Xterra done

The new todo list is as follows:

  • Install new dishwasher Done
  • new Guibo bush on the 128
  • new center bearing support on the 128
  • implement new home-theater amp to eliminate double stereo
  • Trip to IKEA
  • Deport virtulized XP machine from my world. First test tomorrow
  • Implement UnRAID and Plex all the things.

Heil + Horns

Heil has arrived

Crossover Build

Pair Backloaded Horns + Single AMT-1
AMT-1 Re=3.4Ohm
FE126 Re=7.2
Parallel FE126 = 3.6Ohm

ESS claims to use a 800hz, 3rd order crossover. Let’s investigate what capcitor and inductors we can actually get, and calculate where the x-over point ends up using parts I can find.

Lets pick out some components….

  • L1 = Jantzen .5mH 18AWG $7.98
  • L2 = Jantzen 1.1mH 18AWG $11.48
  • L3 = Jantzen 0.37mH 18AWG $7.29
  • C1 = 40uF 250v $11.98
  • C2 = 2x60uF 250V $20.48
  • C3 = 75uF 250V $22.98

Let’s proceed to set this up though, let’s model these values in software and see where the x-over point is…

Looks like it hits 806hz at these components, good enough for me.

Update:11-19-19 The Heil has arrived. After some deliberation, constructing a dedicated passive crossover for this setup is inflexible, and given the consideration that I am unlikely to stick with ‘The Horns’ for much longer, I am better served moving to a solution that I can re-use in the next speaker I use. Active digital crossover inbound, and another amplifier.

Semi-productive weekend?

Good news, the Xterra runs great. Bad news, I continue to never ever get a water pump to seal on the 1st try. Every time, I follow other people’s advice, and use ‘recommended’ sealants, applied in a neat (thin) way. It always leaks. This always results in purchase of a new gasket, followed by gooping the living shit out of it. Bet it works this time. New timing belt is re-installed, hasn’t been tensioned, need to roll the crank a couple times and put my 22lb on it.

Mist Cooling Bandsaw

Due to a large fabrication project underway I have a lot of box steel to chop up on my vintage Rockwell Model 7V. Blades are not cheap, and I have them made for me. To this end, preservation of the blades is a priority. Designed a magnetic base with captive rare earth magnets, a combination of 6mm and 20mm rare earth units fit, is compact, and secures the mist solution very well. I use sta-lube water soluble oil diluted at roughly 10:1

Friday needs a quote

“The strategy for the discoverers and entrepreneurs is to rely less on top-down planning and focus on maximum tinkering and recognizing opportunities when they present themselves. So I disagree with the followers of Marx and those of Adam Smith: the reason free markets work is because they allow people to be lucky, thanks to aggressive trial and error, not by giving rewards or “incentives” for skill. The strategy is, then, to tinker as much as possible and try to collect as many Black Swan opportunities as you can.”
― Nassim Nicholas Taleb, The Black Swan: The Impact of the Highly Improbable

HP DesignJet 500 Restoration

We have had laying around the office a rather old (2003) 24″ HP DesignJet 500 with a shredded belt. I took it home and brought it back to life. I did not use the ‘real’ belt that is available from LPS (though it looks perfectly correct) I just used this cheap Amazon belt. If it goes wrong later on, and if I actually use this thing here at home, I’ll replace it with the LPS one.

After an unsuccessful attempt at rehabilitating the printheads that have been in the machine for years. These printheads work perfect.