I am running a family of parts on my CNC , lathe , and the customer has chisled me down in price as low as I can go . The only way I can get a raise is to make them faster .
The initial drilling op is consuming way too much time , so I am considering changing from a HS split point stub drill to a solid carbide . My tool catalogue states "live tooling reccomended for lathe applications "
when I am looking at 1/2" 7/16" drills . I suspect that my machine wont get the RPM needed to utilize these drills to their potential .
Max RPM is 3,000. So perhaps I need to back up and see if I can get better performance from what I am using now . Deferring to another thread on carbide insert drills , I have read the tutorial on drill tip geometries , and 4 and 6 facet drill tips .
I am able to produce pretty consistant split points in house , using a Darex sharpener , but it seems this geometry can be refined further .
Here are the parameters I am currently running on off the shelf HS stub drills that I have split in shop :
ON 1018 CR steel : 1/2" drill , 800 rpm , .005" ipr, peck drill . drilling to .6 depth . ( spot drill , tl chg /drill/tl chg = 24 seconds ).
Is there much to be gained by changing to different tip geometries , cobalt , or coated drills .
Switching to carbide may prove to be an expensive experiment . I'd need 2 of each size ( one to send to the sharpener )
24 seconds is an eternity . Nothing I can do about the tool chg time .
How did the old school screw machines get maximum production from the old tooling ?
Why is every cobalt drill I buy , made with such a thick web ?
Thanks
FBBob
The initial drilling op is consuming way too much time , so I am considering changing from a HS split point stub drill to a solid carbide . My tool catalogue states "live tooling reccomended for lathe applications "
when I am looking at 1/2" 7/16" drills . I suspect that my machine wont get the RPM needed to utilize these drills to their potential .
Max RPM is 3,000. So perhaps I need to back up and see if I can get better performance from what I am using now . Deferring to another thread on carbide insert drills , I have read the tutorial on drill tip geometries , and 4 and 6 facet drill tips .
I am able to produce pretty consistant split points in house , using a Darex sharpener , but it seems this geometry can be refined further .
Here are the parameters I am currently running on off the shelf HS stub drills that I have split in shop :
ON 1018 CR steel : 1/2" drill , 800 rpm , .005" ipr, peck drill . drilling to .6 depth . ( spot drill , tl chg /drill/tl chg = 24 seconds ).
Is there much to be gained by changing to different tip geometries , cobalt , or coated drills .
Switching to carbide may prove to be an expensive experiment . I'd need 2 of each size ( one to send to the sharpener )
24 seconds is an eternity . Nothing I can do about the tool chg time .
How did the old school screw machines get maximum production from the old tooling ?
Why is every cobalt drill I buy , made with such a thick web ?
Thanks
FBBob