Crowndroyal
Plastic
- Joined
- Jun 3, 2019
- Location
- Sarnia
Looking for advice or options for drilling on forged 317.
Blueprint says SA 182 317/317L
Material is 205mm thick hole size is 25.6 mm, using an intimidator 120.
Material has been machined down from raw forge and set up on four blocks and clamped down in a x pattern. Blocks are about 2 inches tall roughly 1600 holes.
Have 2 different drilling tools
KSEM1000R10SS125 DRILL BODY
KSEM1011SPL INSERT
Currently drilling the Kenna at 700 rpm at 51mm/min
Center of the insert breaks off around 20 to 30 holes sometimes only get 3 holes before it breaks.
Hole size was also an issue when changing feeds and speeds ( can't remember off hand what numbers were tried )
Coolant pressure is around 500 to 530 at about 3 to 4 gpm
ISCAR ICM 1012 IC908 with matching size drill body
Currently drilling this setup at 500 rpm 90 mm/min get about 30 holes on insert before go/no go gauge gets tight. Also getting crunch noises once in awhile which im assuming are just chips not clearing tried higher rpm lower feed but hole size was all over and swirls on finish.
Coolant pressure is 500 psi with 4.9gpm
Oh holes are also being spot drilled to 5.08 mm depth on both setups. The iscar also tends to rub edges of spot before entering hole.
Need any other info just ask csnt thinknof what else would be needed at time of posting
So question is what feeds and speeds or procedure would be recommended
Blueprint says SA 182 317/317L
Material is 205mm thick hole size is 25.6 mm, using an intimidator 120.
Material has been machined down from raw forge and set up on four blocks and clamped down in a x pattern. Blocks are about 2 inches tall roughly 1600 holes.
Have 2 different drilling tools
KSEM1000R10SS125 DRILL BODY
KSEM1011SPL INSERT
Currently drilling the Kenna at 700 rpm at 51mm/min
Center of the insert breaks off around 20 to 30 holes sometimes only get 3 holes before it breaks.
Hole size was also an issue when changing feeds and speeds ( can't remember off hand what numbers were tried )
Coolant pressure is around 500 to 530 at about 3 to 4 gpm
ISCAR ICM 1012 IC908 with matching size drill body
Currently drilling this setup at 500 rpm 90 mm/min get about 30 holes on insert before go/no go gauge gets tight. Also getting crunch noises once in awhile which im assuming are just chips not clearing tried higher rpm lower feed but hole size was all over and swirls on finish.
Coolant pressure is 500 psi with 4.9gpm
Oh holes are also being spot drilled to 5.08 mm depth on both setups. The iscar also tends to rub edges of spot before entering hole.
Need any other info just ask csnt thinknof what else would be needed at time of posting
So question is what feeds and speeds or procedure would be recommended