The Shop > Metal Stuff
Milling question.
BK:
Why do I only get a good finish one direction?? :bang:
I'm using a 3" face mill, the initial cut is good, but I get "secondary" marking from the "back spin" of the mill.
This is moving the table from right to left. ::)
I thought play in the bearing, but that would do the same both ways.
This is left to right. :thumbup:
I spun the vice 90 degrees and got these results.
Any ideas?? :doh:
Bogstandard:
It is purely because the tramming of your mill is out. Nothing to do with bearings, so don't worry.
One way, you will get just one edge cutting, whereas on the reverse cut, both edges will be cutting, first a shallow cut, then the back edge follows along and does another secondary cut.
Hope that explains it OK
Bogs
Artie:
Gday mate, assuming the tramming..... one issue I found was the trapped or retained swarf on the cutter as it passes over the job on the 'back-spin' causing marking or scuffing.... I use a small jet of compressed air while cutting, makes the world of difference, on aluminium, try a squirt of wd40 as well.
Good luck.
BK:
Thanks for the quick answers, but a question??, err, how do you adjust the tramming on a fixed head mill??
It goes up and down, and will swing either way, but, no tilt??
Bogstandard:
What type of mill is it?
If it is a round column mill/drill, then it is a matter of shimming up the clamp base at the bottom of the column to get it spot on. Once done, it should never need to be done again, so it would be pointless to invest either time or money in making or buying a tramming tool. You would use the old method of a DTI on the end of a bent rod.
If it is a combination of a rigid vertical column, but swivelling head, then it would be a combination of shims to get the column truly vertical and so square to the table, and then head adjustment using the swing feature either way, in which case a tramming tool would be desireable but definitely not essential.
Bogs
Navigation
[0] Message Index
[#] Next page
Go to full version