core speed

RocketQ

RocketQ

It's Not Rocket Science
Silver Member
Just got gun drills to core. What rpms are you guys turning the lathe for coreing? I just did one that squealed so bad I thought I was killing a hog. I was spinning at 430 I didn't want to go much faster to keep the heat down.
 
yeah, what Craig said with emphasis on the air. some woods can be drilled faster, some slower. kinda like trial and error. :(
 
I have my air at around 15 psi and man does it make a mess.
Just didn't know if I was way off point spinnin that fast.
 
RocketQ said:
I have my air at around 15 psi and man does it make a mess.
Just didn't know if I was way off point spinnin that fast.
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Wow, 75 rpm. I run mine around 400 to 650 rpm, depending on the wood. I feed fairly slowly. To core a 13" prong takes me around 2.5 to 3 min.

Dick
 
Maybe your gun drill is not ground for wood? Play with feeds and speeds to go just below the squeak.....
 
rhncue said:
Wow, 75 rpm. I run mine around 400 to 650 rpm, depending on the wood. I feed fairly slowly. To core a 13" prong takes me around 2.5 to 3 min.

Dick
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I've found the slower speed keeps the heat down and produced the best results for me...if I ran higher I had cracking problems from heat...
 
I run mine at 1400rmp with 90 psi+ and it cuts perfect with only 10 thou run out max.But wear ear plugs and gloves.Takes less than 1 min to cut 13 inches.
 
I just bought a couple of gun drills from Sterling and these are the instructions I got from them about using the drills:

Compressors

For drills to .750+/- diameter, CFM usage could be as much as 10 - 20 continuous, so a compressor at 3 - 5 HP would be minimal. Smaller compressors should have a reasonably large holding tank and are suitable for intermittant use.

Coring

Pilot hole start to the drill diameter +.001". -0 x 1
diameter deep. Run at 1000 - 1500 rpm and 2 - 4"/minute to start. At depth, stop everything and remove the drill.

I haven't tried it coz I don't have the drills yet but I thought I'd share this with you.
 
The drill squeals at all but lower speeds like 200 it doesn't see to cut as smooth though. Guess I gotta get some carrots to shove in my ears..

Thanks guys.
 
RocketQ said:
The drill squeals at all but lower speeds like 200 it doesn't see to cut as smooth though. Guess I gotta get some carrots to shove in my ears..

Thanks guys.
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One of the first things I bought for safty was a pair of earmufflers to kill the decibles. Especially with a router, dustcollector and a lathe running at the same time.
Dave
 
i have been using the gun drill for 3 days straight and i am sick of it.anyway i run it at 700-800 rpm and some woods make alot of noise and some don't make much.first i run the .625 through and that is noisy and throws wood chips right at me,but i cover it with a rag,then bore it to .750 and it is smooth,then to .875 for the butt sleeves.the first hole is the toughest.i really couldn't imagine doing it as slow as 75 rpm.seems like it would take forever.
 
http://www.sterlinggundrills.com/
Call them and tell them what you are using it for. They will grind it with the proper angles. You might consider having them make it a little oversized as well, so that cores can be cleaned up and used as tenons for .750 or .625 tubing.
They've been discussed quite a bit, do a search in the ask the cuemaker forum and you will see lots of info.
This thread is quite good: http://forums.azbilliards.com/showthread.php?t=15599
 
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I run around 700 - 900rpm and feed 18inches in aprox 30sec - 1 minute. I get some noise on occasion but I am usally wearing ear plugs anyway so I don't notice. I had my drill custom made and it is setup to throw the chips twards the wall behind the lathe, away from me. The only wood I have ever had problems with are snakewood (big shocker there LOL) and palm woods. Chris.
 
Chris Byrne said:
I run around 700 - 900rpm and feed 18inches in aprox 30sec - 1 minute. I get some noise on occasion but I am usally wearing ear plugs anyway so I don't notice. I had my drill custom made and it is setup to throw the chips twards the wall behind the lathe, away from me. The only wood I have ever had problems with are snakewood (big shocker there LOL) and palm woods. Chris.
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Mine is mounted in a 1" quick change boring bar holder so I can mount in any direction I want and I have so that all of the dust/chips go down through the bed to the pan.

Dick
 
masonh said:
i have been using the gun drill for 3 days straight and i am sick of it.anyway i run it at 700-800 rpm and some woods make alot of noise and some don't make much.first i run the .625 through and that is noisy and throws wood chips right at me,but i cover it with a rag,then bore it to .750 and it is smooth,then to .875 for the butt sleeves.the first hole is the toughest.i really couldn't imagine doing it as slow as 75 rpm.seems like it would take forever.
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It doesn't take too long to go through a 13 in. + piece...I have a 2 hp motor that grunts through anything...just aim the groove down or back and chips aren't a problem...
 
Dick the quick change is the way to go. I couldn't imagine trying to do that with the tail stock. Auto feed constant pressure cover the fan on the motor.
 
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