USING A TRUNNION LIKE A LATHE

[haroldm]

HI guys, did your boss ever ask you to do something that you were not even sure was possible? (nothing dirty..haha) LOL.

Ok, imagine this, i have something like a nose-cone on an airplane and my boss wants me to center it on our 5 axis Haas Trunnion and spin it like its on a lathe and turn some material off of it with a ballmill. (the head on the haas is not 5 axis, it is the trunnion itself that rotates and turns)...did that make any sense?

Is this possible?

I guess you could also imagine a clay pot spinning wheel like in that movie Ghost..that was his example not mine..

thanks in advance!

[Trevor Bailey]

easy.....use the new "parallel to curve" toolpath, lock the head at a given angle and go for it.

[haroldm]

Hey Trevor, thanks for the response, but my next question is how do i get the trunnion table to spin the part in a continuous 360? Or am i just not getting it..

[iowajim62]

just use surface toolpaths and let x,y,z do the motion, no need to try and spin it like a lathe

 

Trevor the head is fixed on Haas 5X Trunnion machines

[Chris Rizzo]

Your xy will probably interpolate x times faster than your b axis. Although with bumps at the quadrants invariably. Just surface finish blend it.

[haroldm]

Hey guys, thanks for all of the help.

I can and would prefer the surface option, but the boss is insisting that he wants it to spin like a lathe so it doesnt take as long. That was why i was asking if it could even be done. I can do the part easily enough using conventional surfacing toolpaths, but he thinks the trunnion table can spin like a lathe..

[mayday]

create a spiral on the surface and use the roldie chook. works great

[haroldm]

Hey Mayday, the roldie chook, i am not familiar with that, i have it in my C-hooks, but could you shed some light on this command? Thanks

[crazy^millman]

Do a surface flowline and set it to spiral. Back plot the toolpath and save the geometry then use that to drive a curve 5 axis toolpath locked in 4th axis mode and done.

 

HTH

[haroldm]

let me try that, thanks.

[mayday]

I use this to rough down round stock with an end mill in a 4th axis. use creat spiral and get the setting you want pitch, taper, length ect.

then run the chook and chain your spiral. output will spin your rotary while the tool traverses along the chain

[SydwazShawn]

Just to let you know, the Haas trinnion must unwind when its done!!!!! It will take for ever.

[Trevor Bailey]

you guys are making this way harder than it needs to be.

 

look on the FTP site in the X4 folder. i have placed a MCX file and an EXE machsim file showing what i was getting at. hopefully it will help you. the file names are cone_set tilt.mcx/exe

[iowajim62]

quote:

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but he thinks the trunnion table can spin like a lathe..

---

If its a trt series bolton trunnion you are running rubber belts to drive A & B. Trust me you will stretch the belt on B if you try that. Just running it 2 shifts of production as an indexer stretched the belt enough on B that after 3 months it skipped a tooth on the belt and wasn't at "0" when it slammed a 3/16" aircraft drill into the part OD.

 

Think about this, if the rotary turns at 120 degrees a second at it's max od, u r getting about 30 rpm, not even comparable to a lathe.

[haroldm]

Hey Trevor, that was what i was talking about, thanks a bunch for the help guys. On a a side note trevor, where did you get the trunnion machine for the Machsim? I have never been able to get that to work. Could i just save your trunnion as a machine of my own? Thanks again

[Trevor Bailey]

contact your dealer and he can set you up. it is the haas_vf3 model. if your dealer prefers and it is ok with Jay, i will put it on the FTP site.

[haroldm]

thanks trevor

[Matthew Hajicek - Singularity]

If you want a shorter cycle time don't use a ball, use a bull. The scallop it leaves is equivalent to that of a ball much larger than the bull, but you get the higher RPMs of the smaller tool. This works best at shallow angles that don't quite get horizontal. I'd set the nose pointing horizontal or near horizontal and run the paths from base to tip.

[haroldm]

thanks matt, that sounds like a good idea

[haroldm]

Hey trevor, in case your still there, are you using the machsim from the C-hooks or are you using a full third party simulator? i cant find the version you are using on the FTP unless it is a paid version. i emailed my dealer, so thanks for the info.

[Trevor Bailey]

standard download from camaix. your dealer will/should have the machine module.

[crazy^millman]

Here is Camaix web site link:

 

Linky:

 

HTH

[mayday]

between your first post and your last post, plenty of time to turn on a lathe. take that to he who say do it this way

[MotorCityMinion]

Proving the boss wrong can be a lot of fun.

[Colin Gilchrist]

Or a huge pain.