Author Topic: Chris's Holly Pumping Engine Build  (Read 51470 times)

Offline crueby

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Re: Chris's Holly Pumping Engine Build
« Reply #1230 on: September 23, 2021, 10:47:49 PM »
finished up the flattening step on the upper crosshead pieces

makes a good start on the 'kits'



Offline Don1966

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Re: Chris's Holly Pumping Engine Build
« Reply #1231 on: September 23, 2021, 10:58:38 PM »
Oh yeah! I seen some more silver soldering here waiting to see the final results.    :Love:




 :cheers:
Don

Offline crueby

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Re: Chris's Holly Pumping Engine Build
« Reply #1232 on: September 24, 2021, 12:57:07 AM »
Oh yeah! I seen some more silver soldering here waiting to see the final results.    :Love:




 :cheers:
Don
You see clearly Don!  These first pieces will have matching recesses cut into the center bar, and the end bars (the brass ones) will be cut to fit around the center bars, and all four parts will be silver soldered together. Then I'll have the equivalent of the casting the real one was probably made with.
 :cheers: :cheers: (one from me, one from the elves! )
Chris

Offline crueby

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Re: Chris's Holly Pumping Engine Build
« Reply #1233 on: September 24, 2021, 03:59:59 PM »
Some time on the lathe this morning, got the blanks for the horizontal parts of the crosshead turned to diameter and length, with a step in each end. Also cut off the upper pieces from the bars they were held with and trimmed them to length:


Next step is to cut the recess in the side of the cross pieces to take the bottom of the upper pieces. I'll do this on the lathe, with them held in the 4-jaw. Here is how it will be held, and the way the pieces will fit together once the recess is turned in:

Going to take a little time with the indicator to get the bar centered up, good project for this afternoon...

Offline crueby

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Re: Chris's Holly Pumping Engine Build
« Reply #1234 on: September 24, 2021, 05:41:26 PM »
After lunch got the recesses turned in, and also drilled/tapped a center hole. The hole will serve two purposes - a way to hold the upper piece in place for soldering and provide a reference point later on when milling out the center of the cross bar.

Here are the parts so far

Next step will be to cut the semicircles in the brass bars to fit over the ends of the cross bars

Offline Kim

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Re: Chris's Holly Pumping Engine Build
« Reply #1235 on: September 24, 2021, 07:07:22 PM »
Great progress on the crossheads, Chris!  Those are complex little buggers for sure!   :popcorn: :popcorn:
Kim

Offline crueby

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Re: Chris's Holly Pumping Engine Build
« Reply #1236 on: September 24, 2021, 07:37:05 PM »
Great progress on the crossheads, Chris!  Those are complex little buggers for sure!   :popcorn: :popcorn:
Kim
Thanks Kim.

If they dont work for the crossheads, I can make a really complicated door hinge!

Offline crueby

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Re: Chris's Holly Pumping Engine Build
« Reply #1237 on: September 24, 2021, 08:58:51 PM »
After some casting about (bar stock pun there) with the vises, different chucks, etc trying to figure out how to hold the brass bars to bore the off-center and out-the-side holes, I hit on using the faceplate. The hole needed is slightly smaller than the hole in the faceplate, and I found a plate that had two holes in the right place already, just needed one more drilled/tapped to hold it like this for boring:

Worked perfect

One down, 5 more to bore out. The starter hole was done with a center drill, then worked in the boring bar a layer at a time.

Offline cnr6400

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Re: Chris's Holly Pumping Engine Build
« Reply #1238 on: September 25, 2021, 12:30:36 AM »
 :ThumbsUp: :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :popcorn:

Offline RReid

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Re: Chris's Holly Pumping Engine Build
« Reply #1239 on: September 25, 2021, 12:55:19 AM »
That is a really cool looking part. Maybe you should make an extra just to put on the shelf. I'm sure you could make up all kinds of stories to tell people when they ask what it is. ;)
Regards,
Ron

Offline Don1966

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Re: Chris's Holly Pumping Engine Build
« Reply #1240 on: September 25, 2021, 01:14:15 AM »
Yep your the man Dog……. :Love:



  :cheers:
Don

Offline crueby

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Re: Chris's Holly Pumping Engine Build
« Reply #1241 on: September 25, 2021, 01:16:27 AM »
That is a really cool looking part. Maybe you should make an extra just to put on the shelf. I'm sure you could make up all kinds of stories to tell people when they ask what it is. ;)
Lets see...


It's the key to my Tardis


New drive shaft for a Ferrari


Chandelier for the shop elves


It fell off the rocket from the last Apollo launch


Its the wind up key for my robot


...

Offline crueby

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Re: Chris's Holly Pumping Engine Build
« Reply #1242 on: September 25, 2021, 01:17:25 AM »
Yep your the man Dog……. :Love:



  :cheers:
Don


Thanks Don,  what time will you be here for the silver soldering?

Online fumopuc

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Re: Chris's Holly Pumping Engine Build
« Reply #1243 on: September 25, 2021, 10:30:11 AM »
Hi Chris, a lot of progress every week. Nice to see it all coming together step by step.
Kind Regards
Achim

Offline crueby

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Re: Chris's Holly Pumping Engine Build
« Reply #1244 on: September 25, 2021, 02:07:18 PM »
Hi Chris, a lot of progress every week. Nice to see it all coming together step by step.
Great to have you along for the journey Achim!