Chris's Worthington Brewery Pump

[tghs]

looks like it came out great

[bent]

That's very cool.  Looked up the machine, and it's cheap for what you get...hmm.  A colleague at our sister company wanted a machine for circuit board milling, may have to point him at this one.

[cnr6400]

  Nice bar of solid gold ready for transition to air bell / pulsation damper! Are shop elf ball turning specialists Sphere, Rick and Al standing by? 

(sorry, worst pun this week and it's only Monday.)     

[Kim]

That cover looks great! 

Are shop elf ball turning specialists Sphere, Rick and Al standing by? 

(sorry, worst pun this week and it's only Monday.)     

Nowhere to go but up from here, right?   

Kim

[crueby]

That's very cool.  Looked up the machine, and it's cheap for what you get...hmm.  A colleague at our sister company wanted a machine for circuit board milling, may have to point him at this one.

Yup - circuit board milling is one of the things they aimed that machine at, they have the milling bits for it too. The machine is built on a heavy aluminum frame, most of it is hidden in the case but they have pics on their site without the shell on it. Their support is pretty good too - had a couple questions when I first set it up, and they replied to emails in a couple hours (during business hours, of course).

[crueby]

Nice bar of solid gold ready for transition to air bell / pulsation damper! Are shop elf ball turning specialists Sphere, Rick and Al standing by? 

(sorry, worst pun this week and it's only Monday.)     

Yup, they are here! Hope these ones didn't work on the Liberty Bell, not all lits cracked up to be!   

[crueby]

That cover looks great! 

Are shop elf ball turning specialists Sphere, Rick and Al standing by? 

(sorry, worst pun this week and it's only Monday.)     

Nowhere to go but up from here, right?   

Kim

Nah, we can do worse! (see my reply about the Liberty Bell) 

[crueby]

After lunch got the blanks for the next parts cut on the bandsaw, and started turning on the lathe. Ahhhh... Nice to be back turning the cranks myself!   

Started with the pipe flange/spacer that goes between the top cover and the force chamber - as shown in this drawing, on the right hand end with the pipe sticking out to the left:

Got the shell turned to size and bored out, it still needs to have the hole for the pipe drilled in the side and the bolt holes drilled. Going to wait on the bolt holes till the lower end of the force chamber is done so I can drill all three parts together in one setup.


So, on to the force chamber! 
Going to make it in two parts, the lower 3/4's of it, and the top hemisphere. I want to hollow it out like the original is, so I'll bore from the upper end down through the part. I've got the blank trued up on the ends, left long enough to grip in the chuck now and part off later. I've turned the outside down to the diameter at the top end, and bored the center out to the diameter at the lower/narrow end.

Next will be to bore out the inside to the curved shape to follow what the outside will be. Before starting that I need to spend a little time in Fusion to generate a stepover chart of handwheel moves to bore the shape inside and out - don't want to freehand wing it and wind up breaking through the shell when turning the inside.

Might be a day or two before that boring is done - have a trip to the dentist in the morning to extract a tooth, all depends how the recovery from that goes. Any volunteers to go in my place?      (cricket noises are all I hear, that and footsteps running away!) 

[PaulR]

I hear nothing but I see tumbleweed blowing across an otherwise empty landscape.

I had one out last year, courtesy of a young woman from the far east who looked as if she barely had the strength to stand up but to be fair she didn't muck about, the tooth was out in a flash and pretty much pain free (thanks to 3 or 4 local jabs).

Anyway, really looking forward to seeing this pumping away even if you are no longer a crack crank addict.

[crueby]

Got the step chart made up, and it was too cold and rainy out to do anything outside so more playtime in the shop. Got the inside cut on the lower force chamber. Started with the initial bore through the part, and did one set of cuts to each length on the chart for each 0.025" increase in diameter. That gave me this bell mouthed but slightly stepped shape:

Another view to show the steps better

Then did one pass from the outside in to trim off the worst of the steps, moving very slow. The .025 steps made it easy, 1/2 turn per step, and I watched carefully as I advnaced the cutter to ensure I was getting to the half turn before the next step started. Since this is on the inside and will never be seen after assembly, the finish is good enough. On the outside, I'll finish off with files.

Next time I'll do similar passes on the outside. For that I'll cut in the other end, and use a right hand tool moving from the chuck end to the outer end to make the steps. I'll put a disc on the end of the live center to support the outer end and keep it from wobbling, since the cut will be pulling away from the chuck. Thats a good place to break for the day though!
 

[steamer]

A picture of a few "Lizards" in use.

[crueby]

A picture of a few "Lizards" in use.

I know exactly where that is!!   

[cnr6400]

 

[crueby]

This morning I got the outside of the lower force chamber turned, again using a step chart generated from the CAD model to rough it in, then files and sandpaper to finish off the curve. An old arbor piece was used to let the live center support the outer end:

It was then parted off to length, forming a nice goblet for the shop elves. Don't tell them about the hole through the bottom... 

A view from higher up, showing the inside profile better:

So, now I can go to the rotary table on the mill and drill the mounting holes in the chamber, pipe flange, and the center of the cover plate. After that can get started on the top dome for the force chamber, which will get pinned and loctited in place.

[PaulR]

That's a piece of art!