Gantry Sides
For this part of the build we will be using:
2 x Gantry Sides (part of plate set) 14 x M5 Nyloc Nuts
14 x Low Profile Screws M5x45mm
22 x Spring Washers
36 x Standard Washers
12 x Eccentric Spacers (6mm)
16 x Aluminum Spacers (6mm)
14 x Precision Shim (10x5x1mm)
14 x Solid-V Wheels kits
2 x Nema 23 Motors
2 x Motor Standoffs or 8 x Aluminum Spacers (3mm)
8 x Low Profile Screws M5x25mm
8 x Small Washers
8 x Hex Nuts (M5)
2 x GT3 Aluminum Timing Pulley (20 tooth)
These are the parts for the gantry side, with optional longer inner bolts for adding a inner wheel support at a later date.
Place a spring washer on each of the wheel bolts,
followed by a standard washer.
Install seven M5x45mm low profile screws onto the gantry side plate. Please note we are using the M5x45mm low profile screws as we would like to install a second support bracket at a later stage, which we plan to cut using the Ox itself.
Install three 6mm eccentrics onto the lower bolts and four 6mm aluminium spacers to the upper bolts.
Install a precision shim onto each wheel bolt.
Install a solid V wheel onto each bolt.
In the standard Ox build you would then drop on the wheels and M5 nyloc nuts. We will however be adding another 6mm aluminium spacer to the top four bolts, and 6mm eccentric spacer to the bottom three bolts, in preparation for the upgrade plate to be added later.
Inner Gantry Plate:
We recommend cutting and installing an inner gantry plate (the 45mm low profile screws required for this upgrade come standard with our kits). The inner gantry plate is not only good for added support, but is also a great way to assist keeping dust and debris away from the wheels and belt. It also provides improvement to the linear guide system as it supports each load bearing wheel from both sides.
Install a 6mm aluminum spacer onto each bolt. The lower three spacers will be replaced with eccentrics at a later date. Once the spacers are installed, the inner wheel support brace would be placed onto the assembly.
Install a standard washer onto each bolt.
Install one M5 nyloc nut onto each bolt and lightly tighten so any final adjustments can still be made before fully locking off.
Install one standard washer onto each of the M5x25mm low profile screws (stepper bolts).
Drop the bolts and washer into the stepper mounting slots.
Install a length of 20mm x 80mm V-Slot linear rail and adjust the top wheels to be all inline.
Tip: using a second length of V-Slot linear rail to sit along the top side of the top row of wheels helps keep the wheels even while locking off.
Once the top row of wheels are in line, tighten then lightly adjust the bottom wheels to have even tension on the V-Slot. Now when you move the V-Slot linear rail, all the wheels should rotate at the same speed.
Check that the clearance between the head of the stepper bolt and washer stack is clear of the V-Slot. If there is contact or they are too close for comfort, you can either remove the lower washers from the stepper mounting bolts to gain a millimeter more clearance or you can add a second precision shim between the first and each wheel to gain a millimeter.
Here, you can use either the motor standoffs, or 3mm aluminium spacers. Drop the spacer and stepper motor onto the mounting bolts.
Add a small washer to each bolt,
followed by a spring washer to each bolt.
Add a hex nut to each bolt and lightly tighten so that adjustment is still possible. The best placement at this point is with the motor as low as possible while still being able to get an hex key to the lower bolts when it is mounted on the V-Slot linear rail.
Fit the GT3 pulley to the stepper shaft and light tighten, as it will need adjusting once the timing belt is installed.
Repeat on the other gantry side.
