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My round holes are not coming round

Hello, Im trying to figure some teething problems with my new workbee and i cant get my head around why a round hole wont machine out round, it is slightly oval. I have machine the base level but the next step of putting holes in the base for pegs and things isnt turning out that great. i have just tightened the wheels on the extrusions just a bit to see if that helped but i cant see anything else that may be loose. Thanks

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Hi Chris,

I had the same problem. My X & Y-Axis Carriages were not tightened enough.

When the machine is off, try moving one carriage back and forth (push and pull slightly while holding a plate).

It shouldn’t move. If it moves tighten the Nut Blocks as in step 5 of manual ‘Final Assembly & Testing - testing your workbee’.

hope it helps.

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Thanks for the suggestion Damien!

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Many thanks for the responses. Happy new year to everyone. I have gone around and given everything a good tighten, ran the calibration and then skimmed the board again and it seems to have solved it all, there is a minor issue that the holes are undersized by about 0.4mm. Its more noticeable on the small gauge but it seems to be consistent. I'm working with it now as it is, I'm going to monitor how it goes in the next few weeks/months.

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Some end mills can be slightly undersized on the diameter. May be worth a measure as a quick check?

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Glad you solved your issue. For the undersize, I would check your endmill diameter as Peter said above, if that is correct, you may need to adjust your steps/mm

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Did you calibrate your x, y, z-axis? If not, this may help https://www.youtube.com/watch?v=PsCiCDZe...

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Hi Chris,

Thanks for your question.

I would also check that the grub screws and bolts are tight on your flexible couplers. Insure a grub screw is on the flat portion of the stepper motor shaft.

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Author avatar Chris Biggs will be eternally grateful.
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