Bruised Morse Tapers

[Andrew TinsleyParticipant @andrewtinsley63637]

I have about 25 large drills on 2 and 3 Morse tapers. Most of the tapers have dings and corresponding raised edges. Bearing in mind the quantity to be treated, what would you recommend as a method to get the tapers back to scratch?, Using a female Morse taper lined with silicon carbide paper works well, but it takes a long time to do a single taper.

Andrew.

[Neil WyattModerator @neilwyatt]

As the dings normally only constitute a few percent of the surface of the taper, I would remove them with a file or a touch from a grinding stone  in a Dremel or similar.

This will preserve as much as possible of the original surface for maximum accuracy and grip.

Neil

[Nicholas FarrParticipant @nicholasfarr14254]

Hi Andrew, I’ve just a file in a draw file fashion, that is, I hold the drill in my left hand, and run the file along the length of the taper towards the tang end, haven’t ever needed to put a lot of pressure on the file either and it’s always worked for me.

Regards Nick.

[ChrisLHParticipant @chrislh]

I’ve used those flat diamond sharpening “stones” (they are actually metal plated with diamond stuff) to true up bruised tapers. Just keep gently rubbing until all the surface appears to have been touched. Before I had the stones I used fine files to do the same thing.

[Michael GilliganParticipant @michaelgilligan61133]

Same as ChrisLH

The Eze-Lap branded ones seem particularly good quality, and the version with a handle suits this sort of work very well.

https://www.ezelap.co.uk/product-category/eze-lap-diamond-hone-stone/

https://www.ezelap.co.uk/product/eze-lap-fine-grit-600-red-handle/

MichaelG.

[Mike HurleyParticipant @mikehurley60381]

Agree with the others, a very gentle use of a fine file or stone/diamond lap in the dings only should be all thats needed. Fingernails are incredibly sensitive in gauging progress when passed over things like these.

I personally would be wary of trying to be too agressive as you could end up make things worse.

It’s the sort of job I would put on the side of the bench and just have a go every so often when you’ve got a spare few minutes, rather than find it getting tedious because of the number you’re trying to do in a big batch!

Treat it as therapy – nice bit of straightforward, calm work, not much thinking?

Mike

 

[ChrisLHParticipant @chrislh]

What I forgot to say is “keep going until all the surface shows signs of having been touched with the exception of the depressions left by the dings”.

[Andrew TinsleyParticipant @andrewtinsley63637]

Thank you all, I shall try the Eze Lap  Method, Sounds good in terms of speed and accuracy.

 

Andrew.

[Howard LewisParticipant @howardlewis46836]

My vote is for use of a diamond file until any raised metal has been removed  to allow as full a contact of the original taper with its counterpart.

The actual area lost to the dings will be a small % of the total.

Howard

[Michael Gilligan]

On Michael Gilligan Said:

Same as ChrisLH

The Eze-Lap branded ones seem particularly good quality, and the version with a handle suits this sort of work very well.

https://www.ezelap.co.uk/product-category/eze-lap-diamond-hone-stone/ minersgarden

https://www.ezelap.co.uk/product/eze-lap-fine-grit-600-red-handle/

MichaelG.

These tools are known for their quality and durability, making them suitable for a variety of jobs.

[Andrew TinsleyParticipant @andrewtinsley63637]

Eze Lap tool arrived this morning. I have just had atrial run and I must admit it is both fast and easy to use. I know have covid, so I shall use the time profitably and get the drills in good order

[GeorgineerParticipant @georgineer]

Another approach is the ‘burr file’ – a fine file with the tops of the teeth ground off. This will remove the tops of any upstanding burrs but not damage the surrounding undamaged area.

George

[Andrew TinsleyParticipant @andrewtinsley63637]

I like the idea behind a flat burr file. I assume these are flat files. Do you have to make your own, as they don’t show up when doing a web search

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