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 Kerfing MDF

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PostSubject: Kerfing MDF   1/7/2012, 12:05 pm

Here is a good video on kerfing MDF.

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PostSubject: Re: Kerfing MDF   1/7/2012, 4:10 pm

Hellllllz ya!!! So gonna change my design. Thanks for sharing Tony!

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PostSubject: Re: Kerfing MDF   1/7/2012, 4:13 pm

Haha. It is a bit tricky the first few tries. Take your time and bend gently otherwise the wood will break. Try a few scrap pieces first.
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PostSubject: Re: Kerfing MDF   1/7/2012, 4:18 pm

For sure..... can't wait... working on the new design... will be more like the van. Twisted Evil


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PostSubject: Re: Kerfing MDF   1/11/2012, 5:27 pm

This is a great video upload!
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PostSubject: Re: Kerfing MDF   1/11/2012, 8:49 pm

here is more info to go with the video, as far as I know it was made by the same person that did the video.....

The Math:

I go through the math in the video but in case you are having a hard time understanding this should help. Please note this is used for slot porting applications so when I reference “diameter” I am NOT talking about a circular port, I am talking about the curve of the kerf if you were to look at it along its cross section. See the photo below:



Step 1:
Determine the diameter of your curve. Note I said “Diameter NOT radius” if you have your radius just multiply it by 2 and you now have your diameter).

Step 2:
Find the circumference of a circle using this diameter. The equation is:



Step 3:
You should now have a value for your circumference. Take this value and divide by 4 for a 90 degree turn or 2 for a 180 degree turn, this will give you the “length of kerf”.



Step 4:

Record your value for the length of the kerf. This is how much material along your mdf “linearly” must be used to make your curved kerfed section. This is the value you want to “mark off’ for your kerf on the mdf. (Note that this method can also be used to find the “length” of this part of your port so that you can build your port to the target tuning length. Instead of using the diameter of your kerf arc, use the diameter of the arc that is the centerline of the port).

Step 5:
Now that you have marked off where your kerf will be on the mdf you are going to take your “length of kerf value” and divide it by 12. This will give you your length between cuts.



Now in the video I show a trick for making these divisions perfect. That way if your value is something like .6384 you don’t have to guess on a tape measure. My method is also much faster as it doesn’t require this steps math. Once you have marked out all the distances between cuts you can proceed with cutting and making your kerfs!

Other notes: These are other notes that have been brought up on other forums and I feel are helpful.

I made the mistake of wearing gloves in the video. Never wear gloves with rotary tools!
It is not recommended to apply screws in the kerfed section of the mdf, it will likely split, instead use clamps (or heavy objects) and wood glue.
If you are blade in not 1/8 you will need to do some math to determine how many cuts to make. I generally remove an inch and a half of material, so if your blade is smaller, more cuts, wider, less cuts. Note that fewer cuts will lead to a rougher curve and more a smoother curve but with less strength.

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PostSubject: Re: Kerfing MDF   1/12/2012, 3:18 am

it looks SSOOO easy but when you try it. its not lol. you need the blade depth and the width between cuts perfect.
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PostSubject: Re: Kerfing MDF   1/29/2012, 6:00 pm

here is the way I prefer to do it.











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