Removing conversion ring from Bunnzilla Ditting burr

Equipment doesn't work? Troubleshooting? If you're handy, members can help.

Postby nnmlrl » Jul 04, 2018, 12:16 pm

Does anyone have any experience or advice on how to remove the press fit conversion ring of a Bunnzilla ditting burr from Mill City? I started my Bunnzilla project a few weeks ago. While I was waiting for the Bunnzilla burr to arrive from Mill City, a local cafe closed down and I got a Ditting KR804 from them. I am thinking to remove the ring so that I can use it on the KR804 later. I only have some primitive tools so I am not sure if that will be easy.

Any advice or suggestions will be greatly appreciated.


Postby ira » Jul 04, 2018, 4:35 pm

I assume the ring is aluminium, place the burr on a cup in a 200 degree oven and it might just fall off. Carefully heating the ring with a heat gun or small torch might also do the same thing. be careful not to get the burr too hot.



Postby OldNuc » Jul 04, 2018, 7:50 pm

Heat the aluminum ring and it will fall off. Heat gun works best for this.


Postby nnmlrl » Jul 05, 2018, 8:56 am

Oh that sounds easy :) Let me try this weekend.Thank you ira and OldNuc.


Postby OldNuc » Jul 05, 2018, 9:54 am

The trick is to heat the ring fast enough while the steel is still cool. It is not real hard to pull off with a good heat gun, a torch will not work as well as even heating is much more difficult. You want the ring to expand evenly, not egg shaped.


Postby nnmlrl » Jul 12, 2018, 11:18 am

I tried a couple of times with the heat gun's nozzle pointing at the ring, but the ring stayed. I tried different speeds of circulating around the ring. It looked like no matter what I did, the steel burr still heated up very quickly... Perhaps I was heating it for too long.


Postby ncrc51 » Jul 12, 2018, 12:15 pm

No experience with this particular situation but some with other machinery. A heat shield over the steel part while using the heat gun might do the trick. Shield could be heat tolerant gasket material or due to the lower temps something like heavy gauge aluminum foil may work.


Postby nnmlrl » Jul 15, 2018, 4:51 am

Thanks for the suggestion every one. I decided to sell the burrs with the conversion ring attached to fund my other projects.