[idtkid]

Here is what I am thinking of running, can anyone confirm my numbers?

3 x KL23H2100-30-4BM
1 x Gecko G540
and
1 x 48V 7A power supply

1, is this an advisable setup?
2, if I run this direct drive with 5TPI screws what IPM can I expect (on an X2 X and Y axis) at best?
and 3, can I expect the full 30lbs of cutting force?

Thanks in advance guys!

[idtkid]

bump (hoping to confirm and purchase today)

[Crevice Reamer]

Here is what I am thinking of running, can anyone confirm my numbers?

3 x KL23H2100-30-4BM
1 x Gecko G540
and
1 x 48V 7A power supply

1, is this an advisable setup?

NO! I know bigger sounds better, but it is NOT. Larger motors than needed result in SLOWER speed. The motor you have chosen runs best at 85V. That's more than even a G203V can handle. It will be seriously undervolted at 48V and rapid speed will suffer.

2, if I run this direct drive with 5TPI screws what IPM can I expect (on an X2 X and Y axis) at best?

Much slower than with the motor I recommend for the X/Y of X2. The X2 table weighs only 15 pounds and you are using very low friction ball screws. Doubling the needed torque will only slow things down.

3, can I expect the full 30lbs of cutting force?

Figuring cutting force is much more complicated than just dividing oz in by 16. Just for starters, you have to factor in the gearing of the 5TPI screw, which now has raised that 30 LBs to 150 pounds. THEN, You have to realize that torque and force are two different things etc.

With a 270 ounce motor you will have PLENTY OF CUTTING FORCE--more than the rigidity of the X2 can ever use.

Here's what I recommend for the X2:

$299 G540 http://geckodrive.com/product.aspx?c=3&i=14469
$078 Two $39 KL23H276-28-4B 270 oz motors for X & Y
$049 One KL23H284-35-4B 387 oz motor for Z
$060 One KL-350-48 48V/7.3A power supply.
$010 Estop switch
$007 3 Home switches
$009 Straight thru parallel computer cable.
-------
$512

$149 Mach3 license when purchased with motors.

All of this is available from Keling:

http://kelinginc.net/

CR.

[idtkid]

Hey thanks alot CR. I trust you on the cutting force and that it will be more than sufficient for the X2.

Any rough guess as to IPM that can be expect with the 270s and my 5TPI ballscrew?

[Crevice Reamer]

Hey thanks alot CR. I trust you on the cutting force and that it will be more than sufficient for the X2.

Any rough guess as to IPM that can be expect with the 270s and my 5TPI ballscrew?

How fast is your computer? Demo Mach3 is limited to 25Khz. Are you running licensed version?

At 25K rate, You will get 1,500,000 pulses per minute. 200 steps per motor rev, times 10 microsteps times 5 TPI = 10,000 steps per inch. 1,500000/10000 = 150 IPM. But WAIT, you are using the fabulous G540--It has micro to full step morphing.

Your X rapids could well be a lot MORE than 150 IPM. Of course the little Y axis will not have time to get up to full speed before reaching the end of travel. Actually NONE of the X2 axes are long enough to get up to full potential rapid travel, but this combination will move them PDF.

The Z axis is a whole different horse. NOW you have to consider the effect of gravity in addition to just overcoming inertia and friction. This is why I recommend more torque here, and Z axis rapids are usually a little slower.

With more available pulses per minute, possible rapid speeds go up.

CR.

[idtkid]

thank you thank you. As long as I can expect at least 60ipm thats perfect. Thanks for the formula as well! Your a huge help on this board

[rwoynaro]

Hey CR:

Total machining virgin here, thanks very much from me too for the list of motors/ps and controller setup from Kelling for the X2. I'm gonna get exactly what you indicated.

Would you be good enough to make a similar list using CNCFusion kits for the best setup to mount the motors and the best screws etc for the X2 using the parts you had indicated from Kelling ?

I might as well just get what you suggest and I won't go wrong ! I have no machining experience, but alot of ideas about stuff I wanna make, and I wanna learn, so I may as well jump right in. I can handle the wiring side no problems. Thanks again for your time, I appreciate it.

[Crevice Reamer]

Hey CR:

Would you be good enough to make a similar list using CNCFusion kits for the best setup to mount the motors and the best screws etc for the X2 using the parts you had indicated from Kelling ?

Hi rwoynaro. Welcome to the Zone!

Sorry! I don't understand what you are asking for here. Please explain.

CR.

[hoss2006]

If you can hold off for a little while, it looks like Keling has a new motor in production thats perfect for the G540,(no add to cart button yet)
KL23H2100-35-4B (1/4” Dual shaft with a flat) 318 oz-in
3.5 Amps and 54Volts.
Should be worth the wait, probably not long.
No other motors match up as well than these.
They are offering a g540 4 axis package with the 318's already so it may be very soon.
Hoss

[hoss2006]

Total machining virgin here,

We all have to start sometime. Do yourself a favor and watch all 10 of the MIT Machine Shop videos.

No cnc information in them but chock full of shop tips and procedures to keep you safe.
Hoss

[5artist5]

Keling is saying that they will have them in 15 days.

[rwoynaro]

Hi Guys: First, Hoss thanks for those links on the vids. I have watched them all 2x now after you first posted them and I learned tons from them. I never knew what a parallel was until I watched it. I was hoping to find a good reco for the appropriate stuff to get from CNCFusion to mount the stepper motors on an X2. Reading the suggestions from time to time, the Kelling setup that CR was good enough to post combined with the info you have on your home page seems to me to be enough info on a good setup for the controller, power supply and the motors to use on an X2. But looking at CNCFusion's page, it looks like Kit # 4 would have the right stuff to mount the motors and I have seen videos on YouTube where someone actually walked through the process of installing the X,Y, and Z brackets, so that should be no problem. But they also list a pre-loaded ballnut option and zero backlash coupling options as well. Should I go with just the kit # 4 or also the pre-loaded ballnut and zero backlash couplings as well ? is the shaft diameter on the motors you and CR suggested the right diameter for those couplings ? Sorry for the inept wording last time, I think this is clearer as to what I was after. Thanks.

[Crevice Reamer]

...they also list a pre-loaded ballnut option and zero backlash coupling options as well. Should I go with just the kit # 4 or also the pre-loaded ballnut and zero backlash couplings as well ? is the shaft diameter on the motors you and CR suggested the right diameter for those couplings ? Sorry for the inept wording last time, I think this is clearer as to what I was after. Thanks.

Yes! The Preloaded Ballnuts are well worth the extra money, as are the Helical couplings. The Motor shaft sizes are 1/4 inch and will fit the CNCFusion kits.

CR.

[rwoynaro]

Perfect!!... Thanks very much, I really appreciate your input. I'll post when I get it all together and then on to making some swarf !!