Question de-racking trident gantry

[evan]

Printer Model

LDO Trident 300

Extruder Type

Galileo

Cooling Type

Stealthburner

Hi all.

A year ago I completed my Voron Trident300 (LDO kit). But I never did solve an issue I had with it, see here for details https://forum.vorondesign.com/threads/extrusion-or-bed-level-trident-300-build.715/

Because of the above issue it has sat unused for 6 months or more, can't remember exactly. I had reached a point where I had to 'take a break'. The kind where you don't intend on picking up where you left off

Fast forward to now and feeling a little more positive about it all I have totally disassembled the printer, re-printed all the parts in ASA and reassembled up to the x gantry assembly stage. In the process I have installed the trident pins mod and the BFI idlers.

Which brings me to a question I have concerning the bearings running roughly on the y rails. Would anyone have a proven process for de-racking the trident gantry? I have watched the usual de-racking videos from Nero etc.

The gantry runs smoothly from front to back when the x joint fasteners are left slightly loose. if I tighten (lightly - moderate) the movement feels as though bearings are catching / not rolling along the rails.

Just hoping someone may have a process or order to how they assemble and tighten the x gantry that works well?

Thanks all for listening!

 

[evan]

And a picture of my current process.

 

[majic79]

I found it helps to loosen the screws holding the XY-axis bracket (grey plastic pieces holding the bearing stacks) to the X-axis gantry, as well as the bolts holding the XY-Axis to the Y axis rails. Then as you de-rack, gently tighten (maybe 1/4 turn at a time) the three bolts/screws (remember the one on the underside of the rail) and the small screws going into the linear rails.

The other issue you need to check before you De-rack is that the rails run at the same height and there's no vertical offset between left and right sides - make sure the frame is square and the Y-axis are at equal heights, also make sure there's no twist in the rails pivoting around the endpoint mountings. I know the exact feel you describe, and it feels like it's a possible height offset (maybe something isn't seated right) and the XY-axis joints aren't running in exactly the same plane. You could check this by mounting a long flat bar to one rail carriage and make sure it seats nicely against the other rail carriage without being too high or too low

 

[evan]

Thank you majic79! I will try your approach over the weekend.

The frame is definitely square, or at least no more than 0.5 mm out, which I am assuming is ok. I believe I read somewhere that up to a mm out is ok.

 

[jmlw]

Resurrecting this thread because it seems to be the most relevant without making a new thread. I also have 300 LDO trident kit, rev. D and I've always had a little bit of skew.

I just installed BFI on my trident and while I was doing it I tried to re-align my gantry. I find that the x=0 left gantry joint will not touch the rear corner, but the right joint will. Same that the left joint will hit the front idler before the right joint does. While swapping front idlers I loosened all the two screws on top and the one on bottom of the XY joints but I wasn't able to make any real adjustments. I also loosened the bolts for the XY to linear rails but couldn't take out the skew of the gantry.

The gantry moves smoothly and I've been able to live with it / compensate with skew correction but I'm sure I could get it better. Just not sure where to look next. I'm waiting on a machinist square to get delivered so I can check the frame squareness.