Cheapskate wheel friction

[lumpy_potato]

Hi all,

As I continue to calibrate my Rostock, I've come across something that I'm thinking might be at least somewhat of an issue.

I noticed as I was testing the individual wheels on each cheapskate, that some 'grip' the rails more than others - e.g. with a single finger, turning that wheel will move the cheapskate up or down.

The question is - should this be uniform across every wheel and each bearing? I've noticed that different wheels have slightly different amounts of friction on the rail. None of the cheapskates budge or what have you, so they are tight - but I realized that they may be tight due to one wheel being 'strong' instead of both of the wheels controlled by the eccentric spacer.

Also, what is better? minimal friction (e.g. spinning a wheel does not move the cheapskate, but the cheapskate is still solid on the rail and does not wiggle), or enough friction where at least two (if not all four) can move the cheapskate?

I've noticed that in all directions, if I have a repeating pattern, there tend to be 'dips' or 'bulges' at the same points - it just occured to me that if each bearing grips slightly differently, at a fixed position for each wheel I might get a 'wiggle' that results in things being 'off.'. It might also explain the not-so-straight sides I get.

Thanks!

[dajay23D]

i have a similar situation where one wheel is not completely contacting the rail while the 3 other wheels move. This is one of the wheels on the cam spacer side. The top one. During this situation, the assembly slides as it's supposed to. However, when I get that one wheel to contact, it's tighter than it should be and i feel more friction. So I just left it. I was able to adjust all the other assemblies just fine and all the wheels move. Except for that one. I just finished the build last night and everything seems to be working...so far.... knocking on wood. Later this week, i'll upload the firmware/software..etc. Hopefully, I can start printing by this coming weekend.

[geneb]

Did you watch the video that shows you how a correctly adjusted Cheapskate should act?

You need all four wheels contacting the tower. Adjust until you've gotten it corrected.

g.

[lumpy_potato]

I think I've got it as of yesterday - I need to print more calibration objects but the MakeTest XY resonance model looks a lot better than what I remember in the past.

I think I had adjusted them initially such that they did not wiggle on the rails, and all fell at the same rates - but I didn't check to see that the amount of friction per wheel was consistent on all three cheapskates carriages.

Still am thinking of slapping the tricklaser arms on there to see just how much of a difference those make in addition to that change to the cheapskates. Would be nice if that got everything nice and tight.