Newly constructed coil winder base.

I built a new base for the PIC18F4550 based coil winder that has enough room to accommodate two new LiniStepper driver boards, and two computer power supplies.

The new winder base is made of all 1/2" birch plywood with rabbit joints cut into all the plywood edges. Using rabbit joins, wood glue, and 1/2" plywood makes the base very strong without the need for internal bracing.

The outside dimensions of the new base are 12 inches deep, 24 inches wide, and 6 1/2" high.


Inside view of coil winder base.

Inside the box I have two computer power supplies. I modified one of the power supples so the outputs are not tied to ground (floating), so I could use the 12 volt outputs from both power supplies in series for a 24 volt power source for the stepper motors.

I also have two circuit boards with power resistors to maintain a minimal current load on each of the power supplies so the supplies function properly. There is another small circuit board with a 4N32 optocoupler ic that is used to power on the secondary power supply when the primary power supply is powered on by its external power switch.


Rear view of coil winder showing power supplies and y splitter computer power cord with switch box.

I was thinking about buying a y splitter computer power cord for convenience, but decided I would also like to be able to switch the ac line power off on both power supplies so I made a y splitter power cord with a power switch from two standard computer power cords, a small electronics project box, a hefty toggle switch, and a few miscellaneous parts.


Closeup image of coil winder carriage with dual guide rails. 

Another change to the coil winder is the addition of a second guide rail for the winder carriage platform. This has made a very significant improvement in the removal of vertical movement from the carriage.

I also added some hardware to remove the end to end backlash from the threaded carriage rod. It removes the backlash without relying on the motor and coupling to control end to end play and is adjusted so there is no end to end force pushing or pulling on the motor coupling.


Closeup image of carriage threaded rod antibacklash hardware inner-side. Closeup image of carriage threaded rod antibacklash hardware outer-side.

Closeup of the added hardware to remove the backlash from the carriage threaded rod. I will be adding a breakdown of the parts I used.



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