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Home Model Engine Machinist > Showing Them > A Work In Progress > Cirrus V8 rotary valve engine build 2x scale up

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Old 09-21-2017, 10:54 PM   #71
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Hi Dave the first photos the start of hogging out the crankcase
the second photos show the finish hogging with the half holes and centre bearing recess machined for when i realized i had to get the tool all the way in
Dims are not important as the case has clearance for the moving parts
Regards barry


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Old 09-21-2017, 11:00 PM   #72
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I got the sump finished and then fitted to the crankcase with the required fixings then rough out the CC,bolt together and bore the end holes and machine
the centre bearing section This then allows you to finish machining the crankcase


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Old 09-23-2017, 11:22 AM   #73
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Thanks, Barry. Now to make some aluminum chips!

Dave
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Old 09-23-2017, 10:47 PM   #74
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Yes a foundrys worth
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Old 09-28-2017, 09:59 PM   #75
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Barry,

During the machining of your crankshaft, I noticed that the ends weren't turned to the final diameter. Just what was the chronology (in decreasing diameters) did you use during the machining of the crank. On the plans, if you double everything, the final end looks like it should be 0.376 in. Did you go that small? What was the final OD and ID of the ball bearing you used on the ends? It looks like you didn't go to final diameter until the end. I'm assuming you did this to keep some beef at the ends for stability during the machining of the eccentrics and the middle bearing surface. I almost botched the end of my slug for my crank. I also forgot some machining teachings of a Master Machiist. I got piggy in trying to hog out too much material in the block. Now I'm waiting for some new 3/8 inch boring bars after breaking off a brazed end. And everything I do wrong never goes into the trash. I save all my learning experiences (botched work) in a drawer. And from time to time when I'm looking for something, when I find that stuff, I take the time to look at them and remind myself, "Don't do that again!!"
Dave
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Old 09-28-2017, 11:20 PM   #76
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Hi David,i did not double up everything exactly.The cheap skate bearings
are 21x12x5. The shaft ends i finished at 10mm rather than .375. where possible i went slightly larger than size in some areas.The crankcase was was \bored out to 16mm dia The centre brass bearing can be anything but i kept it
to 16mm for strength.Everything was kept oversize while the main turning was done and final turning to size kept light.I will repost all my photos here with
additional text.Hope it all makes sense.My memory has fadedClick image for larger version

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Old 09-28-2017, 11:24 PM   #77
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And the restClick image for larger version

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Old 09-29-2017, 01:35 PM   #78
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Thanks Barry,
In the future, you don't have to show pictures to me. I have all the pictures you've posted on a flash drive. So anytime I need to see what you've done, I can always refer to my flash drive. Now with your reply, a lot of things are making sense to me now. Not only you, but I have a best friend who's a retired master machinist who's guiding this "grasshopper" on what to do. Let's see if I have the smarts to actually LISTEN and not go off on my own!!!

Dave
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Old 09-29-2017, 11:31 PM   #79
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Keep going grasshopper.Dont forget it was daunting for me and i learned
as i went.Everything worked out well for well for me so dont deviate too much
Keep us posted.Allthough Chuck Fellows did the design and supplied all the drawings,the changes i made made it the biggest and most complex job to date for me.But looking back doing it in stages made it easier
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Old 09-30-2017, 10:35 AM   #80
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Hi Barry,

Just a quite note to say thanks for the build thread, and taking the time to update the photos after photo bucket did the dirty on everyone; greatly appreciated!

Cheers,
.adrian


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