You don't use a spiral point tap in blind holes, you use a spiral flute tap.

JT

On 11/3/2013 8:20 AM, ed wrote:
> John Thornton wrote:
>> You only peck tap when doing it by hand. When you machine tap you always
>> go all the way in and back out. It is wise to use good quality taps and
>> inspect the first few cutting edges with a strong glass before use to
>> look for signs of wear like cupping.
>>
>> JT
>>    
> The type of tap is critical here. A regular hand tap needs to be
> reversed often. A spiral point tap can go through in one pass. Once in a
> while it is necessary to peck with a spiral point but that is a special
> case, mostly in blind holes. I would simply rerun the program after
> cleaning out the hole and tapping to a deeper Z depth.
>
> Ed.
>
>
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developers love is also attractive to malware creators. Download this white
paper to learn more about secure code signing practices that can help keep
Android apps secure.
http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clktrk
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