Worn leadscrew?

With htd5 belt, 1:2 ratio.

Clearly something in the system is non-linear. Have you measured that the pitch of your ballscrew is constant along it's length?

Have you measured that DRO error in both directions? What's the Backlash?

Otherwise I don't know how it could be anything but a broken encoder or some screwy software based correction.

I will check if the pitch is constant.

On previous post i posted picture where i engraved ruler in both directions, no visible deviations, backlash is minimal, around 0.03mm.

I switched the motors, same error. I switched the drives, same error. Looks like mechanical error, worn leadscrew/nut i guess. I highly doubt mach3 would have a bug?

So, i have replaced ballscrew with new one, reinstalled the mach3 and the error is still there. I have no more ideas what could be wrong. Could be CSMIO IP-S motion controller faulty?

so i finally found the issue. One of the gantry linear rail was worn out causing z axis to swing left and right on the bottom at endmill.

Quote:

---

Originally Posted by Husky1

so i finally found the issue. One of the gantry linear rail was worn out causing z axis to swing left and right on the bottom at endmill.

---

Well, that's a first to me, I've never seen linear rail wear out and cause such an issue. I'll put that one in the data bank to watch out for.!

Quote:

---

Originally Posted by JAZZCNC

Well, that's a first to me

---

If true, could this be indicative of some other underlying problem than "wear and tear"?, misaligned rails?

Quote:

---

Originally Posted by Doddy

If true, could this be indicative of some other underlying problem than "wear and tear"?, misaligned rails?

---

Absolutely and very probably is due exactly to that reason. Or they are really cheap nasty rails and poorly aligned.? I've never had a rail wear out to that degree and I've probably got 100+ machines out in the field using them and many of them used 12hr 6Dwk with minimal maintenance with several over 10yr old so if quality rails like Hi-win then I'd definitely be looking for some other issue causing this.

i am using 15mm tbi motion linear rails on the gantry. I have changed my setup 6 months ago, moved leadscrew too high above the linear rails. I am always pushing my machine to the limits of the spindle (3000mm/min, 2mm wall, 15mm deep, 10mm endmill). I think this was the cause to wear them. I didnt have any issue before the change.

I am changing gantry rails now with 25mm, and putting leadscrew between the linear rails. Considering buying 6.6kw hsk63 spindle.