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  1. #1
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    Default Make an impression

    This is probably more related to QC, but I wanted to send out a feeler
    on what folks like for making impressions to measure. Like for internal
    grooves, radius features, etc. Features on parts hard to probe, and
    an impression, on an optical comparitor can bring those details to prevelant
    "light".

    In the old days we used a sealing wax like substance that we melted with
    fire and stuffed it into the cavities to be measured. And also I have used
    a silicone like substance that was mixed together like 2 part epoxy glue.

    What I'm looking for are some sources for the epoxy/silicone substance as
    it made excellent impressions. Like the PVS stuff dentists use.

    Any info on this would be appreciated...

  2. #2
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    Default

    There is a product made by flexbar called reprorubber. It is flexible but very dimensionally stable. Theoretically (they claim) that it is repeatable to your part within something like .00002. I have used it with good success in snap ring grooves, etc. This is actually where this product is great cause it will flex and release. It is not stable enough to probe, but you could measure it on a comparator or any vision system.

    EDIT* it is a two part epoxy like substance. It has a base and a catalyst. It is very easy to use and mix. Also, there is a putty type.
    Last edited by Paragon_R_N_D; 11-03-2008 at 08:55 PM. Reason: added information

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  4. #3
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    Default

    Exaflex

    Normally use the yellow..or some times the blue..different viscosities.

    http://www.gcamerica.com/gcvinyl.html

  5. #4
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    Default

    I'm not positive about it but the exaflex and reprorubber are very closely related. Possibly the same manufacturer that makes both or something. That's interesting how close they are.

  6. #5
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    Default

    [QUOTE=Titanium;995688]This is probably more related to QC, but I wanted to send out a feeler
    on what folks like for making impressions to measure. Like for internal
    grooves, radius features, etc. Features on parts hard to probe, and
    an impression, on an optical comparitor can bring those details to prevelant
    "light".

    You are looking for a product called 'Dental Wax'. I have used it for rough measurements of hidden features, and then used the Repro Rubber stuff if the tolerance is close.

  7. #6
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    Default

    Exaflex is great. We also use a dental product, looks like a hard brown crayon. U light it with a match and it gets gooey, then hardens up in a few seconds. You can also use the same piece over and over for years, that's why I don't remember what it's called.

    For something real fast and simple, we use silly putty

  8. #7
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    Default

    Quote Originally Posted by PLASTIFORM View Post
    Please view and spend a few minutes on this website , you will see that pertinantes solutions exist.
    APPLICATIONS

    You're not making a very good impression.12 posts and they are all spam!

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  10. #8
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    Default

    Hello, I just read this post and I'm surprised to see that this technique does not seem widespread in the US.
    In Europe, this technique is widespread and technically approved by many big names in the industry.
    Plastiform is marketed and distributed all over the world today.
    Maybe this post is too old ;-)

  11. #9
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    Default

    Quote Originally Posted by M.C.E. View Post
    Hello, I just read this post and I'm surprised to see that this technique does not seem widespread in the US.
    In Europe, this technique is widespread and technically approved by many big names in the industry.
    Plastiform is marketed and distributed all over the world today.
    Maybe this post is too old ;-)
    Hello, I just read this post and I'm surprised to see that each and everyone of your recent posts, says the same fucking thing.

    Link>>http://www.practicalmachinist.com/vb/general/suggestions-house-rubber-molding-material-prototyping-331814/#post3137662

    Link>>http://www.practicalmachinist.com/vb...9/#post3137661

    Link>>http://www.practicalmachinist.com/vb...4/#post3137655

    Each and every one an old post about plastiform, dredged up.

    You wouldn't happen to be a spammer by any chance? Just saying.

  12. #10
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    Default

    Quote Originally Posted by machtool View Post
    Hello, I just read this post and I'm surprised to see that each and everyone of your recent posts, says the same fucking thing.

    Link>>http://www.practicalmachinist.com/vb/general/suggestions-house-rubber-molding-material-prototyping-331814/#post3137662

    Link>>http://www.practicalmachinist.com/vb...9/#post3137661

    Link>>http://www.practicalmachinist.com/vb...4/#post3137655

    Each and every one an old post about plastiform, dredged up.

    You wouldn't happen to be a spammer by any chance? Just saying.

    Phil, You've fucked up and need to go deeper a bit!
    That's only 3 posts and he's got a count of 5!

    Now go and do your homework to find the missing 2 !!!

    ( Though I do give him some credit for spamming sustainability! )

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  14. #11
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    Default

    Every serious shop I've been in uses Reprorubber.

  15. #12
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    Quote Originally Posted by SeymourDumore View Post
    That's only 3 posts and he's got a count of 5!
    I audited the other 2 posts, 06-29-2016 and 06-30-2016. They seemed innocuous enough. That's why I said recent posts. His first two were late June 16.

    link>>http://www.practicalmachinist.com/vb...3/#post2790263

    link>>http://www.practicalmachinist.com/vb...1/#post2790291

    Almost like his account has been hacked by the Plastiform Mafia. I've heard that's a big problem in Mauritius. The Play Doh police don't stand a chance, against this evil empire.

    Interesting side fact, the internal search of members here often glitches when the name contains periods. M.C.E., when you click his profile, it brings up a totally different member. mce6062's from Lake Dallas, Texas.

    I hope that bloke will forgive me for ripping him a new arse hole. (/joke)

    Regards Phil.

  16. #13
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    Default

    Quote Originally Posted by mhajicek View Post
    Every serious shop I've been in uses Reprorubber.
    I guess the less than serious shops use Silly Putty?

  17. #14
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    Quote Originally Posted by Larry Dickman View Post
    I guess the less than serious shops use Silly Putty?
    The really silly shops use a condom and a squirt of Ex-pando foam in a can. Just remember to reduce your numbers by half a thou.

  18. #15
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    Default

    Personally I like Cerrosafe. Not exactly RoHS compliant but quick and accurate.

  19. #16
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    Default

    Quote Originally Posted by Larry Dickman View Post
    I guess the less than serious shops use Silly Putty?
    Less serious shops just ship it. They don't stay in business very long.


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