I think I have these, but not used them yet - bought them and dropped
them off at a friends place where I'm helping him with some DIY.
Note that they are for drilling wood and plastic, not metal.
[email address is not usable -- followup in the newsgroup]
Can't understand that. I regularly use Titaniium Nitride coated drills on
metals without a problem (mild steel, alloy steel, aluminium alloys, brass, cast
iron) Some are also split points, the majority of my normal HSS drills once
they need regrinding are also split points
They are usually Dormer or Guhring though and not some unknown Chinese pound
On Fri, 21 Sep 2012 12:27:44 +0100, The Other Mike
Yes, I don't know why, but I think that too. Perhaps it's just a poor
choice of name; it sounds cheap and nasty regardless of how good the
items are. That's why I was asking about them here before buying.
It would be interesting to do a comparison between Dormer etc and the Lidl
sets. The Lidl set goes from 0.5 - 10mm in 0.5mm steps, and comes in a
decent steel box. For about 6 quid. I've found them very satisfactory for
jobbing work. How much would a Dormer set cost? The odd ones I've bought
from the local tool shop are terrifyingly expensive. I really can't see
them being worth the extra.
*I went to school to become a wit, only got halfway through.
Dave Plowman firstname.lastname@example.org London SW
There are no direct Dormer equivalents in metal boxes of that range, 0.1 steps
to 6mm @ 80 quid or 0.5 steps to 13 @ 100 quid
Plastic cased 0.1 steps to 10mm are about fifty quid
As to if they are worth it. For the vast majority, no.
I'd have thought that TiN was a waste of time on wood and plastic bits.
Presumably it is *real* TiN and not the yellow fake coating which is
sometimes found on cheapies?
Real TiN makes a big difference on proper HSS bits, screwdriver bits,
etc. It is also near universal on carbide inserts used on machining centres.
On Friday, September 21, 2012 8:27:09 AM UTC+1, newshound wrote:
All I can say is I often go for cheap brands with drill bits, and have never had
a titanium coating wear off.
Cheap titanium screwdriver bits I did try once, and had poor results with, so I
don't buy those. The problem wasn't the coating, but the underlying metal giving
Thanks. That's interesting. Is it that all TiN bits that are
unsuitable for metal or just this set from CPC?
I usually use the Bosch multimaterial bits but read on the wiki how
useful TiN coated bits were and I couldn't resist a bargain ;)
says that TiN coated bits are good for aluminium, though it doesn't
mention other metals.
On Thursday, September 20, 2012 11:40:50 PM UTC+1, Dave Plowman (News) wrote:
Titanium coating gives better performance in all materials. Whether a bit's sutiable for metal depends on how its ground. Most titanium bits are regular twist drills optimised for drilling steel - which also makes them poor performers on wood, but its still the most popular bit shape for wood drilling.
On Thu, 20 Sep 2012 17:07:23 -0700 (PDT), email@example.com wrote:
I'm not familiar with all the different types of bit geometry but I
guess the "split point" bit is the key phrase here. Is that a style
optimized for wood? Perhaps the toolstatioon set is not split point,
which would explain the difference?
On Monday, September 24, 2012 8:48:11 PM UTC+1, Fred wrote:
General purpose twist drills have cutting edge angles optimised for steel. These
angles are terrible performers with wood. I regrind dead bits to make much more
aggressively angled twist drills for wood use, and the difference is like night
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