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Thread: How do you radius 3mm MDF
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12th November 2013, 06:56 AM #16
I personally wouldn't be discouraged by a 4mm bullnose bit. In my experience, most 3mm MDF is actually +/-3.2mm...a +/-0.4mm profile discrepancy on each face is pretty negligible in my books, and nothing that a once-over with a bit of 240 or 320 wont fix. You'd most likely have to do the same using a 3mm bullnose bit if the MDF varies marginally or dips/rises even a poof-teenth when routing. A small ridge is easier to rectify than a dig-in. You could also choose to leave the ridge in tact, it sometimes adds a certain crispness to the finished product.
Craig
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12th November 2013, 09:08 AM #17
1/16" Roundover bit
I use a 1/16" (1.6mm) Roundover bit in a router table for that job. It's perfect for it.
It means doing both sides - but that's not hard.
A lot cheaper than getting a special one made.
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13th November 2013, 08:28 AM #18GOLD MEMBER
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Craig is probably on the money about the 4mm bit. Using a rounding over bit to do one side at a time is ok if you only have a few runs to do but if you want to go into production with a product I would imagine you will be doing a fair bit of this profile and one side at a time is twice the time (not what you want in a production run.)
Regards Rod.
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13th November 2013, 03:08 PM #19
Good Morning
Craig is quite correct, but actually understates the situation.
Many sheet materials are actually still made to imperial specifications and then inaccurately labelled with a decimal approximation.
- 3 mm MDF may actually be ⅛ inch or 3.175 mm thick,
- sheet size is 8x4 feet, not 2400x1200 mm. [8ft = 2,438.4 mm]
- And then there is the "manufacturing variance" of perhaps ±0.4 mm mentioned by Craig.
Fair Winds
Graeme
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13th November 2013, 03:58 PM #20
This is 1/8 Radius bull Nose. I use it all the time on 3mm MD Fand you cant tell the difference.
http://www.magnate.net/ProductDetail...oductCode=PG14
Regards
Harold
5811: Radius:1/8"; Shank Diameter:1/4"; Bead Diameter:1/4"; Shank Length:1-1/4"; Overall ]Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.
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