Did you know that the belt tensions are one of the most important factors when it comes to tuning your CoreXY machine?
While wrong belt tensions will not make or break your machine, they help your nozzle to move more accurately.
At 150mm/s with 2500mm/sˆ2 travel accelerations on an active print, a loose belt will make your look like you have layer shifts.
With KAY3D's belt tensioning design, albeit cantilevered, it'll give you all the adjustments you need.
(Do you have an earlier/ development mk2 kit? You can download your own belt tensioner from the .STL section. Direct link here. Instructions included in all of the latest manuals)
Please follow the pictorial instructions below to have your belt tensioned.
While there are several school of thoughts on the correct belt tensions, we believe in having our machines tuned with 70-80Hz with a deviation of not more than 7Hz between belts.
The application of choice available on Android and iOS is called n-Track Tuner and images below will be made reference to this app.
You can download the iOS app here.
You can download the Android app here.
Have your KAY3D CoreXY machine placed at a quiet place. For good measure, we recommend having the following switched off/ closed.
- air conditioning
- all other noise generating devices & equipment
- your lab/ room door closed
You should also have excess belts on your machine. They should not be cut after the assembly process following the manual guidelines
Your gantry should also be relatively square. If not, please reassembly your belts using the gantry squaring techniques you can find in the manual.
Move your hotend assembly (XCP-001 on the mk2 kits) to the middle of the carriage.
Move your hotend assembly towards the rear of the bed. As much as possible is fine. Ensure that your cables, cable housing, loose wires make no contact with the belts.
Gently pluck the top belt and bottom belt one at a time. Do not pluck them together. It is important to note that are are going to aim for 70-80Hz on each belt.
Place your iOS or android device near the belt you are plucking. In this case, the top belt. Pluck it with a finger and observe the readings highlighted in red.
If the reading is well below 70-80Hz like referenced in the image below, you want to tighten your belts.
In the assembly process, you would have realised by now that since it's a CoreXY machine, tightening the top belt affects the bottom. If your belts are resonating at a non desired frequency, tighten both the belts using the belt tensioners.
The maximum allowable tensioning of the belts is 7± 1mm on each side.
Repeats steps C & D until your desired belt tension resonance is reached. We really recommend 70-80Hz for a start and the genuine gates belt included in all the KAY3D CoreXY kits should stay tensioned for a good time.
There is not fixated deviation between the resonance of the top belt and bottom belt but usually, we recommend a deviation of 7Hz.
In other words, if one belt resonates and measures at 70Hz, the other belt should measure no more than 77Hz or less than 63Hz. Granted, other mechanical issues can cause a more than allowable deviation and still produce great prints.
If your belts are still too loose after tightening your tensioners all the way, your initial belt alignment/ tensioning process may have been less than ideal.
We suggest re-working the belts, starting with BAJ-001 again
Still unsure? Reach out to support with your order ID and we'll love to help you out.