02. X-Axis Gantry Assembly

2x 1216mm 4080 Extrusion (1716mm for the StrongHold PRO 1500x1500)

1x 1216mm 40120 Extrusion (1716mm for the StrongHold PRO 1500x1500)

14x M12 Washer

14x M12x45 Cap Head Screw

1x Rat Rig StrongHold PRO CNC - XY Joiner Plate Left

1x Rat Rig StrongHold PRO CNC - XY Joiner Plate Right

4x sh_pro_hg25r_end_spacer Printed Part

4x 4040 Extruded Corner Assembly (For the gantry)

1216mm 4080 Extrusion

1716mm for the StrongHold PRO 1500x1500

1216mm 40120 Extrusion

1716mm for the StrongHold PRO 1500x1500

Position the three extrusions as shown to form a "C" shape as shown

4040 Extruded Corner Assembly

Slide each 4040 corner assembly in to the inner channel as shown

Position the 4040 corner assemblies based upon the following measurements:

1000x1000 or 1000x1500:

380mm

1500x1500:

550mm

Do not tighten the corner assemblies at this point, this will be done after squaring the assembly

sh_pro_hg25r_end_spacer Printed Part

Insert two sh_pro_hg25r_end_spacer printed parts in to the 4080 extrusions as shown

Rat Rig StrongHold PRO CNC - XY Joiner Plate Left

Verify you are installing the correct plate on the left side. The left plate has additional holes not found on the right one.

Align the XY Joiner plate with the end of the gantry assembly

M12x45 Cap Head Screw

M12 Washer

Place an M12 washer on to each M12x45 cap head screw and loosely screw them through the plate and in to the extrusion

Do not fully tighten any of the M12 screws at this point

sh_pro_hg25r_end_spacer Printed Part

Insert two sh_pro_hg25r_end_spacer printed parts in to the 4080 extrusions as shown

Rat Rig StrongHold PRO CNC - XY Joiner Plate Right

Align the XY Joiner plate with the end of the gantry assembly

M12x45 Cap Head Screw

M12 Washer

Place an M12 washer on to each M12x45 cap head screw and loosely screw them through the plate and in to the extrusion

Do not fully tighten any of the M12 screws at this point

Before continuing with the assembly, the gantry must be squared and all screws full tightened

Ensure the three extrusions are pressed together with no gaps. If clamps are available, the extrusions can be optionally clamped together for the remainder of this step. If using clamps, make sure they are positioned as low as possible. Do not deform the "C" shape of the extrusions!

Tighten the four marked M8x16 screws in the extruded brackets to secure them to the rear 40120 extrusion. Check that the measurements mentioned in Step 3 are maintained

Verify there are no gaps between the extrusions, and that the extrusion ends are aligned

Fully tighten the remaining four M8x16 screws in the extruded brackets

Using an engineers square, or a flat edge, check that the side plates are flush with the extrusions at the top of the gantry

Fully tighten all fourteen M12x45 screws on both ends of the gantry to secure everything together

Verify that all parts of the X-axis gantry assembly are still correctly aligned and adjust as necessary

2x 1190mm HG25 Linear Rail with 2x Carriages

2x 1690mm for a 1500x1500 machine

40x M6x25 Cap Head Screw

56x for a 1500x1500 machine

40x 4040 Drop-in T-Nut - M6

56x for a 1500x1500 machine

2x align_4080_hg25 Printed Part

The linear rails are supplied with a protective oil coating on them. It is strongly recommended to prepare your work surface with paper towels and to wear disposable gloves.

Paper Towels

Linear Rail

Carefully open one end of the linear rail packaging and remove the rail. Place the rail upon the paper towels and dispose of the packaging

The oil on the rails protects them from rusting. Make sure not to remove all of the original oil during preparation.

The linear rail carriages are not interchangeable. Do not try to use a carriage on a different linear rail than the one it was supplied with.

With the rail still on the absorbent paper towels, carefully and slowly move the carriage from one end of the rail to the other

Both carriages should move smoothly over the entire length of the rail

Small changes in resistance are normal, but the carriage becoming very hard to push, or binding completely are not

Repeat the previous test whilst applying a small amount of force downwards on the carriage

The carriage will likely travel more smoothly when applying a downwards force, this is normal

Repeat the process to check the second carriage on the rail

If the carriage does not move smoothly, or binds completely, refer to the Linear Rail Troubleshooting Guide

Do not allow the linear rail carriages to leave the end of the rail at any point

HG25 Linear Rail

Insert an M6x25 cap head screw in each of the holes on the linear rail

Loosely thread a 4040 T-Nut on to each of the M6x25 screws

Repeat these instructions for the second linear rail

StrongHold PRO X-Axis Gantry Assembly from Step 8

HG25 Linear Rail Assembly from Step 12

Insert the linear rail into the slot of the 4080 extrusion, between the 3D printed spacers

Install the two HG25 4080 alignment tools as shown, this will make sure the linear rail is positioned correctly

Tighten every other M6x25 screw, starting from one end

Tighten the remaining M6x25 screws, starting from the same end as before

Remove the HG25 40120 alignment tools

Repeat the instructions in the previous step to install the second HG25 linear rail to the X-axis gantry assembly

1x 1280mm 1610 Ball Screw (1780mm for a 1500x1500 machine)

1x FK12 Ball Screw Mount & Ball Screw lock nut (Packaged with the FK12 mount)

1x FF12 Ball Screw Mount & Circlip (Packaged with the FF12 mount)

1x 16mm Ball Screw Block

6x M5x20 Cap Head Screw

4x M4x20 Cap Head Screw

4x M4x25 Cap Head Screw

8x M4 Nylon Locking Hex Nut

1280mm 1610 Ball Screw (1780mm for a 1500x1500 machine)

Unpack and remove all protective packaging from the ball screw

Ball screw nut

Do not allow the ball screw nut to reach the end of the ball screw

16mm Ball Screw Block

Install the ball screw block onto the ball screw nut as shown

6x M5x20 Cap Head Screw

Install an M5x20 screw through each hole in the ball screw nut and into the ball screw block. Fully tighten each screw

X-Axis Gantry Assembly - Left Side

FK12 Ball Screw Mount

Insert the FK12 ball screw mount in to the left plate as shown

M4x25 Cap Head Screw

Insert an M4x25 screw through each of the four holes in the FK12 mount and through the left plate

M4 Nylon Locking Hex Nut

Install an M4 locking hex nut onto each M4x25 screw and tighten fully

Position the ball screw assembly (from Step 16) so that:

The end with the thread faces towards the FK12 mount

The side of the ball screw block with the screw holes faces away from the X-axis gantry assembly

Carefully feed the non-threaded end of the ball screw through the open hole in the right plate on the gantry

Align the threaded end of the ball screw with the hole in the FK12 mount

Whilst supporting the full length of the ball screw, insert the threaded end through the hole in the FK12 mount

The ball screw is a precision fit into the FK12 mount. Do not force the ball screw in to the mount. When correctly aligned, it should slide in with little effort

Install the FF12 ball screw mount onto the free end of the ball screw and into the opening on the right plate

FF12 Ball Screw Mount

M4x20 Cap Head Screw

Insert an M4x20 screw through each of the four holes in the FF12 mount and through the idler plate

M4 Nylon Locking Hex Nut

Install an M4 locking hex nut onto each M4x20 screw and tighten fully

FK12 Ball Screw Mount

Ball Screw Lock Nut

Fasten the ball screw lock nut on to the exposed end of the ball screw as shown

When the ball screw lock nut is fully tightened, use a 2mm hex key to tighten the grub screw within the lock nut. This will prevent the lock nut from loosening

1x Rat Rig StrongHold PRO CNC - XZ Joiner Plate

4x M6x16 Cap Head Screw

4x 4040 Drop-in T-Nut - M6

16x M6x12 Cap Head Screw

4x M5x16 Cap Head Screw

2x 80mm 4040 Extrusion

X-Axis Gantry Assembly

Rat Rig StrongHold PRO CNC - XZ Joiner Plate

Position the HG25 linear rail blocks so that the holes align with those on the XZ joiner plate

M6x12 Cap Head Screw

Install an M6x12 screw through each hole in the plate, and in to the HG25 linear rail carriage below

Before fully tightening the M6x12 screws, check that the X-axis moves over its entire length without binding

Tighten each screw slightly and then re-test the smoothness of the X-axis. Repeat this until all sixteen screws are fully tightened, securing the plate

If the X-axis binds or becomes tight, check that the lower rail is aligned correctly. Loosening the screws securing the lower rail to the 4080 extrusion and using the X-axis to align the lower rail can help.

Align the X-axis so that the screw holes in the ball screw block are visible through the marked holes in the plate

M5x16 Cap Head Screw

Install each of the four M5x16 screws though the plate and secure them in to the ball screw block

It is important to verify that the X-axis ball screw is fully aligned before continuing

Move the X-axis all the way to the left side by rotating the ball screw

If the X-axis becomes tight and difficult to move as it approaches the left end, do the following:

Loosen all four of the M4x25 screws securing the FK12 mount in place

Move the X-axis fully to the end

Re-tighten all four of the M4x25 screws on the FK12 mount

Move the X-axis all the way to the right side by rotating the ball screw

If the X-axis becomes tight and difficult to move as it approaches the right end, repeat the above instructions to adjust the FF12 mount

M6x16 Cap Head Screw

4040 Drop-in T-Nut - M6

Loosely thread the 4040 T-Nuts on to the M6x16 screws. Do not tighten them at this point.

80mm 4040 Extrusion

Position each 4040 extrusion as shown, ensuring that the tapped end of the extrusion faces away from the gantry

Check that the end of each extrusion is flush with the XZ joiner plate

Tighten each of the M6x16 screws to secure the extrusions to the XZ joiner plate

2x 280mm HG15 Linear Rail with 2x Carriages

10x M4x20 Cap Head Screw

Unpack and test the HG15 linear rails as previously instructed in Steps 9 & 10

The linear rail carriages are not interchangeable. Do not try to use a carriage on a different linear rail than the one it was supplied with.

HG15 Linear Rail

Align the holes in the linear rail with the screw holes on the XZ joiner plate

M4x20 Cap Head Screw

Insert a screw into each hole on the linear rail and fully tighten them in to the XZ joiner plate

1x 300mm 1204 Ball Screw

1x Rat Rig StrongHold PRO CNC - Z Top Plate

10x M4x18 Cap Head Screw

1x FK10 Ball Screw Mount & Ball Screw lock nut (Packaged with the FK10 mount)

1x 12mm Ball Screw Block

2x M12x45 Cap Head Screw

4x M5x16 Button Head Screw

2x 90 Degree Corner Connector

Rat Rig StrongHold PRO CNC - Z Top Plate

FK10 Ball Screw Mount

Position the FK10 mount in to the Z top plate as shown, aligning the holes with the threaded holes in the plate

M4x18 Cap Head Screw

Insert and tighten all four M4x18 screws through the FK10 mount and in to the plate

Do not over tighten the M4x18 screws as doing so can damage the screw threads in the aluminium

90 Degree Corner Connector

Position each 90 degree corner connector with the marked hole, in the orientation shown

M5x16 Button Head Screw

Secure each 90 degree corner connector with an M5x16 screw

Do not over tighten the M5x16 screws as doing so can damage the screw threads in the aluminium

300mm 1204 Ball Screw

12mm Ball Screw Block

Install the ball screw block onto the ball screw nut as shown

6x M4x18 Cap Head Screw

Install an M4x18 screw through each hole in the ball screw nut and into the ball screw block. Fully tighten each screw

300mm 1204 Ball Screw Assembly

FK10 Ball Screw Mount

Insert the threaded end of the ball screw through the hole in the FK10 mount

The ball screw is a precision fit into the FK10 mount. Do not force the ball screw in to the mount. When correctly aligned, it should slide in with little effort

Ball Screw Lock Nut

Fasten the ball screw lock nut on to the exposed end of the ball screw as shown

When the ball screw lock nut is fully tightened, use a 2mm hex key to tighten the grub screw within the lock nut. This will prevent the lock nut from loosening

From this point forward, make sure that the ball screw nut remains near the middle of the ball screw. Allowing the ball screw nut to reach the end of the ball screw will cause permanent damage to the ball screw

8mm Clamping Lock Collar

Install the lock collar on to the end of the ball screw as shown

M3x12 Cap Head Screw

Fully tighten the M3 screw in the lock collar to secure it to the ball screw

StrongHold PRO X-Axis Gantry Assembly from Step 27

StrongHold PRO Z-axis Transmission Assembly from Step 33

Position the Z-axis transmission assembly as shown, aligning the 90 degree corner connectors with the indicated holes

M5x16 Button Head Screw

Fasten each 90 degree corner connector to the XZ joiner plate with an M5x16 screw

Do not over tighten the M5x16 screws as doing so can damage the screw threads in the aluminium

M12x45 Cap Head Screw

Insert one M12x45 screw through each hole in the Z top plate and secure in to the 4040 extrusion

Fully tighten both M12x45 screws

Check all four previously installed M5x16 button head screws are fully tightened as well

1x Rat Rig StrongHold PRO CNC - Z-Axis Plate

16x M4x16 Cap Head Screw

4x Rat Rig StrongHold PRO CNC - HG15 Spacer

4x M5x14 Cap Head Screw

Rat Rig StrongHold PRO CNC - HG15 Spacer

Place one spacer on top of each HG15 linear rail carriage

Rat Rig StrongHold PRO CNC - Z-Axis Plate

Place the Z-axis plate on top of the spacers and adjust the carriage positions so that all 16 holes are aligned

M4x16 Cap Head Screw

Insert each M4x16 screw through the Z-axis plate, the HG15 spacer, and thread them in to the linear rail carriage

Fully tighten all the M4x16 screws

Before proceeding, check that the Z-axis moves smoothly

Align the marked holes in the Z-axis plate with the holes in the 12mm ball screw nut block below

M5x14 Cap Head Screw

Insert each M5x14 screw through the Z-axis plate, and thread them in to the ball screw block

Fully tighten all four M5x14 screws

1x NEMA23 Stepper Motor

8x M5x20 Cap Head Screw

4x M5 Nylon Locking Hex Nut

2x M3x25 Cap Head Screw

2x Rat Rig StrongHold PRO CNC - NEMA23 Plate

1x HTD3M 180mm Belt Loop

2x HTD3M Drive Pulley (1x 6.35mm Bore & 1x 8mm Bore)

1x SN04-N2 Proximity Sensor

SN04-N2 Proximity Sensor

Pass the end of the proximity sensor cable through the marked hole

M3x25 Cap Head Screw

Insert each M3x25 screw through the proximity sensor and thread them in to the M3 holes on the XZ joiner plate

Do not over tighten the M3x25 screws as doing so can damage the proximity sensor or the screw threads in the aluminium

HTD3M Drive Pulley - 8mm Bore

Install the HTD3M drive pulley on to the exposed end of the 1204 ball screw

2.5mm Grub Screw

If the drive pulley does not easily slide on to the ball screw, check that both grub screws on the pulley are clear of the bore

Tighten both 2.5mm grub screws to secure the drive pulley to the ball screw

NEMA23 Stepper Motor

Pay attention to the orientation of the stepper motor wiring / connector

Rat Rig StrongHold PRO CNC - NEMA23 Plate

M5x20 Cap Head Screw

M5 Nylon Locking Hex Nut

Insert each M5x20 screw through the NEMA23 plate, through the NEMA23 stepper motor mounting hole and secure with a locking nut

Repeat the instructions in the previous step to install the second NEMA23 plate

NEMA23 Stepper Assembly

Insert the NEMA23 assembly through the hole in the Z top plate as shown

Make sure the stepper motor wiring / connector faces towards the back of the X-axis gantry

HTD3M Drive Pulley - 6.35mm Bore

Align the HTD3M pulley on the NEMA23 shaft so that it is level with the HTD3M pulley on the ball screw

If the drive pulley does not easily slide on to the NEMA23 shaft, check that both grub screws on the pulley are clear of the bore

Fasten both 2.5mm grub screws to secure the drive pulley to the ball screw

Verify the both HTD3M drive pulleys are still aligned. Adjust the position of the NEMA23 pulley if required

Tilt the NEMA23 stepper assembly as shown

HTD3M 180mm drive belt

Install the HTD3M drive belt on to both pulleys

Allow the NEMA23 stepper assembly to return to the original position

M5x20 Cap Head Screw

Insert one M5x20 screw through each hole in the NEMA23 brackets as shown. Do not fully tighten the screws yet

Apply a small amount of downwards force on the NEMA23 assembly to tension the HTD3M drive belt

Whilst applying tension to the belt, fully tighten all four M5x20 screws to secure the NEMA23 assembly in place

StrongHold PRO X-Axis Gantry - Right Side

FF12 Circlip

Using a pair of circlip pliers, install the circlip on to the end of the ball screw

Make sure the circlip seats fully in the groove on the ball screw