Jump to content
lars preisser

broken screws on kinoptik paris viewfinder of eclair acl 2

Recommended Posts

hi I just noticed that on the viewfinder of the eclair (kinoptik paris) there are 2 broken screws so the viewfinder is a bit rickety and therefore also noisy.

Does anyone have an idea on how to get the rest of a tiny screw out of its thread... the problem is it does not stick out at all.

 

lars

Share this post


Link to post
Share on other sites

It can be tricky with very small screws, but the the first and easiest solution is to drill a hole through the centre of the screw stub and then use an easy-out (sort of a tapered reverse thread tap) to jam in the hole and unscrew it. Very small easy-outs can be hard to source, I have sometimes made a tool by grinding a small slotted screwdriver into a slight taper and puting a cutting edge on the sides. The hardest part is drilling through the centre of the screw and not allowing the drill to wander off, otherwise it will destroy the softer surrounding material (probably aluminium) rather than the much harder screw. If the broken screw edge is sloping you will need to use a small milling bit to flatten it, and preferably punch a centre dent as a guide for the drill bit, otherwise you'll have no chance of drilling throught the centre.

 

If the screw is rusted in or otherwise won't unscrew using an easy-out (and you've tried soaking it in antiseize and applying heat to the surrounding material) the next solution is to drill the screw out completely by using a drill the same size as the tapping drill, which leaves just the spiral of thread to pull out with pliers, but you obviously needed to have been very accurate and drilled straight down the very centre of the screw stub with your first hole.

 

The next solution is to drill or mill out the whole area and replace it with a lathed cylinder of aluminium, and then drill and tap a new hole.

 

The last option is to have the stub removed by spark erosion, or chemical means such as alum or acid (depending on the materials).

Share this post


Link to post
Share on other sites

I should add that if the screw hole is not blind, in other words it goes through to the other side of the material, attempting to drill the screw stub will sometimes screw it right out the other side.

 

It's also always worth trying to just unscrew it with a sharp dental pick or sticky-ended poker - sometimes it doesn't take much force to unscrew, but most times I find this doesn't work.

Share this post


Link to post
Share on other sites

I should add that if the screw hole is not blind, in other words it goes through to the other side of the material, attempting to drill the screw stub will sometimes screw it right out the other side.

 

It's also always worth trying to just unscrew it with a sharp dental pick or sticky-ended poker - sometimes it doesn't take much force to unscrew, but most times I find this doesn't work.

thanks for that info, will try that.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



  • Just Cinema Gear



    Metropolis Post



    Paralinx LLC



    Abel Cine



    Wooden Camera



    Tai Audio



    Gamma Ray Digital Inc



    G-Force Grips



    New Pro Video - New and Used Equipment



    Rig Wheels Passport



    CineLab



    Ritter Battery



    Glidecam



    Broadcast Solutions Inc



    Media Blackout - Custom Cables and AKS



    Visual Products



    Serious Gear



    FJS International


×
×
  • Create New...