Recent Posts

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1
CNC / Re: PCB routing
« Last post by awemawson on Today at 02:37:17 AM »
It makes you wonder how they make them?
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Project Logs / Re: Close. But, no Cigar.......
« Last post by SwarfnStuff on Today at 02:35:28 AM »
Getting betterer and betterer David. You will get that cigar yet,  :clap:  but, by then you might have given them up.
        Your rescue efforts are always a good read.
Thanks for posting.
John B
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CNC / Re: PCB routing
« Last post by PK on April 23, 2017, 09:40:07 PM »
Say hello to my little friend!
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Model Engineering / Re: Rockerblock engine--something a little different--
« Last post by Brian Rupnow on April 23, 2017, 08:51:05 PM »
After a nice break and a drive with good wife, I had to come down and check on the state of my crankshaft, which has been basking in its own private bathtub. The water didn't have as much effect on the cardboard "washer" as I had hoped for. The next trick was to put one end of the crankshaft in my shop vice with aluminum soft jaws and carefully apply some heat to the center of the con-rod, while applying fairly gentle pressure on the con-rod. Once the heat migrated down the con-rod and softened up the Loctite which was preventing it from moving, it began to move freely, and I immediately squirted everything with lubricating oil to keep the heat from affecting the crankshaft itself.  The rod now moves freely. I set the crankshaft up in my lathe and put an indicator on it to see if the runout had changed after I cut the center out between the web plates. I discovered that this crankshaft is quite a "flexible flyer". Initially it had about .015" total indicated runout. I grabbed the free end and gave it a tug in the direction it had to move and after doing that a couple of times I had it down to .004" total indicated runout.  I had read before about how flexible these single throw crankshafts are, and as I understand it some snowmobile crankshafts with integrated connecting rod are adjusted for runout in the same manner. At any rate, I'm happy, and I think the crankshaft will work fine. I'm not going to pin the pressed connections. Both the rod journal and the crankshaft itself are small enough that I don't want to weaken it by drilling for pins.----Brian
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Model Engineering / Re: Rockerblock engine--something a little different--
« Last post by Brian Rupnow on April 23, 2017, 08:50:33 PM »
Well there!! I've had as much fun as I can stand for one day. Those sideplates aren't quite finished yet, but they are awfully close. I'm tuckered out.
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Model Engineering / Re: Rockerblock engine--something a little different--
« Last post by Brian Rupnow on April 23, 2017, 08:49:49 PM »
And just for the fun of it---here is the crankshaft, luxuriating in it's custom made water filled bath-tub. (which may have been a juice bottle at one time.) I trimmed away all of the unwanted parts this morning. Right now the con-rod appears to be Loctited to everything else, but I'm hoping that with a four hour soak, the .016" cardboard washer on one side of the con-rod will dissolve, and I can break the con-rod free of everything else. I may have to apply a little heat to the center of the con-rod and let it work its way down until the con-rod lets go and decides to turn for me.
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Model Engineering / Re: Rockerblock engine--something a little different--
« Last post by Brian Rupnow on April 23, 2017, 08:49:09 PM »
My little pile of parts is growing. Today I will finish off the crankshaft, and build the engine sideplates. I made the rocker yesterday afternoon, and for a simple enough part, there are a world of set-ups in it. I used my new con-rod fixture to relieve the material around the bosses on each side of the rocker, and it worked great for that too.
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Our Shop / Re: 'Living with an old Synchro' and other tales from my shed.
« Last post by DavidA on April 23, 2017, 04:55:34 PM »
When I first reported that my stuff had been stolen I wrote...

..No doubt I will find that some other bits and pieces have also gone. But I won't know which until I need them and can't find them...

and today I went out to get my 1/4" drive socket set. But it wasn't there.  And I decided to carry on with the battery charging experiments I had been reporting here.
But there were no batteries in the shed. All ten of the old batteries had gone. Now I know why they stole the wheel barrow.


But there is a glimmer of light at the end of this dark tunnel.

Tonight a relation who has friends in dark places gave me the name of the thief.

It seems that a 'friend of a friend' has heard this villain bragging about his exploits. And the word has now got back to me.

So tomorrow I will go down to the local police station and pass on this info. Clearly I will not say from whom it came, but it may lead to better things.

Things may be looking up.

Dave.


9
Project Logs / Re: Another homemade milling machine
« Last post by shipto on April 23, 2017, 04:28:47 PM »
So I have now turned my attention to the knee slides and in yet another operation that would have been done better with a mill I made 4 elongated slots in each and made some blocks to help me get them lined up straight and keep them there. I have decided that I will get one side lined up as best as I can to the column and pin it, then everything will be lined up to that.
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Project Logs / Re: Close. But, no Cigar.......
« Last post by Stilldrillin on April 23, 2017, 12:42:07 PM »
After some deliberation. I made a couple more mods.

New cam. This time, 180*. Which seems more logical, to me.......




Modded the wick tube, slightly. To give a wider flame, at the port area......




The test, (not quite), run......

<a href="http://www.youtube.com/watch?v=U9OV1JcVd-o" target="_blank">http://www.youtube.com/watch?v=U9OV1JcVd-o</a>


That's the second time, it has perked up, on camera!
 Though..... Mrs. Drillin was doing the filming. (We all try harder, when She's around).......  :thumbup:

Seems. The only mod left, is to ditch the 1/4" dia saucer, and fit a shim valve. Like Poppin(?).....




Beginning to feel a little desperate, now....

Thanks for looking in!

David.
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