Upper surface keeps breaking

[amcewen]

The laser-cut upper surface piece keeps snapping across the narrow part where the cut-out for the "mountain" part fits.

We suspect that it's caused by the stresses being focused in the sharp corner of the cut-out. Rounding off that corner might fix things, which will need modifications to both the laser-cut part and the 3d-printed "mountain"

[Kate2000]

upper_surface_5mm_385mm.zip

I think this is the right sized version of the upper disk (385mm not 305mm) but it needs the circles on those corners.

[Kate2000]

I've added in the circles (5mm) to save time.
Can you check if its ok? If not please can you re-do?

upper_surface_5mm_385mm_mod.zip

[JackiePease]

Great – I’ll cut it tomorrow evening (13 June) then, unless anyone objects before then

From: Kate Northmailto:notifications@github.com Sent: 12 June 2017 18:55 To: DoESLiverpool/circular_kniticmailto:circular_knitic@noreply.github.com Cc: Subscribedmailto:subscribed@noreply.github.com Subject: Re: [DoESLiverpool/circular_knitic] Upper surface keeps breaking (#11)

I've added in the circles (5mm) to save time. Can you check if its ok? If not please can you re-do?

upper_surface_5mm_385mm_mod.ziphttps://github.com/DoESLiverpool/circular_knitic/files/1069056/upper_surface_5mm_385mm_mod.zip

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[huffeec]

The new circles are slightly out of round. It's especially a problem with the lower circle. @paulgeering and @Kate2000 traced the problem with Gerald slightly distorting cuts 45 degrees to the axis. We've sanded the current cut to fit the bearing and that should work for MakeFest. So the Knitic can be reassembled but longer term would benefit from new cuts.

[JackiePease]

I bought a new piece of acrylic to make new circles once Gerald is fixed. I've written Knitic on the plastic covering, and stored it by the big pieces of polycarbonate for the moment

[DefProc]

Gerald should now be ready for cutting rounds https://github.com/DoESLiverpool/somebody-should/issues/517