Author Topic: The Dickson!  (Read 10974 times)

Offline maury

  • Full Member
  • ****
  • Posts: 409
    • Lone Star Engine Works
Re: The Dickson!
« Reply #90 on: November 24, 2018, 10:49:19 PM »
Thomas, thanks for the compliment.

I'm back from the Thanksgiving trip, so I thought I'd post a bit more progress.

I've finished the upper mains, or bearing caps. The photos show some of the steps along the way.

Next step is to order a long 39/64 drill to bore the mains. I have a .626 reamer. Next post will show the setup and steps.

maury
"The trouble with socialism is that you eventually run out of other people's money."... Margaret Thatcher

Offline crueby

  • Full Member
  • *****
  • Posts: 7148
  • Rochester NY
Re: The Dickson!
« Reply #91 on: November 24, 2018, 11:48:56 PM »
Very nice progress! Looking forward to seeing how you do the boring, going through that many bearings always makes me pause and think. A lot.
 :popcorn: :popcorn: :popcorn:

Offline maury

  • Full Member
  • ****
  • Posts: 409
    • Lone Star Engine Works
Re: The Dickson!
« Reply #92 on: December 01, 2018, 08:59:25 PM »
Cruby, thanks for the compliment.

Boring the mains is not as much a challeng for me as it is for my equipment.
I have a Bridgeport, and still had to improvise. The 39/64 drill came in yesterday, I already had
the .626 reamer, so I got started.

1) The first pic shows the main setup jig I used. I have a square tower block that I used to hold the
engine base. I needed it to be above the table a bit, so I raised it a bit. The tower isn't exactly
square so I had to shim the base a bit to get everything square with the table. This took a bit of fiddeling,
but it wasn't bad.

2) After that I found the zero on the bearing, and set up ther DRO in case my  work was interrupted.

3) Center Drilling where the hole will be bored.

4) Since my Bridgeport can't accomodate a 12" drill on top of the base I have, I used my 39/64 Jobber drill
to start the hole. I was able to drill the top 2 bearings and start a nice centering hole for the long drill.

5) With the table all the way down, I removed the top 2 bearing caps and was able to get the long drill
into the chuck.I was able to complete drilling all the bearings.

6) Reaming, the reamer was shorter, and fit into the space if I used a collet to hold it. All the bearings
were reamed.

7) Finish on reamed bearings.

8) There was a generous amount of burring on the soft leaded bronze. I cleaned up the parts, and assembled
the crank to the base and added the caps. The moment of truth! Did I bore the holes straight, and did I
get the crank straight? It turns out the fir is silky smooth through the rotation, and just a little bit
snug to turn. I probably could have used a .627 reamer, but I didn't have one. I've found that when reaming
soft leaded bronze, the fit may be a little tight. It'll wear in nicely.

maury
"The trouble with socialism is that you eventually run out of other people's money."... Margaret Thatcher

Offline 10KPete

  • Full Member
  • ****
  • Posts: 1402
  • Nordland, WA, USA
Re: The Dickson!
« Reply #93 on: December 01, 2018, 11:12:29 PM »
That's just beautiful!!

Pete
Craftsman, Tinkerer, Curious Person.
Retired, finally!
SB 10K lathe, Benchmaster mill. And stuff.

Offline b.lindsey

  • Global Moderator
  • Full Member
  • *****
  • Posts: 12365
  • Dallas, NC, USA
    • Workbench-Miniatures
Re: The Dickson!
« Reply #94 on: December 02, 2018, 01:13:19 AM »
Awesome Maury!!  Had missed a few posts but caught back up again now.

Bill

Offline PJPickard

  • Full Member
  • ****
  • Posts: 118
Re: The Dickson!
« Reply #95 on: December 02, 2018, 03:14:20 AM »
OK now that I found this thread I will be following closely!
Nice work!

Offline Dennis

  • Full Member
  • ****
  • Posts: 29
Re: The Dickson!
« Reply #96 on: December 02, 2018, 03:44:13 PM »
Really good work Maury, thanks for posting your progress on the crank.  I have been looking forward to seeing that assembly.  You are getting way ahead of me!  I like the way you made the bearings and crank shaft, and the assembly looks perfect.  I am working the drawings and photos you sent me into the drawing package so all the options will be there. 

My crankshaft material is cut and squared with the machining centers in the ends.  I decided to make the machined crankshaft because I have never done that before.  I'll never learn any younger.

I will be looking forward to seeing your base with the columns and cylinders installed.  The low pressure cylinder pattern has been at the foundry for 7 weeks now so we should have parts soon.  I know they are very busy and our pattern is not the highest priority.

Paul, glad you found the Dickson thread.  Welcome, I hope you enjoy following it.  Maybe we will see a new thread on your compound engine one of these days?
Dennis


Offline J.L.

  • Full Member
  • ****
  • Posts: 1608
Re: The Dickson!
« Reply #97 on: December 02, 2018, 03:54:38 PM »
Incredible work!
John

Offline maury

  • Full Member
  • ****
  • Posts: 409
    • Lone Star Engine Works
Re: The Dickson!
« Reply #98 on: December 07, 2018, 11:10:58 PM »
Hay guys, Thanks so much for the compliments, I appreciate them a lot.
]So, I have some progress to report in the con rods. I have completed one, and will finish the con rod assembly on my next post.
here is the progress on the  cross slide and the  throw bearing parts.

1, 2, 3 ) The cross slide part was made on the CNC, but there was material left over to be trimmed off to match up with the cross slide bearings on the columns after they are machined. This will happen in a later post. The original drawings show the part to be more than 1 piece, but since there are no cross slide shoes on this engine, I made it in 1 piece to simplify the construction.

4) The castings are fettled, drilled and tapped, then cut with a 1/16 saw in the Bridgeport.
5) Then, they are mounted in the lathe, center drilled, and drilled for boring.
6) Boring to about .01 under size.
7) Reaming to final size: .626

maury


"The trouble with socialism is that you eventually run out of other people's money."... Margaret Thatcher