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Thread: Large End Mill for Bridgeport

  1. #41
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    Mystery metal it's not always saving money.. as far as machining goes.

  2. #42
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    Jun 2016
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    Quote Originally Posted by MrWhoopee View Post
    Here's a simplified cutting speed chart
    Is "Ally" aluminum in your table? Assuming it is, 1000-1500 SFM for an HSS tool is a bit ambitious.

  3. #43
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    Aug 2004
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    For me? A nice lil surfacer would be nice. Even a 1/4" HSS bit, not being pushed too hard.

    Oh yeah, scale that blank. JR

    Errr. I do have some insert mills. Not the point.
    My old yahoo group. Bridgeport Mill Group

    https://groups.yahoo.com/neo/groups/...port_mill/info

  4. #44
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    Sep 2011
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    Langley, British Columbia
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    Quote Originally Posted by vpt View Post
    ...I never put much thought into sfpm or cut speeds, I just kind of know what sounds and feels right...
    That's pretty much how I approach it. I tend to run my endmills at slower RPMs but with greater DOC and feed
    rates than what the numbers say you should be using. A lot of the charts I have seen are designed to work on
    larger, heavier machines. As soon as you start working with lighter machines any give or flex you introduce will
    have a negative impact on your tooling. Running at slower speeds but with higher rates of cut can actually
    remove more material per minute than what you can achieve by running them faster and at the same time you
    get much better tool life.

    In any case whenever I'm using HSS endmills I always use roughing mills if at all possible. Marching a 3/4" endmill
    through a piece of steel with a full width cut and a depth of 1" is always a very satisfying thing to watch...

    ...What is "cut speed"?
    I think it refers to surface feet per minute...
    Keith
    __________________________
    Just one project too many--that's what finally got him...

  5. #45
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    Quote Originally Posted by LKeithR View Post
    In any case whenever I'm using HSS endmills I always use roughing mills if at all possible. Marching a 3/4" endmill
    through a piece of steel with a full width cut and a depth of 1" is always a very satisfying thing to watch...
    Same here. And they'll talk to you or give a touch response through the crank. You can fell when the bit wants more or says ease-up a little.

  6. #46
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    Quote Originally Posted by CCWKen View Post
    Same here. And they'll talk to you or give a touch response through the crank. You can fell when the bit wants more or says ease-up a little.
    Works with power feed too. Once you've used a machine for a while it will tell you if it's happy with the
    combination you're using...
    Keith
    __________________________
    Just one project too many--that's what finally got him...

  7. #47
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    Apr 2012
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    Medford Oregon USA
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    I tried the 2" R8 Valenite facemill that uses SEET 42 inserts yesterday. I think the used inserts are a little beat up, but its really good at removing metal. I have had no problems since removing the rusty mill scale. I have ordered some new inserts for the face mill, but so far the plain old fly cutter with a sharp HSS bit leaves the best finish. I used that to do a final pass on most surfaces. I did order an odd ball fly cutter off eBay to try. Its made by Criterion and has 33 on the side. It uses two 3/8 bits vertically. It was only $10 and I figured anything Criterion probably has some thought put into the design. It was only the head so before use I have to source a shank, its the same thread as their small boring heads.

  8. #48
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    Mar 2005
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    Toronto
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    Quote Originally Posted by bborr01 View Post

    Does anybody use HSS router bits anymore. Not that I know of. If we buy carbide to cut wood why would we continue to use HSS for all steel cutting?
    I don't think the two are at all related, different cutting action, different abrasiveness, feed per tooth, cost per cutter (i.e. an end mill), cutting speed and so on
    .

  9. #49
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    Apr 2017
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    To the above post, and different Rake.
    We were taught in Schoolm 3 leading causes of end mill wear, first being most severe,
    1.....speed 2.....feed....3......depth of cut.

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