Here is what I used (Onefinity support helped/verified it)
I skipped the hood/cover.
I used the stepper that came with the rotary with an external driver. My estop is not wired correctly.
Looking at that next.
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Which Rotary did you get? Is the stepper that came with it 4 Amp or ?
Thanks, Pat
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Here is the amazon description:
CNCTOPBAOS CNC Rotary Axis 4th Axis with 3 Jaw Chuck,K11-100mm Hollow Shaft Dividing Head Rotational A Axis,with 65mm Tailstock,Reducing Ratio:6:1 for CNC Router Lathe Engraving Milling Machine
From the description (accurate ??)
Stepper Motor
- Nema23 stepper motor
- Size: 57x57x76mm
- Shaft Diameter: 8 mm
- Shaft length: 25.5mm
- Step Angle:1.8
- Current: 3A
- Voltage: 4.2V
- Temperature Rise: 80 c max
- Insulation Resistance: 100MOhm(500V DC)
- Holding Torque: 18kg.cm
Thanks, I got the same on but the 80MM, on the 80 MM unit the hole thru the chuck is way smaller than the thru hole in the spindle it is mounted on .
Thanks Again
Pat
My main question is travel min and max, the MAsso docs say to input very large numbers here so you can spin the axis and sand or polish the part, I have seen the numbers above in use (only min and max travel) and the axis is as the numbers indicate turn one direction one full turn then repeat in reverse over and over again.
I think I m going to try very large number to start with like 360,000 or something like that
Thanks, Pat
I don’t like to link to am*zon.com but it is this one https://www.amazon.com/dp/B07B2RTBGZ (link intentionally broken, copy and paste to your URL bar if you like)
I agree with your larger values for the travel. I"m not sure if your Max Feedrate is right though. 42000/360 is 116.667 revolutions per minute. That’s almost two rotations per minute. With two inch diameter stock that’s equivalent to a feedrate of 366 inches per minute, if I did that right. That’s over twice as fast as I run my 1/4" bits.
I’m no expert though. I’m just prepping like you are.
I just found this link, which shows a Masso support tech using +/- 1,000,000
Great thread! Thank you. This says output current of 4.5A, which can’t be what it draws on input current. It’s on a 2A fuse and it’s a smaller, weaker motor than the 2Nm and 3Nm, which require less draw. My guess is that it’s a 2A draw, but I don’t have a a good way to prove it.
I think my concern is minimize by the fact that this is the Maximum feed rate. I’ve seen other configs in the forums that are set similarly, but I don’t think you’re likely to push it that fast.
Hey Adam,
please correct me if I’m wrong, but I think the stepper motor of a rotary axis is much less demanded than those of the XYZ axes. Mostly it does not even rotate (in the examples linked here), which means it is all current just for the holding torque. The question is whether you request the rated power at all. As long you don’t plan to use it as a lathe.
Don’t you have an ammeter? There are also inductive consisting of a pair of pliers and do not require electrical contact.
I’m not sure if you’re right or wrong. I do have a multimeter. I could measure the draw, but not inductively.
I’m not sure what force is greater. I suppose if you milled large stock on the rotary it may put more demand on it, but I have t done the math.
Hey Adam,
I don’t own or run a Masso CNC controller and don’t plan to get one, or an Onefinity Elite, but I followed Tom’s @TMToronto Masso G3 (non-Elite) project described in this forum and compare it with the CNC controllers I know.
Please correct me if I’m wrong but the stepper of the rotary axis above is a bipolar stepper without any driver. Is your rotary this way too? This means it has four wires that you have to connect to a stepper driver the way described here.
By the way, this is the way the open-loop steppers of the buildbotics-derived Onefinity Original Series are conntected. The stepper drivers are inside the CNC controller there.
But the Onefinity/Elite Masso stepper motors are motors with integrated driver. This means, the Masso G3 CNC controller just delivers the STEP and DIRECTION signals, and it’s up to you to provide a stepper driver that transforms this into the currents sent to the bipolar stepper motor. At least this is what it looks like when explained here.
So I purchased a decent DC clamp on ammeter and checked the amp draw on one of the Y axis steppers just now while machining a typical piece for me.
When the stepper is still and not moving there is zero amp draw, when machining it went up to .05 amps, the scale on my meter was for 6 Amps. I have the red wire (power) where it connects to the stepper in the clamp.
Anybody see what I am doing wrong or is it very improbable that we would never draw 2 full amps in these conditions.
Pat
I suspect you are correct, and I’m sure they won’t use 2A for long under normal conditions, or the fuses would blow.
I have the same rotary axis the 1F is looking at but changed the motor out for one with integrated driver, wired it up exactly the same as the other steppers on mu machine and it all works as it should except when I hit E Stop it stays energized unlike the other motors. I think you are working on the same thing, any ideas?
Thanks, Pat
How did you wire. up the enable pin on the motor to the controller?
I connected it to a white terminal strip hanging loose in the Masso enclosure, see pic
But I just noticed that the alarm connections existing in the enclosure all have 2 wires at each input I have only one connected to input 23 and assigned to A axis motor alarm, I can’t yet see where the two wires come from, they are purple and the motor has only one purple wire, more to investigate I guess.
Thanks, Pat
There should be a 2.2k Ohm resistor between that terminal block with the green wires and the enable pin on your motor, if you want to wire it like the other motors.
I’ll don’t recall how the alarm is wired on the 1F motors, but I will be wiring mine up today. I will let you know if I learn anything useful.