Author Topic: Greene Automatic Cutoff Steam Engine  (Read 10964 times)

Offline kvom

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Re: Greene Automatic Cutoff Steam Engine
« Reply #195 on: December 03, 2019, 12:49:50 AM »
The piece that was cut away from the yoke supplies the clamping pieces.  First, I located and drilled the mounting holes for 2-56 screws.



Then parted from the main body.



Repeat on the other end, and we're ready for the next stage.



After this I cleaned up the sides of the arc to reduce their thickness, but I didn't take any pics here.

Next op will be to mill a rectangular through pocket in the central arm where a type of ball-joint will be placed.  The eccentric strap is a bit too wide and long to fit inside the yoke, so some fettling will be needed before they can live happily together.

Offline Craig DeShong

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Re: Greene Automatic Cutoff Steam Engine
« Reply #196 on: December 03, 2019, 01:37:19 AM »
Is he posting any of his work?

No.  Unfortunately he shys away from computers which is a shame because his work is exemplary 
Craig

Offline kvom

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Re: Greene Automatic Cutoff Steam Engine
« Reply #197 on: December 03, 2019, 12:29:26 PM »
Just as well, as I'd suffer from the comparison.   :-[

Offline kvom

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Re: Greene Automatic Cutoff Steam Engine
« Reply #198 on: December 04, 2019, 02:50:24 AM »
The inside of the yoke needs to be flat for enough depth that the inner eccentric can rotate.



Continuing on with fitting the smaller half of the eccentric strap to the yoke.  The width was fine, but I had to take a good bit off the outer edge with the belt sander to arrive at this.



Then it was time to drill the pivot holes using the same technique as for the eccentric strap.  Drilling had to be done separately from each side, but my .126" reamer was just long enough to do both holes together.



Moment of truth when we see how well it goes together using some 1/8" drill rod as pivots.



Looking at the video of another build, it down't appear the the pivot ange is very great, much less that these parts can do.

Offline scc

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Re: Greene Automatic Cutoff Steam Engine
« Reply #199 on: December 04, 2019, 10:33:32 PM »
Excellent work and detailed posting,    I'm watching and learning.        :popcorn:     Terry

Offline kvom

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Re: Greene Automatic Cutoff Steam Engine
« Reply #200 on: December 06, 2019, 09:23:42 PM »
The next op is to mill a through rectangular hole in the arm of the yoke.  To minimize filing needed to square the corners, I was hoping a 1/8" endmill would work.  When mounted on the mill, two problems became apparent.



The first was that for the end of the hole, there was still too much of the cast arc in the way.  The second problem was that the spindle would hit the arc before the bottom of the hole was reached.  Solution to the first problem was to mill away the part that was blocking the hole.



Then I found a 3/16" endmill in my supply that is 3" long.  A 1.6" stickout ensured that the spindle would be above the arc when the bottom of the hole was reached.


Offline crueby

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Re: Greene Automatic Cutoff Steam Engine
« Reply #201 on: December 06, 2019, 09:57:38 PM »
Great progress, watching along...   :popcorn:

Online sco

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Re: Greene Automatic Cutoff Steam Engine
« Reply #202 on: December 07, 2019, 09:51:01 AM »
That strap is full of challenges isn't it - you keep overcoming them though!

Keep it up,

Simon.
Ars longa, vita brevis.

Offline kvom

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Re: Greene Automatic Cutoff Steam Engine
« Reply #203 on: December 07, 2019, 11:58:12 AM »
The end is in sight on this one anyway.