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Heated Bed Hex Screw is Striped, and Stuck  

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CptJellybeans
(@cptjellybeans)
Active Member
Heated Bed Hex Screw is Striped, and Stuck

Hey All,

One of the nine hex screws that attach the heated bed to the sliding tray is striped and I can no longer remove that screw or use it to adjust bed leveling.

I've tried a bunch of different things:

  • Using the rubber band trick
  • Using slightly large allen key. Actually I've used my entire set both metric and imperial to no effect.
  • Using a lot of force
  • Using a very tiny screw extractor (made it worse, I think).
  • I tried to use a flat head screw set. I've tried to cut teeth into it to use the flat head screw, but nothing I have can cut into it.

Does anybody have any ideas on how I can remove this screw? And also where can I buy a replacement?

This topic was modified 2 years ago by CptJellybeans
Posted : 19/07/2019 1:03 am
cwbullet
(@cwbullet)
Illustrious Member
RE: Heated Bed Hex Screw is Striped, and Stuck

Keep going up on the size of extractor until it comes out but avoid one that might damage the board.  I have even gone to drilling them out (this takes special skill).  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 19/07/2019 10:22 am
CptJellybeans
(@cptjellybeans)
Active Member
Topic starter answered:
RE: Heated Bed Hex Screw is Striped, and Stuck

Thanks for the suggestion/tip.

I tried using a larger screw extractor. It's not catching on. I think the material that my set is made of is too soft? I tried drilling it out a little so it has a smoother service for the various screw extractors to bite in. But it did not work.

This weekend I will disassemble the tray entirely to remove that screw.

Posted : 20/07/2019 1:56 am
JoanTabb
(@joantabb)
Moderator
RE: Heated Bed Hex Screw is Striped, and Stuck

worst case, you could cut through the spacer, beneath the heatbed, with a dremmel and cutting disc, use pliers to remove the screw stub and replace the screw with a new screw and spacer or use the nylock nut method

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 20/07/2019 10:18 am
cwbullet
(@cwbullet)
Illustrious Member
RE: Heated Bed Hex Screw is Striped, and Stuck

Not all screw extractors are created equal.  Try a different one.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 20/07/2019 10:46 am
CptJellybeans
(@cptjellybeans)
Active Member
Topic starter answered:
RE: Heated Bed Hex Screw is Striped, and Stuck

I tried a different set that has a hand tapping mechanism, no luck.

I tried to disassemble the tray, remove all other 8 screws and simply spin the bed until the stuck screw releases. Turns out that another screw was also stripped so I couldn't do that. 

I clamped down the assembly and used a Dremel sideways cutting tool to cut through the spacer. Yes, it worked ... but I inadvertently cut through one line of the PCB copper.

This adventure has come to an end now. I am now ordering a new heatbed since the old one is cut. 🙁

Thanks for all the help/tips/comments all!

Posted : 20/07/2019 6:18 pm
JoanTabb
(@joantabb)
Moderator
RE: Heated Bed Hex Screw is Striped, and Stuck

check the heatbed  resistance, on the mk2, the bottom layer was reportedly not used

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 20/07/2019 6:45 pm
CptJellybeans
(@cptjellybeans)
Active Member
Topic starter answered:
RE: Heated Bed Hex Screw is Striped, and Stuck

Wow I did not know that. Constantly learning here!

Broke out the multimeter and measured 2.8 ohms between Vcc and Gnd. Is this an appropriate resistance for a 24V bed?

Google search shows RepRap 24V beds are within range at around 2-5 Ohms. I guess this is similar?

Posted : 20/07/2019 7:08 pm
JoanTabb
(@joantabb)
Moderator
RE: Heated Bed Hex Screw is Striped, and Stuck

Could save you a few Shekels!

 

another test, is there any continuity between the damaged areas and the power wires...  the top and bottom areas MAY be in parallel...

 

Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 20/07/2019 8:19 pm
CptJellybeans
(@cptjellybeans)
Active Member
Topic starter answered:
RE: Heated Bed Hex Screw is Striped, and Stuck

Thanks Joan!

No continuity on the damaged section on the bottom with either Gnd or Vcc. Looks like your insight is correct, the bottom sections do not seem to be utilized--which makes sense why heat the bottom the pieces is on top!

I went ahead and canceled my replacement heatbed order. 😉

Many thanks!

Posted : 20/07/2019 8:46 pm
JoanTabb
(@joantabb)
Moderator
RE: Heated Bed Hex Screw is Striped, and Stuck

Good luck

Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 20/07/2019 10:30 pm
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