Making a Depth Micrometer Rod anyone make one ?
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  1. #1
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    Default Making a Depth Micrometer Rod anyone make one ?

    Im missing a rod for a set and was just pondering trying and making one .
    Drill rod, thread the end make some nuts and then using guage blocks set it up. Im retired and not using it for a living so I dont see why not!
    Tell me why I shouldnt. Thanks

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    Give some dimensions of the rod you're missing. What brand is the mic?

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    I’ve already posted it in the want adds to no avail. It’s a 440 Starrett
    Missing the 5-6 rod .125 dia

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    Go Fer It!

    I wouldn't expect better than +/- .002" if you don't have a grinder to make the face perpendicular to the shaft.
    Might be a good learning experience either way.

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    Quote Originally Posted by Rstewart View Post
    Go Fer It!

    I wouldn't expect better than +/- .002" if you don't have a grinder to make the face perpendicular to the shaft.
    Might be a good learning experience either way.
    If you give me a lathe or mill, some duct tape and a rotary tool I'll get it flat enough you can't tell otherwise. Of course, you could make up a proper clamp and call it a toolpost grinder or a high speed auxilliary spindle, but what's the fun in that?

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    Why? One can be had from MSC for under 20 bucks.

    5 to 6 Inch, Micrometer Rod 86417243 - MSC

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    Be aware that the Starrett rod at MSC may or may not be the right length for the OPs 440. The rods for my 440A are very different than the one she measured for his 440.

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    I've done it -- and easily.

    Buy some drill rod in the right diameter. Cut to length and thread an end. Thread isn't especially critical -- just there to adjust. You"ll likely have to turn the adjusting nuts down a bit to fit inside the cap.

    Whether you harden the end is up to you. A 6" depth rod might not get used enough to be worth the slight effort. Make a lapping block (close fitting hole). I used diamond stones to get mine flat, then shiny flat. The block keeps the end at 90 degrees.

    From there your accuracy is all in the adjustment. No reason it shouldn't be better than .001".

    While you're at it, might as well make a 7" depth rod from the same stock. Or just save a long piece, already threaded for whatever strange depth measurement task the future might see. Just minutes to whack it off to length, polish the end, and adjust.

    If you have truly accurate 1-2-3 blocks, a couple of them stacked make a good setup for adjusting your 6" rod. Sadly, you'll need to check -- the cheap blocks and even some of today's brand names aren't made to tenths (or even thousandths) -- just gang-ground to match.

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    Thanks to all. Some good ideas.

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    I've made several rods for my depth mike. All started with ejector pins. Just find the local mold makers.
    JR

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    Just saw this. I have a few rods in a toolbox. No idea of the brand and lengths, I can check later when home from work.

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    Quote Originally Posted by JRIowa View Post
    I've made several rods for my depth mike. All started with ejector pins. Just find the local mold makers.
    JR
    Thanks for that, JR. I have a pile of ejector pins here, and I do need a longer rod for one of my depth mics....

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    I agree 100% with JR. They are very easy to make out of ejector pins with a v-block on a surface grinder. I made a complete set of 0-6" that are tapered for depth check of tapered ribs on molds. I just blued up the ends and ground the taper until there was about .030" of blueing left on the end. I didn't want to go to an extreme sharp tip due to damage/accuracy issues. They come in very handy.

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    Quote Originally Posted by sandiapaul View Post
    Just saw this. I have a few rods in a toolbox. No idea of the brand and lengths, I can check later when home from work.
    Thanks
    Length is 9.165 / Dia. is .125 / Across nuts is .215

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    Quote Originally Posted by JRIowa View Post
    I've made several rods for my depth mike. All started with ejector pins. Just find the local mold makers.
    JR
    No mold makers here , but thanks.

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    Sorry no 5-6" in my collection

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    Quote Originally Posted by sandiapaul View Post
    Sorry no 5-6" in my collection
    Thanks anyways.

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