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spool valve

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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spool valve

Unread postAuthor: jean » Fri Mar 15, 2013 9:57 am

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
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Unread postAuthor: Technician1002 » Fri Mar 15, 2013 10:38 am

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.
Image

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

Course sanding was used to remove the pipe seam.
Image
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Last edited by Technician1002 on Fri Mar 15, 2013 12:17 pm, edited 2 times in total.
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Unread postAuthor: Labtecpower » Fri Mar 15, 2013 10:38 am

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.
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Unread postAuthor: jackssmirkingrevenge » Fri Mar 15, 2013 10:56 am

A 1mm spool valve :shock:

Where did you get the o-rings from?
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Unread postAuthor: Labtecpower » Fri Mar 15, 2013 11:19 am

A 1mm spool valve :shock:


6mm ID tube


:wink:


Butane lighters are a good source I think :)
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Unread postAuthor: jackssmirkingrevenge » Fri Mar 15, 2013 11:20 am

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