings call using a picture of a reprap.
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Great weekend. Made a desk for my SO. Kids had too much sugar. Private VPN, clojure and a dabble of Apache Helix / Spark. Fought the good maker fight. Hopeful for the upcoming week.
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4/16/17
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Got a little case for everything for the little cnc machine. 
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Hey everyone. So, I have built several printers over the years and am now looking at buying my next one and could use some advice.

I want to be clear what I'm looking for in my next one so this may be a bit long. My primary concern is that I want something that I can have printing safely with small children near by (my i3 & delta are not kid friendly). I have just realized that I rarely print anything anymore as I have to do it late in the evenings so I never want to do long prints. I am looking for either an off the shelf or a donor chassis (IE I'll rip out the guts if needed as I have RAMPS + Smoothie spares around).

I have been looking at this as a possible starting point. I would add panels and e-stop trips + change electronics. I can do some machining at home as well so making a mount for an E3D / Probe should not be a problem. The top can be open as I'll just want to close the sides to stop small fingers from trying to touch things.

http://malyansys.com/en/product/m100/

I would prefer to buy an open source based printer in general as I prefer to support those initiatives but I can convert a closed one if needed (not really looking at the Davinci line though). Build volume is of minimal concern so 100x100x100 would be fine. PLA only is fine. I would like some form of bed leveling but I can add it later if needed. Sourcing direct from China is ok if there is evidence of prior successful order history. Kits are ok though I prefer assembled for this one right now (to start). I do not need duel extrusion.

Price range is going to be minimal looking at <$500 to start. I like the Printerbot Play but it is still not safe enough for small kids.

I have also looked at the Einstart-S as a possible starter. Shining3D have a new Einstart-C that is supposed to come out but the entire toolchain/path generation/printer control stuff is locked down completely (which I don't like)

https://www.amazon.com/Performance-Einstart-S-Framework-Accuracy-Stability/dp/B01MR62A6D/ref=sr_1_1?ie=UTF8&qid=1489905170&sr=8-1&keywords=einstart

I have also looked at getting a Solidoodle Press used and then upgrading/fixing it as needed.

Another I've been eyeing which appears to be a Replicator clone/smaller version.
https://www.amazon.com/TECHNOLOGY-X-ONE-Printer-Structure-Touchscreen/dp/B01HZ4HY9I/ref=cm_cr_arp_d_product_sims?ie=UTF8

Basically my question is really are there any other printers out there I should be looking at as possible donors? Thanks for your suggestions in advance.



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And the obligatory music being played by motors. All for tonight. First cut tomorrow. 

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Mill is wired up and working, decided to just roll the dice again on electronics after wasting so much time trying to debug the other set of drivers/board. Going to switch out steppers on the mill for the ones that have a grooved shaft as I noticed some slipping on the others. Now I have to actually build out the enclosure and get it all locked down. sigh so much work ;) Prusa i3 is giving up the ghost in a good way.
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1/15/17
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I wrote some thoughts down on handling uncertainties while developing large software projects. 

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Everyone should read this, no matter who they voted for. One cancer patient shares why she needs the Affordable Care Act

Tech culture journalist Xeni Jardin (@xeni) detailed her insurance struggles throughout her cancer diagnosis which inspired others to share why, for their lives, Obamacare is vital.

Read it here: https://twitter.com/i/moments/819598653778182145
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