TM51,
It's obvious now that my typical verbosity and subtle intentions (Weirding Ways of the Bene Gesserit - Dune) to what I wrote were missed or misinterpreted by your response. I did find Franks addendum to his post
most rewarding though, which brings me to a story similar but backwards from his, of the last time I was
concerned.
In my last 12 year run in Corporate, we had a 25 year machinist (an HP transplant). Nice guy and I respected him and what he could do for 3-4 years. He also taught me a lot about setups, sequence of ops, Cam and what he did to get stuff to the machine. I worked pretty diligently at giving him all he needed to do some of the jobs we had and for some of the 1-2 off R&D stuff I did. Even lobbied and for him to get things for his shop (like a new knee mill) and bought tools from my budget for his shop. He and I became pretty good friends. He knew that I was pretty good with computers and had some trouble with his at home. Invited me over for dinner with him and his wife a few times. His wife was a quilter and because I wouldn't take any money for the help I did for them they presented me with a beautiful king size quilt she made...still have it and cherish it.
I was engineering manager by then and was out in the shop dropping off some stuff in sheet metal (A real wizard there) and doing my usual check in with people and stopped by to check in with him. He was doing a job on some explosion proof housings for a product we made in several varieties and had that look. We had an old Mori Seike that he didn't like because he had better stuff at HP. We had put a new spindle and bearings in it a few months back and was there when they finished up and ran the test runs on it...it was dead on to about 3 tenths. The fixture he was using only did 2 off and required the 4th axis for some of the ops, and was pretty tired and I really didn't like the way it held the parts. We chatted about what was happening and I looked up and saw the 55 gallon drum scrap bin was full of these housing. These are ~$300 per castings...so that was probably about $8-$10k worth...Oh Crap! The bad thing was they had a pretty long lead time so we bought about 100 at a time for price and to have them...and this was a pretty big order of 25 IIRC...and I had about 14 balls in the air at the time, with a new fire drill.
The short of the production run was that we came up some better hold points that held it tight and found he had changed his touch of point to a place he found easier to work from...but was not part of the internal or already machined point that we received from them. Got them out the door on time but it was a row to hoe!
After it was over I said I was going to talk to the vendor and get the actual casting/machine drawings for them and design a 6 off fixture that would lock them in properly and allow it to work better with the fourth axis. Also my guys and I went over the assembly drawing with a fine tooth comb. Luckily I/we had a pretty good relation with the supplier and after a chat with the owner we got copy of their latest drawings. What I noticed was they used Geometric Tolerancing on theirs, but mainly it was the casting tolerances I wanted. I had talk to our guys before as I had done quite a bit in the past and they poo-pooed it, so we didn't much other than concentricity and a few others once in a while. Bottom line was, I designed a killer fixture with his help and we did update our drawings with some Geometric Tolerancing because it was prudent!
About 6 months later I was out in the shop again and stopped by to check in and here he was doing them on the old 2 off fixture I thought had gone in the scrap bin or re-purposed. When I ask why, he said he only had a couple to do and it was easier. I Looked at the bin...nope...Ok, and said why aren't we building these bases for stock...Oh So and So dropped the order off. I had worked with Inventory to make sure we had these on hand and what the refill levels would be. Checked with Inventory and someone had bypassed the refill min levels. The worst part was of this ClusterTruck was that 6 off $2k fixture that worked perfectly because I was there when we ran it, sat on the shelf and he eventually told me he hated Geo-tolerancing. All I could say was You worked for HP for Blinking sake on tiny BeCU parts and how could you do that without Geo-Tolerancing...the program files were already written...it became clear.
That we pissed away $10-$12K in material and all the time and effort to help out and do it Right, was about the last time I was
concerned. Except that he had dropped a foot long log of 4" brass on his foot about a year after the incident and left on disability and never came back...that
concerned me too...because I liked him actually.
P.S. Vexus is the title of a book I started years ago about what Vexes Us...never finished it and finally realized it's probably an encyclopedia instead of a book. Add to it once in a while...who knows...my kids might get something from it.
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