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Espresso: General Discussion
How I made my Bottomless PF

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DigMe
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Posted Sun Dec 31, 2006, 4:31pm Subject: How I made my Bottomless PF

Inspired by lyketalurn's thread I thought I'd post my process of going bottomless in pictures. I didn't actually take the pics as I did it but kind of recreated it so that you get the idea. The items needed are: - a 2 3/8" hole saw drill bit and mandrel (the part that you attach the bit to). make sure the hole saw bit is rated for cutting metal. Some are only for wood, such as ones that are made for installing deadbolts in doors. -a drill -a file -sand paper -Eye protection Here's what you will end up with: (Click for larger image)

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DigMe
Senior Member

Posted Sun Dec 31, 2006, 4:32pm Subject: Re: How I made my Bottomless PF

Here's the hole saw bit mounted on my drill: (Click for larger image)

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DigMe
Senior Member

Posted Sun Dec 31, 2006, 4:33pm Subject: Re: How I made my Bottomless PF

As you can see the mandrel (what you attach the bit to that holds it onto the drill) is the type that has a smaller drill bit in the center. This was somewhat helpful for lining up the drill bit but not necessary as the 2 3/8" bit is such a good fit that it mostly probably would have lined itself up anyway. Here's a closer look at the pilot bit that is attached to the mandrel: (Click for larger image)

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DigMe
Senior Member

Posted Sun Dec 31, 2006, 4:35pm Subject: Re: How I made my Bottomless PF

I mounted the PF in a bench vise for the drilling but you could do without if you don't have one. Just use one hand to brace the PF and the other to drill. Vise makes it easier though! Here's what it will look like when you're drilling: (Click for larger image)

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DigMe
Senior Member

Posted Sun Dec 31, 2006, 4:37pm Subject: Re: How I made my Bottomless PF

Wear eye protection. Try and keep the drill straight up and down with some downward pressure on it as you drill. If you don't put pressure on the drill it can move around or possibly kick out and it you won't get anywhere. Here's a closer look at the bit in the PF: (Click for larger image)

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DigMe
Senior Member

Posted Sun Dec 31, 2006, 4:39pm Subject: Re: How I made my Bottomless PF

The danger of just drilling and doing nothing else would be sharp edges that can cut hands. You need to make those edges dull by rounding and/or flattening them. I used a file first. Round for the inside: (Click for larger image)

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DigMe
Senior Member

Posted Sun Dec 31, 2006, 4:40pm Subject: Re: How I made my Bottomless PF

and then a flat file all across the top: (Click for larger image)

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DigMe
Senior Member

Posted Sun Dec 31, 2006, 4:42pm Subject: Re: How I made my Bottomless PF

I finished up with sand paper to get a little finer finish. I kind of wrapped the paper around the rounded side of the file to brace it: (Click for larger image)

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DigMe
Senior Member

Posted Sun Dec 31, 2006, 4:43pm Subject: Re: How I made my Bottomless PF

I'll finish with more views of the finished product: (Click for larger image)

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DigMe
Senior Member

Posted Sun Dec 31, 2006, 4:43pm Subject: Re: How I made my Bottomless PF

a little bit more inside: (Click for larger image)

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