Linistepper FAQ
The project involves using a 6-wire linear actuator to slowly push a syringe pump. The motor utilized is a custom Hurst SLS model acquired from a surplus dealer in Silicon Valley, rated at 12VDC and 11.5W, which translates to approximately 0.96A with a resistance of 12.5 Ohms. The inquiry focuses on the power supply requirements and connections, with a mention of having a background in business rather than electrical engineering. The user intends to operate a 2.7A motor, noting that the sense resistor must not be lower than 0.66 ohms. There is a need to adjust resistors R14-R17 and R18-R29, but previous attempts to find suitable values have been unsuccessful. Assistance is requested in determining starting values for these resistors. Additionally, there are questions regarding the compatibility of the stepper driver with a US Cyberlab Neuractor CNC-4+ kit and whether multiple motors can be controlled from one printer port. The user has also purchased three Nema 34 motors rated at 1.7A for approximately $50, seeking confirmation on the price and suitability for the Linistepper. There is a discussion about the Linistepper's reliance on a 16MHz resonator, as well as concerns about back EMF protection for the motor coil when the drive is turned off. Lastly, there is a request for a schematic for a 555 circuit that works with the board, along with a note that the circuit diagram on the Linistepper page has been revised.
The circuit involves a 6-wire linear actuator designed to interface with a syringe pump, utilizing a custom Hurst SLS motor rated for 12VDC and 11.5W, which indicates a current draw of approximately 0.96A. The power supply requirements will need to accommodate the motor's specifications, ensuring that the supply can deliver the necessary voltage and current without exceeding the motor's ratings. The user intends to operate a 2.7A motor, which necessitates careful selection of the sense resistor to ensure proper current sensing and control. The minimum resistance value for the sense resistor is established at 0.66 ohms, and adjustments to resistors R14-R17 and R18-R29 are critical for achieving the desired motor performance.
In terms of the circuit design, it is essential to ensure that the resistors are selected based on the target motor current and the characteristics of the driver circuit. Using a resistor calculator or reference guide can help determine appropriate values for these resistors. The Linistepper design may also require modifications to accommodate the specific motor characteristics, especially if the motor's specifications differ significantly from those for which the driver was originally designed.
Regarding the compatibility of the stepper driver with the US Cyberlab Neuractor CNC-4+ kit, it is important to verify the specifications of both the driver and the kit to ensure that they can work together effectively. The question of controlling multiple motors from a single printer port is also relevant; typically, each motor would require its own driver and control signal to function correctly, which may limit the ability to control multiple motors simultaneously from a single port.
The inquiry about the Nema 34 motors indicates a proactive approach to sourcing components for the project. The price of $50 for three motors can be considered reasonable, but the suitability of these motors for the Linistepper should be evaluated based on their specifications, including voltage, current rating, and stepper type.
Finally, the concern regarding back EMF protection is valid; implementing a reverse diode or a zener diode across the motor terminals can help mitigate the risk of voltage spikes that could damage the driver circuit. This addition would enhance the reliability of the circuit by ensuring that any back EMF generated during motor operation does not exceed the voltage ratings of the components used.Using it to (hopefully) drive a 6-wire linear actuator, which will slowly push a syringe pump. The motor is a Hurst SLS custom-jobbie I got from a surplus dealer here in Silicon Valley; the label says 12VDC, 11 1/2W (which, in my newbie brain, means about. 96A; 12. 5 Ohms. ) So - what are my power supply requirements/hookup (Sorry, but I wasted my education on an MBA, and am mostly trying to learn chemistry lately - my EE knowledge is decades old. ) TIA! I would aappreciate a little help. I intend to use a 2. 7A motor, but is aware that tnhe the sense resistor cannot be lower than 0. 66 ohm. I understand that R14-R17 has to be changed, and so do R18-29. Have tried various values, but it`s it been really a shot in the dark. Could you be able to suggest some values are starting point. James Newton replies: You can use the form about half way down the page at to find the sense resistor values to use for your target motor current. I`m a little confused as to why you feel the other resistors must be changed. + I am using a US Cyberlab Neuractor CNC-4+ kit that I built 10 years ago. My software is DANCAM. My motors/drivers are pretty whimpy. Do you know if your stepper driver has been used to retrofit a CNC4+ kit to provide better torque and speed Thanks, Durl They say that there is no such thing as a stupid question, I say "Are they nuts" Please clarify, can one linistep control multiple motors from one printer port Futhermore, I just "ebayed" three (Hy200 Nema 34 170A8 1.
7 amps) motors. I paid nearly $50. 00 USA, is that a good price, and is that motor suitable for the linistep Thank you very much for your help. James Newton replies: One lini per motor. I don`t know, I pull my steppers from old copiers, printers, and fax machines. If it has 5 or more wires, it will probably work fine. + Hi to all! I`m very new to Pics, but have had excellent results so far with "burning" the 16f types, using source codes or hex files compiled by the experts "as is".
The Linistepper looks fantastic to me, but I need some advise here. The project calls for a 16Mhz resonator. The Pic on the pictures seems to be a 10Mhz type. James Newton replies: 1. The kit is supplied with the correct part for the resonator. 2. A slower osc can be used, but the unit will have a lower maximum step rate. 3. I would expect the source modifications would be minimal. + I have a question about the Linistepper. There appears to be no protection for the back emf generated by the motor coil when the drive is turned off. It appears to me that the voltage on the transistor collector will rise to a fairly high value and be in danger of destroying the transistor.
Obviously this does not happen, perhaps the caps on the base drive limit the dI/dt sufficiently I am curious if you have ever looked at the voltage waveform on the transistor collectors. If nothing else, the current would take longer to decay on turn off than if it were shunted with a reverse diode, or even better, a zener, that clamps the back emf to say 50V, before it can pop the transistor.
This current would tend to reduce torque as it is opposing the rotor moving to the next position. Jerry Foster asks: "Do you have a schematic for a 555 ckt that you know works with your board Thanks. " Yes, here it is, and we are working on a PCB / Kit for this circuit which should be available soon.
Update: The 4Axis kit has a 555 option. SPAMgustavo_afonsoSTOPspam at ~NOSPAM~ig. com. br asks: " Is the circuit diagram at the linistep page revised Can I make that circuit without worry Regards from Brazil" James Newton replies: The sense resistors are usually customized for your motors and application. There was also a minor update that is detailed in the " how to build it. " + Also the instructions show 2 what the text refer to as 470 Ohm resistors but on my screen look like 47 Ohm (yellow, violet, black) and are
🔗 External reference
The circuit involves a 6-wire linear actuator designed to interface with a syringe pump, utilizing a custom Hurst SLS motor rated for 12VDC and 11.5W, which indicates a current draw of approximately 0.96A. The power supply requirements will need to accommodate the motor's specifications, ensuring that the supply can deliver the necessary voltage and current without exceeding the motor's ratings. The user intends to operate a 2.7A motor, which necessitates careful selection of the sense resistor to ensure proper current sensing and control. The minimum resistance value for the sense resistor is established at 0.66 ohms, and adjustments to resistors R14-R17 and R18-R29 are critical for achieving the desired motor performance.
In terms of the circuit design, it is essential to ensure that the resistors are selected based on the target motor current and the characteristics of the driver circuit. Using a resistor calculator or reference guide can help determine appropriate values for these resistors. The Linistepper design may also require modifications to accommodate the specific motor characteristics, especially if the motor's specifications differ significantly from those for which the driver was originally designed.
Regarding the compatibility of the stepper driver with the US Cyberlab Neuractor CNC-4+ kit, it is important to verify the specifications of both the driver and the kit to ensure that they can work together effectively. The question of controlling multiple motors from a single printer port is also relevant; typically, each motor would require its own driver and control signal to function correctly, which may limit the ability to control multiple motors simultaneously from a single port.
The inquiry about the Nema 34 motors indicates a proactive approach to sourcing components for the project. The price of $50 for three motors can be considered reasonable, but the suitability of these motors for the Linistepper should be evaluated based on their specifications, including voltage, current rating, and stepper type.
Finally, the concern regarding back EMF protection is valid; implementing a reverse diode or a zener diode across the motor terminals can help mitigate the risk of voltage spikes that could damage the driver circuit. This addition would enhance the reliability of the circuit by ensuring that any back EMF generated during motor operation does not exceed the voltage ratings of the components used.Using it to (hopefully) drive a 6-wire linear actuator, which will slowly push a syringe pump. The motor is a Hurst SLS custom-jobbie I got from a surplus dealer here in Silicon Valley; the label says 12VDC, 11 1/2W (which, in my newbie brain, means about. 96A; 12. 5 Ohms. ) So - what are my power supply requirements/hookup (Sorry, but I wasted my education on an MBA, and am mostly trying to learn chemistry lately - my EE knowledge is decades old. ) TIA! I would aappreciate a little help. I intend to use a 2. 7A motor, but is aware that tnhe the sense resistor cannot be lower than 0. 66 ohm. I understand that R14-R17 has to be changed, and so do R18-29. Have tried various values, but it`s it been really a shot in the dark. Could you be able to suggest some values are starting point. James Newton replies: You can use the form about half way down the page at to find the sense resistor values to use for your target motor current. I`m a little confused as to why you feel the other resistors must be changed. + I am using a US Cyberlab Neuractor CNC-4+ kit that I built 10 years ago. My software is DANCAM. My motors/drivers are pretty whimpy. Do you know if your stepper driver has been used to retrofit a CNC4+ kit to provide better torque and speed Thanks, Durl They say that there is no such thing as a stupid question, I say "Are they nuts" Please clarify, can one linistep control multiple motors from one printer port Futhermore, I just "ebayed" three (Hy200 Nema 34 170A8 1.
7 amps) motors. I paid nearly $50. 00 USA, is that a good price, and is that motor suitable for the linistep Thank you very much for your help. James Newton replies: One lini per motor. I don`t know, I pull my steppers from old copiers, printers, and fax machines. If it has 5 or more wires, it will probably work fine. + Hi to all! I`m very new to Pics, but have had excellent results so far with "burning" the 16f types, using source codes or hex files compiled by the experts "as is".
The Linistepper looks fantastic to me, but I need some advise here. The project calls for a 16Mhz resonator. The Pic on the pictures seems to be a 10Mhz type. James Newton replies: 1. The kit is supplied with the correct part for the resonator. 2. A slower osc can be used, but the unit will have a lower maximum step rate. 3. I would expect the source modifications would be minimal. + I have a question about the Linistepper. There appears to be no protection for the back emf generated by the motor coil when the drive is turned off. It appears to me that the voltage on the transistor collector will rise to a fairly high value and be in danger of destroying the transistor.
Obviously this does not happen, perhaps the caps on the base drive limit the dI/dt sufficiently I am curious if you have ever looked at the voltage waveform on the transistor collectors. If nothing else, the current would take longer to decay on turn off than if it were shunted with a reverse diode, or even better, a zener, that clamps the back emf to say 50V, before it can pop the transistor.
This current would tend to reduce torque as it is opposing the rotor moving to the next position. Jerry Foster asks: "Do you have a schematic for a 555 ckt that you know works with your board Thanks. " Yes, here it is, and we are working on a PCB / Kit for this circuit which should be available soon.
Update: The 4Axis kit has a 555 option. SPAMgustavo_afonsoSTOPspam at ~NOSPAM~ig. com. br asks: " Is the circuit diagram at the linistep page revised Can I make that circuit without worry Regards from Brazil" James Newton replies: The sense resistors are usually customized for your motors and application. There was also a minor update that is detailed in the " how to build it. " + Also the instructions show 2 what the text refer to as 470 Ohm resistors but on my screen look like 47 Ohm (yellow, violet, black) and are
🔗 External reference