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Thank you and no need for an apology! I'm using a fairly new set of Matchfit bits on my router table, including the Matchfit relief bit. I was seeing the blow out with the relief bit cross cuts (I did the relief cuts first all around). I'm not sure what type of MDF I'm using. It's a piece that has been kicking around for years I figured I'd use up, so I'll keep in the back of my head it may be the issue. I'm heading out of town for the weekend, but when I get back next week, I'll play with some scrap MDF and see what I can discern. I'll look at feed rate as my primary suspect and then try a spiral upcut bit instead of the relief bit. Thanks again. -
@Von - Sorry for the slow response. The blowout you show looks like a dull bit or a too-fast feed rate issue. I cut the MDF at the router table whenever possible. Table or freehand I cut the 1/4" relief grooves first using an upcut spiral that helps pull the spoil out of the cut as I go. Once all the relief slots are cut I cut the dovetails using the Matchfit bit. I have cut them with a regular 14* x 1/2" dovetail bit but found softening the shoulders by hand after the fact became pretty tedious. That is, the bit is well worth the money if you are gong to use this system IMHO. At any rate, I use a steady, smooth feed rate and try to control the material as much as possible with push pads (at the table) or good router motor control (when freehand). I think of myself as a human power feeder and try to be as consistent as possible. The sound of the router motor acts as my guide in keeping a consistent feed rate. I don't know that I have ever had any of the "ultralight" MDF product in the shop and just used what I had on hand so I do not know if this is a contributing factor. -
Aw, sorry to hear you're not feeling the hybrid water heater vibes! Sometimes those fancy gadgets don't live up to the hype. I remember when we tried out a similar setup a while back. It seemed like a game-changer at first, but it ended up being more trouble than it was worth.Speaking of tricky tech, we had a bit of a saga with our boiler in London. It was one of those situations where it seemed like every other week something new was acting up. -
Matchfit is indeed my plan. @gee-dub - Looks like you conquered or didn't have the tear out issues I ran into cross routing in MDF? The vertical jig on your sled in your first photo looks like it has an MDF face(?) and looks pristine. I reviewed your post on your table saw sled, but I think you only cover routing slots in plywood, which hasn't given me any problems.
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I feel like 3M is a company that I can always depend on. I use quite a number of different 3M products and have never been anything but completely pleased with any of them, not only in woodworking but also marine and automotive plus even golf.
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