need some point of view on cnc package

[ataxy]

since this is the first kit i will buy i would need a bit of advice and point of view on the two kit i am tilting for first the Xylotex with 425oz motor and second the Keling with 495oz motor both of them are 4 axis but the Keling is more powerfull with 70oz more of torque per motor wich i guess will mostly be noticible on the z axis
the package would be to retrofit a Bf-20 type machine wich sits right between a x2 and a x3 at 260 pounds price wise both are about the same but i could also get a 425oz kit from Keling for less then the Xylotex

[ZipSnipe]

Bump , I too seeek either package.

[bryanrabb]

you will not get as much out of the 425 oz xylotex kit, low end torque, but not when you go fast. I was disappointed. Now I am going with geckos, 70v 10a power supply, and the CandCnC boards.

[pminmo]

The Keling setup will out perform the Xylotex when doing rapids considerably if the motor supply voltage max is utilized. Without getting into depth, there is two aspects of stepper motor power that one needs to consider, low rpm where you are normally cutting, and high rpm rapids. Most people are discontent by high rpm rapids, and think they need big motors. Big motors may help the higher rpm's, but the biggy is motor supply voltage, and motor coil inductance. With the Xylotex, you are going to be limited to 24V the Keling 40V. The Xylotex motors also have a considerably higher motor inductance which compounds the problem of the motor supply.

[ataxy]

so from what i get
low torques goes to kelling
high torques goes to both
but acceleration goes to kelling
is that it
so kelling is the answer yes, no or not quite?

[ger21]

Not quite. The Keling comes with a 24V power supply. You'll need a 36-40V supply to actually see the higher speeds.

[ataxy]

ok so uppon using a bigger power supply the kelling is a better choice
so i could probably ask them if the would mind selling me there package with this power supply (KL-300-36 36V/6.6A) and charge me a 20$ difference for it
and how about the 495oz to 425oz package will it make a huge difference that 70oz?

[Glacern]

Those last few ounces will matter in rapids and under heavy loads. But it's more important to focus on the optimal power supply voltage.

24v is grossly underpowered for a mill setup, so the Xylotex is out. 36v is better, but at this price range, I'd consider stepping up to a 48v supply. IME, 48v is the ideal voltage for most stepper motors. Lots of high speed torque without overheating. Anything higher, and you may need heatsinks and fans for the motors, and power supply availability is limited.

The Keling kit you mentioned comes with KL-4030 drives, so you'll have to upgrade to KL- 5042 drives if you want to utilize a 48v supply. I'm not sure what they're charging for a complete kit using these drives, but it's probably approaching Gecko price range.

[ataxy]

ok so
kl-5042 x 3 = 78$ x 3 = 234$
STEPPER MOTOR 495 oz-in x 3 = 59$ x 3 = 177$

so 411$

Gecko G201 x 3 = 107$ x 3 = 321$
STEPPER MOTOR 495 oz-in x 3 = 59$ x 3 = 177$

so 498$

basicly the advantage i get is that the gecko drive can support 80v compared to the kl-5042 wich support 50+v,i dont know how much + does the + in 50+ mean but lets say it would be fine for a 48v psu so getting the kelling would leave me with enough money to grab the KL-300-48 48V/5A, now would this be enough to drive the three 495oz motor at the same time as i want to use my converted mill for 3 axis not 2.5 axis work, well i will use it for 2.5 but i want to be able to do full 3 axis

[pminmo]

Spend the extra for the gecko's. Goto a 64V (or around) power supply. You won't look back.

[ataxy]

Originally Posted by pminmo Spend the extra for the gecko's. Goto a 64V (or around) power supply. You won't look back.

yeah well with two kids to feed you have to put some limit to your spending
so now my question would be in what way would i not look back, by that i mean are whe talking about having a G00 of 35ipm while with the gecko and 64v psu i would get 90ipm or are whe saying 40ipm cuz if the spending will offer me only a 10% advantage then i do not see the advantage but if whe are talking more like 40%+ then that boost in capacity might be worth it

[pminmo]

Not to cop out, but there is no easy or definitive answer. You don't have real long travels, so top perfromance rapids may not be an issue.