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Forum Index : Microcontroller and PC projects : Designer who obviously has no understanding of manufacturing
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| PhenixRising Guru  Joined: 07/11/2023 Location: United KingdomPosts: 1954 |
 Tolerances a bit tight or what?  |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8904 |
You get that (or worse) all the time when you just accept the defaults for a new drawing. Those of us who have used CAD for a while don't fall for it. For a start it makes your drawing look horrible. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5182 |
My Dad was an engineer. In retirement, he got back into motorcycles. On more than one occasion, he's drawn up a bracket or plate he needed made, and I was first in line to source materials and make it for him. He drew up the part, all the measurements for me. But, it would be based some crazy material size like 7mm steel plate, or needed a length of 9.2mm steel rod. I had to explain that there is no such thing as 7mm plate or 9.2mm rod, he needs to design it based on available material sizes, like 6mm plate or 10mm rod. The typical engineer vs fabricator discussion. He once asked if I could mill thicker plate to 7mm. Its a bloody bracket to hold a GPS! In many industries the builder has to spend a lot of their time redesigning the engineers work to suit what material sizes are actually available. I've been involved in many meetings where new plans come through and we spend days fixing them so its can actually be manufactured without costing a fortune. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| al18 Senior Member  Joined: 06/07/2019 Location: United StatesPosts: 238 |
That’s a freshman engineering mistake! |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8904 |
Oh yes, been there... :) I was somewhat naive in mechanical engineering when I started designing control panels. I've had quite a few visits from the metal shop lads saying "we can't make it like this, will this work?". lol Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 5927 |
You make the piece with 1 relevant digit, and use a big hammer to make it fit. Volhout PicomiteVGA PETSCII ROBOTS |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8904 |
Yep, that's the way. The correct use of the percussive adjustment instrument. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 1954 |
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| mozzie Guru Joined: 15/06/2020 Location: AustraliaPosts: 383 |
G'day, This became more prevalent as less people with real world skills on the shop floor where allowed into the office. Part of my job over the years at several companies was as a "sanity check" on the engineers designs before they where finalized. It is amazing how often the need for a "strongly worded discussion" with someone who cannot see sense because they have never operated a lathe / mill / folder / guillotine / brake press / welder etc. Also trying to prove that something that works on CAD will not work in the real world for reason X. Not knocking most of these people, very smart and on a lot more money than I'll ever be, but a lot had very high skills in a very narrow area. Good to see the slot is for a 1/4 bolt Regards, Lyle. |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8904 |
It doesn't only happen on the practical side. The number of times I've had to change drawings so that they can be printed... When will people learn that you can hardly see yellow ink on white paper? I eventually changed the default yellow to a "dirty, printable yellow" on my machine. It wasn't difficult. Oh, and red is a dark colour that doesn't show up all that well on CAD systems with a dark background, but perhaps I'm being unfair on those who only use Mac systems. ;) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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vegipete Guru Joined: 29/01/2013 Location: CanadaPosts: 1179 |
Stuff like this is part of the fun and entertainment working with and guiding (university level) students. Add to this the joy of them working almost exclusively in metric, although much of materials in North America are dimensioned in inches. 7mm plate? No, but you can use 1/4 inch. Plus many have just learned about machine tools such as milling machines, so they are ready to mill the bajeesus out of slabs of, say, stainless steel to fabricate a prototype structure. We might explain that it will be expensive, time consuming and have a high probability of failing because the material will warp. Fortunately, _some_ of them learn... Visit Vegipete's *Mite Library for cool programs. |
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