Author Topic: PMR #5 - as a fill in project  (Read 13339 times)

Offline J.L.

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Re: PMR #5 - as a fill in project
« Reply #150 on: July 14, 2018, 07:15:26 PM »
Hi Bill,
Nice seqquence of operations and photos here.
John

Offline bent

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Re: PMR #5 - as a fill in project
« Reply #151 on: July 16, 2018, 07:10:40 PM »
Looking good, Bill!

Offline b.lindsey

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Re: PMR #5 - as a fill in project
« Reply #152 on: July 16, 2018, 10:13:15 PM »
Thanks John and Bent. I have odeed a 90 degree cutter to cut the "v" grooves n the underside of he valve guide straps, and later in the frame itself. Should have that tomorrow and he same fixture will be used to center the grooves. More on that tomorrow.

Bill

Offline crueby

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Re: PMR #5 - as a fill in project
« Reply #153 on: July 16, 2018, 10:16:22 PM »
Aren't you able to tilt your mill headstock 45 degrees? That would let you use a normal end mill.


 :popcorn:

Offline b.lindsey

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Re: PMR #5 - as a fill in project
« Reply #154 on: July 16, 2018, 10:22:55 PM »
Yes Chris I could, but am trying to get perfect matching of the v grooves between the straps and frame and I think this way will be easier for that. Good excuse to get a chamfer mill too.

Bill

Offline zeeprogrammer

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Re: PMR #5 - as a fill in project
« Reply #155 on: July 16, 2018, 11:14:11 PM »
Good excuse to get a chamfer mill too.

There ya go.  ;D
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
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Zee-Another Thread Trasher.

Offline crueby

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Re: PMR #5 - as a fill in project
« Reply #156 on: July 17, 2018, 12:09:46 AM »
Good excuse to get a chamfer mill too.

There ya go.  ;D
More tools?   :thinking:


Heck yeah!   :D

Offline b.lindsey

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Re: PMR #5 - as a fill in project
« Reply #157 on: July 17, 2018, 12:14:26 AM »
My thinking exactly  :lolb:

Bill

Offline b.lindsey

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Re: PMR #5 - as a fill in project
« Reply #158 on: July 18, 2018, 09:35:08 PM »
Today the crankshaft got finished. I had turned the two shaft ends previously between centers ( photo 1). In order to turn the crank I had to make a little jig with the proper offset (photo 2) and with that done turning the crank pin wasn't too bad (photo 3). The final part is shown in photo 4.

Bill

Offline zeeprogrammer

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Re: PMR #5 - as a fill in project
« Reply #159 on: July 18, 2018, 09:43:02 PM »
That's pretty cool. I don't think I've ever seen a jig like that.  :ThumbsUp:
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 #5 - as a fill in project
« Reply #160 on: July 18, 2018, 10:24:31 PM »
Zee, unlike Chuck's procedure using hot rolled steel, this was a CI casting with no "ears" protruding from the crank pin section. My 4jaw chuck is too small to offset the .437" required so this was the only option I could come up with. I'm sure I seen others do something similar. The slot in the jig allows for positive drive and you can see I used a short piece of rod with the center to keep it pressed into that slot. May not be the best way but it worked.

Bill

Offline crueby

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Re: PMR #5 - as a fill in project
« Reply #161 on: July 18, 2018, 10:31:56 PM »
One of the kits I did many years ago (either a Stuart or a PMR) had this method in the instructions, I still have the big bar I used, makes a good weight. It was just able to fit in the chuck on the Sherline, was a scary operation as I recall, with that heavy a bar out in midair.
 :popcorn: :popcorn: :popcorn:

Offline Dave Otto

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Re: PMR #5 - as a fill in project
« Reply #162 on: July 19, 2018, 01:24:03 AM »
Hey Bill
The crank looks great!


Dave

Offline Tennessee Whiskey

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Re: PMR #5 - as a fill in project
« Reply #163 on: July 19, 2018, 11:21:20 AM »
Nice job Bill. I used a jig like that for the Red Wing. They do add an extra bit of rigidity. I just watched a David Richards video and he was working on a full size square valve rod setup like this engine uses. I really like his videos

Cletus

Offline steamer

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Re: PMR #5 - as a fill in project
« Reply #164 on: July 19, 2018, 11:59:39 AM »
I like it Bill!    Storing that one away in the file!..

Dave
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Damned ijjit!