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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Drilling Phenolic
How do you drill clean holes in linen-filled phenolic?
I'll admit that I haven't tried it yet, but I'm thinking that if I use a regular twist drill it'll be chip city. It's 1/8" thick flat material, I'm planning on some 3/32" holes and some 1/4" holes. -- My liberal friends think I'm a conservative kook. My conservative friends think I'm a liberal kook. Why am I not happy that they have found common ground? Tim Wescott, Communications, Control, Circuits & Software http://www.wescottdesign.com |
#2
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Drilling Phenolic
On 12/20/2011 7:08 PM, Tim Wescott wrote:
How do you drill clean holes in linen-filled phenolic? I'll admit that I haven't tried it yet, but I'm thinking that if I use a regular twist drill it'll be chip city. It's 1/8" thick flat material, I'm planning on some 3/32" holes and some 1/4" holes. Brad-point or brad and spur drill bits. http://www.wlfuller.com/html/brad_point_drills.html |
#3
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Drilling Phenolic
On Dec 20, 5:08*pm, Tim Wescott wrote:
How do you drill clean holes in linen-filled phenolic? I'll admit that I haven't tried it yet, but I'm thinking that if I use a regular twist drill it'll be chip city. It's 1/8" thick flat material, I'm planning on some 3/32" holes and some 1/4" holes. -- My liberal friends think I'm a conservative kook. My conservative friends think I'm a liberal kook. Why am I not happy that they have found common ground? Tim Wescott, Communications, Control, Circuits & Softwarehttp://www.wescottdesign.com I've done some of that, if you use regular metal bits, it'll lift layers and chip. Best way I've found with the paper-based stuff is to use regular brad point wood bits at slower speeds, drill until the point just breaks through, then flip and drill back the opposite direction. Same as I do with hardwood plywood. Use a mask, it's not healthy to inhale the dust. Nasty stuff. Get good high-speed steel bits, carbon steel ones won't last long. It's sometimes hard to find ones that are marked HSS, they'll charge you the same price but slip you carbon steel ones. For most woodworking, the casual woodworker couldn't tell the difference. Stan |
#4
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Drilling Phenolic
"Tim Wescott" wrote in message ... How do you drill clean holes in linen-filled phenolic? I'll admit that I haven't tried it yet, but I'm thinking that if I use a regular twist drill it'll be chip city. It's 1/8" thick flat material, I'm planning on some 3/32" holes and some 1/4" holes. -- My liberal friends think I'm a conservative kook. My conservative friends think I'm a liberal kook. Why am I not happy that they have found common ground? Tim Wescott, Communications, Control, Circuits & Software http://www.wescottdesign.com Clamp it between 2 pcs of wood and drill thru the sandwich. This works a charm for plastics, fiberglass, leather, thin metal sheets, etc. Art |
#5
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Drilling Phenolic
"Tim Wescott" wrote in message
... How do you drill clean holes in linen-filled phenolic? I'll admit that I haven't tried it yet, but I'm thinking that if I use a regular twist drill it'll be chip city. It's 1/8" thick flat material, I'm planning on some 3/32" holes and some 1/4" holes. Small-ish pilot, then an endmill? Whatever method, do from both sides? Or sandwich each pc between wood, or sandwich a stack, well-clamped. High-ish rpm might help, 3K+. -- EA -- My liberal friends think I'm a conservative kook. My conservative friends think I'm a liberal kook. Why am I not happy that they have found common ground? Tim Wescott, Communications, Control, Circuits & Software http://www.wescottdesign.com |
#6
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Drilling Phenolic
On Tue, 20 Dec 2011 18:08:39 -0600, the renowned Tim Wescott
wrote: How do you drill clean holes in linen-filled phenolic? I'll admit that I haven't tried it yet, but I'm thinking that if I use a regular twist drill it'll be chip city. It's 1/8" thick flat material, I'm planning on some 3/32" holes and some 1/4" holes. You've got thin material that will ride up the drill unless clamped securely and backed up with sacrificial material. Might be okay with maximum spindle RPM (8000+ isn't too fast with carbide), particularly if you drill a smallish pilot hole first. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com |
#7
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Drilling Phenolic
In article ,
Tim Wescott wrote: How do you drill clean holes in linen-filled phenolic? I'll admit that I haven't tried it yet, but I'm thinking that if I use a regular twist drill it'll be chip city. It's 1/8" thick flat material, I'm planning on some 3/32" holes and some 1/4" holes. It's been a few decades, but it actually machines quite well. As the inexpensive, non-magnetic, reasonably strong insulating material of choice I used a LOT of in in various plasma-physics related work. Sharp tools - and carbide is a good idea, as it makes most softer tools dull quickly (but they will be fine if you're only doing a few holes and they are sharp to begin with.) 1/8" is a bit on the thin side. If you do have problems with drills, try end-cutting endmills, solid carbide, - if you don't have a mill, in a plunge router clamped to the work (get 1/4" shank endmills so you can find a router collet to fit.) -- Cats, coffee, chocolate...vices to live by Please don't feed the trolls. Killfile and ignore them so they will go away. |
#8
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Drilling Phenolic
On 12/21/2011 2:08, Tim Wescott wrote:
How do you drill clean holes in linen-filled phenolic? I'll admit that I haven't tried it yet, but I'm thinking that if I use a regular twist drill it'll be chip city. It's 1/8" thick flat material, I'm planning on some 3/32" holes and some 1/4" holes. Just try it with a normal drill. I won't be surprised if it works very well. I have never had any problem machining such phenolic plate, very easy material. No problems with chipping or delamination. The smell is easy to recognize too. Kristian Ukkonen. |
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