There are many ways to mount bowls blanks to a lathe. Some turners use faceplates and some will rough out blanks between centers. I know of one turner who roughs out bowls using a big pin chuck. I've tried all these methods and they all work well.
I developed this method because I core all my blanks, even if I don't plan on using the core. I wanted a way that I can quickly and easily remount a blank from both sides. Here is my method for mounting bowl blanks on the lathe.
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When I round my blanks, I use cardboard circle templates. In the center of each template there is a hole where I placed a stick pin to hold the template in place. If I don't have a template the right size, I'll use either a big compass or make a new template.
In this case I used a large compass so I can decide where I wanted my center. I marked the circumference then bandsawed along the pencil mark.
Next, I use a spring loaded center punch to enlarge the hole. Since the hole is a little hard to see in the photo, I placed a chalk mark for clarification.
(This is the inside of the bowl)
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Here I'm using a speed square to help me eyeball a straight hole. I'm using a 2-1/8" forstner bit mounted in a hand drill.
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I drill to a depth of about 3/8"
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I place a chuck with a set of #2 jaws into the hole.
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Here is the bowl mounted on the lathe and now I get the chance to try out the new home I gave my Thompson bowl gouge.
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Outside all roughed out along with a 2" tenon
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I reversed the bowl and will proceed to core out the center. Once I pop out the center I will flip the core and mount it again using the hole I first drilled. I will turn a new tenon and repeat the process again.
I was able to get three bowl blanks from this piece and the whole process described here took around one hour.