flush trim bit - Woodworking Talk - Woodworkers Forum
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post #1 of 3 Old 04-30-2009, 04:51 PM Thread Starter
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flush trim bit

I'll be cutting alot of 1/2 MDF to a design on a template. My plan is to use a 1/2" flush trim bit. I'm worried about the wear on the bits from the MDF. Is there a certain type of bit that is better for this, or just I just be prepared to possibly replace the bits as needed?


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post #2 of 3 Old 04-30-2009, 08:46 PM
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I would just use a 3 flute carbide tipped with a bearing. If you're careful and don't push the bit, a 3/8" bit takes out less material than a 1/2". When they dull, change out.

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post #3 of 3 Old 04-30-2009, 08:58 PM
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I am with cabinet man, I do a lot of pattern following, Call up the local machine shop suppliers, get a carbide fluted end mill, it is the same thing without a bearing, and they cost about 1/3 as much and are generally exceptional quality. Just use a bushing guide on your router. Also have one for ply, one for hardwood, and one for MDF, when the hardwood one starts to dull use it for ply, when that one is dull use it for mdf, when that one is dull sharpen and restart. MDF will dull a new bit fast, but a dull bit will still cut MDF well.

For cost comparison, a 3" end mill, 3 flutes, vented, up cut costs me about $43, same bit from CMT is about $135, and the end mill lasts longer, and is cheaper to sharpen.
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Last edited by scribbles; 04-30-2009 at 09:02 PM.
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