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  The Woodturning Forum - Woodturner's Resource › Woodturning Forum › Turning Talk › Turning Large Bowl Blanks
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Turning Large Bowl Blanks (Read 740 times)
Richard Wilabee
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Turning Large Bowl Blanks
06/24/12 at 16:14:12  
What is the best speed to turn 14" to 16" x 3" to 4" bowl blanks that have been cut round on the bandsaw.

Rich
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JimQuarles
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Re: Turning Large Bowl Blanks
Reply #1 - 06/24/12 at 16:23:39  
The rule of thumb is Diameter (in inches) X RPM = 6000 - 9000

Therefore 15" is considered safe at 400 - 600  RPM.

I think it was Dale Nish that finally wrote it down.
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Roger Turnbough
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Re: Turning Large Bowl Blanks
Reply #2 - 06/24/12 at 16:54:43  
Rich,

I wouldnt start off at that speed, but rather,  start slow, and advance the speed slowly until the piece gets into the range.  Often times, I will speed it up until the lathe vibrates, then back the speed off a touch to stabilize the lathe and piece.  Once the piece is more trued up, you can advance the speed more into the preferred range.  Work safe, and stay out of the line of fire.

Roger
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Bernie Weishapl
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Re: Turning Large Bowl Blanks
Reply #3 - 06/24/12 at 19:01:14  
When I have a 13" to 16" bowl blank on my lathe like Roger I start out slowly. I start at 250 rpm when I begin roughing. I will crank the speed up as the blank get round and begins to take shape. When it has the shape I want I will speed it up more. When doing the inside of that same bowl I will often run the speed at 750 to 800 rpm.
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Re: Turning Large Bowl Blanks
Reply #4 - 06/25/12 at 00:51:54  
Ditto on what they said.
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Re: Turning Large Bowl Blanks
Reply #5 - 06/25/12 at 12:16:31  
What they said.  With time and experience you will be able and will want to speed things up a bit.  But starting any piece slow and increasing the speed as it gets round and balanced is always a good idea.  I'm turning faster now than I ever have.  May not be long till I'm turning as fast as Reed does on his videos.  We'll have to see how long it really takes.  But the point is, the more you turn, the faster you will feel comfortable turning.  Enjoy the process and don't worry too much about the speed.  If it gets to feeling too fast, back it off.  If it feels too slow, speed 'er up.  Pucker factor is a good thing to monitor.
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Re: Turning Large Bowl Blanks
Reply #6 - 06/25/12 at 23:36:39  
I have been forced to learn that slower is faster a lot of the time.  Just because the lathe will turn at 3000 rpm doesn't mean it has to.
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