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Old 12-02-2012, 06:39 PM   #191
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I'm working on the rod clevis on sheet 7. I don't see a dimention for over all length. Does this mean it's not critical?

Chuck


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Old 12-02-2012, 07:04 PM   #192
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I'm working on the rod clevis on sheet 7. I don't see a dimention for over all length. Does this mean it's not critical?

Chuck
Yes ... I came up with an overall dimension of .707" by scaling up.


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Old 12-02-2012, 07:13 PM   #193
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I'm working on the rod clevis on sheet 7. There is no overall length dimention given as I can see. Or am I missing something? Is this dimention critical?
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Old 12-02-2012, 07:21 PM   #194
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I don't see where you came up with that dimention, Pat. Could I trouble you to explain?

Chuck
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Old 12-03-2012, 12:30 AM   #195
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I don't see where you came up with that dimention, Pat. Could I trouble you to explain?

Chuck
Sure ...

There several ways to come up with the overall dimension ... all of which will be approximate.

The missing dimension is the distance from the left edge of the .282" and the left edge of the part. Find that and we know the overall length.

One way ... eye ball, the .282 is almost the same distance as the missing, but a little smaller ..guess at say .3" now the overall is .707" could be .7 or so etc.

Another way ... measure the actual distance of the .282" using calipers and eye loop. Measure the missing actual distance then using ratios calculate the missing distance. I used this method then rounded to .3". You may very well come up a different number but close.

Now with that distance you can look at the other parts of the Crankshaft to see how it fits. Using the .707" I came with a few threads showing when I put all the pieces together using SolidWorks.

We will need to adjust the location of the Rod Clevis when tuning the Engine.

Hope is helps ...
Pat H
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Old 12-03-2012, 12:59 AM   #196
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Thanks for the explanation, Pat.
I guess I'm making this a lot harder than it needs to be. Plus, even though I worked as a draftsman 40+ years ago, and the last 17 as a computer tech, I never got into CAD/CAM or 2d/3d rendering. Experience has taught me not to trust scale in a photocopied or printed drawing.I am probably trying for much tighter tolerances than necessary.
Anyho, I have most of the materials cut except the brass for the bearing.
How would you guys tackle the bearing? Cut 2 pieces and solder together (will soft solder work for that?), drill/bore the bearing hole, and separate? Or drill/bore solid piece and split with slitting saw.

Chuck
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Old 12-03-2012, 05:12 PM   #197
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Chuck,

I have on my list of parts 2 sets of bearings to make so I'll tell you how I plan on making them.

I'm going to flaten the mating surfaces of the top and bottom of the bearing (ie cap and base) - this will be the datum from which the other measurements are taken. Then I'm going to clamp them together and drill, then ream the bearing hole. Before removing from the clamp I'll mark them as a matched set (ie 1T and 1B, 2T and 2B, etc), then I'll proceed to work on the profile, and other features.

I guess I could do the profile and other features 1st, either way the "split" is done 1st, then the hole is made with the 2 parts held together. You shouldn't need any solder to hold the parts while making the hole, and the solder won't clean up properly after - leaving you a job of reworking the surfacces and then also re working the hole....

Mike

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Old 12-03-2012, 07:42 PM   #198
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Thanks, Mike. You guys make this seam so easy.

Chuck
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Old 12-07-2012, 08:57 PM   #199
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Next question...
So far, the rod clevis's are done, and the rods proper are cut to length and threaded. I'm working on the plate at the end of the connecting rod. It is easier for me to make it as a separate part and either silver solder it myself or have a team member do that for me. I've made the first one, tapped it 2-56 and it just press fits on the end of the rod proper. My question is, is this press fit o.k for silver soldering? Or do I need to open up the fit a bit? (I have only silver soldered 1 part in my life)
BTW, I found a local distributor for Silver Solder, and a hose for my Dad's 60 year old Prestolite torch, so I'm going to have a go at soldering it myself. Still have to go get the solder, flux, and hose. I have my Dad's torch kit, and his acetylene bottle. Hope there is some gas left in it!
And, another first for me, I made and used my first filing button for rounding the ends of the clevis arms. They came out pretty good, if I do say so myself.
Time for happy our with SWIMBO, I'll take some pictures tomorrow of the parts I've got done so far.
Thanks for allowing me to take part in this build. I have learned so much, and accomplished much more than I thought possible already.

Chuck
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Old 12-07-2012, 11:38 PM   #200
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Hi all Chuck it sound like you are having a good time at this ,that is what this whole team build is all about. Glad that you decided to come along. What size did your rods turn out to be . Pat what are we going to use ,a packing or an o-ring ,and what persent squeeze will their be on the o-ring. Also on the cyl. the exhust hole it shows a 1/8 hole .375 deep also a 5-40 thread . The hole for a 5-40 thread is a number 38 drill .which is .101. Please advise as to what we will use. Thanks Dale


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