russ
New Member
Posts: 16
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Post by russ on May 14, 2019 22:57:33 GMT -5
Thanks in advance for any knowledge you may bestow on me...
Router was running at about 16,000 rpm and about 1/3 into the run the MDF started to turn dark (burn). I could smell it and it progressively got worse as the run went. It leveled the spoilboard fine, just severe discoloration. Here's a pic of the board and bit. The file I ran was the built in AR6SFC.MMG program.
Thanks Guys, Russ
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Post by gerry on May 14, 2019 23:43:48 GMT -5
It looks like a dull bit is burning the MDF. Are you running a router or a spindle? Are you SURE you're running @ 16,000 RPM. How did you zero the bit? As you run, the bit is getting more and more burned. I have the same bit for surfacing on a AR8Pro+, with the builtin AR8SFC.MMG, and it works beautifully.
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loren
New Member
Posts: 67
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Post by loren on May 15, 2019 7:10:34 GMT -5
I don't have this bit, but isn't 16k rpm pretty fast? I'd guess the chipload calcs would put it under 10k.
slower = bigger chips = less bit heat
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Post by Gary Campbell on May 15, 2019 7:59:51 GMT -5
Is it turning in the right direction?
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Post by Axiom Tool Group on May 15, 2019 8:04:38 GMT -5
I'm going to guess that the bit is an Amana RC-2250?
If so, then the bottom carbide cutters need to be removed when surfacing MDF.
You will use only the vertical knives.
Regarding RPM, we generally run these surfacing tools at 16,000-18,000. This is acceptable only because we are removing very little material.
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russ
New Member
Posts: 16
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Post by russ on May 15, 2019 10:55:16 GMT -5
I'm going to guess that the bit is an Amana RC-2250? If so, then the bottom carbide cutters need to be removed when surfacing MDF. You will use only the vertical knives. Regarding RPM, we generally run these surfacing tools at 16,000-18,000. This is acceptable only because we are removing very little material. Yes it is a RC-2250. I will take off the horizontal carbide cutters tonight, leave only the vertical ones on the bit and give it another pass and see what happens. Thanks for that info.
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russ
New Member
Posts: 16
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Post by russ on May 16, 2019 11:12:41 GMT -5
Worked like a charm. Got my spoilboard to pristine condition. Thanks Axiom for the helpful advice on that particular bit.
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russ
New Member
Posts: 16
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Post by russ on May 16, 2019 15:31:11 GMT -5
It looks like a dull bit is burning the MDF. Are you running a router or a spindle? Are you SURE you're running @ 16,000 RPM. How did you zero the bit? As you run, the bit is getting more and more burned. I have the same bit for surfacing on a AR8Pro+, with the builtin AR8SFC.MMG, and it works beautifully. It must have dulled mid-project because the bit was brand new. It worked fine once I took of the horizontal carbide cutters and just used the vertical knives as Axiom suggested. Just out of curiousity, did you remove your horizontal cutters on that?
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Post by gerry on May 16, 2019 16:07:54 GMT -5
No, and I don't see the need. But I usually do take a lighter cut than AR8SFC.MMG. If I remember correctly, I zero the bit, raise is 0.5mm, then set that as zero. On the 2nd pass I lower it the 0.5mm and set zero again and run it again. That bit does not like large cuts.
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