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post #1 of 6 (permalink) Old 03-25-2010, 08:11 PM Thread Starter
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Default Routing MDF

Hi All- I need some guidance routing MDF such as bit and material feed speed. I performed a search through the site but did not come up with any results. My material is showing feathering on the routed edges which cannot be sanded smooth. Is it possible to achieve the results I am looking for? Thanks
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post #2 of 6 (permalink) Old 03-25-2010, 08:24 PM
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Hi All- I need some guidance routing MDF such as bit and material feed speed. I performed a search through the site but did not come up with any results. My material is showing feathering on the routed edges which cannot be sanded smooth. Is it possible to achieve the results I am looking for? Thanks
HI Paul - welcome to the forum
I sometimes get some feathering when I use a profile bit and the profile is just barely cutting the surface plane. I haven't tried sanding it off, use a sharp chisel and it shaves off fairly easily. As far as preventing it, the only way I have found is to change the depth of cut to get a more vertical angle on it. Of course, that changes the profile some. Bit speed and feed rate don't seem to make much difference in my experience.

John Schaben

The problem with experience is I usually get it immediately after I need it.
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post #3 of 6 (permalink) Old 03-25-2010, 09:22 PM
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Originally Posted by mavrick1100 View Post
Hi All- I need some guidance routing MDF such as bit and material feed speed. I performed a search through the site but did not come up with any results. My material is showing feathering on the routed edges which cannot be sanded smooth. Is it possible to achieve the results I am looking for? Thanks
Paul... I recommend using the bit itself as a scraper to clean up the edge. Use a cloth towel or scrap of leather to protect your hand from the other side of the bit as you use the bit profile to scrape the surface clean.

If the bit isn't really sharp, you may want to sharpen it before scraping. Remember to only sharpen the back side of the bit, and only as much as needed for sharpness, so as to not change the profile.

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post #4 of 6 (permalink) Old 03-28-2010, 08:37 PM Thread Starter
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Thanks Guys, I am re-trimming my entire home and thought I would save a little money using MDF. All the trim will be custom, hoping to add some value to the home as my wife and start considering down-sizing, housing market being what it is. I am going with Craftsman style and wainscoting throughout.

Box store trim won't cut it, #2 pine is a pain in the arse, with knots and warping, and clear pine is twice the price of molding. Since all will be painted, figured I"d give it a shot.

Will try all suggestions given, though I really hope scraping with the bit fails!! The thought of scraping several hundred feet of molding by hand is giving me a headache.

Paul
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post #5 of 6 (permalink) Old 03-28-2010, 08:50 PM
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Thanks Guys, I am re-trimming my entire home and thought I would save a little money using MDF. All the trim will be custom, hoping to add some value to the home as my wife and start considering down-sizing, housing market being what it is. I am going with Craftsman style and wainscoting throughout.

Box store trim won't cut it, #2 pine is a pain in the arse, with knots and warping, and clear pine is twice the price of molding. Since all will be painted, figured I"d give it a shot.

Will try all suggestions given, though I really hope scraping with the bit fails!! The thought of scraping several hundred feet of molding by hand is giving me a headache.

Paul
Good Luck Paul - I just made new drawer fronts for our kitchen from 3/4 MDF and it ALL feathered, edge profiles as well as the bead borders.
I did notice that some profiles are better than others so you may do some experimenting there. As long as you are doing a bunch of it a different profile may not be that noticable.

John Schaben

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post #6 of 6 (permalink) Old 03-29-2010, 06:41 PM
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Instead of using the bit to do the scraping, would it be possible to get a scraper cut to that profile? Or would that be too expensive? I just think it would be easier to do with a regular scraper than trying to hold onto a bit that has a sharp edge on the opposite side even if you do cover it with leather or something and wear gloves.

But as normal, almost all of my experience is just reading and watching, not actual doing.
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