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carlos

drill bit sharpeners

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The first thing we had to make in our apprenticeship was a simple drill angle gauge, the 2nd thing we learnt in our apprenticeship was how to sharpen drills.

A skill that is fairly easy to learn when shown and understood, usually I find that each side is usually only requires a couple of kisses with the grinder wheel done in a rolling action, it is usually that quick and light that very little heat is generated on the drill bit.

Definetly a valuable skill to learn.

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10 hours ago, doobin said:

check angles and more importantly, each flute length. 

I have always sharpened drills by eye but invariably it is getting both the cutting edges the same length that is difficult.

 

Unequal lengths cut well enough but the hole will be oversize.

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13 hours ago, doobin said:

also two nuts give you 120 degrees. 135 degrees is a more useful angle for metal work. Most quality cobalt bits come at 135 from the factory. 

Yep, the material being cut dictates the angle, for instance brass and alloy are completely different to drill..... the other most important thing is the relevant cutting compound not to mention decent HSS bits, cheers.

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All the above. Cutting n clearance angles. Cool n lube when needed. Bought myself a rotabroach mag drill n shall marry it tomorrow 😆 K

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31 minutes ago, Khriss said:

All the above. Cutting n clearance angles. Cool n lube when needed. Bought myself a rotabroach mag drill n shall marry it tomorrow 😆 K

Not much use for sub 12mm holes though 😉 or indeed for blind holes.... lathe roughing.. deep holes (oer missus

Edited by doobin
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30 minutes ago, doobin said:

Not much use for sub 12mm holes though 😉 or indeed for blind holes.... lathe roughing.. deep holes (oer missus

Nope- came with 16mm drill chuck too. Thankgod fr ebay 😊 k

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On 27/11/2019 at 07:56, carlos said:

do these work well and which ones are good as iam sick of always rooting through my drill bits looking for the least blunt ones!!

thanks carl

 

I bought a cheapy for smaller drills from screwfix and its pants, way to much slop it to accurately sharpen a drill.

 

Bob

 

:thumbdown:

 

https://media.screwfix.com/is/image//ae235?src=ae235/1566H_P&$prodImageMedium$

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