Thanks for the reply, my plans is to build one Flying Gantry from Rockcliff. I have decided for this CNC model because it will be used for wood RC airplanes. And with this model I can go longer to cut fuselages for longer airplanes.
I'm planing to build this CNC with 47" long x 24" wide (1200mm x 600mm)
It has an opto-isolated breakout board built in, as well as 4 drives and good support. I set one up and it went pretty smoothly, although you're pushing the envelope trying to run such a large machine on such small motors. Run the motors in parallel mode, which will give you the best torque, and give it a 48v power supply, which will get the most out of the 540 drive.
although you're pushing the envelope trying to run such a large machine on such small motors.
Hi Andrew Werby,
Thanks for the reply, because I don't understand nothing about CNC machines all the help that I get is welcome.
As I stated before the main purpose of this machine is to cut RC Airplanes parts, and if I want to cut 1 meter fuselage using the rockcliffmachine Flying Gantryhttp://i118.photobucket.com/albums/o92/antfag/cnc.jpg I need at least 1200mm long CNC since the maximum cut throw will be around 1 meter (I think). Unless there is another way to cut longer parts with smaller Router CNC any trick? Can I cut half them pull back and cut the other part? is this possible?
And Andrew, as I mentioned before I don't understand nothing about CNC, I'm reading a lot to get the best information possible, but more I read more confused I get everyone have different opinions. What kind of characteristics motor/drive do you think this machine needs?
but that's a pretty large machine to run on such small motors. I couldn't see your photo (it just hung) but to have any stiffness a gantry that large will have to be somewhat heavy. It needs to carry the Y and Z axes, plus the spindle, and cut with a minimum of deflection. To move this around quickly, with the ability to change directions without losing steps (the bane of stepper systems) you need motors that have enough torque at
high speeds. Steppers typically exhibit their best torque at standstill ("holding torque") which is how they are rated (that's the 200 oz-in). When they are turning, it falls off rapidly with speed.
While it's possible to "leapfrog" your cuts so as to do large parts with a small machine, it's easy to lose registration that way, and it's to be avoided if possible. Usually, you find the NEMA-23 200 oz-in motors on small mills like the Taig; they work fine for that, but for something as large as the machine you're building, something like a NEMA-34 650 oz-in stepper motor would be preferable, if not a servo. Wood likes to be cut rather quickly, so if you've geared down the machine or used fine-pitch screws to accomodate your small motor's lack of torque, you risk charring from excessive dwell.
If you haven't bought anything yet, spend some more time researching the sort of machine you want to build (this is a good place to do that) and see what other people who have built a CNC router that successfully cuts out the sort of parts you're making have arrived at.
i have a question.....firts i don't know where to post it on here and second its not someting that is asked every day. so anyway, i own a chainmail business. ido several different weaves and am making my rings by hand for the last eight years. what i want to do is build a machine that will coil my rings in different sizes and cut them as well as dump them in a bucket. i have some ideas as to how to go about it but i am looking for better ones. i have always thought that the more ideas you have the easier it is to find the final one that works best. also if anyone knows of a way to make this machine weave them together as well that would be cool. i have several orders that it would really cut down production time if i could build this so thank you in advance for any help that you may offer.