[reuelt]

I would simply just change the Microsteps from 8 to 16 and start using the machine immediately.
26.67*2 =53.34 (within 50-99999 range)

But YOU should consider changing the pulley gear ratio instead

 

[reuelt]

My two concerns are loss of torque and how do I get both steppers to run on the Y-axis

So that's why I earlier recommended that you change the physical pulley gear ratio.
Alternatively,
since you are living in USA, you can always set your machine to run in inches instead of mm.
If you run in inches which is 25.4 times, you can always change the microsteps from 16 to 8 or 4 or 2 or 0 to increase the torque of the stepper motors.
When toque is increased, and both the Y-axis motors are moving, you will need to calibrated the 0 position of each side of the y-axis gantry.

 

[reuelt]

You need to change the pulley ratio so that you will need at least twice the number of pulses for the same linear distance.
FYI my machine needs 320 pulses /mm.
Did you fix the pulleys the wrong way? Try swapping the pulleys pairs around.

 

[reuelt]

Now that the holiday guests have left, I resumed my inquiries into the CNC Router conundrum.

I did an internet search and found a site that purports to have the latest firmware ready for download. I downloaded the file and installed it on my controller. Lo and behold - I now have parameter #115 which allows me to change units from mm to inches. By switching to inches I was able to synch the actual distance traveled to the displayed distance. This means that all my work has to be done in imperial units, not metric which I prefer.

I connected both drive motors for the Y-axis and everything is running smooth at 8 microsteps.

The design of the belt drive does not permit swapping drive pulleys. View attachment 403755 View attachment 403756

Congratulations