Inspired by asc2 asking on my homemade tamper instructable if my bottomless portafilter was a DIY project I grabbed a spare portafilter and headed to techshop to see if I could successfully lop the bottom off.  This is a pretty simple project if you've got access to a metal lathe.  I don't have one at home so I made it at techshop.

Step 1: Disassemble the Portafilter

Start by clamping the portafilter in a vise and unscrewing the handle.  The factory was nice enough to use loctite or something similar so it was a pain to disassemble it.  I was worried that I would ruin the handle so I brought along a rosewood handle that I made a few months ago.  I think if the plan was to keep the same handle I would clamp the body of the portafilter in the vise with a scrap of wood on each side to prevent it from getting all banged up.
Job well done, but I did not understand what good is a filter holder without the bottom. <br>Hello <br>Silver55 <br> <br>Translated from Italian by Google
Cool project Foodgeek! A couple of questions. <br>~ did the lathe chuck mare the finish on the PF? <br>~ what speed did you use to turn the bottom out? <br>~ is cutting fluid (coolant) required for making a cut like this? <br> <br>Again, great stuff!
Thanks :) <br> <br>I ended up more like gorilla tight than monkey tight with the chuck but didn't really scratch up the finish. I used something like 460rpm. I sprayed some coolant on the piece but I suspect you could get away without it. This portafilter is a big chunk of brass so it's easy to machine and it's a good heat sink.

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