28 May 2018

Budget Boomers - Electro Voice Sentry

Let's see,
what do we have here...
More big speakers!!

For years now I'd been wanting to build speaker cabinets,
and fill them with good components.
Cause I don't have any other projects to do...
Sadly I've collected good components a few times,
Altec 416/515 woofers and horns,
but with no carpentry tools and the big pdx move,
let them slip away.
A chance craigslist perusal uncovered these gems.
At $100 a piece,
they solved the cabinet building issue,
while supplying decent mid-grade components,
supposedly from Electro Voice Sentry speakers.
Of course there were reasons for the budget price,
found after they were unloaded at home.
Each woofer had a little rip.
Darn!
The packing tape repairs had fooled me.
The tears didn't cause any rattling or buzzing,
so a hack repair was in order.
Tissue paper and wood glue to the rescue!
Basically paper mache acting like a fiberglass repair,
They dried up stiff as the rest of the cone.
The gaping holes 
allowed me to check out the guts.
Electro Voice t-35 tweeters,
1823m midrange driver, 8hd horn,
and some big magnet 15" 8g? woofers,
all hooked up with custom crossovers.
The tuned port cabinets were well made with plywood.
Not show quality,
but perfect for the garage.
Definitely a score for the dough.
But the sound...
For shop speakers they were just ok.
Some tunes were mixed evenly,
others were grating.
The blaring mid-range was like a shotgun.
I resorted to putting cotton balls in the holes,
which softened the sound.
The builder had started to tune them
Each speaker had 2 knobs,
L-pads that control the two horn outputs,
but they weren't wired.
A quick solder hook up allowed easy experimentation,
uncovering the faults of the system.
Come to find out the EV 8HD horns
have design flaws from the get go,
throwing sound out like a cannon.
Maybe a pair of Altec 811b horns (top) could help.
I couldn't resist copycatting color cues from
old JBL 4345 monitors.
Ugly enough to be cool.
The first one went back together easy,
and the music was finally tamed.
The wild horn diffused the sound waves.
Definitely worth the effort.
The second one needed a new L-pad,
which took a week to arrive.
One was broken,
and both were glued in.
Which meant they disintegrated upon removal.
JB weld is some strong stuff...
Maybe a hammer and channel locks didn't help!
I really didn't want to wait another week.
Since the first speaker worked so well
without needing to move the tweeter knob,
the L-pad ohms were checked at the position used,
about midway,
about 5 ohms.
Luckily I had a stash of 4.7 ohm resistors.
Justifying why hoarders don't throw anything away!
A single measured at 5.8 ohms,
which maxed out the 20% variation
these were spec'd at.
Two in parallel measured at 3.7 ohms.
I'm sure there's a formula for this...
Two were wired up to the tweeter + wire.
One could be cut out if the sound was too bright.
Finally the set was complete!
Time for a late night cranking session..
More soon!
TP 

30 April 2018

Toro 580D - pushing the limits

After a brief hiatus,
looks like I can finally write again!

The mowing season is starting.
Night temps are in the 40's,
so grass is growing,
however the ground is a bit wet.

Mowing is like mud bogging and off-roading.
This Toro 580D is a 4wd unit,
with monster front tires,
one of the few capable machines for this.

This bank runs alongside the entrance.
It's got a good slope,
which the mower travels on sideways.
I tried to cut to the top,
but the 5000 lb mower didn't like it.
The grass was tall enough to bog the engine,
then with both wings down,
the left tire started digging in.
Holey Chit!!
Not good to be stuck up there!

Lifting the left wing gave some traction,
but turned the body slightly up the hill.
Not a good feeling!
On a bank you're not sposta go in reverse,
but there weren't too many options.
Backing up straightened the machine out,
but the 4wd only plowed forward a little bit,
until the tires lost their grip,
and the back end started sliding down the hill!
Holey Double Chit!!

It was like slow motion.
Somehow I balanced the wings,
and maneuvered down the slope.
It was crazy but fun.
No soiling of the pants!

I checked the machine,
then continued on like nothing happened...
The dirt scar will be there for a while!
So far I've been stuck 3x this year,
bringing my grand total to 12,
which means a couple dozen close calls.
Now I should know not get too close to downhill fences,
and I should know when there's a mud bog.
The problem is trying to get that last tuft of tall grass.
It's like the bait of a quicksand trap.
Fortunately getting winched out is part of the job!
This one was technically in December,
in a spot on the border of our responsibility line.

I was going round and round,
closer to this sharp incline,
and got too cocky.
Whabamp!!
I thought "speed" or momentum would get me through,
but all it did was jack the front wheels above the dirt.

Good times!!

TP

21 March 2018

Whoops

Heres a recent whoops...
A perfect candidate 
for the good ole bait and switch technique.
Can you spot what happened in this picture?
At lunch break I parked the silver bullet truck
in the way of our much larger flatbed.
Holey chit!!
Well what else was I gonna do the next day?
The guys keep me busy that's for sure.
Shops got some fun tools,
although they need work to work.
The portapower was dry of oil.
Very handy if rarely used tool.
The tailight surround had limited access,
a little heat and hammering was enough
to at least zip tie the light back in.
The bait and switch was repainting
the bright blue banding reel.
Unsurprisingly the dent is barely noticed!
TP

24 February 2018

Bomba

Holey Chit!!
It's been almost 3 months!!!
Had a few hiccups this year,
writing had some difficulty flowing.
However pics and projects haven't stopped.
Let's start with a semi-recent work project...
This was a super-leaky and almost seized 
berkeley water pump.
A dozen years ago they simply replaced it,
but the not-too-local shop wanted almost $2800!!
I'm sure a rebuild woulda been cheaper,
if it wasn't for the "lets hit it with a hammer to loosen it" situation.
The broken packing gland/housing is cast iron.
I tried stick welding with the special rod,
but access was limited.

The easiest solution was brazing.
Not the prettiest but it's dang strong.
The previous dissassembly was a pita.
I ended up cutting the shaft in pieces,
welded a bolt to the impeller section,
and used an impact gun to twist it out.
I couldn't resist some rattlecan wonder.
At the time it was in the 30's,
so the stockroom was heated up as a spray booth.
The assembly was a piece of cake.
The new shaft is stainless steel,
so it should last forever compared to the original.
The rebuild kit was about $600,
after time and materials,
this saved over half the rebuild estimate.
And I was able to fix a broken impact gun
while the paint dried.
The guys at work will never get new equipment!
The worst was yet to come.
Before installation,
a 5-gallon bucket of rust was scooped out of the tank.
I was trying to get out of this type of work,
by going to a cushy city job.
Oh well!
The plate shield had deteriorated to dust.
I hammered out a bolt-in screen,
hopefully this keeps the pump healthy.
The tank already had some rust through holes,
the thickness probably half in most places.
An experiment with a couple boat zincs
may stall any electrolysis from the mineral rich well water.
All wrapped up!
Let's see how long it lasts...
More soon!
TP

18 December 2017

A day in the life... Leaf Battle


In this late fall season there is a battle,
a consistent yet finite barrage of falling leaves.
The ground crew is hindered 
by the suffocated grass they try to protect,
as the ground is too soft for faster but heavier equipment.
Ruts are bad.
Here the tools of choice are backpack blowers,
rakes,
and possibly these gas powered side blowers.
Funny thing is all three were broken.
Bad head gasket on #1,
bad exhaust manifold/muffler on #2,
and a coil on #3.
The coil was easy,
I just swapped one from the bad head gasket donor.
The guys were all over it,
justifying the fix of the other two.
The replacement exhaust manifold had a screw on outlet,
but nothing to screw in.
I raided the scrap pile for tubes and pipe fittings,
and welded up a custom muffler.
All that practice with hot rods, boats,
motorized bikes and scooters...
The new silencer worked perfectly,
quieter than most of our engine tools here.
The first day went well,
other than the mini front roller digging into the soft grass.
No problem.
Some quick brackets and a fat roller wheel...
Zip zip with a welder and voila!
Now get out of here and start blowing leaves...
There are acres of leaves...
To pick them up.
there's a Toro Rake-O-Vac,
basically a trailer vacuum/rake,
that hadn't worked in a couple years.
New battery,
an overpriced coil,
and this was good to go.
It works great on unpiled leaves.
Well...
One of the guys pulled a full load to the compost area,
hit a whoop-de-doo in the road,
that opened up the trap door,
spilling a compacted pile that took 2 hours to clean.
Now nobody wants to use it!
Then they dug up this thing,
a stadium vacuum,
previously attached to a broken buggy.
It worked great til the hose broke for the umpteenth time.
The fallback is the good old pitchfork.
Manual labor at its finest.
Scoop by scoop...
the leaves slowly disappear.
Until one of the trucks takes a chit.
A busted starter allowed the fix of a lingering oil leak,
probably the rear main seal.
This meant tearing out the transmission,
fun on a 4x4 with a transfer case.
Years ago work had traded a local junkyard a broken vehicle,
for this ford ranger which had a bad transmission,
along with a replacement.
The previous mechanics got it running,
but cranked every bolt so tight they were barely able to unthread.
The exhaust wouldn't come off without breaking a bolt.
To make room I cut and hammered the welded seam lip,
visible on the top there.
While I did technical stuff 
like cut out a hard to find gasket...
The outside guys laid around.
It wasn't much fun putting this together,
but there was success getting it running.
Time for something fun.
I found a scrap bumper in a metal pile.
It was set aside for this truck,
but nobody could cut and weld here.
Some crude bracketry...
Cut cut Zip zip...
Now we could push gates open,
and move trash cans around.
Didn't take long to get it back to work.
Seriously there are tons of leaves here.
They'll get composted into the mulch pile,
and eventually returned back to the earth.
I still need to get the 3rd blower working,
too late for this season.
At least everything is green again!
TP