• brian Rupnow's Avatar
    Yesterday, 07:00 PM
    I don't post very many set up shots anymore, but this is a worthy one. No, it's not a Maltese cross, it's the hub that will hold the four comma...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    Yesterday, 10:12 AM
    Thank you Brian H--I have been using SolidWorks for almost 20 years and didn't know that. Of course I don't do molds so would have no reason...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-22-2018, 07:05 PM
    I was originally going to make this clutch with three comma shaped arms. However, looking at the slitting saws I have, I decided to make it with four...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-22-2018, 01:17 PM
    First part made---the expander hub. I made it from a scrap end of material that I had left over from something.
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-22-2018, 11:07 AM
    In about two minutes I am going to jump up and grab a piece of mild steel and make this expander cone. It's cold outside and good wife and visiting...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-21-2018, 08:06 PM
    Cuttings--glad I made you laugh. Laughter is good for the soul. As far as the angle being too steep--maybe it is. Click on the link in the very first...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-21-2018, 03:57 PM
    I decided that shrinking the clutch to 1/3 of it's original size was just going to make components too small, so I just spent a couple of hours...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-21-2018, 03:38 PM
    Good thinking Larry, but for a different reason. By putting a center hole in the other end, I can use filing buttons on the other end as well to make...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-21-2018, 01:57 PM
    It's okay---I'm going a bit mad these days. I don't have any real design work, I'm waiting for all my authors to publish something new so I'll have a...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-21-2018, 11:21 AM
    Since these parts see the most wear as the clutch engages and disengages, I would make them out of 01 material, flame harden and quench, then draw...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-21-2018, 10:58 AM
    Might be simpler if I welded all three plates together first on the non critical side.--Then machine that area of plate and the weld off as my last...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-21-2018, 10:43 AM
    Do the inside hole first. If you machine the outer diameter first, the walls will collapse when you try and hold it to drill the hole.
    37 replies | 1295 view(s)
  • brian Rupnow's Avatar
    09-21-2018, 10:41 AM
    Non of my slitting saws are large enough to cut these apart if they were all machined on a single piece of stock.
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-21-2018, 10:36 AM
    Final filing would look like this. The filing buttons would let me hold very good accuracy on the round ends. The rest would have to be "filed to...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-21-2018, 10:19 AM
    In second stage of machining all of the grey area would be milled away--again with a good deal of accuracy using the mill DRO's.
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-21-2018, 10:09 AM
    I suppose that if I were to get serious about making this part, the first step would be to rough it out as rectangular part and drill the required...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-20-2018, 05:18 PM
    One of the nifty things about my software is that I can shrink or grow a part by whatever factor I want to. Since my model to develop the drawings...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-20-2018, 10:57 AM
    I think this is an ingenious design for a clutch. The only issue with it that I see is that while it may be great for 1" diameter shafts and larger,...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-20-2018, 09:04 AM
    Velocette--If the part I have labelled "sprocket" and showed a bushing between it and the shaft is in reality the engine flywheel, then there will be...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-19-2018, 08:30 PM
    Okay--Burned a few brain cells on this one. The clutch which I posted a link to in post #1 is not an "over center" clutch. It does however, not only...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-19-2018, 04:58 PM
    Velocette--That over center mechanism is really slick. I have a model log splitter that uses an over center design on the lever which advances the...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-19-2018, 04:51 PM
    I've been studying on this thing, and I think I have it figured out. I'll have to make a model to confirm what I think. It seems that the secret to...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-19-2018, 03:44 PM
    After building the dog clutch for the drag saw, I asked for any friction clutch plans that people could find. Mike, from another forum sent me this...
    37 replies | 1542 view(s)
  • brian Rupnow's Avatar
    09-19-2018, 03:04 PM
    So--an interesting comparison. In the first video, using a newly sharpened carpenters saw, the saw took 7.2 minutes to cut thru the log. In the last...
    115 replies | 6448 view(s)
  • brian Rupnow's Avatar
    09-19-2018, 02:51 PM
    Good wife has a set of wooden coasters already--a bit better fit and finish than these new ones--:):)
    115 replies | 6448 view(s)
  • brian Rupnow's Avatar
    09-19-2018, 12:48 PM
    This will be my final video of the drag saw, and I am deeming it a success. It cuts logs the way it is supposed to, and the engine has ample power. ...
    115 replies | 6448 view(s)
  • brian Rupnow's Avatar
    09-18-2018, 05:36 PM
    John--The only down force on the blade is gravity acting on the saw blade and the parallelogram arms. I think this is one of the things that doesn't...
    115 replies | 6448 view(s)
  • brian Rupnow's Avatar
    09-18-2018, 03:23 PM
    I installed the new saw blade, drilled a few cosmetic holes in the dog clutch handle, and put a very weak tension spring on the dog clutch handle to...
    115 replies | 6448 view(s)
  • brian Rupnow's Avatar
    09-17-2018, 04:48 PM
    I just went downtown and spent $12 of the Rupnow fortune on a saw with a really radical tooth profile on one side. Tomorrow we will see about...
    115 replies | 6448 view(s)
  • brian Rupnow's Avatar
    09-17-2018, 12:16 PM
    So--Today the drag saw cut it's first log. Everything went very well, except that I need to get a more aggressive blade. About half way thru the log,...
    115 replies | 6448 view(s)
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About brian Rupnow

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Date of Birth
July 7, 1946 (72)
About brian Rupnow
Biography:
I am 69 years 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 50 years experience designing prototype machinery and factory automation

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Brian Rupnow

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