guess what cutting tool made this cut

[gzig5]

Without a closeup, it seems a bit odd since a horizontal bandsaw normally makes marks at a varying angle with reference to whatever side is held in the bottom of the vise. That's because it pivots around a point below its bottom wheel. Those all look nice and straight. Did you cut it with the bandsaw vertical?

Paul

Dan may correct me if I am off base, but it sounds like we are focusing on the wrong surface. I don't think he cut the broad surface that is parallel to the table on with the band saw. But rather the four narrower vertical sides that the picture doesn't show so well. The key for this is his statement that the other three edges look the same. If I'm incorrect, that's one hell of a band saw.

[.RC.]

Try this. I made one change that might disclose how the filter works.

I can see them now, although our government's mandatory filtering system is not active yet, and it may not even get off the ground the way public sentiment is over it...

[jkilroy]

Governments Internet filtering system? Whose government is this?

[BillH]

Governments Internet filtering system? Whose government is this?

Australia, the same people who banned guns. Don't say the Right Winged Gun Nuts didn't warn ya!

[dan s]

Dan may correct me if I am off base, but it sounds like we are focusing on the wrong surface. I don't think he cut the broad surface that is parallel to the table on with the band saw. But rather the four narrower vertical sides that the picture doesn't show so well. The key for this is his statement that the other three edges look the same. If I'm incorrect, that's one hell of a band saw.

No the broad surface was cut as well.

[Silverback]

what caused the 2 lines across the face?

[.RC.]

Governments Internet filtering system? Whose government is this?

The current left wing Australian government plans on introducing a mandatory ISP level filtering system, filtering out what the minister calls "unwanted" content...

http://en.wikipedia.org/wiki/Interne...p_in_Australia

Our PM speaks Chinese so you know where he got the idea from...

[dan s]

OK guys I took some new shots perpendicular to the surface and posted them on my blog. http://www.dans-hobbies.com/

As to what caused the distinct vertical lines, I'm not sure. swaf, blade deflection if anyone has a theory I would be happy to hear it.

Come on guys I'm a little crazy, but no way would I run aluminum through a tool designed for wood.

[jkilroy]

I think what looks like vertical lines is actually some condition present in the extrusion, not a side effect of the cut.

[Evan]

but no way would I run aluminum through a tool designed for wood.

Why not? Wood working bandsaws do a great job on 6061 and similar alloys. It's only the 7000 series that really shouldn't be put through wood working equipment, at least not in the fully treated condition. The 7000 series alloys are harder and stronger than mild steel and will damage most wood working cutting edges but other aluminum alloys can be easily cut using a circular saw, a table saw, a radial arm saw, a bandsaw, a miter saw and especially handy, carbide router bits in a milling machine.

All the corner rounding on this tailstock was done using wood cutting carbide router bits in my milling machine.