I just read the Q/A section of this recent issue concerning climb cutting. I had
to do just this in a similar situation and had no tear out but sure had lots of
burn marks!!! How to eliminate burn marks while climb cutting and how to remove burn marks
thats on the wood? I was thinking the next time I want to elimininate tear out is to use different
size bearings on the routerbit, moving from large to small.
Replies
Making incremental cuts, taking off only a little each pass, is the way to go with most router bits. This can be done with different size bearings or moving the fence. With climb cutting, you don't make a continuous cut like you would going against the rotation. Instead you nibble, starting at the end, dropping on to the bit, then moving to the end. You never want any material behind the cutter or the piece will get launched.
Don't know if this picture will help. I'm about to drop the piece against the bit, then move it about an inch to the right. I'll keep repeating this until I reach the top of the arch where the grain direction changes. The depth of the cut is controlled by the fence, which will eventually be cut all the way through. You want a tight fit so the work can't get sucked in. I'm only dropping in the width of the bit so there isn't any material left for the cutter to grab.
Check out Charles Neil's bump cutting tip.
http://www.youtube.com/watch?v=-l4suyL84-w&feature=related
pete
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