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Robo3D: Leadnut adapter with z-axis limit switch

by kabe Jun 22, 2014
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Really nice design. I ordered the lead screws and couplers and can't wait to install them this weekend. Did you put any lubrication on the screws or just leave the Delrin alone?

In my case, delrin was little tight and I used silicone oil for bicycle chain.
And I have to say, my Robo3D could not move Z to home smoothly with this mod at first time. It was because of friction by not only delrin, but also two Z-rods were not parallel by the assembly quality.
You also might be good to measure distance between the Z-rod at the top in each of when z is top and bottom. Mine has 2mm difference and I've solved it by cutting smooth rod hole on X-idler little deeper.

I have the rods and adapters, but haven't yet installed them (I'm waiting for me to finish doing the Linear Y-Axis mod when I have to tear the printer apart anyway.)

When I've tried by hand to turn the delrin nuts on the rod they're quite tight, so I was going to use a dry PTFE/Teflon lube on the rods.

I don't know if Kabe has any other advice on it, hopefully he'll reply. =)

I've read that delrin nuts may need to be worked in. I'm going to edit some gcode to repeat a Z up and down many times.

Yeah, I'm also waiting for my Linear Y-Axis mod.

Oh, I've got the y axis mod parts... Just a matter of finding the time and energy to do it. I'm also replacing the steppers with Kysans when I do it, just because. =)

Just got mine as well. The nuts were pretty tight at first. I gently clamped the ACME rods in a hand drill and ran the nuts back and forth a bunch of times. They are now really smooth. I suggest doing this before assembly. I also marked on one of the rods and nuts with a sharpie to make sure they stayed paired in case there is a difference in the rods. BTW - I'm using my son's thingiverse account here. On the Robo3D forum my user name is SteveC. I'll post here and there how well it works out. Still annoyed that I did not get my Y mod in yet!

So how do you have this connected to the delrin nut? Just a screw through the delrin and into the plastic of the adapter? No nut or anything?

If so that'd be what, an M3x8mm or so? Measuring the delrin nut I have and the adapter it looks like they're both about 5mm thick.

Just want to make sure I'm on the right track before I start to tear things apart and do the rod replacement. =)

I added a picture of the screw.
Diameter is about 3.5mm and freely through delrin nut.

Self-tapping screws.

How close to the motor coupling is the bottom of the white screw when at Z home? It looks like it might be cutting it pretty close (not that it matters really).

I added a picture.
This has replaced coupler 5mm-8mm to 5mm-6.35mm, and JHead to E3Dv5. But it does not matter in non-modified.