trying to bolean cut a adapter from 51.5 mm base to 49 mm base

[pharmacist]

I am trying to decrease the base lower (diameter 51.5 mm) into 49 mm with the bolean cut method in Blender, but I have tried several times to do it but it did not managed to decrease the radius of the broad base from 51.5 m to 49 mm base. I tried to decrease the whole from 51.5 to 49 mm, but then the screw area will decrease in radius too, making it very loose in the adapter.

When i generate a cylinder with internal cylinder size of 24.5 mm to cut the rim of the adapter foot (lower broad ring) to 49 mm the upper area is cut too, making it useless.

Can someone help me with it ?

 

[Epatcola]

Just the bottom part reduced to 49mm outside diameter?

 

[pharmacist]

Many thanks for your efforts....I will give it a try, because I have a particular T ring that internall is only 49 instead of the 51.5 mm diameter.

 

[pharmacist]

It works thousand times thanks

!!!

 

[Epatcola]

It works thousand times thanks!!!

You are welcome. Having never used blender I couldn't offer advice on how to do it.

I did it in a CAD program. It could also be done in Orca slicer. Cut horizontally at 7mm height to separate the bottom part then scale the bottom part x and y to 49mm. That leaves a bit of a step internally which could probably be removed by adding a -ve cylinder primitive.

 

[pharmacist]

Well I tried the boolean cutting by defining a empty cylinder (internal diameter 49 mm) and projecting around the cylinder and trying the difference function (boolean modifyer), but somehow the whole upper area is cut leaving only a donut like ring on the bottom .