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broken screws on kinoptik paris viewfinder of eclair acl 2


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#1 lars preisser

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Posted 25 February 2018 - 05:45 PM

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


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#2 Dom Jaeger

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Posted 25 February 2018 - 08:01 PM

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). 


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#3 Dom Jaeger

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Posted 26 February 2018 - 08:34 AM

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.
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#4 lars preisser

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Posted 26 February 2018 - 08:54 AM

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.


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