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VoronDesign / Voron-0

Voron 0 CoreXY 3D Printer design
GNU General Public License v3.0
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Recommend revisions to V0.1 bed construction #89

Closed fwiffo closed 2 years ago

fwiffo commented 3 years ago

Having gone through a couple rebuilds of my bed, I'd like to offer a few suggestions for refinement:

  1. Ditch the printed thumb knobs and go back to the knurled metal nuts from V0.0.
  2. The Z adjustment screw hole strips out quickly. Thicker walls or something might help.
  3. Put washers between the springs and lock nuts to keep them from getting cockeyed and buckling. I had a bad problem with mine shifting around on the nuts while adjusting. Adding a washer gave them a flat surface to push against.
  4. Make the holes for the springs a bit shallower. That gives them a bit more tension at a given height making adjustments more reliable and gives a wider usable range.
nemgrea commented 3 years ago

spec will stay with printed knobs for bom/cost reduction purposes. metal thumb nuts are still supported if users choose that route

we will monitor the thread stripping issue on the t-nut block so far this is the first mention of this issue ive seen

looking into adding the washers to help with the flat surface issue. this will require cad/manual updates

the hole depth for the springs is at its current depth to allow the full 120mm travel in z having the bed sit higher up may eat into this space. simply tightening the thumb nuts should compress the screw to whatever preload amount you would want. these parts will stay as modeled.

fwiffo commented 3 years ago

I'm talking about the screw that hits the Z endstop switch (page 102 of the manual).

On Thu, May 20, 2021 at 10:04 AM nemgrea @.***> wrote:

spec will stay with printed knobs for bom/cost reduction purposes. metal thumb nuts are still supported if users choose that route

im not sure what z adjustment holes would be stripping? we dont have any bolts threading into printed parts on z axis stuff

looking into adding the washers to help with the flat surface issue. this will require cad/manual updates

the hole depth for the springs is at its current depth to allow the full 120mm travel in z having the bed sit higher up may eat into this space. simply tightening the thumb nuts should compress the screw to whatever preload amount you would want. these parts will stay as modeled.

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Megamannen commented 2 years ago

Threading in plastic is really bad if you adjust it often. But I'm guessing this is a "set once or twice" for most users, in that regard it doesn't matter.

But the Voron is filled with threaded inserts, so what is one more?

nemgrea commented 2 years ago

But the Voron is filled with threaded inserts, so what is one more?

the inserts do not have any thread locking ability, simple vibrations would cause the screws to move and thus throw off your z height. you need a plastic thread such as a nylock nut or similar to keep the screw from drifting. threading into the plastic directly has this same effect

Megamannen commented 2 years ago

Right, of course

On Mon, 7 Feb 2022, 16:16 nemgrea, @.***> wrote:

But the Voron is filled with threaded inserts, so what is one more?

the inserts do not have any thread locking ability, simple vibrations would cause the screws to move and thus throw off your z height. you need a plastic thread such as a nylock nut or similar to keep the screw from drifting. threading into the plastic directly has this same effect

— Reply to this email directly, view it on GitHub https://github.com/VoronDesign/Voron-0/issues/89#issuecomment-1031578751, or unsubscribe https://github.com/notifications/unsubscribe-auth/AEUGJSCKUFAPVGPV5SKHV4DUZ7O4BANCNFSM446GJTGQ . Triage notifications on the go with GitHub Mobile for iOS https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675 or Android https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub.

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staffert commented 2 years ago

Simply using a second locknut would provide ample locking of the screw, or a brass heat insert with thread locking compound would be a better long term solution than simply a hole into plastic.