Need a sprocket to fit a tapered shaft
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Category: Allis Chalmers
Forum Name: Farm Equipment
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=147138
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Topic: Need a sprocket to fit a tapered shaft
Posted By: Adam Stratton
Subject: Need a sprocket to fit a tapered shaft
Date Posted: 02 Feb 2018 at 7:13pm
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I would think I could find what I want it I knew how to phrase what I was looking for... I am needing to repair a drive sprocket on a home-made feed cart. It was originally a flat chain drive sprocket that was on a keyed shaft that tapered from 3/4 up to 7/8. It drove a sprocket on a shaft that was tapered from 1/2 to 3/4. My grandpa had made it with parts from a deere 12a combine. The sprockets were cast and broke. I would like to convert it to roller chain while I am rebuilding it, but I can't find any sort of hub to fit a tapered shaft. Anyone know where to look? I realize I could have one machined if it came down to it, but was hoping for a ready made part. If anyone has any ideas I would appreciate it. Thanks! |
Replies:
Posted By: Gary
Date Posted: 02 Feb 2018 at 7:22pm
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Perhaps here: https://www.usarollerchain.com/roller-chain-sprockets-s/2432.htm" rel="nofollow - https://www.usarollerchain.com/roller-chain-sprockets-s/2432.htm |
Posted By: steve(ill)
Date Posted: 02 Feb 2018 at 9:16pm
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i doubt you will find the correct taper off the shelf. I would buy a sprocket the size you want with a bore the size of the small end of the taper. Then have a machinist bore the taper to the desired size. Use the old sprocket to get the dimension for the machinist. https://www.mcmaster.com/#roller-chain-sprockets/=1bei8mc" rel="nofollow - https://www.mcmaster.com/#roller-chain-sprockets/=1bei8mc ------------- Like them all, but love the "B"s. |
Posted By: DrAllis
Date Posted: 02 Feb 2018 at 9:23pm
| Use your tapered hub. Grind/machine off all of the old sprocket. Weld on a new bare sprocket onto the existing tapered hub. |
Posted By: HD6GTOM
Date Posted: 02 Feb 2018 at 9:24pm
| Adam. Our local welding shop carries a large selection of products like that. You might check with one close to you |
Posted By: Jacob (WI,ND)
Date Posted: 02 Feb 2018 at 9:34pm
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Would machining (or changing) the shaft to a straight shaft be an option? Then you should have many more stock sprocket options? Not being in front of what you are working on to see what you are up to, this is just an idea. ------------- Jacob Swanson 1920 6-12; 1925,1926 20-35 longfenders; 1925,1926 15-25's; 1927,1929 20-35 shortfenders; C; B's; IB; WC's; WD; WD45 |
Posted By: Unit3
Date Posted: 02 Feb 2018 at 10:13pm
I agree with the good Doctor. Sounds like you have what you need in your hand. Cut off the old and weld on the new. ------------- 2-8070FWA PS/8050PS/7080/7045PS/200/D15-II/2-WD45/WD/3-WC/UC/C |
DrAllis wrote:Posted By: dt1050
Date Posted: 03 Feb 2018 at 4:21am
x2. if your unable to to the welding and such, just take the two sprockets to the welding shop and they'll change them.
------------- Just cause it's orange don't make it a tractor, there's only one..Allis Chalmers |
Posted By: B26240
Date Posted: 03 Feb 2018 at 6:11am
| I would go with the machine shop route, they will need the old hub to set up the correct angle I think. Thirty min setup and five to cut the taper . |
Posted By: orangereborn
Date Posted: 03 Feb 2018 at 12:15pm
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Posted By: Adam Stratton
Date Posted: 03 Feb 2018 at 4:32pm
| I'll check on an old allcrop we have laying around. The old sprocket broke into half a dozen pieces when it went so using it as a center would be hard to do. Trying to make the shafts a straight shaft would be difficult too. Grandpa had used parts of 2 12a john deere combines and their bins to make a feed cart decades ago, and though I don't need it, i don't want to part with it either so would like to make it usable. Thanks for the suggestions. I hadn't thought about a taper not being standard. That's probably part of why I can't find one... Thanks again! |
Posted By: DrAllis
Date Posted: 03 Feb 2018 at 4:36pm
| Clamp the old tapered hub in a lathe and make it round again. Find a sprocket of the right tooth count and mate the two together. |
Posted By: DaveKamp
Date Posted: 04 Feb 2018 at 12:22pm
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As the DR said: Put the tapered hub/sprocket in lathe... cut off the sprocket. Turn a concentric land, and fit a roller-chain sprocket in it's place. You could probably face the old sprocket, and drill it to make the new sprocket BOLT on, which would save work and prevent distorting the new sprocket, and in the case that the hub is not-so-weldable, you're not welding it... If you have the shaft, then collet the shaft into the lathe, and put the sprocket hub back on the taper, so it all runs true in-situ. ------------- Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest. |
Posted By: DaveKamp
Date Posted: 04 Feb 2018 at 8:08pm
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And yeah, I'm probably seeming a little pushy in expecting that Adam would have a lathe... No, Adam- if you did, I'm certain you would've either already done this, or asked how we'd set it up if we were... but I'll bet that not too far from you is a tractor enthusiast that happens to have the machinery and ability to knock this out for 'ya, and not destroy a bank account doin' it. If you were my neighbor, I certainly would... ------------- Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest. |
Posted By: Alberta Phil
Date Posted: 05 Feb 2018 at 10:31am
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I'm thinking the old sprocket and hub may have been cast iron. Anyway, Adam said it broke into half a dozen pieces, so I think he meant the hub with the taper is broken up and therefore not re-useable. |
Posted By: Adam Stratton
Date Posted: 05 Feb 2018 at 10:57am
| Phil is right. The sprocket, hub and all, shattered when it broke and it is cast. I do have access to a lathe, but don't have a good way to make a key-way if I did get the taper cut correctly. I was hoping to find something ready made, but doesn't look like that's likely. I appreciate the suggestions. I will dig around some other old machinery to see what I can find and keep it flat chain if I can, other wise I will probably have to start from scratch to build both sprockets to something more modern... Thanks again |