|3dpBurner2 A3 standard single Y motor|
|3dpBurner2 A3 dual Y motor|
|Dual Y motor|
There are two ways for driving a second motor:
-The first one is as most reprap do, using a single driver and parallel connection for diving both motors. This is the most economical and could be ok for cooled electronics (more driver heat), but 3dpBurner usually don't use a fan for cooling electronics.
-The second one is the best and only adds an extra driver, using a driver for each Y motor and providing a better solution and there is no need to add any active cooling for electronics.
The second one is the goal of this page.
What extras do you need:
-1 DualYmotor 3D printed parts kit. Can be downloaded here
-1 Stepper motor.
-1 belt similar to existing Y one.
-1 GT2 20 tooth pulley
-1 Pololu based driver with heatsink.
-5 Pin jumpers (usually included on the CNC shield).
-2 623ZZ bearings.
-7 M3x20 bolts.
-3 M3x10 bolts.
-9 M3 washers.
-5 M3 nuts.
-4 M8 nuts.
-4 M8 washers.
You can see pictures for parts position reference.
-Preasemble the second Y motor kit in similar way the first one.
-Remove the bridge and disassemble the right parts for inserting the new belt holder. Reassemble the bridge with the two holders and take it apart.
-Disassemble the existing Y tensioner and motor.
-Make the new holes according to pictures/measures and mount the two tensioners and motors.
-Reassemble the bridge to main base, add the two belts and align the two transmissions.
-Reallocate all electronics for prevent bridge movements cant touch it.
|4th axis as clone of Y|
-Configure micro-step jumpers in similar way than Y axis and insert the new driver.
|Detailed cloning jumpers (protoneer)|
-Reassemble the working table and enjoy!
|BaseTable hole pattern with single Y motor|
|BaseTable hole pattern with dual Y motor|
I've tested this mod on my 300x420mm (A3) working area 3dpBurner2. By engraving a picture before and after the second motor adds.
I set my acceleration at high value for producing vibration patters on engraved image.
The next pictures has been engraved at speed of 3000mm/min using an acceleration of 2000mm/min^2 instead the 1000 reccomended for this size machine. They are 35x30mm and take about 5min to engrave each.
As you can see, i take a picture of each one in macro mode for getting detailed results.
|Single Y motor|
|Dual Y motor|
On this test i can observe a little more definition and precision on the dual Y motor one, the vibration pattern (square concentric marks) has been shrunk and there is a less area affected by them.
Due to better precision the marks are less blurred and can be "more appreciated".
I think this could be a good mod for >A3 size machines. For smaller areas there is no much difference on results so is not worth it for most users.