Iplayfarmer
Super Member
Yes, use the right tool for the job. I always clamp the work to the table. All ways.
Amen!
A chunk of steel stuck to a bit rotating at 400 RPM is scary.
Yes, use the right tool for the job. I always clamp the work to the table. All ways.
This link shows the RPM formula I was taught to use.
Calculating Cutting Speeds for Twist Drills
As for cutting fluids, I like to use products that were formulated for the job even if nothing more than Rigid thread cutting oil. An easy application method is to hold a small oil saturated brush against the drill bit as it rotates.
To avoid serious injury, clamp the work to the press table when using larger bits on some applications. You be the judge there.
I cant imagine a home setup, even on a good solid drill press or mill that would drill a 1" hole well at 400 rpm in steel. 100 rpm or slower works well.This link shows the RPM formula I was taught to use.
Calculating Cutting Speeds for Twist Drills
As for cutting fluids, I like to use products that were formulated for the job even if nothing more than Rigid thread cutting oil. An easy application method is to hold a small oil saturated brush against the drill bit as it rotates.
To avoid serious injury, clamp the work to the press table when using larger bits on some applications. You be the judge there.
I was just wondering how long it should take to drill a hole in 1/4". I have some harbor freight silver and deming metal bits. To cut 3/4" hole on my drill press at 300 rpm's it took about ten or more minutes each hole. Is that about right?