- Joined
- Oct 15, 2011
- Messages
- 153
Hi guys,
My students are milling a slot in a piece of 1" cold rolled square section about 100mm (4") long.
Some have made a real good job of it and a couple of others have managed to cut a slot that tapers off to 1 edge- not parallel- the edges of the cut slot are sort of rolled?.
The slot is 16mm (5/8") wide and 4mm (maybe 3/16 deep) and cuts have been 1/2mm ( .020") each pass.
Being a relative newby to milling operations - all I can come up with as a reason is they have too much feed.
I mentioned to the individual concerned that the feed seemed too fast - the machine seemed to labour, to my ears.
This 16 year old has done work experience with a local engineering company and has maybe 80 hours of experience, so he thinks he knows it all now.
The mill vice was checked for tightness and ridigity as they often don't bother to clean between the mill jaws before setting up a work piece.
The only other variables I an come up with are :
Rotation of cutter is incorrect
Cutter too far extended out of spindle
Spindle quill (if that s the term) is extended too far out of the barrel.
Can any kind soul point out any more reasons that may cause this problem.?
Thanks
Ozwelder
My students are milling a slot in a piece of 1" cold rolled square section about 100mm (4") long.
Some have made a real good job of it and a couple of others have managed to cut a slot that tapers off to 1 edge- not parallel- the edges of the cut slot are sort of rolled?.
The slot is 16mm (5/8") wide and 4mm (maybe 3/16 deep) and cuts have been 1/2mm ( .020") each pass.
Being a relative newby to milling operations - all I can come up with as a reason is they have too much feed.
I mentioned to the individual concerned that the feed seemed too fast - the machine seemed to labour, to my ears.
This 16 year old has done work experience with a local engineering company and has maybe 80 hours of experience, so he thinks he knows it all now.
The mill vice was checked for tightness and ridigity as they often don't bother to clean between the mill jaws before setting up a work piece.
The only other variables I an come up with are :
Rotation of cutter is incorrect
Cutter too far extended out of spindle
Spindle quill (if that s the term) is extended too far out of the barrel.
Can any kind soul point out any more reasons that may cause this problem.?
Thanks
Ozwelder