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Posted by D Murphy on May 20, 2008, 1:15 am
Please log in for more thread options
> posted to both amc & rcm
>
> For our money players in AMC
>
> How much are you using the traditional square ground lathe tool
> bits? If you are, are you using M2, M2Al, 5% or 10% cobalt? Do
> you hand grind, or use a surface grinder w/fixtures or
> attachments, i.e. radius dressers? Also for what purposes, e.g.
> special form tools, special threads such as acme or buttress,
> general machining where the material damages high $ carbide such
> as excessive scale or inclusions?
Pretty much never use them. They simply aren't cost effective on the type
of equipment we have. Even if they were free.
In fact, we use mostly carbide for drilling as well. The exception being
small holes in brass and aluminum where the SFM can't be acheived.
Our least expensive lathe is $150,000.00 well equipped and ready to run.
The most expensive can cost over $500,000.00. Figure the dollars per hour
you need to generate and you can't afford to be messing with HSS, it's
too slow, too labor intensive, and doesn't perform. We rarely use brazed
carbide, and almost never use uncoated carbide inserts except for
aluminum. But even in aluminum it would be a highly polished special prep
insert. If there is sufficient SFM and the job is higher volume, PCD
would be the 1st choice for Aluminum.
This is all on higher end CNC Swiss type and conventinal fixed head
lathes. If I were running an engine lathe at home HSS would be my first
choice. HSS really has few applications in the real world anymore. At
least not on high performance CNC lathes. In the tool room you could
probably make a case for it though.
We have a Nardini 14x40 in our "tool room" (I use that term loosely) and
I was turning out some bushings a few weeks ago using an insert tool. I
was using an insert tool mainly because we have loads of them along with
all the inserts you could ever want. As the red hot chip were pelting me
I thought I either have to get one of those plastic sheilds on a magnet
or buy a HSS tool or two.
Speaking of hot chips, I set our booth on fire at a trade show in Mexico
City using a carbide insert tool on a big engine lathe. The guy
demonstrating the Harrison lathe had to leave early and I stepped in and
did a few demos on it.
One customer was concerned about rigidity. To show the rigidity and power
of the machine I stood a nickel up on edge on the compound, took a 1/4"
DOC at a 0.015" or 0.016" per rev feed rate. I was running around 750 SFM
in 1018 steel using an insert tool. The chips were flying off like
popcorn. The nickel didn't move or tip over. The customer was impressed
and after the cut as we were standing there chatting and I smell
something burning and my feet are getting hot. The carpet was on fire. We
got it put out but not before it made lots more smoke and stink.
The guys running the show weren't real happy.
--
Dan
CNC Videos - <http://tinyurl.com/yzdt6d>
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Posted by J. Nielsen on May 20, 2008, 3:42 pm
Please log in for more thread options On Tue, 20 May 2008 09:18:02 -0700, Matt Stawicki
>HSS tools are the first choice for cutting Teflon. Much tighter grain
>structure than carbide, which allows a sharper edge that will cut it
>cleanly and reduce Teflon's tendency to move around. Only way to go.
Modern ultra fine micrograin carbide will hold an extremely sharp edge.
--
-JN-
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Posted by Gunner on May 21, 2008, 4:34 am
Please log in for more thread options Anyone have any Stellite they would care to sell me?
Gunner
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Posted by David Billington on May 21, 2008, 8:02 am
Please log in for more thread options Gunner wrote:
> Anyone have any Stellite they would care to sell me?
>
> Gunner
>
Can you not buy what you want. I bought some Stellite, can't remember
the grade, for cutting blade edges a few years ago. The UK depot is
about 30 miles from me.
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Posted by Randy on May 21, 2008, 9:14 am
Please log in for more thread options On Tue, 20 May 2008 11:31:47 -0500, F. George McDuffee
>On Tue, 20 May 2008 09:18:02 -0700, Matt Stawicki
>
>>On Mon, 19 May 2008 12:16:54 -0500, F. George McDuffee
>>
>>>posted to both amc & rcm
>>>
>>>For our money players in AMC
>>>
>>>How much are you using the traditional square ground lathe tool
>>>bits? If you are, are you using M2, M2Al, 5% or 10% cobalt? Do
>>>you hand grind, or use a surface grinder w/fixtures or
>>>attachments, i.e. radius dressers? Also for what purposes, e.g.
>>>special form tools, special threads such as acme or buttress,
>>>general machining where the material damages high $ carbide such
>>>as excessive scale or inclusions?
>>>
>>>For everyone
>>>
>>>If you are using square ground tool bits, how much difference [if
>>>any] can you tell between the generic import M2, the domestic M2
>>>and the newer alloys like M2Al, and the 5/10% cobalts?
>>>
>>>Specifically is the Armstrong M2 tool bit worth 3X to 4X [or
>>>more] than the import M2, or is this another "Starbucks?"?
>>>
>>>Does anyone know if the "domestic" M2/M42 tool bits are actually
>>>made in the USA from "Mercan" steel, or are these just import
>>>M2/M42 tool bits repacked with a "made in USA sticker" on the box
>>>and a higher price tag?
>>>
>>>Also, I am in the process of ordering some 3/8 and 7/16 bits for
>>>my new shaper. I am shocked -- shocked by the jump in M2 prices
>>>from the last time I bought [for some suppliers > 250%]. Are all
>>>HSS tool prices rising like a rocket?
>>>
>>>
>>
>>HSS tools are the first choice for cutting Teflon. Much tighter grain
>>structure than carbide, which allows a sharper edge that will cut it
>>cleanly and reduce Teflon's tendency to move around. Only way to go.
>>
>>Tantung G from VR Wesson is the best I've found so far.
>>http://www.agivrwesson.com/tantung.html
>>
Used it many years ago, tough to grind, I'd follow the grinding
suggestions on the above web site.
Tantung and Stellite are either similar or the same, as both are cast
alloys.
Thank You,
Randy
Remove 333 from email address to reply.
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>
> For our money players in AMC
>
> How much are you using the traditional square ground lathe tool
> bits? If you are, are you using M2, M2Al, 5% or 10% cobalt? Do
> you hand grind, or use a surface grinder w/fixtures or
> attachments, i.e. radius dressers? Also for what purposes, e.g.
> special form tools, special threads such as acme or buttress,
> general machining where the material damages high $ carbide such
> as excessive scale or inclusions?