Ed Blackwood's Heatsinks Phase Linear 700B

[mlucitt]

Lee, I would have thought that the heatsinks were drilled the same, just with the fins bent the other direction, no? It seems that engineers always find a way to keep the number of parts down and the reuse up, so it would have been expensive to have two sets of jigs, patterns, part numbers, etc. Maybe it has something to do with the wiring patterns on the back wall, I'll have to take a look at that.

 

[laatsch55]

Mark, I think you are onto something. That looks like just what I need to do.

 

[laatsch55]

Nope, that won't do it. That won't change the orientation of the outputs or drivers. In one row the outputs are on an uphill slant with respect to the leads. IN the next they are down. Bending the fins one way or another does not change that up/down orientation.

 

[laatsch55]

Progress.............

 

[laatsch55]

Went downtown today to get a little benchtop drill press for those times I don't want to go to the shop. A cheapie Ryobi, but I'm not drilling 1" thick 316 stainless either.

 

[P.L.F.]

Progress.............

WOW!!!!!!! I've always considered myself as PL freak. But that is just nothing in compare to your passion, Lee. Mucho respeto…! And it’s contagious, I’m afraid… Keep us all posted on the further progress! Great job.

 

[laatsch55]

Thank you Przem, I shall do that!!

 

[laatsch55]

Going to the Rozet shop here in a bit where our shear and breaks are to make the final bend in two of the heatsinks. Kinda trepidatious about this. don't have much experience on a break(like NONE) , but hopefully we can figure it out without ruining the blanks.

 

[NavLinear]

Going to the Rozet shop here in a bit where our shear and breaks are to make the final bend in two of the heatsinks. Kinda trepidatious about this. don't have much experience on a break(like NONE) , but hopefully we can figure it out without ruining the blanks.

Don't forget to remove the transistors first!!!!!!!!

 

[laatsch55]

Um.....OK.....we'll do that Dennis!!

 

[laatsch55]

Time to go bending...........wish me whatever.....

 

[laatsch55]

They are not perfect, but they will wok. The problem was making the second bend I had to take out 8" of holdown on the break and put in a 1-1/2" square bar on the inside and c;lamp on the bar after it exited the heatsink. The clamping force and angle could not be duplicated and a little "wave" was introduced. So I came back to the Gillette shop and clamped em down in the 150 ton press and took a porta-power and tried to push the wave flat. Almost got all of it out. The seating surfaces are flat at least.

 

[laatsch55]

The Lucas mill and some pics of the Rozet shop.....

 

[laatsch55]

More./......

 

[laatsch55]

It has taken 3 hours of hand filing to get the mating surface flat enough to suit me. Still have another hour or so till they are done. Then the various grades of sandpaper to smooth em up. It may look anal but it really is critical that the surface next to the TO-3 bases is as flat as practical. The file is a brand new Nicholson mill bastard.

 

[NavLinear]

It has taken 3 hours of hand filing to get the mating surface flat enough to suit me. Still have another hour or so till they are done. Then the various grades of sandpaper to smooth em up. It may look anal but it really is critical that the surface next to the TO-3 bases is as flat as practical. The file is a brand new Nicholson mill bastard.

I'd be suprised if you didn't use the bastard file.

 

[Gepetto]

You missed a spot Lee. Just kidding. They look great.

 

[laatsch55]

Thanks guys. Still have a ways to go yet.

 

[mlucitt]

Are you accepting orders?

 

[laatsch55]

When I get the bending down to where I can get a consistent and repeatable look........maybe......