I've just knackered a £12 sds drill bit after one session, cutting a
big hole in a wall for a wc waste,
Usually, I dip a bit in cold water occasionally in such circumstances,
but i got lazy and was impressed the way that SDS bits are slow to get
hot.

Anyway
Tips on sharpening drill bits generally? angle, ordinary hammer, SDS
Many of the sds bits have a sort of nipple on the end, almost a bell
or bobble hat shape - is that important ?
I generally try and sharpen things dangerously with an angle grinder -
a stone takes forever.
Can I maybe buy a bit sharpening machine?


Where do I find the FAQ - I ought to know the address by heart.
Thanks

Sony

SDS - I bought a cordless P drill from B&Q. £50. It is quiet,
determined, very good. The disadvantage is that the new battery lasts
for about one 20 minute job. This worries me that after a few months,
the batteries will need changing ever five minutes. So perhaps corded
is better.
Nevertheless, really good at the price, and a good intro to SDS which
I must thank this group for telling me about recently.

In article
,
tonyjeffs wrote:
Tips on sharpening drill bits generally? angle, ordinary hammer, SDS
Many of the sds bits have a sort of nipple on the end, almost a bell
or bobble hat shape - is that important ?
I generally try and sharpen things dangerously with an angle grinder -
a stone takes forever.

Can I maybe buy a bit sharpening machine?

They can be useful for larger sizes - but most can only cope with up to
about 12mm. However you could use the grinding wheel part and do it
freehand.


Where do I find the FAQ - I ought to know the address by heart.
Thanks

Sony

SDS - I bought a cordless P drill from B&Q. £50. It is quiet,
determined, very good. The disadvantage is that the new battery lasts
for about one 20 minute job. This worries me that after a few months,
the batteries will need changing ever five minutes. So perhaps corded
is better.
Nevertheless, really good at the price, and a good intro to SDS which
I must thank this group for telling me about recently.

Fact of life with any power hungry tool. The same applies to circular
saws. Cordless versions are only really worthwhile if you have no mains
available - or where it would be inconvenient to run it. With SDS such a
thing might be fitting satellite dishes for a living. For most DIY mains
is better.

--
*I was once a millionaire but my mom gave away my baseball cards

Dave Plowman London SW
To e-mail, change noise into sound.

On Sun, 23 Nov 2008 01:37:25 -0800 (PST), tonyjeffs wrote:

I've just knackered a £12 sds drill bit after one session, cutting a
big hole in a wall for a wc waste,

Sounds like you are using a bad technique or you where drilling something
*very* hard. You don't need to push hard on an SDS drill like you do with
an ordinary hammer drill. Push enough to stop the bit from chattering
round or in the chuck but there is no need to lean on it. The cutting come
from the heft impacts that the SDS mechanism delivers.

Usually, I dip a bit in cold water occasionally in such circumstances,
but i got lazy and was impressed the way that SDS bits are slow to get
hot.

I wouldn't do that to any drill, heaven knows what the thermal shock will
do to the tempering...
Many of the sds bits have a sort of nipple on the end, almost a bell
or bobble hat shape - is that important ?

Mine don't, at least not that I have noticed. They all seem broadly like
the ends of two cold chisels joined at an angle.

Can I maybe buy a bit sharpening machine?

Martek, if it's still about, for small HSS and ordinary masonary drill
with the correct stone.

--
Cheers
Dave.

tonyjeffs wrote:
I've just knackered a £12 sds drill bit after one session, cutting a
big hole in a wall for a wc waste,
Usually, I dip a bit in cold water occasionally in such circumstances,
but i got lazy and was impressed the way that SDS bits are slow to get
hot.

I'd take the bit back & whinge if I were you, even a cheapo should last one
hole.

Anyway
Tips on sharpening drill bits generally? angle, ordinary hammer, SDS
Many of the sds bits have a sort of nipple on the end, almost a bell
or bobble hat shape - is that important ?
I generally try and sharpen things dangerously with an angle grinder -
a stone takes forever.
Can I maybe buy a bit sharpening machine?

I can't be arsed to sharped drill bits, a new bit costs less than the time
it takes to sharpen it.

SDS - I bought a cordless P drill from B&Q. £50. It is quiet,
determined, very good. The disadvantage is that the new battery lasts
for about one 20 minute job. This worries me that after a few months,
the batteries will need changing ever five minutes. So perhaps corded
is better.

£50 is cheap for a cordless combi drill. I think you got what you paid for.
When you pay the extra for DeWalt/Makita/Bosch you get much better quality
batteries & chargers.


--
Dave - The Medway Handyman
www.medwayhandyman.co.uk

tonyjeffs wrote:
I've just knackered a �12 sds drill bit after one session, cutting a
big hole in a wall for a wc waste,
Usually, I dip a bit in cold water occasionally in such circumstances,
but i got lazy and was impressed the way that SDS bits are slow to get
hot.

Anyway
Tips on sharpening drill bits generally? angle, ordinary hammer, SDS

bench grinder best, angle grinder can also be used if you go easy and
give it plenty of time to cool between short sharpenings.


Many of the sds bits have a sort of nipple on the end, almost a bell
or bobble hat shape - is that important ?
I generally try and sharpen things dangerously with an angle grinder -
a stone takes forever.
Can I maybe buy a bit sharpening machine?


Where do I find the FAQ - I ought to know the address by heart.
Thanks

Sony

SDS - I bought a cordless P drill from B&Q. �50. It is quiet,
determined, very good. The disadvantage is that the new battery lasts
for about one 20 minute job. This worries me that after a few months,
the batteries will need changing ever five minutes. So perhaps corded
is better.

Either its carp or you were pushing it much too hard. You should get
far more use time out of a mcuh cheaper tool than that.


Nevertheless, really good at the price, and a good intro to SDS which
I must thank this group for telling me about recently.

For drilling wood the following bits use far less energy per hole:
http://www.wiki.diyfaq.org.uk/index....twist_drill s


NT

"tonyjeffs" wrote in message
...
I've just knackered a £12 sds drill bit after one session, cutting a
big hole in a wall for a wc waste,
Usually, I dip a bit in cold water occasionally in such circumstances,
but i got lazy and was impressed the way that SDS bits are slow to get
hot.

Anyway
Tips on sharpening drill bits generally? angle, ordinary hammer, SDS
Many of the sds bits have a sort of nipple on the end, almost a bell
or bobble hat shape - is that important ?
I generally try and sharpen things dangerously with an angle grinder -
a stone takes forever.
Can I maybe buy a bit sharpening machine?


Where do I find the FAQ - I ought to know the address by heart.
Thanks


Green Grit wheel or a diamond wheel made for the purpose.

http://tinyurl.com/5svmdo

Used on a proper bench grinder.
Gentle and slow sharpening with LOTS of dipping in water (Shock to carbide
will be insignificant) to prevent the braize from releasing the tips.
*Never* grind the sides of the carbide.
Follow the original shape if there's any left. If not then the front edge
grind back at the regular 59 deg angle from centreline (Much the same angle
as a normal drill) and just take off the front leading edge face by about 1
to 2mm to give the drill a negative approach. Take care to keep both lands
equal or it will lead off from centreline when in use

I used to "refurbish" SDS and other drills in the same way while in plant
hire and they worked fine.

Thanks for the tips.
Might've misrepresented my use of the drill bit. I used it to cut out
a 4" dia hole by drilling at half inch spaces around the edge through
pressed engineering brick, so it did take a beating, and I know now
that i was pushing too hard.

............

I needed exactly 6 x 3m lengths of copper pipe B&Q £39.
But a pack of 10 is £40 so I got that instead. I'll leave the four
spare on the garage roof for a few years until they're corroded enough
to bin. ;-)

tonyjeffs wrote:
Thanks for the tips.
Might've misrepresented my use of the drill bit. I used it to cut out
a 4" dia hole by drilling at half inch spaces around the edge through
pressed engineering brick, so it did take a beating, and I know now
that i was pushing too hard.

For hard work use corded. More power & endless capacity


NT