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Multi drill Plunge rate

7/7/15       
AA

drilling through holes for middle closet partition, and have some blows at the bottom at the other side when drill exiting material at the spoil board side.
what is the best plunge rate for 5mm brad point drill. we are not using v point.
now we have it at 5000 RPM speed and 150 plunge rate.
Thx

7/14/15       #2: Multi drill Plunge rate ...
Bob

Not a speed issue. V bits are actually called through bore bits. Brad points will always cause blow out. We use a sub that slows once the tip of the bit gets to the bottom of the board. You will need to experiment with your machine and board to balance chipout with bit life.

7/16/15       #3: Multi drill Plunge rate ...
Derrek

Website: http://closetdr.com

We have drilled millions of 5mm thru holes with brad bits on cnc. We have found you have to keep the spoilboard in good shape and only drill thru the part a couple of thousandth. When you drill thru to deep and it leaves a hole the next panel will have blowout. V bits go to deep on cnc.

7/16/15       #4: Multi drill Plunge rate ...
Bob

Thats interesting Derrek.
I have only been able to get a good results with brad points on a fresh spoilboard or or if drilling in the same spot. If the the holes end up in a kerf of a previous part I get blow out. We run nested base so we have kerfs running every which way.
We run about 30 5X sheets of closet parts a day and surface only once in the morning.

As soon as I get a chance I will try just drilling a few thousandths though. I will have to try that on one bit 1st as I have a 10 bit row of 5mm on my block. I would need to calibrate each on to get that kind of accuracy on all. Could be worth it for faster cycle times.

But then again I think I am a bit picky about my holes. I tell my customers to build for their customers not themselves all the time. I have never had a complaint on holes. Maybe I need to heed my own advise :)

Brad points are so much faster through the top for me, I would love to use them.
My current subroutine is jog to top of material slowly bore through the melamine fast though the core the slow out the bottom. It really slows my cycle times.

Anyone else having success with brad points on through bore?

7/16/15       #5: Multi drill Plunge rate ...
Derrek

We resurface .25mm at a time as needed throughout the day. That cleans everything up so we are going thru about .15mm. The cutters on the bit are 1.5 mm tall so only the very edge of tje cutter comes thru.same with all router bits.

7/16/15       #6: Multi drill Plunge rate ...
Bob

Approximately how many sheets between surface?

7/16/15       #7: Multi drill Plunge rate ...
Derrek

Between 20-40 depending on what we are running.

7/16/15       #8: Multi drill Plunge rate ...
Bob

Going to give it a try!
My block is 4K RPM what plunge rate do you suggest? Anything fancy like a slow down before going through bottom?


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