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post #1 of 16 (permalink) Old 02-27-2015, 12:03 PM Thread Starter
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Default Round over bit help

Hello, I found this forum and love it, I am new to woodworking and currently renovating my house window trim, I purchased the bosch 1617 combo and ra1171 table, I am trying to round over both sides of a 1x4 by 3/4 peice of stock so I can use it as a bead and a top cap,. The problem I'm having is no matter what I set the bit hight at or how much I isolate the bit or move the fence I get a ware line in the middle of my scrap or work peice, I am using a 3/8 round over bit, thinking it's half the size of 3/4. I read on the forum to put a peice of wood to try to set the hight, and numerous adjustments I still get a line weather it's pronounced or faint, thanks for all of your anticipated help.
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post #2 of 16 (permalink) Old 02-27-2015, 12:14 PM
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'Morning, Eugd; welcome.
If the bit is pulled back slightly behind the fence, so that the top corner of the bit disappears behind the fence...maybe a 1/64"...it shouldn't be possible to get any marks other than maybe a burn mark from feed rate. I should have added the same applies to the bottom corner of the bit, unless of course you want that sharp bit of profile. You didn't say whether you were using a bit with a bearing, or not(?).
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post #3 of 16 (permalink) Old 02-27-2015, 12:35 PM
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It's likely you may have to offset the outfeed fence on the flip side cut...is it cutting too much on the flip side pass leaving a step...?

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post #4 of 16 (permalink) Old 02-27-2015, 12:40 PM
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Quote:
Originally Posted by Eugd View Post
Hello, I found this forum and love it, I am new to woodworking and currently renovating my house window trim, I purchased the Bosch 1617 combo and ra1171 table, I am trying to round over both sides of a 1x4 by 3/4 piece of stock so I can use it as a bead and a top cap,. The problem I'm having is no matter what I set the bit hight at or how much I isolate the bit or move the fence I get a ware line in the middle of my scrap or work piece, I am using a 3/8 round over bit, thinking it's half the size of 3/4. I read on the forum to put a piece of wood to try to set the hight, and numerous adjustments I still get a line weather it's pronounced or faint, thanks for all of your anticipated help.

FWIW.. that line is because of the irregularities in material as it is bit settings..
hand sand the line away or use a 5/16 RO bit w/ a guide bearing..
unless you use a bullnose/half round bit you will get that line...

Freud Tools

here's some other styles to consider...
Attached Files
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File Type: pdf windowsill.pdf (26.4 KB, 52 views)

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Last edited by Stick486; 02-27-2015 at 12:43 PM.
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post #5 of 16 (permalink) Old 02-27-2015, 01:36 PM Thread Starter
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It's a 3/8 round over bit with a barring on top, I want to round over both sides of a 1x2 that is 3/4 think. If the bit is raised up where it meets the stock the line is very apparent on the wood throughout the middle, if the bit is lowered it's less, if I sneak up on the wood with multiple passes I still get a line, I tried to isolate the bit more or less and still get some sort of wear line in the middle, it's not burn marks, it becomes almost a profile as a result of the what I'm doing. I don't think it's the fence offset because the barring on the round over should help isolate the bit and the work peice? Unless I am not isolating the bit enough.
I'm going to read some of the attachment to see if it helps, thanks for all of the info, it's much appreciated
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post #6 of 16 (permalink) Old 02-27-2015, 01:40 PM Thread Starter
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Just reread sticks response I that I need a half round bit, I have a set of 50 bits. I'll check is there anyway I can use another round over bit maybe halfway through to get the same effect?
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post #7 of 16 (permalink) Old 02-27-2015, 01:54 PM
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Quote:
Originally Posted by Eugd View Post
Just reread sticks response I that I need a half round bit, I have a set of 50 bits. I'll check is there anyway I can use another round over bit maybe halfway through to get the same effect?
5/16" RO and hand sanding...

This would have been the week that I'd have finished chewing thru the restraints...
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post #8 of 16 (permalink) Old 02-27-2015, 07:30 PM
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With the 3/8 RO you are rounding off the area where the bearing is supposed to ride on the second pass. That's why you are getting a line. Set the fence so that the bearing is even withe fence and then move it forward a thou or so to make sure the board isn't riding against the bearing.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.

Last edited by Cherryville Chuck; 02-27-2015 at 09:10 PM.
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post #9 of 16 (permalink) Old 02-27-2015, 08:46 PM Thread Starter
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Thanks for all the info, your right chuck, that did the trick,
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post #10 of 16 (permalink) Old 02-27-2015, 10:57 PM
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Eugd, if you ever use a bullnose bit instead, the set up is similar. You want the center of the gullet on the bit even with the fence or ever so slightly behind the fence which will leave a tiny flat on the center of the edge that you sand off. The trick with setting up the bullnose is to measure to the center of the gullet. I find the easiest way to do that is with a round dowel of a radius equal to or slightly smaller than the one on the bullnose.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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