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Chatwin polygon box

Drive mechanism

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Robert Dodds22/02/2015 21:15:56
324 forum posts
63 photos

Martin P,
Please don't get offended. Your post was read and noted but the eyes glaze over sometimes at the thought of drawing loci and the like so the pictures that Schwanog put out by way of explanation were a quick solution to understanding the methodology of this type of tooling.
Meanwhile no one is telling me how the Fast Cut machines can machine slots in the end face of a bar!
Bob D

jason udall23/02/2015 09:49:19
2032 forum posts
41 photos
Unless I am over looking some thing in the fast cut video.

Many cnc lathes have full C axis control and mill capable live tooling..

With C axis and control of X and Z..the tool path can be taken anywhere you like..the trick becomes on the real world tool radius...

Milling polygons in end working is common practice...
As are face and perimeter milling/engraving.

Polygon TURNING.. now that is a differnt fish...
But was included in the demo from a 1980's machine we once had...

Again just a matter of controling C and X and Z..at say 1000 rpm...
Its just a matter of machine agility and stiffness...oh and computational power...but thats cheap...and not realtime.
jason udall23/02/2015 09:57:46
2032 forum posts
41 photos
So simply put...draw your desired grove.
Across the bar face.

Now calculate as many points as you desire (you know how flat a slot you need).....these points in C and R..polar coordinates...
These
Coords are programmed?Into a move say..G01 C180.34 X 20.345 Z -3.0..
And so on for the other points....as many as you see fit...
And in modern controls "conversational " programming even does the arithmetic for you.
Lionel Titchener28/02/2015 17:03:21
26 forum posts
5 photos

If you think of the C axis as the same as the Y axis on a mill, it's easier to visualise how it's programed.

The C axis will allow just about any shape to be made. The X axis just moves in and out as the spindle turns slowly converting the degrees to the Y movements.

Working on the face is OK, slots on the outside surface have a curved bottom as the spindle turns, It will slot OK on centreline with driven tooling, but when the slot needs to be off centre you get the curved base.

Lionel Titchener28/02/2015 17:06:04
26 forum posts
5 photos

Need to, edit the above post, should have said you do not get 90 degree sides to a slot when moving in the C axis.

Ady121/03/2016 11:11:01
avatar
6137 forum posts
893 photos

There's currently one on a well known auction site, search for polygon

The internal plate for the cutter to follow can be seen from the piccies (no's 5 and 8)

Edited By Ady1 on 21/03/2016 11:13:13

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