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25th Sep 2019, 10:55 PM #1Most Valued Member
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Masport chipper/shredder shaft repair
Last time I used our 6HP Masport chipper I noticed it was a bit more rattly that normal, and found the pulley had a bit of play.
I removed the pulley the other night thinking that it was likely just a loose key and flogged out bore, but unfortunately its a steel pulley and most of the damage is to the shaft itself.
My plan at this stage is to build it back up with the welder, then somehow turn it back to size. I haven't checked yet if I can swing it in the lathe.
Any tips/suggestions on repair methods would be welcome!
Steve
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25th Sep 2019, 11:08 PM #2Most Valued Member
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If you can't fit it in the lathe. I'd slice the worn stub off, bore a hole in the remainder and pin and Loctite a new keyed end on. All doable with a boring head in your nice TOS
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25th Sep 2019, 11:19 PM #3Senior Member
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looks like the shaft is only held on with tacks of weld. Probably has a spigot also into the plate. Cut welds, make a new shaft and replace. Maybe use 1 or 2 roll pins instead of keyway. Looks like pulley might need a skim to true up also. Do it foirst and make shaft to suit new pulley ID +.0005 oversize
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26th Sep 2019, 09:22 AM #4Most Valued Member
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Thanks guys. I haven't checked properly yet how its constructed. There's definitely a full fillet weld around the shaft attaching it onto each plate but I'm not sure whether its just a full length shaft, or if there is perhaps a tube between the side plates with a shaft all the way through, or just stubs either side.
Making a new shaft or stub would certainly be easier than trying to repair/machine it as-is.
Steve
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26th Sep 2019, 11:54 AM #5Most Valued Member
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It would be an idea to use that as a jig to make a jig to hold the new shaft when fitting/welding it in
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26th Sep 2019, 12:14 PM #6Most Valued Member
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Hi Shed,
Is there a bearing on each side of that main assembly?
Can you make a new shaft that extends all the way through or will the flail blades hit it when they spin?
If you can make a new assembly with a single full length shaft then alignment issues will be easier to address.
SimonGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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26th Sep 2019, 02:29 PM #7Most Valued Member
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Hi Simon, I was looking at the pics on my phone earlier, now i am looking at it on the poota and see that the shaft does extend
through to the other side so no need for a jig, that makes it pretty easy.
Yes the blades need to spin through 360 degrees, so they need to miss that shaft and have plenty of clearance to allow for
the wear in the flail mounting hole and bolt.
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26th Sep 2019, 03:17 PM #8Most Valued Member
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Hi Shed,
A man of your capability should be able to make that assembly new and from scratch. I would start by machining the main shaft, finishing to the bearing ID sizing and then the keyway.
Then cut the two square end plates, tack weld together and machine to size. Use an edge finder to find the central location for the shaft and bore that hole. Then position the eight holes for the four shafts that hold the flail blades. Since most of the welding is not far from the axis of rotation and so hopefully with some care it won't need to be balanced once finished.
SimonGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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26th Sep 2019, 03:51 PM #9Most Valued Member
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26th Sep 2019, 05:18 PM #10Most Valued Member
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Oh buggar. I have just gotten confused over who the OP is!
Sorry Oxe.
Sent from my SM-G970F using TapatalkGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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26th Sep 2019, 05:53 PM #11Most Valued Member
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26th Sep 2019, 06:12 PM #12Most Valued Member
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26th Sep 2019, 10:12 PM #13
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26th Sep 2019, 11:05 PM #14Most Valued Member
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I checked tonight, and the shaft goes all the way through.
Filler welds on both sides of each side plate.
Good news is that it fits easily in the lathe. And yes, I will secure the flails appropriately beforehand !!!
I have a fixed steady to support the other end but it's not the the original for my lathe, just one I picked up along the way.
I've never used it before so it will need a riser plate and a wider clamp plate before I can use it. Its not the chipper shaft in the photo - just a dummy I chucked to get a feel for center height in the steady.
I could probably run the steady on the unworn part of the shaft where the bearing usually sits, but I'm a bit concerned about A. Not having enough travel on the adjusters, and B. The possibility of one picking up on the end of the keyway. Think I'll just grab a cheap bearing, mount that on the shaft before building it up and clamp the steady onto the outer race for turning.
Steve
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29th Sep 2019, 11:07 PM #15Most Valued Member
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Masport chipper/shredder shaft repair
A coupe of lumps of hot rolled scrap and some time on the shaper gave me these bits:
A spacer plate to go under the steady
A clamp plate.
I was expecting a machined surface on the bottom of the steady, but hadn't counted on it only being "partially" machined.
Another job for the shaper....
I'll get the chipper fixed eventually!
Steve
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