Author Topic: PMR 7 Twin Cylinder Steam Engine  (Read 32046 times)

Offline zeeprogrammer

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Re: PMR 7 Twin Cylinder Steam Engine
« Reply #150 on: April 25, 2018, 11:23:28 PM »
American Indians intentionally place a,fault in their jewelry so that the piece is never perfect.  Sounds like a good explication to me.  I've used it myself.   :pinkelephant:

 :ThumbsUp: I like that. Now I can explain to T why I'm not perfect.  :Lol:

Finished the head covers.
1st pic shows a machinist clamp holding the head cover to the base so I could use a transfer punch and mark the holes.
I didn't need the machinist clamp. Finger pressure was enough to prevent movement.

2nd pic shows getting ready to spot drill the 3rd hole in one of the head covers.
I used foam to keep the parallels from moving.

3rd pic shows the head covers in place with the screws. Just checking.

Now the question/problem is going to be transfering the holes to the cylinders and keeping the cylinders square to each other.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
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Offline b.lindsey

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Re: PMR 7 Twin Cylinder Steam Engine
« Reply #151 on: April 26, 2018, 01:11:01 AM »
As Cletus said, you ARE on a roll Zee. Nice work, but you realize you are setting a precedent now...no more newbie excuses  ;D

Bill

Offline zeeprogrammer

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Re: PMR 7 Twin Cylinder Steam Engine
« Reply #152 on: April 26, 2018, 01:36:17 AM »
As Cletus said, you ARE on a roll Zee. Nice work, but you realize you are setting a precedent now...no more newbie excuses  ;D

Thanks Bill.

How about 'newbie 2nd grade'? I may have made that.  ;D
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
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Offline Jo

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Re: PMR 7 Twin Cylinder Steam Engine
« Reply #153 on: April 26, 2018, 07:36:01 AM »
Good progress Zee,  :)

 :thinking: Hey Zee have you thought of finding a box to put all your made bits in? That heap looks like bait for the wrong sort of Workshop gnome  :paranoia: ... they will be just waiting for you to knock it so that they can practise their cricket fielding and scurry off with the bits you have made  :facepalm:

Jo

P.S. Zeeprogrammer  :stickpoke: should it not now be Zee_retired_programmer  ;)
Enjoyment is more important than achievement.

Offline zeeprogrammer

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Re: PMR 7 Twin Cylinder Steam Engine
« Reply #154 on: April 26, 2018, 11:35:06 AM »
Thanks Jo.

:thinking: Hey Zee have you thought of finding a box to put all your made bits in? That heap looks like bait for the wrong sort of Workshop gnome  :paranoia: ... they will be just waiting for you to knock it so that they can practise their cricket fielding and scurry off with the bits you have made  :facepalm:

Not to worry. I have a very effective anti-Chris's elves/gnomes system in place. (From what I can tell, they are the only 'wrong sort of Workshop gnome'.)  ;D

P.S. Zeeprogrammer  :stickpoke: should it not now be Zee_retired_programmer  ;)

Nice idea but not quite retired from programming. Note the 'system' I just mentioned.  ;D
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline Craig DeShong

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Re: PMR 7 Twin Cylinder Steam Engine
« Reply #155 on: April 26, 2018, 02:12:19 PM »
Look'in good 'newbie 2nd grade'  :popcorn:
Craig
The destination motivates us toward excellence, the journey entertains us, and along the way we meet so many interesting people.

Offline crueby

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Re: PMR 7 Twin Cylinder Steam Engine
« Reply #156 on: April 26, 2018, 02:39:12 PM »

Not to worry. I have a very effective anti-Chris's elves/gnomes system in place.

Then who is that elf behind you?    :LittleDevil:

Offline zeeprogrammer

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Re: PMR 7 Twin Cylinder Steam Engine
« Reply #157 on: April 26, 2018, 05:38:24 PM »
Not to worry. I have a very effective anti-Chris's elves/gnomes system in place.
Then who is that elf behind you?    :LittleDevil:

That's no elf, that's my wife.  ;D

Got the valves done.

1st pic shows one being turned down to diameter. Used a live center since the part was sticking out about 1 1/4".
2nd pic shows a test fitting.
3rd pic shows the slots being turned to diameter. It's a posed shot. The live center was used. Probably not generally a good idea to remove and then replace the live center but the slot diameters are not critical.
4th pic shows drilling for the steam hole and the clevis pin.
5th pic shows the valves done.

The red marked one is to remind me it's for the right cylinder. But I don't think it matters.

The left one enters the famed 'wall of learning'. Somehow I converted 7/16 to 1/8 when I walked from the drawing to the machine.  :facepalm2:

This is one time where the provided raw material was much more than needed. I'm thinking they knew I'd have a go and would need more.  ;D
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
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Offline zeeprogrammer

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Re: PMR 7 Twin Cylinder Steam Engine
« Reply #158 on: April 26, 2018, 05:57:14 PM »
A family shot.

Several of the parts need some finishing.

In the upper right corner is the material for the remaining parts:

Pistons, eccentrics, eccentric hubs, crossheads, and piping.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
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Offline Gas_mantle

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Re: PMR 7 Twin Cylinder Steam Engine
« Reply #159 on: April 26, 2018, 06:04:06 PM »
Nice work Carl  :ThumbsUp:

We ought to have a runner before too long  :)

Offline crueby

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Re: PMR 7 Twin Cylinder Steam Engine
« Reply #160 on: April 26, 2018, 06:04:14 PM »
Looking good - going to be puffing away soon!

 :popcorn:

Offline b.lindsey

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Re: PMR 7 Twin Cylinder Steam Engine
« Reply #161 on: April 26, 2018, 06:53:36 PM »
Very nice work Zee. Can't wait to see it running!!

Bill

Offline bent

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Re: PMR 7 Twin Cylinder Steam Engine
« Reply #162 on: April 26, 2018, 08:19:00 PM »
Yup, those look pretty good.  I recall making two valves for my one-cylinder PMR #3, so you are doing good to make 3 for 2 in my book. ;)

Offline zeeprogrammer

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Re: PMR 7 Twin Cylinder Steam Engine
« Reply #163 on: April 27, 2018, 03:04:55 PM »
Thanks very much!

Finished the pistons today.

1st pic shows a 1/4" end mill be used to mill the recess for the nut. Plans called for 5/16 but I didn't have that. Nut is smaller than 1/4" so no problem.
Backup plan was to grind a drill down and use it.

2nd pic shows a parting tool being used to make the slots for the rings.

3rd pic shows the completed pistons with one assembled.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
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Offline Gas_mantle

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Re: PMR 7 Twin Cylinder Steam Engine
« Reply #164 on: April 27, 2018, 03:14:05 PM »
Carl, I don't now what you intend to use for piston rings but I find rolled up graphite yarn soaked in oil works great

http://www.maidstone-engineering.com/fittings/misc-fittings/graphite-yarn-1-16-twist-approx-4ft

 

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