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Recent content by Cha0ticBliss

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    Old Sheffield 9.9.7 Retrofit w/ New Renishaw Hardware vs New CMM.. Thoughts?

    Thanks for the suggestion. Hadn't occurred to me that a pre-check might be a good first step. After discussing with a few folks about it, ended up deciding to go with a new CMM instead of the retrofit. We have enough room for 2 CMM's in our QC lab, so at the end of the day it seems to be the...
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    Old Sheffield 9.9.7 Retrofit w/ New Renishaw Hardware vs New CMM.. Thoughts?

    Debating on whether on not CMM retrofit is a good option for our current set-up Our existing CMM is a 2004 Sheffield 9.9.7 CMM with PC DMIS. Support and availability of replacement boards for our machine is becoming scarce so we are looking to upgrade. I had originally been resigned to buying a...
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    Flatness problems on 6061-T6 aluminum

    Luckily the customer's spec on the material prevents us from getting anything from Russia, but not sure exactly where the material is sourced. (Cert says melted in US OR dfar compliant country) Most of the parts I work on are too thin to mount on 3 points. Having a 4 point mount + 1 in the...
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    Flatness problems on 6061-T6 aluminum

    Agreed, I've been considering skimming .100" off both sides, let it sit for a week or two, then machine op1 and op2 sides. I have had the most luck centering the part inside of the blank but ignoring the ribs while doing so. Seems that if the main "floor" of the part is on center, even though...
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    Flatness problems on 6061-T6 aluminum

    All of our material is DFAR compliant but the cert doesn't show what country it came from. (cert says material was melted in US or another DFAR compliant country) Seems like it is sometimes a toss-up between bar or plate. I the past I always was under the impression that plate was always...
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    Flatness problems on 6061-T6 aluminum

    Sorry for the limited info, was just trying to avoid a TLDR post where folks may not want to take the time to read through a page of info. For the part I am working on right now: -90% of the part is .100" thick -There are several thru holes and threads. 15% of the part consists of pockets...
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    Flatness problems on 6061-T6 aluminum

    I'm held to the customer's requirement for 6061-T6
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    Flatness problems on 6061-T6 aluminum

    Does anyone have any tips or tricks on maintaining tight flatness requirements on 6061-T6 (or T6511) aluminum? Parts are generally around 12"x 12" and at least .100" thick on the majority of the part. Most have pockets and or ribs so lapping is not an option for most. I normally see .002-.003"...
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    Looking for Input on Milling Hardened 440c (56-59RC)

    Out of curiosity, does anyone have experience/input on milling 440c after it has been hardened? Final hardness will fall between 56-59 Rc for the heat treat spec I am held to. Working on a job that has a tuning fork feature that is .600" long with a .300 +/-.001 gap in between. Since each prong...
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    The meaning of a size dimension

    No feature control frame required. Y14.5 calls out a feature of size as any directly toleranced set of opposing planes, diameter, etc. Here's an example from Y14.5 2009 that shows this as well.
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    The meaning of a size dimension

    Technically, per Y14.5 there is an implied flatness since the form of the part can't exceed the maximum material condition (MMC) of any feature of size. In your scenario, if part is made to low end of tolerance, you wouldn't see more than .0006" flatness on a part that is per print. Most of the...
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    Portable CMM Arm Hexagon vs Faro

    Even if they share a common base and the arm/part are fixtured completely rigid, there is still uncertainty whenever you take a reading with the arm. When you set the zero on a part that is a reading and there is uncertainty. One time you may go to take your zero and the arm with nail the...
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    bubble software

    I've been looking at demos and considering the High QA software as well. Might be kind of pricey if all you are looking for is a bubbling software, but the bubbling, inspection data management and feature recognition from High QA appears to be top notch Currently the company I work for uses...
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    Portable CMM Arm Hexagon vs Faro

    I've worked with a Romer arm. Here are some of the main points that I've come across. 1) When taking a measurement, the accuracy of your reading is at least 2x the positional accuracy of the machine. When you set your zero/datum, that accuracy of that can float +/-.008mm. When taking the...
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    +/-.0001 Dia Hole in Titanium giving me trouble

    I completely agree... If I knew the answer then I wouldn't be asking the question. The whole premise of the original post is that this is unfamiliar territory for me and I am looking for alternative options. I've been programming less than a year and this is my first time touching titanium so I...
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