Author Topic: Over Center manual cone clutch  (Read 1756 times)

Offline Brian Rupnow

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Re: Over Center manual cone clutch
« Reply #15 on: October 27, 2018, 06:04:14 PM »
All of the inner workings of the clutch are finished. The next step will be to make the outer housing of the clutch. I do have a spring, but it has to be shortened a bit.

Offline Brian Rupnow

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Re: Over Center manual cone clutch
« Reply #16 on: October 28, 2018, 04:50:38 PM »
Its been a very boring morning (cough-gag--bad pun). The boring went fine in the four jaw chuck of the lathe. I really don't like working inside something like that where I can't see whats happening. It just requires a lot of faith in the dials and digital read-outs. I have to buy a piece of aluminum big enough to make the other housing from.

Offline Brian Rupnow

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Re: Over Center manual cone clutch
« Reply #17 on: October 29, 2018, 09:35:14 PM »
As I work my way into this clutch business, I have to keep updating the solid models to reflect what I am actually building. This involves adding shoulder bolts at the pivots, and socket head capscrews and flatwashers, and a mechanism to dial in just how far "over center" I want the handle to move before locking up. I had to go to Toronto on business today, and then had a bit of real work, so nothing actually happened except updating the solid model.---Brian

Offline Brian Rupnow

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Re: Over Center manual cone clutch
« Reply #18 on: November 01, 2018, 07:49:37 PM »
Things are not happening at a blazing pace, but they are happening.  The second half of the main body is completed, and all of the bearings and spacers are loctited into place with a solid alignment rod thru everything until the Loctite sets up. Two of the external links are made and shown in place. All of the inside components are finished and waiting to be assembled. I have been sick with the sore throat from Hell, but will probably live thru it.---Brian

Offline Brian Rupnow

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Re: Over Center manual cone clutch
« Reply #19 on: November 02, 2018, 09:06:37 PM »
First results are in, and they are very positive. When the clutch is disengaged, there is absolutely no connection between the cone and the cup, and no drag at all. When the clutch is engaged, it locks up the cup and cone shafts. The pressure required to get the handle to "cam over" is quite small. I may rethink the adjustment I had modelled, because it looks like I can add one adjusting screw to the bar under the handle to limit how far it goes before it locks.

Offline crueby

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Re: Over Center manual cone clutch
« Reply #20 on: November 02, 2018, 09:39:13 PM »
Nice setup - looks like a very sturdy mechanism, looking forward to seeing it in action.

Offline Ye-Ole Steam Dude

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Re: Over Center manual cone clutch
« Reply #21 on: November 02, 2018, 09:59:07 PM »
Hello Brian,

Looks like a really clean design, I know you have a lot going on the inside, but it is a great looking unit.

Have a great day,
Thomas

Offline Bearcar1

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Re: Over Center manual cone clutch
« Reply #22 on: November 02, 2018, 11:04:04 PM »
THAT... Is pretty cool Brian. Nice work.  :ThumbsUp: :ThumbsUp:

Offline Brian Rupnow

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Re: Over Center manual cone clutch
« Reply #23 on: November 03, 2018, 03:25:32 PM »
I have changed the adjusting mechanism for the "over center" condition to something a lot simpler and less work. Sometimes when I am designing and building things, I will reach a point part way thru the assembly where I can see a better solution to a problem than I designed in the first place. This is not unusual, and as everything I design is a "prototype" it doesn't bother me. (as long as I haven't already made the part). The last thing I need to build is a baseplate which will allow me to bolt this clutch down to my worktable.

Offline Brian Rupnow

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Re: Over Center manual cone clutch
« Reply #24 on: November 03, 2018, 08:10:36 PM »
All I needed was a little nap. Woke up knowing how I was going to make the video.--Tomorrow---

Offline Brian Rupnow

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Re: Over Center manual cone clutch
« Reply #25 on: November 04, 2018, 07:15:51 PM »
Right on the cusp of an exciting new video---and one of my universal joints flew apart. Video will be delayed until Loctite holding one of the universal joint pins in place sets up. It's colder than a witches tit out in my main garage, and I've been sick for a week. Will put a heat lamp on the offending parts and maybe a video later today--maybe tomorrow. I do know this much---The flathead engine has enough beans to run the clutch mechanism in it's disengaged mode. I was just reaching to engage the clutch when the universal joint flew apart.

Offline Brian Rupnow

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Re: Over Center manual cone clutch
« Reply #26 on: November 05, 2018, 09:00:48 PM »
So, today we have the video I intended to make yesterday. The clutch operates just as I had hoped, and the video gives a good overview of the clutch in operation. I have a set of 21 engineering drawings of this clutch, which can be built using a small manual mill and manual lathe. I sell the plans for $25 Canadian funds, contact me at brupnow@rogers.com  The input and output shafts are 3/8" diameter, and both shafts ride on double sealed ball bearings. hope you enjoy the video.---Brian Rupnow

Offline Ye-Ole Steam Dude

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Re: Over Center manual cone clutch
« Reply #27 on: November 05, 2018, 10:04:22 PM »
Hello Brian,

That is a great build and it appears to work perfect.  :ThumbsUp:

Have a great day.

Offline crueby

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Re: Over Center manual cone clutch
« Reply #28 on: November 05, 2018, 10:46:03 PM »
Excellent!!

Offline Brian Rupnow

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Re: Over Center manual cone clutch
« Reply #29 on: November 06, 2018, 01:12:59 AM »
I knew the concept of the cone clutch would work, because I built one a few years ago which worked very well, except that it has a "dead" central shaft. I wanted to recreate it, only this time with a "live" central shaft, which offers more versatility. The big issue with any of these smaller "home brewed" clutches is how to keep them engaged or disengaged. If you don't have a lever with a shift gate which the lever snaps into, they have a propensity for jumping into or out of engagement, which can be quite alarming. The "over center" mechanism works very well to solve that problem. It is the same mechanical locking principal as is used on Destaco clamps. This will be my last clutch build for the foreseeable future.---Brian Rupnow