Making Eliptical rod/tube?

I was interested to see that it might be possible to turn the oval bolting flanges on glands. At the moment I do it by using small and large filing buttons and would be fascinated if someone could explain to me how they can be turned.

Bernard

You will just have to wait until I get round to describing how that part was made over on MEM

What you can't easily see in the above two pictures is that I notched out the channel to take two rods

The split top bearing housing was clamped to one rod and the bottom "rings" held with grub screws to the other, some pieces of scrap copper tube were also used to stop things moving sideways.

The bearing housings also had small spigots machined onto them which located into the straight side tubes and some pins were added to do the same at the other end.

The other parts were all carefully scribed to the side rods which kept them quite well located and I just needed the two blocks of metal to hold the short diagonal pieces in place. To stop everything dropping the two firebricks were packed up so they supported all the parts.

It would have been nice to fillet braze all teh parts but not having oxy I opted for silversolder and a wipe of JB weld just to blend things together.

J

Bernard, I'll have a look at my photos to see If I have any being done in the lathe but now I mostly use a boring head to cut the two larger curves. If Andrew Johnson sees this he may add the photos of some bosses he posted elsewhere last week.

J

> a wipe of JB weld just to blend things together.

Miss!! Jason's cheating!



Neil

I have seen it, and I'm none the wiser. So either the reference isn't to me, or, more worryingly, I posted something which I've completely forgotten about.

I'd either file an oval gland by hand or use the CNC mill. If I was filing I'd do it by eye rather than bother with buttons.

Regards,

Andrew

Ah Sorry Andrew it was Doug with his 3" Fowler using the same boring head method that I use, this is his photo

The same method can be used on the lathe but the part is placed off centre buy holding the block in the 4 jaw or drilling off ctr in the end of a bit of round bar.

Edited By JasonB on 04/12/2012 10:58:08