Ball Park Estimate for Custom Hex Aluminum Standoffs - Page 2
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  1. #21
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    Appreciate all the input, please feel free to keep it coming. I'll update the thread when I get info on the quotes that are out there. The quoting stuff is being handled by the client but I will let them know about the quantities/cost Dan mentioned.

    Again, priceless info from the experts. Thanks again.

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    Quote Originally Posted by BugRobotics View Post
    These lengths and threads are required to interface with existing assembly.
    Odd requirements . reminds me of those fasteners with metric threads but SAE sockets. Almost but not quite. Not a criticism, but designers sometimes are just stuck in a rut and unwilling or fail to simplify things. Hope you can make the standoffs economically in small quantities.

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    Without knowing exactly what the parts look like before and after, could you make up a form tool for each size? Maybe that would cut down on the time to make the parts?

  5. #24
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    Quote Originally Posted by dcsipo View Post
    Odd requirements . reminds me of those fasteners with metric threads but SAE sockets. Almost but not quite. Not a criticism, but designers sometimes are just stuck in a rut and unwilling or fail to simplify things. Hope you can make the standoffs economically in small quantities.
    Just to be clear these are metric standoffs with metric threads. This is more a case of two assemblies, one which the client has zero control over, that have to fit in a pre-defined space. The spacing between the two assemblies (PCBs and a few mechanical components) are controlled with existing standoffs that supported items that are no longer part of the assembly. The standoffs I inquired about take the place of the removed components to support the client's parts. Takes me about a minute to modify the standoff plus another 5 minutes to treat the entire batch with Alodine. Not a big deal at all in my opinion given the roughly 100 parts/year need.

    Not talking about the 39mm length for a moment, one could argue that the 0.2mm difference between 12mm and 12.2mm is of no consequence and I'd absolutely agree in this case. The client wanted to reduce BOM costs and standardize on a single screw size (M3) in this case and that required modifying an M2.5 standoff with an M3 thread. Might as well take the extra 15 seconds to part it to length before tapping to size. The 39mm standoff was decided upon as a standard 38mm length puts a bit too much strain on the assembly.

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  7. #25
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    Quote Originally Posted by Mtndew View Post
    Without knowing exactly what the parts look like before and after, could you make up a form tool for each size? Maybe that would cut down on the time to make the parts?
    Yea, should have shown the parts instead of attempting to describe. Here is a pic of the type of standoff I'm modifying.

    98952a111p1-j08-digitall-1x_636874378414511927.png

    Operations is as follows:
    1. part to length (usually taking about 2mm off)
    2. deburr
    3. drill to 2.8mm (M3 form tap drill)
    4. clamp batch of standoffs between two parallels and form tap with Procunier
    5. treat batch with alodine

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  9. #26
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    Quote Originally Posted by BugRobotics View Post
    Yea, a quote is out to RAF, the outfit who already supplies to Mcmaster for the specific parts. We will see what they say. Most times in the past they want a few thousand units (which makes sense). Just not sure the client wants to pay for that amount right now.
    Thing is, 1000 pcs might be less cost than 100 pcs hand modified, or at least they would be if I was doing it....


    RAF hafta remember that

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    And I think, Mcmaster will get anything you want if you buy a minimum, basically create a Mcmaster part for you. Sure they are calling RAF, and adding markup.

    As time goes on they impress me more and more.

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    Quote Originally Posted by BugRobotics View Post
    Operations is as follows:
    1. part to length (usually taking about 2mm off)
    2. deburr
    3. drill to 2.8mm (M3 form tap drill)
    4. clamp batch of standoffs between two parallels and form tap with Procunier
    5. treat batch with alodine
    Hardinge DV-59 and a girl who can't afford a bra to run it.

    And a divorce lawyer for when the wife drops by the shop unannounced

  13. #29
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    Quote Originally Posted by gustafson View Post
    And I think, Mcmaster will get anything you want if you buy a minimum, basically create a Mcmaster part for you. Sure they are calling RAF, and adding markup.

    As time goes on they impress me more and more.
    Cool Mcmaster story from about 8 years ago...

    I had a pipe inspection robot prototype that needed to go out the next day for a last minute proposal. Placed a Mcmaster order the day before with overnight delivery. All the parts arrived except one (small air valve maybe worth $75). Called up Mcmaster and let them know. I started machining the necessary components. About 3 hours later, I get a knock at the office. Mcmaster had a courier hand deliver the part to my door Ball Park Estimate for Custom Hex Aluminum Standoffs. I'm located in Denver so that was a quick plane ride. I love Mcmaster.

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  15. #30
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    Quote Originally Posted by EmanuelGoldstein View Post
    Hardinge DV-59 and a girl who can't afford a bra to run it.

    And a divorce lawyer for when the wife drops by the shop unannounced
    Quote Originally Posted by BugRobotics View Post
    Cool Mcmaster story from about 8 years ago...

    I had a pipe inspection robot prototype that needed to go
    Is this sequence of posts permissible?

    dee
    ;-D

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  17. #31
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    Quote Originally Posted by dcsipo View Post
    Is this sequence of posts permissible?

    dee
    ;-D
    absolutely not


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