[modelaratrod]

I'm trying to figure out the best gear ratio for a 5' x 10' CNC plasma table.

Current gear ratio is 3.5:1 with belts and pulleys w/ 135oz steppers @ 2 amps

I'm trying to get more speed/ torque as the current steppers stall around 100 ipm.

New steppers "KL23H2100-35-4BM"

I can't find RPM specs for this motor.

Specs from Automation Tech

NEMA 23 Frame, KL23H2100-35-4BM 570 oz In. Hybrid Stepper Motor 1.8° / 200 Steps Per Rev. 3.5 Amps Current, 4-wire, Bi-polar, 1/4" dual shaft,

I'll be running them @ 3.5 amps

Anyone have the rpm for this stepper? Or anyone using this stepper? @ what gear ratio?

Any help would be greatly appreciated.

[awerby]

The motors you've got currently sound like small ones for a large machine like that. The replacement motors will have more low-speed torque, which is good, but whether they will go faster depends on factors you don't mention (and which aren't on the Automation Tech site) like induction and voltage. A torque curve chart would be good to look at as well, to figure out the sweet spot for your gear ratio. You don't say what kind of driver you're using, or what the specs on your power supply are, but that determines how much voltage you can give them without blowing the drives. In general, the more voltage you give them, the faster they will go (up to a point) and the lower the induction the more responsive they will be.

[modelaratrod]

Here's the driver specs

Model Number 3540M
Part Number 1000-107 Supply Voltage 12-42 VDC Supply Voltage TypeDC
Control Modes Step & Direction
Output Current0.4-3.5 A/phaseCommunication Ports NA Encoder FeedbackNoStep Resolution
Half Microstepping
Idle Current Reduction50%

Power supply PS430 4 amps 30 v

[awerby]

That doesn't seem like the right power supply to use with that driver. If you're running these motors at 3.5 amps per phase, what happens when two of them have to run at the same time, with this 4 amp supply? Also, it doesn't deliver enough voltage to run your motors at their full potential speed; a 40v supply would give significantly better performance.

Have you already bought all this stuff? If not, I'd suggest getting a Geckodrive G-540 instead of that driver; it can take up to 50v, which would run your motors a lot faster. Even if you have to use that driver, getting a different power supply, that can supply 10 amps or so at 38v, would give better results: PS-4N38 - 400W 38V Power Supply - AnTek Products Corp

[modelaratrod]

Here's a quote from the manufacture "If you need information about choosing a power supply, please read Choosing a
Power Supply located on page 12 of this manual. The PS430 from Applied Motion
Products is a good supply for this drive."

Features
• 30 VDC 4 amp unregulated motor supply
• 5 VDC ±5% 500 mA regulated logic power supply
• fuse protected outputs
• screw terminal AC input connector
• 120 or 240 VAC, 50-60 Hz
• power on LEDs
• screw terminal connectors
• made in USA
• ideal for use with A.M.P. step motor drives:
1335, 2035, 2035 O, 3535, 3535 O, 3540 M,
3540 MO
• includes mounting holes for 057A oscillator/interface
and one 2035, 2035 O, 3535, 3535 O,
3540 M or 3540 MO drive on side panel
Description
The PS430 is a linear, unregulated DC power supply
designed for use with Applied Motion’s step motor
chopper drives model numbers 2035, 2035 0, 3535,
3535 0, 3540 M and 3540 MO. The PS430 can also
be used with the 5560, 7080 or 7080i drive in applications
not requiring maximum power.
The PS430 provides the user with a precise, wellregulated
5 VDC power source for logic circuitry.

[modelaratrod]

It's an unregulated power supply.

If you choose an unregulated power supply, do not exceed 30 volts DC. This is
because unregulated supplies are rated at full load current. At lesser loads, like
when the motor is not moving, the actual voltage can be up to 1.4 times the voltage
list on the power supply label.

[modelaratrod]

The deal I had for the 3540m drives didn't pan out so I'm going with the str8, STR8 | Stepper Drives | Applied Motion
It will take 24-75 vdc and I will be running 5 of them, only 3 @ the same time 2 on x and 1 on y.
And these for steppers http://www.flashcutcnc.com/sites/def...10-24-2013.pdf
They show 3 vdc 6 amps.

Would this be a good choice for a power supply for this aplication? PS-15N70 - 1500W 70V Power Supply - AnTek Products Corp

What kind of breakout board would be needed to power 5 drives? It talks about maybe needing a regen clamp for some power supplys in the drives manual.

Thanks for all the input.

[modelaratrod]

Just to update I weighted my gantry and it's 118lbs the table is 5 x 10 8020 aluminum.

I picked up a pair of 2:1 and 3:1 gear heads and will be using this stepper http://www.automationtechnologiesinc...2100-50-8B.pdf driving it with 5 amps.

What spur gear would work well with this setup? I picked up a 24 tooth with 1.083" dia and a 30 tooth with 1.333" dia

I'm trying to cut thinner sheet metal and need 350 ipm

[modelaratrod]

Here's a few progress pics.

[modelaratrod]

Here's where I'm @ driver is 3.5 amp micro stepping set to 1/10 or 2000 steps per revolution, 2:1 gear reduction gear heads running on a 14.5 pressure angle 24 pitch R&P with a 24 tooth spur gear with a OD of 1.083"

I'm running two steppers, one on each side of the x axis.


I told the axis to move 16" and it moved 41"

16/41=0.3902439 and divide Pi by the gear ratio? 3.14/2=1.57 so 0.3902439x1.57=.612682

I need to figure out the gear ratio and screw thread for the x axis

[Phil465]

I'm having similar problem to yours above. Did you figure it out