Homebrew PCBs

Now that makes me wonder, as there are recommend speed rates for cutting 
materials.

I can drill acrylic plastics with a 1/4" drill and at very different rpm 
than nickel, which is at a very different rpm than brass, again, a 
different speed than mild steel.
Change the bit size more than 10% in either direction and usually the 
speeds for all will need to change again.
It can be rather a PITA when doing a number of different sized holes in 
one material.

What are the correct rpms for through drilling "virgin" boards and 
different dia holes?



On 12/24/2012 2:43 AM, jeremy youngs wrote:
> also to note when producing boards one is usually using a high speed
> spindle and turning 15000 or more rpm
>
> On Sun, Dec 23, 2012 at 7:43 PM, AlienRelics <alienrelics@...> wrote:
>
>> **
>>
>>
>> Widening a hole is asking a lot less than drilling a hole where none
>> exists.
>>
>> Steve Greenfield AE7HD
>>
>> --- In Homebrew_PCBs@yahoogroups.com, Corey Minion <csminion@...> wrote:
>>> Odd, I have drilled out hundreds if not thousands of undersized holes in
>>> boards (down to my last 25 boards after 3 years)
>>> It was my first pcb design and I screwed that up, never occurred to me
>>> that there were different sized leads on that first one.
>>> Anyone lubing there bits and tools prior to cutting?
>>> Also, are you use some sort of cooling?
>>> I use compressed air when working on boards.
>>>
>>> I have used 2 HSS bits over all that time, never noticed them dull much
>>> more than any tool I may work with on polycarb or acrylic.
>>> I find it dulls far less than working on ferrous metals, and less than
>>> non-ferrous as well.
>>>
>>> I am a college and real world trained silver(metal)smith since 89.
>>> I have always been really conscious of tool sharpness
>>>
>>> Worst material I have found so far to work with, industrial ceramics.
>>> EATS tools. nam nam nam.
>>>
>>   
>>
>
>