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13 foot disc becomes a 7 foot disc

Thanks Hugh!

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Steve Mason

04-15-2003 13:57:21

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Hi Guys,
Between this forum and the Farmall forum I have learned so much it just amazes me! I recently was in need of a small disc to pull behind my Farmall C. I was rather surprised to find that even IF I could even find a small disc it was going to be more money than I wanted to spend. I did find a pretty nice Kewanee 13' disc for $100 but it was too big for my old tractor. I would like to extend my gratitude to a regular poster on the yesterdays tractors forums - Hugh MacKcay - Hugh gave me the notion that I could create a good heavy duty 7' disc out of the 13'Kewanee. Having never attempted something like this before I was apprehensive but with Hugh's knowledge and encouragement I did it. I now have a nice heavy 7' tandem disc that matches up to my C almost perfectly! Hugh warned me it would be a lot of work and it was, but I have lots more time than money. The link below shows before and after pictures. Thanks for your help Hugh! And to the folks at yesterdaystractors.com for creating such a great web site. Rookies like me would be lost without this resource.

13' Disc to a 7' Disc

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Brent

04-18-2003 11:01:37

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Re: 13 foot disc becomes a 7 foot disc - Thanks Hugh! in reply to Steve Mason, 04-15-2003 13:57:21

Looks great to me! If anyone runs across an old AC disk, it is really easy to do this conversion. The AC I converted used to separate axles on each gang. I just chopped the frame between the two and in 1/2 an hour I was in the field with my new 8 footer!

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Steve Mason

04-18-2003 12:47:33

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Re: Re: 13 foot disc becomes a 7 foot disc - Thanks Hugh! in reply to Brent, 04-18-2003 11:01:37

Wow! I probably spent 12-15 hours doing my Kewanee conversion. If I ever have to do this again I'll be looking for an AC too!

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Hugh MacKay

04-17-2003 02:40:20

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Re: 13 foot disc becomes a 7 foot disc - Thanks Hugh! in reply to Steve Mason, 04-15-2003 13:57:21

Steve:
First let me say congratulations on that fine looking job of fabrication. I figured you were going to take a bit of heat on those arbor bolts. When we got started on this you didn't tell me you were going to be discing by the end of the week. Usually when I start one of these projects it's to be ready in 6 mos. Then when I run into something like a $100. a bolt threading job I can just set aside until I see a more economical way. When you told me what you did with bolts I assumed you did as Tom suggests, saving the threaded end and putting a new head on there. You however saved enough money that if the bolts give problems you can still go to that company Paul suggested and have new ones made up. That would have been my first suggestion once the $400. threading problem arose.

I was at a dealers yesterday, took a walk down that row of implements they have for 20-30 hp tractors. I think you are a whole lot better off with what you have than one of those discs. Blades on them so thin I bet my wifes fry pan would stand more, spacers 2-3 inches in diameter at disc blade and a 3/4" arbor bolt. I didn't ask prices but I bet a 24 blade 3 point hitch disc would put an awful dent in $1,000.

To the rest of you guys, when Steve decided to do this project. I did some head scratching, here I am in Ontario, Canada and he in Iowa USA trying to give direction over the net. Not exactly the best recipe for comming out of the project as friends. On Tues, Wed and Thurs last week we each had 2 e mail per day that more than filled the screen each time. By Thurs Steve was well into project. I never heard from him on Fri, Sat or Sun. On Sat I got curious and sent an e mail. Sun. am I said to my wife either things are going well with Steve's disc project or he is so annoyed with me I will never hear tell of him again. Then lo and behold on Mon morning came an e mail with 3 pictures of disc working in field. Steve and I had never met before, not even here at YT forums, We must live close to a 1,000 miles apart. I think he has a good disc, if he still has to spend money for arbor bolts it is economical.

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04-16-2003 14:27:04

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Re: 13 foot disc becomes a 7 foot disc - Thanks Hugh! in reply to Steve Mason, 04-15-2003 13:57:21

Pretty nifty...you did good! :-)

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dhermesc

04-16-2003 11:47:13

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Re: 13 foot disc becomes a 7 foot disc - Thanks Hugh! in reply to Steve Mason, 04-15-2003 13:57:21

All in all it looks like a nice professional job. Gives me ideas for some of the stuff I see selling thats to big and to cheap. If the shafts ever give you a problem I am sure there are plenty of broken ones laying around that could be adapted to you needs. You might keep an eye out for ones you happen by (in junk piles at auctions). I do recall we had one on a 12' IH disk welded by a metal shop that soldiered on for several years with no problems.

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Steve Mason

04-16-2003 12:19:53

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Re: Re: 13 foot disc becomes a 7 foot disc - Thanks Hugh! in reply to dhermesc, 04-16-2003 11:47:13

Hey dhermesc,
I am by no means a professional but I appreciate your compliment. I am finding that there a lot of these old discs around that are too big for an acreage owner and too small for today's farming needs. Seems the smaller discs 7-8' bring a lot of money around here - at least $500 and that's IF you can find one. I figure for the money I've got in this thing I can afford to replace a shaft if it ever becomes necessary. Sure was a fun
project! and I used the scrap iron left over to make a nice little drag to smooth the dirt behiond the disc!

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Steve Mason

04-16-2003 12:14:50

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Re: Re: 13 foot disc becomes a 7 foot disc - Thanks Hugh! in reply to dhermesc, 04-16-2003 11:47:13

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paul

04-15-2003 21:29:27

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Re: 13 foot disc becomes a 7 foot disc - Thanks Hugh! in reply to Steve Mason, 04-15-2003 13:57:21

I figured you would make it like an offset, & just use 1/2. How did you rethread the big rods?

--->Paul

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Steve Mason

04-16-2003 05:19:35

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Re: Re: 13 foot disc becomes a 7 foot disc - Thanks Hugh! in reply to paul, 04-15-2003 21:29:27

Hey Paul,
After I had the shafts stripped of the discs, spacers and hanger bearings I cut them to approx length and took them to a local machine shop to have the ends turned and rethreaded. The shop said it would take them 2 hours on each shaft at $50 per hour. That came to $400 - no way I could afford that. I got myself some grade 5, 1" bolts, cut off the heads and carefully welded them to the ends of the shafts. I was worried about how this would hold up but so far so good and I have about 6 hours of use on the disc. No signs of anything coming apart yet. Time will tell. $400 worth of machine work vs $8 for some bolts left me little choice since my CFO (aka - wife) has me on a pretty tight budget.

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Tom

04-16-2003 06:04:24

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Re: Re: Re: 13 foot disc becomes a 7 foot disc - Thanks Hugh! in reply to Steve Mason, 04-16-2003 05:19:35

Have seen many disk plows cut down in width. The secret is to leave the threaded, tappered end of the shaft alone. Cut the required amount from the other end, and weld a new end piece on it. The way you welded the bolt on will probably not hold up to serious plowing.

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Steve Mason

04-16-2003 06:17:24

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Re: Re: Re: Re: 13 foot disc becomes a 7 foot disc - Thanks Hugh! in reply to Tom, 04-16-2003 06:04:24

Hi Tom,
I thought about doing what you said but since my original intent was to have the shafts rethreaded by a shop I had already cut the threaded ends off.
In hindsight I should have checked with the machine shop as to cost before I cut the shafts.
I was careful to make sure that I had a good solid weld on those bolts with good penetration. I used 5/32" 6011 at 170 amps. I ground the welded end of the threaded stud to a deep bevel so I could get max penetration. Looking at how the disc will be used I can't say it will ever see 'serious' plowing as it is going to be used mainly for landscaping work. As I look at how the hanger bearings are arranged I can't really see how there is that much stress on the ends of these shafts. And there are only 6 discs per shaft. As I said in previous post - $400 for machine shop work vs $8 for bolts - I am more than willing to risk having to reweld at some point. Time will tell.
Thanks for your comments,
Steve

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paul

04-16-2003 08:25:53

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Re: Re: Re: Re: Re: 13 foot disc becomes a 7 foot disc - Thanks Hugh! in reply to Steve Mason, 04-16-2003 06:17:24

Thanks for the explination. :)

Hitting rocks puts quite a stress on the shaft. They need to be torqed really tight, stretched really, which also puts a stress on them. Most disk shafts are heat treated, so welding on them is a bad thing, makes that one spot soft & gets all the abuse - shock, flexing, stress. Never good to weld on a disk shaft. When you turn with the disk down, that end blade gets tremendou stress, which is right near the weld.

In your situation & on such a light unit, I understand your fixit & should probably work out. On anything bigger, there will be problems. Just a heads up for others working on a disk. Cutting the other end off, heating it & hammering it into a mushroom endcap is a prefered way, altho you do take the temper out that way as well.

Shoup custom makes disk shafts, might be cheaper than rethreading what you had....

--->Paul

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Steve Mason

04-16-2003 08:37:49

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Re: Re: Re: Re: Re: Re: 13 foot disc becomes a 7 foot disc - Thanks Hugh! in reply to paul, 04-16-2003 08:25:53

Thanks for the info Paul - always happy to learn as much as I can about these things.

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paul

04-16-2003 20:49:59

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Re: Re: Re: Re: Re: Re: Re: 13 foot disc becomes a 7 foot disc - Thanks Hugh! in reply to Steve Mason, 04-16-2003 08:37:49

You sure did a nice job with it, looks really good! Nice work.

--->Paul

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