Step by step, lots of pics, few words. Click on the pictures to enlarge them.
|Using the XYZ part, 4 1.25″ bolts, lock nuts and 608 bearings assemble as shown. Make sure the bolt heads face as shown for Z-Axis clearance. Do this for both parts.These bolts can get snugged up and should not be touched again.|
|XY part, 4 1.25″ bolts, nuts, and bearings. Assemble these as shown with the heads out. Do it for both XY parts.|
These bolts can get snugged up and should not be touched again.
This step uses the XY, XYZ, Lock Nut, 5″ bolt, bearing, and a nut. The 5″ bolt goes through the XYZ plate, then Nut Lock, into the small hole on the XY part trapping a bearing in the gap. The head of the 1.5″ bolt on the XY part should face the XYZ plate.
Add the other XY part and trap the next bearing the same as the previous step.
Add the Spacer, then the other XYZ plate.
Add the lock nut to the bottom of the XYZ plate and 5″ bolt.
Tension Bolt B – Controls X and Y Rail tension only.
This should be left extremely loose, just tight enough to engage the nylock on the lock nut.
These 4, 2.5″ bolts, bearings and lock nuts finalize the assembly.
Tension Bolts C – Control Z Rail tension, slight effect on the squareness.
These should be left extremely loose, just tight enough to engage the nylockon the lock nuts.
Now that the assembly is complete, this is the best time to double check to make sure the rails are perpendicular. An inexpensive square works just fine, If you don’t have one you should have one on hand they tend to come in handy once and a while with a cnc machine. Both of the ones pictured above were about $5.
Insert all 4 rails into the assembly.
The least amount of tension on the rails is best. You are aiming for all bearings touching and smooth movement in the following steps. If your bearings aren’t already making contact you might have odd sized conduit, make sure you are using the right size for your parts. C=23.5mm OD, F=25mm OD, J=25.4mmOD.
First check that the X and Y rails are equally tensioned in the XY blocks, all the bearings should make contact. If you need to add any tension start with “Tension Bolt A”, at this point it is best to leave “Tension bolt B” loose (it locks the assembly in place as well as rail tension).
Second step is to make sure the Z rails have equal tension and all the bearing are making contact. If you need to add any tension use the “Tension bolts C”.
Use a square to see if your rails are, well, Square. If they are, give “Tension bolt b” a turn or two, making sure the X and Y rails are still free to move. If your assembly is not square loosen all the tension bolts up and flex it in the direction needed, then tighten the Tension bolts one at a time to see which on is causing the issue. I’m sorry there is no magic bullet for this part. For most people this should go together square as is, but if you are having issues it is much easier to adjust it here, like this, before putting it on the rest of the machine.
-Everything past this point is for the old center assembly-
Snug not tight.
Rigid Middle Z, 1.25″ bolts, Bearings, lock nuts. (same for regular middle z)
3″ bolts, bearings.
Add the lock nuts, loose until the other half is fit.
Add the other half, with 3″ bolts, bearings, lock nuts.
Snug up all 4 lock nuts.