Barfeeder

Hi all
I know this might not be the right place for this question but I know there are quite competent people in the Okuma section.
I'd like to ask you if you from your experience know how does a profiled bar change happen?
Should the barfeeder be of a special type and how is it introduced into the barfeeder collet and the lathe collet?
Cheers

some of the answers depend upon the make and model of the bar feed
lns332 bar feed
you would turn the end of the bar for the pusher collet
the bar should be well chamfered on the other end to make it go easier into the collet
you would have round guides to support the bar
then the bar change cycle would bring the bar to just behind the collet
this is where the bar feed would start peck inserting the bar to get it to go into the collet (collet is running a low rpm here)
after so many unsuccessful attempts it would alarm out

hi gunda, there are several methods :

1) like rcs60 said, stock is chamfered at both ends, and a little bit turned od at the end that goes inside the collet

feeder will keep on pecking, while the collet will be spinning at a low rpm

remnant is pulled back and dumped inside the feeder

2) some models do not have a collet, but a pusher

there is a mechanism that rotates the bars, and gently puts them inside the v-shaped loading channel ( bars have to be oriented before the mechanism that rotates them )

cnc spindle stops at a specific phase, and waits for the pusher to bring the material

remnant is dumped inside the cnc lathe

this method has the advantage that it does not require to turn + chamfer the material, but only to debur it :)

3) more complex models :
... do not require that the material is oriented before the mechanism that puts the bar inside the v-loading channel
... may have sensors that detect if the stock is seating ok inside the v-channel, because, sometimes, it may not fall ok, but remain suspended at a higher position; from this moment, 2 things may happen :
...... when the pusher pushes the stock, it will fall, so is like nothing happened
...... if it does not fall, then it won't be able to pass through the reduction sleeves, and the feeder may be stopped automatically by a torque-limit on the servo

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all these should work for :
... round bars ( sections has many simetry axis )
... hex ( section has 6 simetry axis )
... square ( section has 4 simetry axis )

i don't know how are handled those with 1 or less simetry axis, thus i don't know about custom profiles / kindly :)

Good points rcs60 and deadlykitten. Thanks for the advice, I'll give it a shot and see what happens but surely will get some result that works. Cheers