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I just attemped and completed my first routed brass job. The smallest letters were 1" lower case and I had some problems with them. I did not purchase the brass, so I don't know how hard the material is. The brass is 3/16" thick and I used 3/16" dia. alum, cutting bits. I made four passes at feed rate of 40, spindle rate of 15k. I finshed the job at these rates but broke two bits at higher feed rates.
Please advise on how you might tackle this one...
-------------------- Chuck Reed CR Signs 10442 Cook Circle Huntington Beach, Ca. 92646 714.962.7805 CRSigns2@aol.com Posts: 14 | From: 10442 Cook Circle Huntington Beach, Ca. 92646 | Registered: Oct 2002
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brass is much harder than aluminum. and thus needs a slower speed.. also it clogs the cutter more. use some cuttin fluid...
-------------------- Leaper of Tall buildings.. If you find my posts divisive or otherwise snarky please ignore them. If you do not know how then PM me about it and I will demonstrate. Posts: 5274 | From: Im a nowhere man | Registered: Jul 2001
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I cut brass at 30 inches per minute and 18K RPM. For bits I use a 1/4" bit made by Onsrud. www.onsrud.com part # 63-620. It is a single edge upcut carbide bit that has a short length of cut so it is a good strong bit. Haven't broken one yet.
-------------------- TJ Duvall Diamond State Graphics, Inc.
New Castle, DE 19720 Posts: 396 | From: New Castle,Delaware | Registered: Jul 2002
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If it were me, I'd pull my Gemini catalog off the shelf and order water cut brass letters from them. The price is right and it saves me time and headaches. We use to use our cnc to cut metal and had good success. However the clean up was a pain in the butt and there are always frustrations like broken bits, flying spray (cutting oil) and such. I agree that if you are cutting your own brass you will need to slow the feed down quite a bit and make sure that you have a liberal spray of cutting fluid to keep the bit cool and the cut clean.
I still think Gemini is the way to go!! Good luck!
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