Trochoidal Machining

[limitless creativity]

Any thoughts on Trochoidal machining? Any one used this type of HSM? I would like to see it in MC as a contour or slot option.

Mike

[Allan Brown]

Not there for 2D toolpaths, but it's already available in surface rough pocket machining. Download the the latest patches and run the Appcfg.dll C-Hook. Enable "beyond 8.1.1" features.

[Will Slota]

How do you enable "beyond 8.1.1" features

[d0gFartz]

with the c hook Dave just talked about

[Quickmike]

Does anyone have some typical cutter parameters for using this style of machining? I'm trying it for the first time as I type this. Iscar 3/4dia. with 3 inserts .300 depth of cut 3000 rpm 52 ipm. It seems to be working good. Any other suggestions that might be helpful? Thanks to whoever might have some more insight on this type of machining.

[P_Scott]

Mike,

 

Trochoidal machining is available on 2D pocket operations, using the High Speed Roughing method in V9. When the High Speed roughing is selected, the High Speed button below it becomes available. It will allow the user to change the size of the trochoidal loops as well as adjust for the material, to work in only areas of full-diameter cut, or throughout the entire pocket. Just one more reason to update to Version 9. HTH

 

[ 04-30-2002, 01:15 PM: Message edited by: Peter Scott, Services 4 Automation ]

[Mick]

I'm all for it to be able to "trochoidally" slot a slot. Its a toolpath that I've programmed before by drawing the shaped of the centreline of the cutter, though its a real pain to do

 

I've cut a slot in 60HRC steel before, with a 6mm endmill, producing a 9mm wide slot, 12mm deep. It sure was impressive, and quick

[gary dunn]

explain to me exactly what trochoidal is please ?

[kccadcam]

Trochoidal Machining

 

One of the newer techniques to increase rough machining speed involves a tool path strategy called trochoidal machining. This machining style removes material using the side knife-edge of the cutting tool.

 

“Trochoid” describes a type of curve. A trochoid is the trace of a point fixed on a circle that rolls along a line. More generally, a trochoid is any curve that is the locus of a point fixed to a curve A, while A rolls on another curve B without slipping. (See illustration, below.)

 

Trochoidal machining is well suited to HSM because the cutting tool always moves along a curve of constant radius. This allows a consistent feed rate to be maintained throughout the machining process.

[gary dunn]

are there any examples available for 8.1.1 ?

i think, from what you are saying, it is similar to the high speed loop option. i'd like to see it in action.

[TheePres]

ahh?? KcCadcam, explain again please what trachoidal machining is.

[BernieT]

I think 'trachoidal machining' is what OJ Simpson did.

 

BerTau

[Mick]

I've put an example of trochoidal machining on the FTP site. Its under MC8 Files, named Trochoidal.mc8.

 

This type of cutting is great to see in action, especially when cutting hard material. It produces nice even chip load. The only real drawback is having to produce the geometry to be able to toolpath it. This could be a good little c-hook add on And I'd be willing to beta test it

 

Anyway, let me know what you think

[Lucky]

Anyone have parameters for this? feedrate, rpm, depth as a percentage of cutter dia, loop size, forward feed per loop, etc.

[Quickmike]

I posted some parameters that I was using a few days ago on 4-29-02 before that nobody had posted on this thread in quite sometime. Maybe a tool rep has some guidelines for some particular cutters that can be posted or refered to. I am hoping someone posts some particulars as a guide for getting started with type of machining.

[Mick]

I'll see what I can find out. I used to be a tooling rep for Sandvik Coromant, and I have a couple of contacts who are up with the play overseas. I think we should keep trading notes on this one

[JAMMAN]

Trochoids (eventhough I can't even pronounce it)

 

[gary dunn]

okay, i got the example files from the ftp site

and i see how it works, my big question is,

and i SHOULD know how, but HOW did you draw that

squiggly thingy ? oh, never mind i figured it out. this is kewl. i'll try it.

[Mick]

hehe...Two arcs, .1mm apart, with a another slightly larger arc bridging it. Then you translate that set the number of times required, at the distance required. All the arcs need to cross, and not share any endpoints. Otherwise you will go crazy chaining them