Replies

1. 
   jackplane | Mar 11, 2003 10:21pm | #1

     From what I can tell,if a backing block is not reducing tearout,you're removing too much stock in one pass.Perhaps take three passes, a little bit at a time.

2. 
   jackplane | Mar 11, 2003 10:25pm | #2

    Important! Forgot to mention-do not try to freehand cut this with a router that is fixed to a table.Dangerous. If the stock is fixed,then you can freehand cut it,but exercise good control over the router.I would not recommend this method unless you clamp a block to guide the router,and remove a little each time as mentioned before.Good luck.

1. 
   vincent843 | Mar 12, 2003 12:43am | #3

   hi,

   I clamped the work piece in a piece of MDF,then screwed  tighted scrap pieces at each end. I did many passes, but after few pass the piece broken.  I wonder should I using the clamp for the scrap pieces instead screwed them in, may be it help to back up better.  Thanks.vn.

1. 
   jackplane | Mar 12, 2003 02:23pm | #5

    The rail, or piece,should be at least 2" wide.It's best as suggested to rout the ends first,then cut the arc.In other words,rout end grain then long grain.When using a cope and stick bit, I find it best to have the router fixed to a table and run the stock using a mitre guage in a slot, with a backing board.Freehanding from above means too much chance to move it out of plumb,destroying the cut.

1. 
   vincent843 | Mar 12, 2003 06:40pm | #6

   Hi All,

   OK.  Start from the beginning.  I am using PC7518, set at 13,000Rpm on the table.  The piece is 4" wide  and 2 1/4" at the arc.  I cut the cope first, then cut the arc.  After that I did the stick, and the problem was the end piece broke after the second or third pass.  Also, burned marks appeaed at some place, my guess is probably I fed the piece too slow.  The work piece was clamped in a piece of MDF for safety, and two scraps piece screwed to the MDf also at each end of the work piece (what I was trying to do is just slide the work piece between the scraps).  If I am correct, I think I should clamp the scrap pieces  to the work piece as well instead of screwed them in.  I haven't done this yet since I am waiting to get some more help.  Thanks. vn.

3. 
   DaveHeinlein | Mar 12, 2003 02:06am | #4

   What I do is cope the ends of the piece before I cut the arch. You might want to cut the sticking in two passes, but I've never had much problem with blowout