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bitraf / bitraf-cnc

CNC-related research and projects at Bitraf
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Hattori: there is a problem with the X-axis, giving inaccurate positioning #19

Open tingox opened 6 years ago

tingox commented 6 years ago

there is something wrong with the X-axis on Hattori, resulting in inaccurate positioning and poor diagonal operation. (Apparently, some people have known about this problem for some time too. We should improve our issue documenting procedure).

We should open up Hattori and check the X-axis to figure out what the problem is:

Getting access to the back side of Hattori is not easy with the current way it is mounted into the cabinet. Fixing / improving access is a separate issue (#20).

tingox commented 6 years ago

New information received from the creator of Hattori a few days ago: the "tightness" of the X-axis has been there from day one. His suggestion is to build a newer, better machine. He thinks the problem is either from the implementation or the design of the machine.

Reminder to self: ask about the other Hattori: does it have the same problems as this one?

tingox commented 6 years ago

On Kuben they have modified the glide blocks (POM) on the X axis by removing some material with a Dremel, effectively creating "pockets" and less surface (= less friction) between glide blocks and the other part. (This workaround increases dust accumulation in the modified area)

tingox commented 6 years ago

Another (better) option is to replace the current X-axis on Hattori with the new type of axis (using ball bearings), as used in machines like Hedy.