x2 cncfusion kit#2 - Problem with Z axis binding

[dimitriosart]

Hi guys,

Last weekend I finally mounted my cncfusion #2 kit on the Sieg X2 mini mill. I have a big problem on the Z axis. Cncfusion is not replying to my emails.

When I mounted the ballnut block on the side of machine, with the 2 snugly fit screws and the 12mm bolt, the Z motor mount was like slightly behind the column, I was able to to pull it forward a bit with loose screws; holding the shaft by hand, and tighten the screws back in. Now the back of the Z motor mount was nice flush with the column.
The biggest problem is, the ballscrew was slightly leaning to the right. Aligning the Z motor mount, looking at the center screw (from plastic stop on column), I had to pull the ballscrew slightly to the left, to get the center hole aligned with the center hole in the column. The Z motor mount sits nice flush on top of the column and I continued drilling the 2 holes and put the screw and nut in. Again, Z motor mount sits flush on top of column, center screw nicely aligned with the hole in the column, but I had to slightly pull the ballscrew to the left to accomplish this. And this is where the problem lies.

I put up a video on youtube that shows the movements. The Z axis goes kinda down easy, but up is a problem halfway, I hear click click click by ballscrew nut.
the video is here:

I have a feeling that the bore of the ballnut block is not perpendicular with the edge so that's why the ballscrew is not straight? I mean, the ballnut block is flush mounted on the edge of the column, why is the ballscrew not straight?

Can you help me out please?

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[pws]

Same parts here. I found that your focus when assembling the Z ball screw should be totally on getting the screw straight and parallel - don't worry about the various "pieces" aligning with other pieces - just get the screw straight and parallel and all will fall in. Loosen the attachment bolts on the nut mount and the motor mount so the mounts will move with a LITTLE force - run the head up and down and "help" align the blocks while watching the screw travel. Eventually, you will get a "feel" for how things interact and should be able to get things aligned. This part took me the longest to get aligned! My Grizzly setup is a "mongrel" in that I first bought a Large Table and adapted it to CNC (left my mill alone so I could make mods to the Large table as I adapted it), then replaced the standard table once the CNC was working 100%. I am now about 85-90% done and so far I am very pleased. I decided to go the LinuxCNC route, so I am now in the process of wrapping my head around that! So far, also pleased with that part too. All around, it has been a real fun project. You need to be very patient!

Good luck.

[dimitriosart]

hi pws, thanks for your reply, that's exactly what I did yesterday, I noticed the side mount block is not 90 straight due to the holes in the block not being on the same position as on my machine. I took them out, pulled it straight and drilled a 3 hole and tapped thread. Now this side block is straight. Now, on the top Z axis motor mount, I have to do thesame thing. Those holes are like 4mm off.
I posted two more videos showing what I mean.:



and



cncfusion never answered. I am not happy being this money and having all this trouble what I wanted to avoid in the first place

[dimitriosart]

measurement of sideblock from top edge


measurement of sideblock from bottom top edge

[dimitriosart]

Z axis motor mount holes not aligning, got to re-drill the holes in the mount and block!Attachment 190928

[ViperTX]

The clicking sound is not normal. Sounds like not enough balls and a lack of grease. I would return the z-axis to CNCfusion.

How does it feel and sound when you turn the ballnut by hand?

[SteveinSD2]

I have exactly the same problem.

[pws]

I have exactly the same problem.

If you mean "Problem with Z axis binding", then it is all about alignment - from end to end. You need to make the appropriate adjustments to each end. I have had mine off and on a few times and it takes a bit, but always manage to get the adjustments so there is free travel up and down to the ends. I originally had to modify one of the holes on the Mill column as the holes on the Mill didn't match the top plate, but no problems with binding.

[SteveinSD2]

If you mean "Problem with Z axis binding", then it is all about alignment - from end to end. You need to make the appropriate adjustments to each end. I have had mine off and on a few times and it takes a bit, but always manage to get the adjustments so there is free travel up and down to the ends. I originally had to modify one of the holes on the Mill column as the holes on the Mill didn't match the top plate, but no problems with binding.

Thanks. I was told that the ways on the column were out of alignment so I just ordered a new column from LMS and will see if everything fits better with it and the cncfusion bolt on kit. Thanks for the reply. :-)

[kawazuki]

As I remember Michael @ CNCFusion is a hobbyist and does this part-time / has a real job to pay the bills so expect a delay for email.
Its not the kit that is at fault its generally the very variable quality control from the mill manufacturers in China - a degree of 'fettling' is to be
expected - its just not stated that explicitly in the sale blurb!

[SteveinSD2]

I love the cncfusion kit and believe that Michael was very helpful. It is the quality of the x2 mill from Harbour Freight that is in question. Thanks for the reply.

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