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Step 10 - Y-axis: Geometry Check  

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scott.b47
(@scott-b47)
Trusted Member
Step 10 - Y-axis: Geometry Check

I cannot get my y-axis geometry true. I built the thing according to the instructions, being careful to evenly torque. Since then I've torn it apart and redone it a half-dozen times. I even went to my perfectly-flat steel platform, clamped the frame down by running a horizontal bar across the two long supports, and torqued it all down again. It still wobbles when put on a flat surface. I'm at my wits end with what to do with it at this point.

The wobble is approximately 1mm (i.e. putting a 1mm feeler gauge under the front right corner will eliminate the wobble).

What should I do? I assume this is far enough out of tolerance to cause issues?

Thanks, Scott.

Publié : 21/12/2018 10:14 pm
thrawn86
(@thrawn86)
Honorable Member
Re: Step 10 - Y-axis: Geometry Check

how much "clamping" are we talking about here? you shouldn't have to do any more than just holding it flat by hand, lest you strip out or bend the screws.

can you get either half square at all?

Publié : 22/12/2018 1:36 am
scott.b47
(@scott-b47)
Trusted Member
Topic starter answered:
Re: Step 10 - Y-axis: Geometry Check

I took everything apart (again), checked to make sure there were no burs on the ends of the extrusions, swapped parts left and right, and torqued it all down again. I think it's better, but perhaps still not perfect. I've reached the limit at which I feel comfortable working with the metric machine screws, the alan sockets are starting to get a little rounded, I'll need a new pack of screws to try it again. I moved on, put the rubber feet under the extrusions, and am going to pretend it's all perfect.

Regarding the clamping, I clamped it very lightly. About the same amount of force as a human pushing down on the other half of it, if I'd had a second human handy. Some of what I read here and on the wiki led me to believe that clamping one half of it while pushing down on the other half might help. In my experience, it really didn't make any difference.

Publié : 22/12/2018 3:38 am
Mustrum Ridcully
(@mustrum-ridcully-2)
Honorable Member
Re: Step 10 - Y-axis: Geometry Check

Take it to the live chat it sounds like one of your extrusions has been not cut square.
do you have access to a good quality carpenters try square? Check the cut on the end of each extrusion.
if you or a friend has polished stone countertops they are going to be the flattest surface you have access to. in a pinch you could go to a kitchen show room and ask if you could have a few moments to check your frame.... stand each each extrusion on its end and move them close to each other do this for both ends a bad cut will show when something is closer at the top than at the bottom ie not parallel take cell phone pictures and use them during your support chat there is a icon in the box you tipe in that will let you select photos to share with support.

Publié : 22/12/2018 4:32 am
Bunny Science
(@bunny-science)
Noble Member
Re: Step 10 - Y-axis: Geometry Check

Also check the ends of the extrusions and around the screw holes of the plates for small burrs.
If present, those can throw things off despite the actuals cuts being square.

Publié : 22/12/2018 6:45 am
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