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Warco VMC mill conversion
treb63:
Also the crappy lubrication system has had a complete overhaul and a proper pressurised system fitted although the pump has been retained the injectors now are all correctly graded restrictors thereby ensuring all lube points 'get a bit'.
A couple of shots of the first two things machined, a little test piece and a exhaust anti vibe mount.
Brass_Machine:
Hiya Treb!
First, welcome to the collective :borg:
2nd, that is a nicely done conversion. You can never have too many build logs on CNC conversions. I am always looking at them to see what I can do to mine (since mine isn't even close to complete and I am going to tear it down and start over)
Looks like it has a one shot style oil system? I see some tubing... Got any closer pictures?
Eric
Brass_Machine:
--- Quote from: treb63 on March 30, 2014, 02:04:35 PM ---Also the crappy lubrication system has had a complete overhaul and a proper pressurised system fitted although the pump has been retained the injectors now are all correctly graded restrictors thereby ensuring all lube points 'get a bit'.
A couple of shots of the first two things machined, a little test piece and a exhaust anti vibe mount.
--- End quote ---
Looks like you were posting the same time as me... I have been trying to figure out how I want to do mine.
treb63:
Now for the electrics, not my forte.
I have used these Nema 34's 4.6Nm for the X and Y at 1 to 1 and direct drive. http://www.cnc4you.co.uk/index.php?route=product/product&path=20_95&product_id=211
This motor for the Z axis Nema 34 8.7Nm firstly at 1 to 1 then now at 2 to 1 gearing http://www.cnc4you.co.uk/index.php?route=product/product&path=20_95&product_id=187
I have used these drives http://www.cnc4you.co.uk/index.php?route=product/product&path=82&product_id=29 rated at up to but not exceeding 80V
The power supply was this one http://www.cnc4you.co.uk/index.php?route=product/product&path=81&product_id=33 48V 12A 600W
The interface to the pc running Mach3 was via a UC300 which I can wholeheartedly recommend, it will do everything you ever need for possibly more than 1 machine also via usb no old parallel port needed so My pc is a cheap net top style asus revo.
However my question to you stepper motor experts out there would be that with these motors I was hoping to be 'over the top' with the power available but I have found that I am a little prone to loosing steps and the motors start to scream and stall. This usually happens when the motors are trying to set of from rest into a rapid move of more than one axis at once or I am rapid jogging one axis and I also select another axis via a joystick control to also rapid jog this starts at least one of the motors screaming and loosing position.
I suspect that the power supply is not up to the job and at 48v is dipping under the load of two motors running in rapid (1500mm/min) it could also be uprated as the drives could take up to 80v max so would this help in delivering more torque out of the motors? Any thoughts in this matter would be gratefully received..
treb63:
Mr Brass,
The lube pump supplied is ok to use however the design of the system is crap, in order for the system to work correctly all lube points must receive the oil pressure for the same amount of time in order for the lube to find its way to the necessary points correctly.
The original system has pipes with no restriction's so what can and does happen is the lube will always find its way out of the biggest gap or least restriction first.
What needs to be done is fit restrictors to each of the lube point as close as is possible so the pump develops the pressure and holds the pressure in the pipes feeding these points, these points then leak out at a predetermined amount (more needed for cast iron slides than ballnuts) there by ensuring all points receive oil.
The system is not cheap but I think Arc euro trade stocks all the items individually so it can be built up sequentially and when driving these soft cast iron slides faster than they were designed for I think it is essential.
A system like this design is what I've acheived
http://www.arceurotrade.co.uk/Catalogue/Machine-Spares/One-Shot-Lubrication-System#One-Shot-Lubrication-Parts-for-Myford-ML7
regards
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