Pin drills

[jarndice]

GARY Hi, One thing I would say about using COBOLT TIPPED Drill Bits is you really must not let the tip overheat so a constant use of a thin oil is vital on the bit while drilling,
Like you I would not use anything else but you must be prepared for the extra cost.
Shaun.

[AlwynTurner]

I also use these as they have the handy hex bit to grip, plus you can use them in a hex bit screwdriver. I often need to drill out larger holes and these are perfect and titanium coated too.
http://www.ebay.co.uk/itm/311441018641? ... EBIDX%3AIT
With sizes from 1.5mm up to 6.5mm they are really handy
Alwyn

[ALPHA]

MAN ...what are you all drilling??????????? ....I generally drill plastic...have had a set of Squadron bits for decades...and I only broke one of those...Heat is definitely your enemy...bits this tiny are susceptible no matter what they are made of...they can loose their temper in seconds...reason why manual pin vises are good

Spoiler: show

MADE BY MICROMARK...the smallest bit is the one that broke...and that was because I chucked it in a power drill

Now if you are drilling stainless or titanium then you are talking a different story...but I don't know of any RC tank made of that stuff yet

ALPHA

[ALPHA]

This type is just O k ...never had much luck with them...they always break after the taper

Spoiler: show

they actually work better after the tip breaks off..then you can chuck it at the tip ...there is too much flex in the small part of the bit where the cutting edges are ...the thick shaft is strong yes...but it's useless once the cutting edges are gone ...unless you are just going to use that part to jab someone out of frustration

ALPHA

[RobW]

Use to break 3mm masonry bits all the time at my old house. They built a load of Sheffield terraces with blue (engineering) brick.

[AlwynTurner]

I just use those bits because of the hex shaft - it makes them easier to grip like a pin vice. I always work with styrene but sometimes need to drill larger holes than a pin vice can normally handle. Alwyn

[jarndice]

AL the TAMIYA pin vise has a 1/4" hex head socket just built for 1/4" hex headed drill bits.
shaun.

[AlwynTurner]

That's great Shaun, must look out for one. Thanks Alwyn

[ALPHA]

Use to break 3mm masonry bits all the time at my old house. They built a load of Sheffield terraces with blue (engineering) brick.

...So what are we talking here....You going to drill holes in your model or cement ...Cause that set you're asking about will never go through cement ..they are made for plastic...and will probably serve you well so long you don't put pressure on them like you are drilling cement


ALPHA

[ALPHA]

AL the TAMIYA pin vise has a 1/4" hex head socket just built for 1/4" hex headed drill bits.
shaun.

Think you know how I feel about Tamiya's pin vise Wo1c.... we've spoken about this before...the one thing it doesn't have and should...is a rotating finger grip like the one Rob is looking at


ALPHA