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  1. #1
    Join Date
    Mar 2008
    Posts
    17

    Need Help to find micro milling service shop

    I am working with microfluidic system for my scientific research and I need a metal master mold. The pattern of the master is like a stamp which has a couple of tiny bars on top a base. The width of the bar is 0.1mm and height is 0.5mm. I am thinking to buy a desktop CNC milling system but I am debating because CNC is not my major. Another option for me is to find a shop to do this. Anyone can help me to find a shop which has micro milling capability and also is willing to do small volume samples? I have different patterns to mill but for each pattern I just need very few samples. I am located in Chicago area. I am will to accept any reasonable price.

    Thanks a lot.

  2. #2
    Join Date
    Apr 2005
    Posts
    345
    what is the spacing between the bars? Can you post a sketch with tolerances and material requirements?

    Thanks
    Scott
    http://www.scpconcepts.com

  3. #3
    Join Date
    Mar 2008
    Posts
    17

    tolerances and material requirements

    The material could be any metal which could be easily milled, like: stainless steel, aluminum, copper or brass. The tolerance is like ±10% of the dimension in my drawings. I also attached my drawing.

    Thanks a lot.
    Attached Files Attached Files

  4. #4
    Join Date
    Feb 2007
    Posts
    162
    Quote Originally Posted by looking9 View Post
    The material could be any metal which could be easily milled, like: stainless steel, aluminum, copper or brass. The tolerance is like ±10% of the dimension in my drawings. I also attached my drawing.

    Thanks a lot.


    Stick with the brass.

    Is there a research machine shop at your university?
    Or one at a nearby University that you could use?

    I'm only asking because this is the type of work I've done with a medical school research machine shop and now with the engineering school machine shop. Sorry, I can't quote on outside work and we don't have a high speed spindle anyway.

    ...again, stick with the brass.


    Scott

    I can create a Solidworks model for you, no cost. version 2007.
    Some of my best finds were in the trash....

  5. #5
    Join Date
    Feb 2007
    Posts
    162
    I have a Solidworks model. I need to add the corner radius.

    here's a jpg.


    Scott
    Attached Thumbnails Attached Thumbnails brass master stamp.jpg  
    Some of my best finds were in the trash....

  6. #6
    Join Date
    Mar 2008
    Posts
    17

    Thanks, Scott
    I really appreciate your help on making me a Solidworks model. I will take your advice and stick with brass. And if you don’t mind, would you please tell me why brass is my first choice?

    A high speed spindle won't be a problem for me or at least I don’t think it is the crucial for my sample because in my mind, a high speed spindle can just make the mold better and a normal spindle can make it. I don’t expect to use the same machines listed in the literature. I just want the mold to be made.

    Pang

  7. #7
    Join Date
    Jan 2005
    Posts
    15362
    Hi looking9

    what are the corner Radiuses needed & it depends what you want to do with it
    as to what material is needed
    Mactec54

  8. #8
    Join Date
    Apr 2005
    Posts
    345
    你是中国人吗? 我看了你的名字。 我只好奇了。。。。。
    http://www.scpconcepts.com

  9. #9
    Join Date
    Feb 2007
    Posts
    162
    Here's the models.

    Scott

    I have Edrawings of both also, posted below.
    You'll need the viewer from solidworks.com

    ...and zcases said:
    You are Chinese? I read your name. I just curious about the.......

    :-)
    Attached Files Attached Files
    Some of my best finds were in the trash....

  10. #10
    Join Date
    Feb 2007
    Posts
    162
    edrawings and models.

    You'll need edrawings (free) from solidworks


    Scott
    Attached Files Attached Files
    Some of my best finds were in the trash....

  11. #11
    Join Date
    Feb 2007
    Posts
    162
    Pang,

    If you are flexible with the sizes of the inside radius, it will be less costly to make. Say a inside radius of .25mm or .30mm would be a bit easier or even bigger.


    Scott
    Some of my best finds were in the trash....

  12. #12
    Join Date
    Mar 2008
    Posts
    17
    :rainfro:Yes, I'm Chinese.Good eyes. 是的,我是中国人。你的眼力不错。

  13. #13
    Join Date
    Mar 2008
    Posts
    17
    Hi,Scott
    Thank you very much for your edrawings and models. And are you Chinese too,because you can read Chinese?

  14. #14
    Join Date
    Feb 2007
    Posts
    162
    No, not me.

    I used Google tranlator.


    Scott
    Some of my best finds were in the trash....

  15. #15
    Join Date
    Apr 2005
    Posts
    345
    Sorry to hijack the thread. No - I'm not Chinese, but I have been studying your language for about 3 years now. I take any chance I get to practice.

    谢谢您!
    柯思高

    Thanks
    Scott (zcases)

    After all that, I can't help with the micromilling anyway. Unless as someone else stated the inner radii could be much larger..................
    http://www.scpconcepts.com

  16. #16
    Join Date
    Mar 2008
    Posts
    17
    Thanks, 柯思高. You are more than welcome to practice Chinese with me anytime you want.

    Pang

  17. #17
    Join Date
    Jun 2003
    Posts
    11
    Check out Kern. www.kernprecision.com

    They sell A very high end micro-machine and I believe they also do contract machining as well.

    Good Luck

  18. #18
    Join Date
    Mar 2008
    Posts
    17
    hsm400,
    Thanks for you suggestion. KERN is the CNC system which was used in the paper I cited. However I did not find any contractor information on their website. Anyone knows about their contractors in USA?

  19. #19
    Join Date
    Feb 2007
    Posts
    162
    Hi Pang,

    If you you are only making one or two of these, anyone with a 10K or 15K spindle should be able to make this for you using brass material.


    Scott
    Some of my best finds were in the trash....

  20. #20
    Join Date
    Jan 2005
    Posts
    15362
    Hi Pang

    I have not heard what corner radus you want this will determine who can
    do this you said they finished with a 25um cutter that is .001 dia approximate so
    just to get a cutter to do that at .5mm /.0196" deep will cost a lot of $$$
    a .6mm/.0236" & .8mm/.0314" dia ( these numbers are approximate ) is around $70/$80
    in carbide .2mm/.0078" would give just under .004" corner radus
    Mactec54

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