SpudFiles

hi

how to smooth the inside after drilling 1mm holes in a 6mm ID tube?
the small dimensions are the main problems.

inside the tube i like to move a spool with o-rings. (polished finish!?)

jean

For metal very fine sandpaper works well to lap the parts in.
Visit an automotive paint shop to watch the metal prep for a fine paintjob.
If needed start with a courser paper to get a smooth surface, then go to fine to get a polish. If your surface is not smooth, it will take a very long time with just fine paper.


With time and patience, you can get a mirror finish. Note the reflection.

Course sanding was used to remove the pipe seam.

I would take some very fine (>400 grit) sanding paper and fold it to a ball. Then put it in the tube and push it through with a small stick.
Repeat a few times, and it should be plenty smooth.

A 1mm spool valve

Where did you get the o-rings from?

A 1mm spool valve

6mm ID tube

Butane lighters are a good source I think

Ahhhhh... he means porting holes... ok...