advantages of upmilling on Aluminium material

[zaheerabbas97]

hi,
iam newbie to cnc i would like to advantages of upmilling using a coated carbide cutter. and what if using down milling. as i asked to my senior just he avoided to answer

thanks for your usefull suggestions

[mxtras]

Climb milling will typically leave a better finish.

Scott

[dertsap]

climb milling the cutter pulls the chip away from the work piece ,conventional milling pushes the chip into the work piece

[psychomill]

Also, in the past... a solid carbide endmill didn't like the extra "shock" (so to speak) of conventional cuts. It's really noticeable when you started feeding real heavy.... the tips would chip or break... if not the whole endmill snapping. Many tools are tougher today though. But its good practice (with better and "expected" results) to climb cut.

[Madclicker]

Originally Posted by dertsap climb milling the cutter pulls the chip away from the work piece ,conventional milling pushes the chip into the work piece

I'm confused, but I was born that way. The link below seems to say the opposite and is the way I always thought it was.

http://www.hanita.com/hanita_protected/tec00006.htm

[dertsap]

i dont think your link shows the opposite ?
if the chip is being pulled thru the work piece it will leave the chip behind as your link shows , if it is pushing the chip it will leave the chip in front of the path which is also stated in the link
climb milling always has a pulling force where as conventional is the opposite

when lets say a part wasn t tightened correctly and the part comes out :

conventional will push the part away from the cutter most times with minimal damage to the tool and part (if your lucky),
climbing will pull the part into the tool throwing the part with a higher chance of damage to the part and tool

[Geof]

Originally Posted by psychomill Also, in the past... a solid carbide endmill didn't like the extra "shock" (so to speak) of conventional cuts. It's really noticeable when you started feeding real heavy.... the tips would chip or break... if not the whole endmill snapping. Many tools are tougher today though. But its good practice (with better and "expected" results) to climb cut.

I'm confused .

I thought 'conventional cuts' were up milling where the cutting edge enters the workpiece gradually; so where does the "shock" come from?

[Madclicker]

Originally Posted by dertsap i dont think your link shows the opposite ? if the chip is being pulled thru the work piece it will leave the chip behind as your link shows , if it is pushing the chip it will leave the chip in front of the path which is also stated in the link climb milling always has a pulling force where as conventional is the opposite when lets say a part wasn t tightened correctly and the part comes out : conventional will push the part away from the cutter most times with minimal damage to the tool and part (if your lucky), climbing will pull the part into the tool throwing the part with a higher chance of damage to the part and tool

I guess it just depends on how you describe how the chip is being "pulled". I would describe it the other way around.

[dertsap]

Originally Posted by Madclicker I guess it just depends on how you describe how the chip is being "pulled". I would describe it the other way around.

probably why i m not a teacher ,that and my low patience level

[joecnc1234]

In cnc milling a climb cut is always better. The spindle pulls the part towards it. The load is less and tool life is better. Try it on a conventional mill climb mill and it pulls the table conventional cut and you have to force the movement. The shock comes from the flutes banging against the workpiece. Your drawing demonstrates the tool movement but invariably some of the chips won't clear then you recut them and wear the tool faster. with the rigidity of most cnc's climb cutting will put the chip behind the cutter to be blown away by the coolant spray.

[HIRAH]

i usually climb mill. but there are certain times that conventional milling has an advantage. and to me that is cutting a flame cut edge. when you conventional mill, the cutter is starting from the inside of the flame cut and breaking off the chip, rather than cutting into the harder flamecut.

[joecnc1234]

I agree with you hirah that would defiantly be a case for climb cutting.