Huston we have a problem ......

[DAPPH]

" Huston we have a problem "
The hex driving sleeve on the 6.5 mm quick change twist drill has simply slid off leaving the drill some 50 mm in a block of Delrin ( *@^%$£! )
It's not the first failure I had with these Chinese cheap drills which is a pity as they are usefull and you rarely ever have the drill coming loose in the god awful hand chucks. Does any one know if you can get proper forged hex drills instead of the sleeve being pressed on the drill and crushed in to the locating the slot in the drill shank .

I've got some brand name " Faithful " masonry hex drive drills and they are fully forged with tungsten tips fused in ends of each drill .

If you know where these fully forged drills can be had 1 t0 8 mm in half mm increments can you PM me or add the info to the thread

Thanks
Dave

 

[frank horton]

very interesting......
prob gotta start looking in the US first......
would have thought a product from Germany or Sweden most likely......
wishI could retro fit decent hand chucks to my drills......

I have a decent set of drills that I milled flats on the shanks to ease the spinning prob but can only go down to 5mm.....

 

[cheb]

I've a set made by Fischer and bought from Axminster a long time ago. I was looking to replace them recently and they don't seem to be listed any more. They are stub drills so quite short. Bosch multipurpose are a possibility.

 

[Agroshield]

It would be possible to buy standard twist drills and grind three flats on them (using a jig so the flats are even) if the chuck does not work properly.

 

[brewdexta]

Star Japan, Famag and Colt all make quality hex shank drills but mainly for wood although Colt make them for plastics too, drilling pen blanks etc.

 

[not done it yet]

It would be possible to buy standard twist drills and grind three flats on them (using a jig so the flats are even) if the chuck does not work properly.

Plenty (I think) of drills made with three flats on the shanks, on the market - you generally only need three glats for a standard drill chuck, after all. It’s only usually screwdriver tips that are hex drive? These are the first small drills I have seen like this.

I somehow doubt their accuracy, but close enough, I suppose. If I want precision it is in the lathe or on the mill - with a collet chuck of one description or another.

Masonry drills will likely get used in ‘percussion’ mode, so would soon loosen/destroy that method of clamping on a sleeve.

My last comment is ‘buy cheap, buy twice’, so expect failures.

 

[DAPPH]

I've a set made by Fischer and bought from Axminster a long time ago. I was looking to replace them recently and they don't seem to be listed any more. They are stub drills so quite short. Bosch multipurpose are a possibility.

Thanks Cheb , I searched for something slightly different and these came up on the Axminister site ........... axminstertools.com/fisch-universal-twist-drill-hex-shank-3-mm-107403

 

[sparkysy]

I have an awesome set from Screwfix that I bought about two years ago, 3 of each different sizes and half sizes too up to 6mm. Not one that has slipped from its hex collar! They stopped doing them unfortunately and can't find the same set anywhere online
A friend uses these and says they are excellent but a hefty price and not all the half sizes included in the set.

Milwaukee Hex Shank RedHex HSS Metal Drill Bit Set 19 Piece Set - Screwfix

Order online at Screwfix.com. Shockwave impact duty titanium drill bits are engineered for impacts and drills. Designed with a variable helix with a 35° cutting edge that ends at 15°. Provides rapid chip removal to limit heat build-up and stay sharper longer. Split point tip delivers a precision...

www.screwfix.com

 

[Shiny Steve]

I have that Milwaukee set and they are fairly decent. Good for wood, ok for metal.

 

[not done it yet]

A friend uses these and says they are excellent but a hefty price and not all the half sizes included in the set.

According to the advert, all the half sizes appear to be there?

 

[sparkysy]

Doh! That will teach me to read the spec properly!!