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    Issues milling16ra finish in 440c.. Is G8 helping or hurting me?

    I have a pretty challenging part in front of me where I need my process to be very dialed in, and very stable (400pc order). maybe someone has come up with something clever that could burnish in a mill? The part has a critical contour that sort of looks like a parenthesis "(", maybe 1.5 inches...
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    Linear bearing shaft quality requirements

    I had posted this in the Automation and Robotics forum, but I realize this is more a general question. Perhaps this forum could get a wider audience to help me out. See this thread > http://www.practicalmachinist.com/vb/robots-and-automation/linear-bearing-shaft-quality-requirements-326331/...
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    Linear bearing shaft quality requirements

    I have a linear motion setup that I am building for a 3d printer I've designed. I'm using misumi recirculating bearings of the 12mm variety. (MISUMI USA: Industrial Configurable Components Supply) I'm running them at very low speed and low load on 12mm hardened, chromed precision linear...
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    Full tilt spindle speed, damaging or not?

    I have a VF2ss that I like to run at 12k for extended periods of time through a long cycles, think 70% of a 3 hour cycle, with parts running one after another for 12 hours a day. I have heard from many people that running a machine at full tilt spindle can be bad for the bearings and the...
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    3D printing fixtures. Surprisingly effective for small run work.

    So this past week I tried something new out. I have a couple castings I machine a few features on, you can read more about them here: http://www.practicalmachinist.com/vb/general/how-should-i-hold-these-castings-278570/ This time around it's a new rev of the casting, same general swoop shape...
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    Machining gears on a 4th axis, how feasible is this?

    I may have to make some simple spur gears because our current vendor seems to be backlogged to high hell. I have a decent idea how I will do this, but I could certainly use some insight, as I have never really made gears, and I imagine there's a lot about them that I dont yet know. The gear...
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    How do you find center of a 4th axis on a VMC?

    Trying to figure out how to best find the location of the rotation axis on a 4th axis rotary mounted about the X axis.. The more I learn about 4th axis machining, the more I realize having your work offset precisely on the axis is really important (especially parts that require complex 3D 4xis...
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    Told I need to quiet my machines down. Any good quiet endmills out there?

    So my shop lies right on the other side of a wall with a bunch of software programmers, and apparently they've finally gotten a little fed up with the noise (It's been a little over a year since the company started this shop). I've been tasked with the challenge of being compassionate, and...
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    Sometimes you gotta do what you gotta do. I call it P suck.

    was machining through some glass filled ceramic and didn't feel like seeing that dust in my coolant or anywhere grit doesn't play nice. I need a better shop vac too.
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    Difference in AL specific coatings leads to chatter in aluminum.

    I have some fairly easy parts that I have talked about before on here. 3 x 1.3 pocket, 4 inches deep in 6061, pretty rigid workholding between a 4th axis and a tailstock. I have ran these parts for a while, and recently got an order to make a couple hundred more of these, so I figure I had...
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    Trick to deep pocketing?

    I run a couple parts with a deep pockets (5x diameter), and they turn out alright, but there's a couple points in the toolpath that absolutely scream.. but because a finish pass takes off the chatter next time around it is "acceptable" but I'd like to know if there's any obvious tricks I could...
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    Fixing threads in 17-4, tell me everything you know about roll form taps please!

    Long story short, I have about 60 threaded holes in some 17-4 PH Stainless. They are M10x1.0, What they need to be is M10X1.5... Right now our engineers are looking at a few options to salvage these parts, I am going to be running some tests where I will be rerunning a tap down these threads to...
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    optical center finder?

    Hey guys, I might have a job coming up where I will have to locate a part off of a printed circle on a plastic label. I remember reading on here once about a jewelers tool which you could fit in the spindle of a machine, and it had a lens like a microscope coming out of the top that you could...
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    Double angle cutter in surfcam?

    I am trying to program a back chamfer cutter I just got in.. specifically this type of tool: I can't quite figure out how to program this tool, this tool type isnt supported in the standard library. I remember in Gibbs CAM you could just draw a profile of a tool, and select a rotation axis and...
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    How do you small shops organize your cutters?

    The title pretty much covers it, I am a fairly small 2 CNC mill shop, and I do a lot of aluminum and stainless, so I have roughly 2 different categories of tooling (high temp coated carbide, and aluminum/no coating). Over time I have accumulated all sorts of cutters for individual jobs, and...
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    Newish vf3 can't hold location of .001, HFO says it's twisted. does that make sense?

    I am wondering if someone can shed some light on an issue I seem to be having with one of our fairly new Haas VF3ss (1 year old) We have 2 identical VF3ss machines, purchased about 6 months apart, and I have noticed some inconsistencies with the repeatability of the “older machine” as compared...
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    New VF-3 putting wrong tools in the spindle?!

    We have a 2013 Haas VF3 SS that just did something very scary today. I was cutting some soft jaws, I ran the program and everything looked fine, both tools came out in correct order and everything worked as it should. Once it finished I took a look at the jaws, comped the first tool T13 (.500...
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    How should I hold these castings?

    I have about 100-200 of these aluminum castings to machine over the next year or so. I have to machine 4 features; Face the flat location where the 3 ribs meet On the flat face I machine, in the same setup, I will drill 3 holes in each of the the reinforced rib areas I will need to flip the...
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    Stuck with Surfcam, REALLY need new CAM, any suggestions?

    I manage a brand new prototype shop in house for an engineering company. We opened our shop's doors about 6 months ago, at the hands of a machinist who decided to quit about a month ago. I inherited all of the decisions he made in which machines, CAM, tooling, etc.. about 2 months ago when I...
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    Seems simple enough, but it CHATTERS!

    I have a long deep pocket, 1.3"x 3.5" by 4 inches deep. 6601, pretty standard stuff.. The pocket has straight walls all the way to the square bottom. There are a few bosses to contour around, but generally nothing too intrusive. The issue comes from the setup. This part is fairly complicated...
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