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Boring MDF Without Blowout
Question
Forum Responses
From the original questioner: Thanks for your feedback. I have already thought of that and slowed it down. From contributor I: I think the first question should be… Are you using a thru point bit or a brad (dowel) point bit? I have gone through 1" MDF many times in the past and never had any blowout. Sometimes a little chipping around the edges if the lance was getting a little dull, but that was the worst of it. From contributor J: Are you using a carbide-tipped or solid carbide bit? A solid carbide bit may be required. We have found that solid carbide bits work better. An alternative is to first bore the hole as usual, but leave 4-6mm of material. Then bore the same hole again as a through hole. That should greatly reduce the blowout, but it obviously increases the boring time. We have had similar problems with 1" MDF. We have tried every possible combination of plunge and spindle speed, but to no avail. Our thru-hole plunge works similarly to the way contributor M described.
From contributor I: We have always used carbide tipped drills. Another option would be to bore from both sides. This would guarantee no blowout, but it will increase your cycle time for each part. From contributor J: Perhaps more importantly, there is a big difference in geometry between the solid carbide bits and carbide-tipped bits. At least there was in those that we used. From the original questioner: We haven't tried the solid carbide. I need an 8 mm. Where can I get some? I knew you could get smaller bits in a solid carbide, but not larger bits such as 8 mm. From contributor J: Courmatt should have them. Did you ever try the solid carbide bits? From the original questioner: I have ordered them. I was very pleased with the folks at Courmatt - thanks for referring them to us. Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? Have you reviewed the related Knowledge Base areas below? 
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