Technical, Techniques, Hints, and Tips > Modelling tools

Small size drill set

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Plastic - RIP:

--- Quote from: John R Haynes on January 16, 2021, 10:10:52 am ---I bought this set of drills in the case and when tried to use some found that all the drill ends were cut square and blunt ie not tapered to a point therefore making them unusable and a waste of money . Anybody else had the same experience ?

--- End quote ---
I find that a lot with cheap small diameter drills - anything up to about 1.5mm is hit or miss about the centring of the cutting point and the symmetry of the ground angles - almost like their smallest collet is 2mm so they hold them by hand on the grinder.    %)

Taranis:
The amazon description says they are for wood and plastic, not suitable for drilling hard materials.
Unless this is a different item?

https://www.amazon.co.uk/HPMAISON-0-4mm-3-2mm-Drilling-Helicoidal-Plastic/dp/B08HN2HHY9/ref=sr_1_12?crid=28DZ6XTQSLFCJ&dchild=1&keywords=twist+drills+sets&qid=1610795621&sprefix=twist+dr%2Caps%2C157&sr=8-12

grendel:
for metal cutting I buy the carbide pcb drills, they break very easily, but are the only thing I have found to drill very small (0.7mm) holes through stainless steel
https://www.amazon.co.uk/Useful-Print-Circuit-Board-Carbide/dp/B00K74HUSO
but be warned, they break if you look at them too hard, expecially the smaller sizes, i usually break them putting the drill down, not a drill bit to use if you dont have very steady hands

TailUK:
For sub 1mm sizes, guitar strings are useful.  Available in several sizes a single string will keep you in short lengths for months.

roycv:
Hi I had not thought of guitar strings.  The drills in my set go down to 0.1mm just don't drop one!  A friend told me that if you file a part taper onto the last 4 or 5 mm of a length of piano wire you can use that as a  drill.  I have tried it and it works well.
Regards
Roy

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