Schindler Engineering

Teardown is in todays playlist:
https://youtube.com/playlist?list=PLGuJySJ3giZdGwtand_MqM3xNXCjnAnmk&si=JHVHi63jWgCcmZ3D

Picture of the damage… 9 parts, 2 detonated

That is definitely a different part number that we replaced on the MPPT board of SN002.

Datasheet:
https://www.st.com/resource/en/datasheet/stgwa80h65dfb.pdf

PN: STGWA80H65DFB
(poor PN as the B read as an 8 and the ST was not marked on the chip)

No Stock at Mouser (on order)
You CAN NOT order the -4 part
https://www.mouser.com/c/?q=STGW80H65DFB

Google says you can only get them from FleaBay and Sketchi-bah-bah but check out what Octopart says!
https://octopart.com/search?q=STGWA80H65DFB&currency=USD&specs=0

Oh bugger – that is an AG (automotive Grade)
At first they seem ALMOST symmetrical but they are not. Read all the specifications and see that we could probably replace all of them with these, but mixing them may result in some miss-match turnon. Bugger.
AG Datasheet: https://www.st.com/resource/en/datasheet/stgwa80h65dfbag.pdf

They are NOT THE SAME! It is not just a part that went thru additional screening and qualification, they ARE different parts. Read all the specs.

grrrr….

Manufacturer has them (Why does Octopart not search this?!?)
https://estore.st.com/en/stgwa80h65dfb-cpn.html

DOH DOH DOH
* First they give me a coupon code that does not work
* Then they make me go all the way thru checkout before telling me they are out of stock
* Idiots

Ok… Ebay it is… but they are 2 for one there, S K E T C H … B R O – and its like a month of shipping, not going to happen

GAHHHHH!

Lets buy 9 of the Automotive Grade and replace them A L L – going to be a lot more work – GRRRRR

Ok, I had to order all 9 to replace them as a pack to play it safe. The others were probably punched H A R D anyway – and – what is messed up is that we still dont have root cause!!!!!

ACK – ok, $100
They are on the way Second Day UPS (best value)

-Schindler

I started by buying a vintage compound bow that was built the year I was born (1977!). I paid around a hundred bucks for it and it came with:

• Fiberoptic Sights
• Quiver
• Shock Absorber
• Wrist Strap

A few months back we bought about 42 destroyed arrows from the Dead-Store (Used Thrift Store) and glued fletching’s where they were missing. Now we are on to tying a D-Loop to facilitate a trigger actuated Release

Ok – so this is a highly specific rope that is intended to be used for this purpose. I picked a mile of it up off Amazon for 8 bucks along with a $14 release and some knife-proof arm guards.

Fascinating Rope
It is not stiff until you work it in. Speaking of “worked in”… check out my paws! Ack!

I am NOT saying this is the correct way to do it. I am showing that this is how I did mine. The knot will self tighten severely and we will depend on a melted blob to stop it from coming unwound on us.

The only thing I know is that the rope is supposed to exit on OPPOSITE sides as shown above. Apparently this offsets the twisting effect. Anyhow, the loop above is too long, but it works. It was the very first I ever tried to tie.

I left significant “fuzz” to melt so that I felt there was a better knob at the slip point. More advanced shooters hardly have anything…. Pure-Lucky is what holds it together! KEEP IT POINTED DOWN RANGE!

I used a butane torch to set the slack on fire, then let it burn down to the interface, blew it out, and smooshed it. That should hold. The soot on the loop was poor form.

Just looking at it from different angles

At this point I could have pulled in some of the loop to get it closer to 1/2″ or 3/4″. This was my first attempt so I did not fool around trying to get it perfect. I just needed to see if it would work at all!

I also procured some Bees Wax… Kind of wishing I had applied that for the additional friction. I probably will when I re-do this.

The rope burns very predictably and it is not super-sticky like some cheap ropes are. You can pat it down with your finger right away and not end up screaming.

There we have it! Read to tighten and Test!

You can pull the absolute crap out of it with the wife’s pliars

I miss Pictures and Prose. Youtube has sucked the life right out of me.

Yep – Good to go. Lets ship it and see what happens.

Finest Quality Arrows you can get for $5 at the Gray Bears Used Discount Store!

Recently I got thorped BAD by my sons short-bow. That thing is absolutely nothing compared to this, so I am going to wear some guards. These are intended to protect you from dog bites, knife cuts, etc. I am setting up with 2 layers to try and lower the pain level.

Whatever a “CUT LEVEL 5” is, you get these for a couple bucks a piece off Amazon. El’Cheap-o

Ah ha

You are obviously not supposed to clip your forearm with a 50lb Compound Bow! The ticket is to roll your elbow out. Unfortunately I learned with a long bow and a fast draw, so if I get caught up in it… my arm is in the firing line. It will take a lot of time to learn to cock my arm out and not hold it straight.

-Schindler

If you landed here looking for Patrick Schindler, MSEE Stanford – well, you landed in the right spot. I don’t really use this website much any more… but the contact information is up to date.

• Email
• LinkedIn
• Phone Number

I primarily take work by word of mouth. Every once in a while I take a risk and join an unknown team for a wild adventure.

With the economy what it is, I am currently open to work in any industry, though I strongly prefer work in:

• Solar, EV, EVSE, Batteries, High Voltage, ebikes, Power Electronics, or anything like that

Within that realm I am comfortable with :

• R&D Engineering
• R&D Test Engineering
• Quality Engineering
• Manufacturing Test Engineering

I am a hands-on Test Engineer first, so that is how I engineer anything. In the words of Fetchter:

• “One Test is worth a Thousand Opinions”

I design by breaking the problem up into as many small and testable parts as is practical. I then build only on solid groundwork. I believe Validation is something that is done during the engineering process, not afterward. I believe Test is the core of the engineering process, not an afterthought or regulatory requirement.

Test == Engineering

-Schindler

We had our first official company outing yesterday.

In celebration of Kimberly passing her second CPA exam…  and in anticipation of a lot of hard work coming…  we decided to repel down a cliff to a very hard to access “moonscape” beach.

Here is a map of the location

 

Here is a Photo Sequence

Looking forward to the next trip and hope you will join us.  Here are a few videos

Tidal movement 1 of 3

Tidal movement 2 of 3

Tidal movement 3 of 3

-Patrick