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Messages - yurtman

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Hi, I'm Jess and I'm running a Joes CNC EVO that I built in 2012. Machining stuff with it is my day job and if you're interested here's my site: cuttingedgecnc.co.uk  
I've been running Mach 3 and I have everyday functionality sorted, but I'm here improve my knowledge and share what I can along the way.

General Mach Discussion / Re: external e stop request false signal
« on: September 18, 2013, 06:26:03 PM »
Can anyone tell me within mach, what will trigger a stall and 'external e stop requested' to be displayed. I don't think it's the watchdog timer as this creates a separate warning window. Surely there can only be a limited number of inputs that mach is monitoring that will result in this error.

General Mach Discussion / Re: external e stop request false signal
« on: September 16, 2013, 02:43:00 PM »
No watchdog timer limit, just the external estop. Is there a diagnostic recorder for input states....the mach 3 history only records 'external e stop request'. Anyone have any diagnostic tips for isolating the false trigger?

General Mach Discussion / Re: external e stop request false signal
« on: September 16, 2013, 02:22:14 PM »
Thanks for the quick reply hood, I didn't realise the mach debounce was redundant with smoothstepper. I will use the ESS e stop filter and see if it has an effect, with the rarity of the problem it may be weeks until I see another problem. I am confused how there could be any noise on this input, would an e stop request warning message be for anything other than a change in state of the estop input?  I think this input has an internal pull up resistor and is pulled down by connection to negative ground, I'm struggling to see how this could be noise issue where the state is maintained by a connection to ground.   

General Mach Discussion / external e stop request false signal
« on: September 16, 2013, 01:03:25 PM »
Hi all,

I'm having an intermittent problem with false e stops at random occurrences during jobs. 'external e-stop' warning is displayed in mach 3, which I can then reset. It is not due to limits, it's just the external e stop. I'm using a gecko g540 and a smoothstepper. I have the e-stop pin of the gecko (pin 10) connected to a rocker switch on my enclosure, with the second terminal wired directly to my power supply negative. I just use this like an enable switch and I have a separate e stop on the enclosure power input. Would this false e stop come from a false low on pin 10 through noise? It is very sporadic, happened twice today and 3 times about 2 weeks ago, both times it repeats and then for days I have no trouble. I have just set the mach 3 input debounce to 2000 to help deal with noise. Could the 'external e stop requested' come from anything else other than this input? Is it possible to record the input states over time to identify if it is noise on this input? Would a small inline capacitor between my rocker switch and pin 10 work/help? I have run a break in wizard for 4 hours today, with debounce at 0, with no problems. It's so frustrating when problems are not regularly reproducible. When this occurred earlier today, I reset the estop and restarted the job from the line of G code I was on pressing 'start from here', only this started the toolpath from the beginning but from the location the spindle was in....wasted a nice plank of french oak (why couldn't it have been mdf!!!). Is there a way to continue a toolpath from the position of the stall/fault?

Any help with this would be very much appreciated, I'm really tearing my hair out!

General Mach Discussion / Re: lumps & bumps
« on: May 31, 2013, 08:52:21 AM »
Thanks for the suggestions. The grub screws are bad, they have soft heads that just allow the Allen key to mash up. I'll be getting new grub screws for sure, and may try Chaoticone's idea for jamming two screw in. It may be a bit tight, I think there's about 4-5mm of thread. As far as loctite compound goes, is 638 OK?

General Mach Discussion / Re: lumps & bumps
« on: May 31, 2013, 07:26:42 AM »
Problem found: the pulley wheel on my X axis had play in it due to a loose grub screw. This was causing a very small delay in the X axis responding to moves, I guess a bit like inconsistent backlash. Thanks for all your help on this, I really appreciate your input.

On a hardware note, I have nema 23 steppers with 3/8 d shaped shafts, and the 22 tooth pulley wheels with 3/8 round bore with a grub screw to keep in place. I have read on Joes CNC forum that some people have glued in the grub screws to stop them loosening, which has worked but I feel isn't an elegant or long term solution. Is anyone else having a problem like this?  Are pulley wheels available with a d shaped 3/8 bore? 


General Mach Discussion / Re: lumps & bumps
« on: May 30, 2013, 05:39:51 PM »
Thanks for the suggestion overloaded, it could explain 2 of the three bumps. I will run the same code tomorrow without tabs and see if this makes a difference. FYI the tabs are 3D tabs in VCarve Pro.

 Hood, I have run other geometry without these bumps , I would expect machine flex to be more consistent. Even with this tool path, there's a similar feature that has been cut blemish free.

Thank you both for your input.

General Mach Discussion / Re: lumps & bumps
« on: May 30, 2013, 01:40:07 PM »
g-code attached

General Mach Discussion / lumps & bumps
« on: May 30, 2013, 01:38:55 PM »
I've just been making my first cuts on my recently finished CNC router. I cut a small table top earlier today, and had 3 small bumps in a profile cut (g-code attached). The timber is maple, I did 15 x 1.5mm passes and each pass had the bump in the same place. I'm confident there are no lost steps as the rest of the geometry was smooth. There is no uniformity to where these bumps are in relation to the rest of the geomtery, and I would expect if there was mechanical culprit for these bumps to be elsewhere in the toolpath. I've taken a close look at the g-code toolpath and this seems to be fine.  I don't think there is any backlash, and the bump positions don't seem to be on curves. Any insight would be much appreciated!

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