• brian Rupnow's Avatar
    Yesterday, 06:31 AM
    Toolguy--I think of you every time I run the engine, and how kind it was of you to make those two arms for me. Michigan Doug--I agree---Determination...
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-21-2014, 04:58 PM
    Just a final post to end off this thread in case someone finds it in the future, The engine ran well, but the crankshaft was not straight, and...
    543 replies | 44497 view(s)
  • brian Rupnow's Avatar
    04-21-2014, 04:51 PM
    And here we have it. The perfect end to a story. The engine runs well, the crankshaft no longer wobbles. I can end this post on a positive note, and...
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-21-2014, 09:39 AM
    Here we are, back where we started. Measurements show that I still have .008" total runout on the flywheel, so nothing changed at that end. However...
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-20-2014, 04:01 PM
    I have made them both ways. Both ways have pros and cons. One piece crankshafts are a beautiful thing---when they come out okay.
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-20-2014, 02:59 PM
    Flutedchamber---I do have a 4 jaw chuck for my lathe. Tell me---Have you ever made a crankshaft for a twin cylinder engine the way you are suggesting?
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-20-2014, 02:55 PM
    So--We now have ball bearings front and rear. When I bore these blind holes to support a bearing, I don't try for a press fit. Just a "good sliding...
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-20-2014, 10:46 AM
    There has been a slight change in the game plan. I thought that while I have everything apart anyways, this would be a good time to put ball bearings...
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-20-2014, 08:12 AM
    brian Rupnow replied to a thread Toolpost grinder in General
    I've decided not to buy one. If I can't grind a taper with it by setting the grinder on an angle its use would be too limited. For emergency...
    51 replies | 3772 view(s)
  • brian Rupnow's Avatar
    04-19-2014, 02:37 PM
    I'm pleased!! when I released the tailstock chuck and slid it back out of the way, the very end of the new shaft had about .008 total runout as I...
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-19-2014, 02:05 PM
    Well, so far so good. One picture shows the new shaft in the chuck. Damned thing turned out a bit blurry, but I started with 1/2" cold rolled steel,...
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-19-2014, 12:17 PM
    BlackAdder--You are absolutely right. I hadn't thought of that. My measuring equipment is not really set up for measuring runout on the inside of a...
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-19-2014, 10:44 AM
    I wasn't real happy with the results from reaming the crankshaft. When I put the dial indicator on it, the hole was about .008" total runout. So--I...
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-19-2014, 10:18 AM
    I started the hole with a centering drill in the tailstock chuck, then drilled through with a 1/4" drill, then an 11/32" drill, then figured out that...
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-19-2014, 09:44 AM
    So---Set up in the lathe, I measure .030" of total Wonk. That's .015" out of true center. The next trick will be to cut that bad end off and bore out...
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-19-2014, 09:29 AM
    Dang--What a miserable little piggy to get the crankshaft out of. No worse than any other engine I suppose, but an hours work to get everything...
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-19-2014, 08:39 AM
    brian Rupnow replied to a thread Toolpost grinder in General
    Plumber--don't preach to me about lazy attitude!! I may be a lot of things, but lazy is not one of them. I know I could probably design and build a...
    51 replies | 3772 view(s)
  • brian Rupnow's Avatar
    04-18-2014, 09:49 AM
    brian Rupnow replied to a thread Toolpost grinder in General
    I guess maybe the second part of my question should be, does anybody sell a toolpost grinder that mounts to (wait for it----The TOOL POST!!!) That...
    51 replies | 3772 view(s)
  • brian Rupnow's Avatar
    04-18-2014, 08:51 AM
    brian Rupnow started a thread Toolpost grinder in General
    I am considering buying a toolpost grinder from Little Machine shop. The site doesn't give a lot of information about them, and I have never used one...
    51 replies | 3772 view(s)
  • brian Rupnow's Avatar
    04-17-2014, 07:11 PM
    Jpfalt--That is a remarkably good idea.--If I had a toolpost grinder, I would do that.
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-17-2014, 07:08 PM
    Before I begin to tear everything apart, I decided it would probably be a good idea to measure just how much "Wonkiness" my crankshaft actually had....
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-17-2014, 06:09 PM
    I'm quite excited that so far this spring (touch wood), I haven't needed to use my new generator!!!--Brian
    32 replies | 1403 view(s)
  • brian Rupnow's Avatar
    04-16-2014, 06:38 PM
    Thanks Mark. I'm very proud of the way that engine turned out, but you know how it is---No matter how well the engine works, the first thing everyone...
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-16-2014, 05:45 PM
    Enough time has gone by now, that I can start thinking about the wonky crankshaft on my opposed piston engine. Through trial and error I have weeded...
    34 replies | 1911 view(s)
  • brian Rupnow's Avatar
    04-16-2014, 12:22 PM
    Blackforest--My granddaughters would love the sheep!!! Toolguy--The arbor has to be open at one end to hand load the rollers onto. I will design an...
    10 replies | 1087 view(s)
  • brian Rupnow's Avatar
    04-15-2014, 04:42 PM
    Okay--The game has changed. I just heard from my customer. That strange looking wheel is off a different custom machine which they buy from the U.K.,...
    10 replies | 1087 view(s)
  • brian Rupnow's Avatar
    04-15-2014, 08:29 AM
    brian Rupnow replied to a thread place for gears in General
    There is a bit of CAD magic available at that site. Use the "build your own gear" option and it will then let you download a very accurate 2D .dwg or...
    4 replies | 402 view(s)
  • brian Rupnow's Avatar
    04-15-2014, 08:11 AM
    Chipmaker--That was my "alternate" idea. However, there is a bit more going on than is apparent in the picture. Not only does the strange wheel with...
    10 replies | 1087 view(s)
  • brian Rupnow's Avatar
    04-15-2014, 08:02 AM
    Very nice!! I built one like that when I was about 14, using an old iron horse washing machine engine. It worked, but the engine made the bicycle so...
    10 replies | 901 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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