Off center turning (Mill turn)

[GoetzInd]

I've got a part very similar to the one in the linked video. My question is have any of you multi task guys tried any off center turning? I'm curious about the roundness of the diameters turned. Also, wondering what paths used. Gonna start out with 4th axis. Any suggestions?

 

 

 

Thanks,

Mike

[Dave.L]

Never done it, but WOW, that's really cool!!

[Josh T™]

Too freaking COOL! Man that is a trip! The 2nd Video was wild! I wouldn't know where to start... let us know how it goes.

 

Very interesting

[Alvaro Gil - Cimquest-inc.com]

OMG that is sooooooooooooo cool!

[Greg Williams]

Ah yes I think this is an option that was originally written for crankshaft turning. Not usre about the Roundness. Maybe ask Mazak?

[Bwalker]

it appears to me as being more than likely programmed as a 5 axis multisurface operation (probably modified with a post) running a high speed option. I know for sure that it is not a mazak option.

[Bwalker]

by modified with the post, i mean using custom operation parameters. There isnt too too much thats overly crazy involved in doing the programming for such a thing

[Greg Williams]

quote:

---

it appears to me as being more than likely programmed as a 5 axis

---

Yeah I think you are right. I will have a play and see what I can come up with

[Greg Williams]

Below is a similar process

 

Okuma CAM Lathe

[GoetzInd]

Iv'e got it using a 4axis path. All I need it to do is stay on centerline to the drive surfaces. Any suggestions?

 

MIke

[Ron Branch @ Verisurf]

Can you put a Y offset on your tool? That would then allow you to put the tool on center like you need.

[ATG]

Wow, It would take me all day just to dream up parts that I could run.......Very Cool..

[GoetzInd]

OK,

I just did a very successful test cut on a Y axis millturn with a piece of brass. 3/4 dia stock with a .625 turned dia .0625 off center. Dia and positioning accuracy was right on and the roundness was within .0001 which I was pretty excited about. I did not use any multi axis paths and anyone with a CAD program can do it.

 

Basically I drew the .75 circle and the offset .625 circle in the right side WCS. I then rotated the .625 Dia. 3times in 90 deg increments around center. I then drew an arc that intersected the center line of the 4 .625 circles. This arc turned out to be .125 I then contoured the arc with a ramp of .004 (My feed per rev) and a depth of 1". I turned compensation off as I was using the tip of a lathe tool and this wasn't even actually a mill op. I have complete arcs outputting at 90deg so I added a H-90. (C axis incremental) to every line of the code. I'm sure the post can be modified to do this automatically.

 

The result was a .625 turned diameter exactly .0625 off center and almost perfectly round.

 

I will post a video when I finish the actual part.

 

Mike

 

[ 09-09-2009, 01:55 PM: Message edited by: GoetzInd ]