Author Topic: PMR #5 - as a fill in project  (Read 12954 times)

Offline b.lindsey

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Re: PMR #5 - as a fill in project
« Reply #120 on: June 28, 2018, 12:50:02 AM »
Hi Dave, well I'm trying to get the boy to retire so we can think about starting up a model engine show with a southern ambiance ...lol.

Bill
« Last Edit: June 28, 2018, 01:32:29 AM by b.lindsey »

Online Dave Otto

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Re: PMR #5 - as a fill in project
« Reply #121 on: June 28, 2018, 01:12:37 AM »
Sounds great, I would love to come and hang out with you guys.

Dave

Offline Tennessee Whiskey

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Re: PMR #5 - as a fill in project
« Reply #122 on: June 28, 2018, 01:48:50 PM »
Yíall just keep rubbing it in  :lolb:  Maybe someday: heck, even DOG retired. Dave we would love to have you. Uh, on the lítl popper Bill; letís just say Bozo showed up and Iíll get to that this weekend. 

Cletus

Offline b.lindsey

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Re: PMR #5 - as a fill in project
« Reply #123 on: June 28, 2018, 05:34:49 PM »
Well darn Cletus! Maybe if you offer Bozo free meals at the diner, he will stay away.

Bill

Offline b.lindsey

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Re: PMR #5 - as a fill in project
« Reply #124 on: June 28, 2018, 05:40:59 PM »
A few little bits this morning. The piston is made from a piece of brass. Fortunately, I had made a .050" grooving bit for previous PMR engines no doubt so that helped (photo1). Then threaded the two eccentric rods and the piston rod as well as you can see in photo 2. Will see what this afternoon has to offer.

Bill

Offline b.lindsey

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Re: PMR #5 - as a fill in project
« Reply #125 on: June 28, 2018, 07:08:08 PM »
One more quick picture. I made four 3-48 hex nuts and  one 5-40 hex nut, all from 3/16" hex stock. The 5-40 one locks the bottom of the piston rod to the crosshead. One of the 3-48 ones secured the piston to the piston rod and the other three fit on the valve and eccentric rods as shown.

Bill

Online crueby

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Re: PMR #5 - as a fill in project
« Reply #126 on: June 28, 2018, 08:30:06 PM »
 :popcorn: :popcorn: :popcorn:

Online J.L.

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Re: PMR #5 - as a fill in project
« Reply #127 on: June 28, 2018, 10:14:27 PM »
Hi Bill,

 :popcorn: as well...

Watching with interest as my crosshead is mounted to the piston rod in exactly the same way.

Great work.

John



Offline zeeprogrammer

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Re: PMR #5 - as a fill in project
« Reply #128 on: June 28, 2018, 11:38:45 PM »
Yíall just keep rubbing it in  :lolb:

Thanks!  :ThumbsUp:
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline Tennessee Whiskey

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Re: PMR #5 - as a fill in project
« Reply #129 on: June 29, 2018, 12:02:32 AM »
All is looking great Bill. Those are right up there with Ottoís nuts. Will you be polishing your nuts  :Jester: :lolb:  Zee; naw I ainít gonna do that on Billís thread  :Argue:

Cletus

Online Dave Otto

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Re: PMR #5 - as a fill in project
« Reply #130 on: June 29, 2018, 12:36:23 AM »
Nice nuts are very important.  :lolb: Most folks put too steep of a chamfer on them, for models I like 20 degrees cut until it just goes full circle.

Looking good Bill!



Dave

Offline b.lindsey

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Re: PMR #5 - as a fill in project
« Reply #131 on: June 29, 2018, 12:44:29 AM »
Thanks guys, sorry there isn't more to show yet but I'll get there. Cletus, how did you go about cutting that square for the valve mechanism? Two "v" grooves on the mating parts or other? Still head scratching on that one.

Bill

Offline Tennessee Whiskey

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Re: PMR #5 - as a fill in project
« Reply #132 on: June 29, 2018, 12:44:25 PM »
Bill, I had a look back at my build ( Lord that was five years ago). I didnít show that part, but, if my memory serves me well, I did do it with two V cuts. I think I might even have bought a small 45 degree cutter for it.

Cletus

Online Jasonb

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Re: PMR #5 - as a fill in project
« Reply #133 on: June 29, 2018, 01:16:00 PM »
You could just mount them at 45degrees and then use the corner of a regular milling cutter.

Offline bent

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Re: PMR #5 - as a fill in project
« Reply #134 on: June 29, 2018, 04:24:45 PM »
Been scratching my head on that one too, Bill.  Have not yet cut chips on the #5, but have been fettling and painting castings, and slowly accumulating tools (like a long boring bar for the support frame) and thinking it through...

Debated buying/making a square broach for the holes, but that seems overkill.  The v-cutter will likely work simplest.