M5 thread thru 2 inches deep HELPPPP! - Page 2
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  1. #21
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    Adjustment, no

    You use a longer screw, the added tapped depth is irrelevant

    making tools costs money, if you are doodling around your garage you can silver solder tools up, but when you charge a shop rate you are not doing your customer a favor by doing so.

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    Alright, two screws in the tap is a possibility although still rather long. I think the designer simply thought, a tap on this side and one on the other—let’s simply let it go through . . .

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    It seems that some modern thinking is that if the part does not fit the catalog cutter/tool then the part has to be redesigned. That thinking would be very limiting to manufacturing and design...IMHO.

    At my first job we had perhaps 30 guys making special cutting tools..My job was making one-ups and few-up cutters on a surface grinder. Still many such shops still exist.. later when working at a major manufacturer many if not most of the cutting tools were non catalog tooling..
    If the planned part needs an odd feature then some how it has to be made.

    Agree for a one-up or few-up special part features can be costly..and so can be the price of a one-up cutter. For example look at all the odd tool bits an old lathe hand might have used/made.

    special cutting tools - Yahoo Image Search Results

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  5. #24
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    Quote Originally Posted by michiganbuck View Post
    It seems that some modern thinking is that if the part does not fit the catalog cutter/tool then the part has to be redesigned. That thinking would be very limiting to manufacturing and design...IMHO.

    At my first job we had perhaps 30 guys making special cutting tools..My job was making one-ups and few-up cutters on a surface grinder. Still many such shops still exist.. later when working at a major manufacturer many if not most of the cutting tools were non catalog tooling..
    If the planned part needs an odd feature then some how it has to be made.

    Agree for a one-up or few-up special part features can be costly..and so can be the price of a one-up cutter. For example look at all the odd tool bits an old lathe hand might have used/made.

    special cutting tools - Yahoo Image Search Results
    Thing is, while everyone is getting upset about the design of this hole, taps to do it are readily available from plenty of places.

    Good quality spiral point tap with a small enough shank to pass the minor, it'll go straight through in one go as long as you can get oil/coolant/whatever down there.

    Here's one, Metric Fine Spiral Point HSSE Taps (TC854) | Cutwel - Machine Tap Specialist

    70mm o/a length, 3.5mm shank, decent brand, for the princely sum of £12.

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  7. #25
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    Nice taps! OTOH, I see this sort of job as an opportunity to make money. Price it as needed and if the customer questions why it's so expensive, explain why. They can either change it or not.

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    I have seen thread callouts like this before. The engineer needs to run a screw into the hole from both sides, but it really did not need to be tapped all the way through from one side. After discussing the function, we tapped the hole from each side with a regular tap and the part was perfectly functional.

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  11. #27
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    Quote Originally Posted by Philabuster View Post
    ...After discussing the function...
    That is the answer right there. Why waste time theorizing about the designer's intent or competence when you can find out over the phone?

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  13. #28
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    I always inquire about deep tapped holes like this. Over the years I find that the designer/engineer goofed and meant drill through and tap a standard depth or like Phil said it only needed to be tapped shallow from both sides. But once in a great while the engineer is a knucklehead and demands the deep threads for no real reason. That's when I jack the price up.......................

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  15. #29
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    Quote Originally Posted by Oldwrench View Post
    That is the answer right there. Why waste time theorizing about the designer's intent or competence when you can find out over the phone?
    Many times we are just too far removed from the designer, and the tier(s) above us are not overly interested in relaying our questions.

    This is when it is just best to quote it both ways and let the chips fall where they may.


    ------------------

    Think Snow Eh!
    Ox

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    With the thread for a set screw and full thread needed to to extract the screw is one reason for such design.....who knows.. only the guy who designed the part.. Suckering the customer for more than the cost to make, or more than just adding the cost to order a special tool is not smart.
    It is just another part IMHO.
    Do a job the fastest/best way and charge shop rate is. often the best policy to keep the shop healthy.

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  18. #31
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    Thanks for all the replies everyone, huge help. As a quick follow up for you all, due to some odd finishing requirements and the thread issue, combined with delivery requirements we decided this part wasn't going to be a great fit for us. One thing I've learned is its always better to say no than pay someone else to do their work.


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