Maho mh600e strange x axis

there is a certain spot on the x axis travel where the axis jerks and produces an following error.

The spike is sometimes sharp and sometimes it stays flat on top and comes back to zero after 1 second.

Had the same problem with the original philips 432 control

Have you checked the linear scale?

Iam on it right now. I've marked the spot and I'll try to check if I can see something without taking it out of the machine.
Its alot of work

Okay, problem seems to be solved.
I ve given the linear scale a good amount of break cleaner right into its guts and ive fiddled the cable isolation to the housing of the exe card. Isn't well done there. One of these solved the problem so far. I will investigate.

But at least new scales are 70€ instead of maho used one for 400€

okay, problem not solved. Only helped for 15 minutes.

Here are the instructions I used to clean my scales...
blog.repairzone.com/cleaning-heidenhain-linear-scales/
Mark

I´ve taken the scale out again and filled the whole scale with isopropanol and gave it 20 seconds heavy shaking.
The smears i could see before were gone after that. After reinstalling i got no readout at all
I´ve checked again if there is only one dead spot. Whole way was dead, no reading at all.
I´ve then removed the spacer that came with the old scale and that solved the problem.

Somehow the replacement scale did not work at it´s best with the old spacers from the original scale.
So the scale went like 1,5mm closer to the table and it works.

Hello,
installing a scales should be done very carefully. The distance between head and scale 1mm is very important. (See picture for tool) And it should also be straight on 10-20µ. The optical scales from heidenhain are very robust. But you can't do that with any other manufacturer. A magnetic scale is definitely scrap afterwards. Be careful, the things should also measure precisely otherwise you will have even more problems.

I don´t know what´s with other brands but the Heidenhain are ok with 0,1mm deviation on 600m travel in vertical and the machine itself is parallel.

Inside the scale the head is guided with alot of bearings and the head itself is swimming freely in their held by two springs that have about 3 mm travel each. But it seems like the Heidenhein doesn´t like to be out of alignment too much.