Pete Oxenham Profile picture
Sep 28, 2024 21 tweets 10 min read Read on X
The Bird Saga Tell-All: Here's the story of how I got my first $300k+ PO and turned my little race parts shop into a 24/7 CNC production facility (w/ pics!)

Story involves big risks, air mattresses, overloaded circuits, overfilled chip bins, A+ friends, and an industry legend.Image
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October 2018 - My friend Scott posted on FB that he was looking for a CNC shop. I said "me!" and he told me I couldn't handle the volume (he was right).
Nevertheless I replied "when do you want me to start?"
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He sent me some prints, and the deal was - deliver 20 assemblies, if engineering approves, you get a PO.
Crap - these are mill parts. I didn't have a mill, just a millturn.
So, I called up my old high school teacher and asked if I could hijack their machines after hours.
Being the saint that he is, Dan Frank replied "whatever you need", so I brought some material over and knocked out these parts. I'd never run 5ax before, but f it - lets go!
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Packed everything in a suitcase and flew down. Checked my final prints and realized "oh crap, these need to be assembled".
Change of plans, Uber LAX>McMaster, McMaster>Starbucks for assembly
Here's a pic that a kind homeless guy took of me on the patio, for memories Image
Arrive at Bird. Having never worked with a company this big, I'm super shaky and sweaty (I still get this way), but luckily Scott was there. Engineering approved! "When can you start production?"
I headed out to go wrestle with the question "how the heck do I make these now?"
I called my sales guy (shoutout Keith) and said "Hey man, I'm about to get a massive PO to make parts on a machine I don't have, and I need it yesterday."
Instead of calling me a reckless idiot (I was), he got to work and found me a machine.
Now financing.. I'm 23 with no credit. Last year's business revenue was less than this entire PO, and the machine is $350k. There's no way.
So, Keith called up Bill Selway, the top dog, told him my story, and Bill said "Deliver the machine. We'll finance it if we have to"
Fast forward - Delivery Day! This thing is a freaking monster. Few problems - I'd never touched Fanuc and never run a horizontal, and we didn't have the power. We spent the next 4 days getting the machine set up into production.
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Our whole suite was on 100A. The machine wants 250. On top of that, our air compressor died as soon as we brought the Enshu online.
At this point, there's no going back so I asked one of my guys to go to Herc and rent a diesel air compressor. That thing sat outside the next four months and terrorized the industrial complex. 3 diesel cans a day.Image
As if we didn't have enough drama already, the battery that the Haas lathe needed to keep its memory alive died and the thing literally forgot who it was. The OEM battery is soldered to the board.
Dan Frank to the rescue again, we took a Haas battery replacement kit from the high school, plugged it right in, and reloaded the parameters.Image
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After plenty of drama, we were finally in production. On the lathe, we needed 23hr/day to meet prod goals. On the mill, it was something like 24.8hr. Basically - zero downtime.
We were running two parts in tandem. One of them, pretty basic. We could strip mill it to reduce cutting and loading time.Image
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The other was a trip. OP10 was on the lathe, then for OP20 they were held by straps for the horizontal to machine the front and back in one setup. Mind you, this was my first time running a horizontal so I was in the thick of it, machining in front of and behind the tombstone where you can't see.
Our schedule was as follows:
5AM - John starts, takes over production
8AM - Donovan (assembler) starts
10AM - Ryan starts
6:00PM - Freight truck shipment of daily output
6:30PM - Ryan leaves, I run the shop until 5AM when I hand back off to John
Loop for ~3 months

Air mattress in the back room for pete to sleep from 6AM to 10AM
Evan and Cole handle ops during Pete's sleep time, Evan is the only one allowed to wake up PeteImage
About the chips - As you can imagine, we were making a LOT of chips. We called and asked our recycler for 3-5 more bins and weekly pickups. They no-showed.
We filled every possible receptacle to the brim, so I had to say screw it, we can't stop, chips are going on the floor now

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About the lathe - The Haas ST10Y is not really built for what we put it through, but man, that thing is a CHAMP.
It got to the point where sheet metal was falling off of it and I just said "put it in the pile, keep production running". We even crashed it twice and it took it like a champ (once low air, once bad macro). God Bless that machine!Image
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About the car - My poor E46 blew a head gasket and would overheat coming into work. I said f it, I live at the shop now. It only needs to get me 2min over to the gas station and back for air compressor diesel, just short enough so that it wouldn't overheat
Best part about that car who struggled through so much is that Scott @ScottyD63_ , who got me this PO, owns it now. Fresh motor. Better than ever. Full circle Image
@ScottyD63_ More to that point. We forged a strong friendship during this. He got me a life-changing opportunity which I can never repay, but then became one of my closest friends through this and many other ventures.
Engineer <> Machinist relationships are the best :) Image
On Bill Selway: I never got the opportunity to meet and thank him, he passed in 2021. He changed my life by believing in some young crazy kid.
My story seems unique in the industry, but as it turns out, it was more of the rule than the exception when it comes to people who Bill Selway has helped.
As I talk to more and more people, there is always somebody with another story of Bill absolutely making their career and asking for nothing in return.
Rest in peace Bill Selway, you legend. Your legacy lives on.Image
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All that said, my biggest takeaways are:
- Earn trust. When people stick out their neck for you, REFUSE to let them down.
- Working ridiculously hard is so freaking fun. I don't look back on this period fondly despite the challenges, I look back fondly because of them.

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More from @peteoxenham

Jun 16, 2024
Okay, time for a DFM roast so all you engineers can see how machinists think. @emm0sh volunteered this part, I don't have the time to do a full write up so I'm just gonna live tweet me going through it, exposing the sins, and optimizing it

(1 of ?) Image
Off the bat, we have the cardinal sin of zero radius internal pocket corners. A round tool can't get into a corner. Some of the others are radiused so I'm just assuming it's a mistake and i'm going to note that I'm making this change for later Image
Second, we have this ridiculous radius on the floor that I am certain is completely arbitrary because it's nominal 6mm. I have my stuff set to inch but I've seen the number 0.236in on radii enough to know when engineers are up to these games Image
Read 16 tweets
Jan 21, 2024
Machining Apple's Vision Pro Headset
Apple's manufacturing processes are some of the best in the world, and shrouded in secrecy with the exception of their occasional manufacturing videos. Based on the clips, let's break down the machining shown in the latest video step by step.
Extrusion - The vision pro headset starts as an extrusion which we see in the opening shot. Molten aluminum is pushed through a custom die to create bars (usually 12ft) of the outside profile.

From there, an automated saw cuts each bar to proper length for machining.
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Machining - Op 10 - 3 Axis Mill
The blank is loaded into a fixture with six pneumatic clamps, and four of them are secured at the beginning of the program. The machine here is a 30 taper compact footprint mill similar to Fanuc Robodrill or a Brother Speedio. These things are all about packing a lot of speed into a tight package that you can fill a factory with.Image
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Read 11 tweets

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