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  1. #49
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    Default Re: OmioCNC report

    Cheers matey.

    I finally got one ordered a few days ago - looking forward to playing with it. I decided to just go with the standard 4 axis for now - I don't know much about 4 axis work yet so I figure the standard unit is good enough to try it out and if I like it/find myself wanting to do more I can just upgrade it later.



  2. #50
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    Default Re: OmioCNC report

    This week's update: lubrication. Bought a couple of those el cheapo locline mister rigs from fleaBay (about AUD20 apiece) and they turned up. Used the printer to make a collar to hang them off the top of the spindle, had a random solenoid and bought a bunch of 6mm PTC gear to get air up to them.

    Just like every other time I've touched this machine, I learned a bunch of things.

    - Opening the control box to see what where I'd mount a new PCB to drive the solenoid and probably a couple other things of breakout outputs, I note that there is already a big choke on the spindle output. The spindle hasn't played up again but then, I've not had it running a long job since last time either.
    - Doubling up those misters with a t-piece requires a bit of juggling to get them right, so they don't siphon off and dribble out as soon as you switch off the air.
    - They also have woeful suction from their venturis. I could just be super careful about the height of the coolant tank but I really wanted to leave it on the floor.
    - A small pump for the coolant worked beautifully. Until it died because it was an air pump and couldn't handle the load of the liquid. Oops. $5 from fleaBay for a windscreen washer motor, will resume this project when it turns up.
    - I forgot how much you have to move the spindle in its mount to allow for tooling and fixtures. Turns out when the workpiece is right on the bed and you're using short tools, it's pretty much flush at the top with the clamp - so my collar to mount the misters is going in the bin and I'll have to mount them differently.
    - these machines have a generous cable chain size, there was room for a 4mm ID tube for lubricant and 6mm ID tube as well as the spindle coolant hoses in there amongst the electrics. Nice touch.

    Nothing too crazy and nothing much broken this time. The pump was a leftover from an old job, a mini sampling pump and I have a few of 'em spare so no tears shed.

    But automated air blast and misting? Going to be pretty nice when it's done and sorted, so far looking at under a hundred bucks too.

    @RCaffin: you'll be pleased to know that I couldn't be bothered dragging out the photo etching kit for the breakout board breakout board - power drivers to be triggered by the BOB and drive the solenoid etc. 0.1mm x 20º v cutter and LineGrinder haven't convinced me yet, and I'm having problems getting the NC drill file out of Altium. But I'm now curious to see just what I can get out of this thing so I will persist. Thanks for correcting me in the other thread.

    Last edited by dharmic; 09-13-2015 at 02:08 AM.


  3. #51
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    Default Re: OmioCNC report

    I have a pair of those sort of misters waiting to go on too. What air pressure were you running them at?

    I was thinking of making a bracket that attaches to the body of the spindle itself rather than the spindle clamp or the z axis carriage. That way when you slide the spindle up or down in the clamp, the misters move with it.

    I would be very interested if you post up details of how you automate the air/mist.



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    Default Re: OmioCNC report

    I'm running at full compressor pressure (8 bar / 120 pounds) at the moment, just because I had cranked it up and up and up to try and get the venturi working hard enough to drag coolant up from the ground level.

    I have done what you're talking about, I printed a clamp that goes around the top of the spindle. Unfortunately, when the spindle is low enough to hit thin work with short tools, the top of the spindle is flush with the top of the spindle mount, so no room for the clamp. Bugger.

    I'm now looking at removing the spindle mount and just drilling/tapping a couple of M3 holes in the sides of the mount for the mister blocks, then putting it back on the machine.

    I will post up details of the drive setup when it happens. The idea is simply to have the M-code for mist lube wired through Mach-3 to one of the digital outs on the BOB. These are open circuit normally, then pulled to ground for active. That will drive a P-channel MOSFET with a 12V source such that the output will be open circuit normally, +12 active: great for just hooking the little pump and solenoids into.



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    Default Re: OmioCNC report

    Ah fair enough - think I'll have to get it in my hands first before coming up with a solution.

    While you had the spindle apart, did you happen to look whether or not it's earthed properly on this one?



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    Default Re: OmioCNC report

    Didn't have the spindle apart, just the control box - and no, earth is disconnected.



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    Default Re: OmioCNC report

    Oh well, that'll be job number 1 on the list then! I have a bundle of 4 core shielded wire waiting to go on anyway.

    Cheers!



  8. #56
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    Default Re: OmioCNC report

    Just out of interest, I just designed this for the mist sprayers I have... the bracket is 15mm thick, do you think this would work above the spindle mount? I see you were using the dust bellows on the Z-axis, have you tried without? I believe it gives you another 60mm (so 30mm each side) on the Z travel... Plus I guess a spoil board would raise things up too.







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    Default Re: OmioCNC report

    Looks familiar!

    Here's a photo of mine and why it won't fit. That overhang of the spindle out of the top of the cradle is about 5mm.

    No, I don't want to remove the bellows - they're on there for a reason. Maybe it's not so bad for dust, but once swarf starts flying around the place I want them good and covered.

    I will probably end up screwing the mister blocks into the spindle mount between the spindle mount screws. Not too hard to do.

    Attached Thumbnails Attached Thumbnails OmioCNC report-img_20150914073555-jpg  


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    Default Re: OmioCNC report

    Right so I have most of my order (for some unknown reason DHL decided to split the order and haven't delivered it all at once - hopefully the bottom half of the machine will arrive this afternoon).

    I do however have the spindle and electronics, along with the Z/X axis gantry and all those bits and pieces, so I decided to take a look at the wiring.

    Good news is that the spindle does already have a 4 pin plug and it is indeed already connected to an earth point on the inside of the cap:




    The bad news is that for some reason, they have decided to run a 3 core cable and thus leave the earth unconnected to the VFD.... slightly confusing why they would have the earth on the spindle wired up and the earth on the VFD left empty. I have emailed them to ask why they are doing this, and also ask for a 4 pin connector to be sent out so that I can rewire using my own 4 wire shielded cable.... we'll see what they say.









    Anyway, still waiting for half the machine but so far I'm impressed with the Z-Axis and X axis gantry, huge improvement over the X6-1500GT in rigidity is already quite evident. I'm quite excited to get it all up and running and have a go. Hopefully it all assembles nice and square.



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    Default Re: OmioCNC report

    Still waiting for the rest of my machine, but in the mean time I did get a response from Grace about the earth....

    To summarise, she said that they are confused why people ask about 4 core cable with earth and that they think they know better than the manufacturer, that it is disconnected due to noise affecting the system: "Spindle connects with “grounding" of VFD , will generate great interference for stepper drive in particular USB."

    Well, I don't profess to know more than the manufacturer, but on that topic the manufacturer of the VFD shows a very clear (and not optional) wiring diagram - of note is the top right corner where you can clearly see the "E" of the VFD should be connected to the spindle and to ground.




    As shown in the pics above, the Spindle manufacturer also provides a 4 core plug and an earth connection to the spindle case. Seems to me like both manufacturers are of the opinion that an earth needs to be hooked up....

    I did point out that the earth is necessary for safety as a short in the spindle will turn the whole machine into a 220v live wire, and their reply was that "Earthing is for safety, that is paramount. But for how to connect earthing of a machine, that need theory and practices to make tests."

    Well, the machine isn't earthed.... There is no electrical connection to ground at all other than the (non-existent) spindle ground. So clearly safety isn't paramount?

    Anyway, I haven't heard of anyone that has corrected the VFD wiring as per manufacturer instructions having noise issues - we'll see I guess.



  12. #60
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    Default Re: OmioCNC report

    Depends where you connect that earth, I guess. If you star point wired the spindle connection to the point where the control box is earthed, and also the VFD, it might be ok. They do try and keep the controller on a floating ground to prevent earth loops and other interference problems with the USB connection.



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