Thread: How do you radius 3mm MDF

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.

From Carb-I-Tool Part Number T502 B

Originally Posted by CMB

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

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.

Originally Posted by CMB

I personally wouldn't be discouraged by a 4mm bullnose bit. In my experience, most 3mm MDF is actually +/-3.2mm...a +/-0.4mm .....

Craig

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.

1. 3 mm MDF may actually be ⅛ inch or 3.175 mm thick,
2. sheet size is 8x4 feet, not 2400x1200 mm. [8ft = 2,438.4 mm]
3. And then there is the "manufacturing variance" of perhaps ±0.4 mm mentioned by Craig.
   
   
   
   Fair Winds
   
   Graeme
   
   
   

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 ]