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Re: Pin drills
Posted: Wed Jan 20, 2016 3:29 pm
by 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.
Re: Pin drills
Posted: Wed Jan 20, 2016 3:50 pm
by 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
Re: Pin drills
Posted: Wed Jan 20, 2016 6:45 pm
by 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
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
Re: Pin drills
Posted: Wed Jan 20, 2016 6:56 pm
by ALPHA
This type is just O k ...never had much luck with them...they always break after the taper
ALPHA
Re: Pin drills
Posted: Wed Jan 20, 2016 7:58 pm
by 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.
Re: Pin drills
Posted: Wed Jan 20, 2016 8:03 pm
by 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
Re: Pin drills
Posted: Wed Jan 20, 2016 8:23 pm
by jarndice
AL the TAMIYA pin vise has a 1/4" hex head socket just built for 1/4" hex headed drill bits.
shaun.
Re: Pin drills
Posted: Wed Jan 20, 2016 8:51 pm
by AlwynTurner
That's great Shaun, must look out for one. Thanks
Alwyn
Re: Pin drills
Posted: Wed Jan 20, 2016 9:24 pm
by ALPHA
RobW wrote: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
Re: Pin drills
Posted: Wed Jan 20, 2016 9:26 pm
by ALPHA
jarndice wrote: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
