Peck driling on spade drill?

[cijunet]

Hi,
I have to drill on a CNC lathe a 1" dia. 13" long hole in stainless steel using a spade drill. Should I go with peck drilling, or just keep drilling straight to the bottom?
Thanks

[djr76]

If it has through coolant, I would just keep it going through solid all the way. If chips start packing, then yeah, might have to peck it.

[star-turn]

are you using something like the Allied max cut drill with carbide insert (tip) or HSS ??

if using the the former go all the way - no pecks - if using HSS them peck once every inch of depth

ST

[Delw]

to break the chip you might just want to use like a 1-2 turn pause/dwell ( depending on the stainless) use the fastest dwell you can basically like every 2-4 inches. use this only if your not getting good chips, feeds and speeds are important on long drilling. If your getting good chips out ot the drill leave it alone.
I wouldnt peck drill it with a spade drill as it will cause chatter and your drill might walk off.

[cijunet]

Thank you guys for the tips!