Stepper Motor with Double Output Shaft

Stepper motors, or rather motors in general, may be manufactured to have a shaft that extends out both ends of the unit. The greater majority of units sold though will have the shaft extending out one end only. The reason of this is simple - applicability to the needs of the end application. Ability to modify an existing motor to push the shaft out from one end to cause it to extend out both ends may be possible in some instances but it depends entirely on the construction and design of a particular motor. So there is not a specific answer to your question other than to purchase a unit you are interested in and try taking it apart and seeing what may be possible. In lieu of that you need to put on your shopping hat and start looking at manufacturer web sites and find a motor that has dual extended shaft ends that would meet your needs.

1. How can I get a stepper motor to engage with a freely spinning wheel?

You can use a SPRAG type clutch from Altramotion.com or a backstop that would spin the opposite direction which could act like a engagement gear. But i still believe you can get a all in one unit from them for a SPRAG clutch that will be useful for you.

2. Stepper Motor Voltage

Darlington pairs have very high saturation voltage. In this case if you refer to the datasheet for the TIP122 you will see that you might expect anything from 2-4V across the C-E. In your case the saturation voltage will be very high because you have minimal base current for the TIP122. A FET may be a better device to consider. Update: The base current you use is far too low. You have to overdrive the base to ensure the final transistor gets closer to saturation. Using the Fairchild datasheet for the TIP122 (there is an error in the OnSemi version) you get this graph. For Ib=Ic/250 you will need 4mA of base current (it's slightly more complicated than this because of the internal resistors). With a Vbe(sat) of around 1.5V you need an 875 Ohm base resistor driving from a 5V Arduino. This should give you a Vce(sat) of approximately 0.8V at 1A.

3. stepper motor doesn't work but get no error message

Here you can find the manual of your stepper driver.Look at page in the section "CN3 (I/O signals)". Beside the pulse and directions, that you already set in your code, there are 2 more input signals defined: AWO will turn off the motor completely, if you provide a signal, CS changes the source of the step angle setting. As you do not configure any pins, other than pulse and direction, the other pins on the Arduino are set as input/high impedance. The state of these pins can float wildly depending on what noise is comming by. I do not know, if this really matters for this driver, but you should try to provide a valid state on all the input pins of the driver. For example a floating AWO pin might randomly disable and enable your motor very fast (which would at least fit with the described behavior). Set the corresponding pin on the Arduino as output (via pinMode()) and give them the state, that you want via digitalWrite() (I suggest LOW for AWO to enable the motors and HIGH for CS to get the basic step angle).I cannot see on your images, if everything is connected to the driver, as it should (here a wiring diagram or a schematic would help). For now I assume, that the signal pins on the Arduino side are connected correctly.The input signals of the driver are meant to be provided by a pair of twisted wires. This is done to minimize noise on the line. Thus all input signals have 2 pins: "" and "-". Connect all "-" pins to ground and the "" pins to the appropriate digital output pin on the Arduino.If a have a oscilloscope or a logic analyzer, you can also monitor the ALM and TIM outputs of the driver. Maybe they are showing, what is going wrong.Let us know, if this helps

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If I understand your question correctly, it seems to me that you are looking for a DC torque motor (brushed or brushless) with a suitable sensor attached to the load or to the output shaft. The sensor measures whatever it is what you want to control, you need a processor to implement the control system algorithms, and a power amplifier to deliver electrical power to the motorI don't know how to call the device I'm looking for (or need to create), maybe you can help me with terminology too so I can at least search..I want something that either rotates or pulls with a certain (controllable) force, i.e. not like a servo/stepper motor which control position, but on the contrary, it should be able to "catch up" to the moving load fast or stay still if the load is too heavy, but provide a steady pull of a certain force. Do these things exist and if so, what are they called? Do you know of any such thing that does it out of the box?Btw I'm looking for something that pulls in the range of 100-200 lb, so the constant tension things from sewing machines won't work :)·OTHER ANSWER:I don't know how to call the device I'm looking for (or need to create), maybe you can help me with terminology too so I can at least search..I want something that either rotates or pulls with a certain (controllable) force, i.e. not like a servo/stepper motor which control position, but on the contrary, it should be able to "catch up" to the moving load fast or stay still if the load is too heavy, but provide a steady pull of a certain force. Do these things exist and if so, what are they called? Do you know of any such thing that does it out of the box?Btw I'm looking for something that pulls in the range of 100-200 lb, so the constant tension things from sewing machines won't work :)
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