• brian Rupnow's Avatar
    Yesterday, 08:10 PM
    It depends on whether you want to be close or want to be accurate. Most of the things I build are for model i.c. engines. The required accuracy is...
    43 replies | 1351 view(s)
  • brian Rupnow's Avatar
    Yesterday, 02:36 PM
    And now, since I have the material setting right here on the corner of my desk, I think I will machine some bronze.
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    Yesterday, 02:06 PM
    So, here's a view "Down the hole" as it were. The crankshaft fits in nicely, nothing rubs or scrapes when rotated through 360 degrees. There is one...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    Yesterday, 10:54 AM
    So--Ladies and Gentlemen--Here we have it!! My very first, two piece pressed together crankshaft. One picture shows the two pieces separated with the...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-31-2014, 07:42 PM
    IT WORKED!!!!! 0.503" was just the ticket. It was all I could do with my big nasty old mechanics vice to bring the shaft all the way thru the web,...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-31-2014, 06:21 PM
    It has been a rather upside down afternoon for me, and in all the excitement I forgot to post a couple of "in process" shots of the crankshaft webs....
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-31-2014, 06:10 PM
    Just as I was all set up to start silver soldering, my wife called about some emergency connected with the new house. Seems that 3 year old grandson...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-31-2014, 02:45 PM
    Hmmmmmmm---The best laid plans of mice and men----I reamed the holes in my web plates with my 0.4985" reamer. I then went to press the 5.0005 drill...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-31-2014, 08:10 AM
    Here you can see my crankshaft web layout on one of the cold rolled steel bars. (There is one extra arc on there that shouldn't be---I had the...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-31-2014, 07:39 AM
    The gears---
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-31-2014, 07:36 AM
    I seem to get more reactions to my posts when I post the actual in progress drawings of the pieces I am making even though these drawings may change...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-31-2014, 07:26 AM
    This type of crankshaft, where only one half bears the load from the connecting rod, and the other half simply follows the arc of the first half to...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-30-2014, 06:06 PM
    Nothing of real importance machined in the last two days. I moved my son and his family from a rented townhouse into the house I bought two weeks...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-29-2014, 07:28 PM
    So far, on this build, I have been making great speed machining the comparatively "easy" parts. I consider the hardest parts will probably be the...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-28-2014, 06:20 PM
    And here we have it with the "poll approved' baseplate. In the rear view you can see the two 3/16" diameter alignment pins which fit into holes...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-28-2014, 05:36 PM
    And yes, I do occasionally resort to "crude lashups"----Especially when my main Kurt clone vice lacks just that tiny little bit of opening wide...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-28-2014, 11:30 AM
    Well, that's my good (machining) deed for this morning. Now on to more mundane things like mowing the lawn. We've had so much rain this summer the...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-28-2014, 09:00 AM
    After initially turning one end of the 2 1/2" diameter aluminum to size, I tried to cut the 6" length down in my little 14" bandsaw, but it kept...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-28-2014, 07:18 AM
    Today I'm going to start out making this part. If all goes well, I may even get to the base plate.
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-27-2014, 06:28 PM
    So---what do you do with sticky gears??---Well, if you live at my house you find a way to "unsticky" them. There are a host of different reasons that...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-27-2014, 11:52 AM
    Things are going together remarkably well, so far. I had a bit of problem with gear mesh between the crank gear and the jockey gear, but I am sure...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-26-2014, 05:06 PM
    Well, if you squint your eyes real hard, and look at it just the right way, it's beginning to look like an engine.At least all the big parts bolt...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-25-2014, 07:15 PM
    I will post a download to all of the drawings for this engine as .pdf files for those who would like to build it. I used to post the drawings as I...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-25-2014, 05:36 PM
    I just about got caught!!! I finished up the two main bores in the crankcase, and just as I was finishing the hole thru the top for the con rod and...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-24-2014, 07:51 PM
    Carl--Quite possibly you are correct. I feel that it needs some adjustment. All the valves on all my other engines needed some adjustment. I know how...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-24-2014, 05:31 PM
    And so it begins---Once I had the outsides of the block milled to size, I set it up in the 4 jaw chuck and drilled a hole all the way through, and...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-24-2014, 07:48 AM
    Thank you gentlemen. I have abandoned this concept for the time being, and have decided to build a bar-stock side valve engine instead. It may be...
    50 replies | 3456 view(s)
  • brian Rupnow's Avatar
    08-23-2014, 09:56 AM
    Okay!!! At 0.095" edge distance, we are golden!!! No break out of the threads thru the side at that edge distance. I will write that on my wall of...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-23-2014, 09:41 AM
    And the short answer is---that doesn't work either!! The thread still breaks thru. This is going to call for a small design change on the affected...
    157 replies | 13177 view(s)
  • brian Rupnow's Avatar
    08-23-2014, 09:25 AM
    One burning question remained--On the cast iron cylinder, due to very close clearances and constraints, I ended up with a #5-40 tapped hole 0.079"...
    157 replies | 13177 view(s)
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About brian Rupnow

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About brian Rupnow
Biography:
I am 64years old, a design engineer by profession, and an amateur machinist.
Location:
Barrie, Ontario, Canada
Interests:
I build hotrods as a hobby, and have been involved in custom cars and drag racing most of my life.
Occupation:
I am a design engineer with 42 years experience designing prototype machinery and factory automation

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