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Thread: More New Visby questions
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17th Jul 2019, 03:31 PM #46Most Valued Member
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- Jul 2016
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- Melbourne
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- 1,522
One thing that has really caused trouble for me is when a keyed shaft has twisted at the exit of a gear bore, even a very slight twist can lead to total binding. I have had to cut through shafts a few times because of this with single ended hacksaws. Its pretty miserable.
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17th Jul 2019, 04:00 PM #47Most Valued Member
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- May 2011
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- Murray Bridge S Aust.
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20190716_204355.jpg20190716_204447.jpg
In these 2 pics, it appears to me to be threaded in there, try unscrewing these before going any further with the knocking them out.
Have seen where the shaft has shoulders on them to hold the gears in place, and the bush is screwed in place to hold everything in place, with a type of preload.
HTH
KrynTo grow old is mandatory, growing up is optional.
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17th Jul 2019, 05:09 PM #48Most Valued Member
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- Jun 2007
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- sydney ( st marys )
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Have you removed both gaskets?
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17th Jul 2019, 10:00 PM #49Senior Member
- Join Date
- Dec 2011
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- Rosebery/Eastlakes
- Posts
- 115
I guess that is a distinct possibility.. I am going to try to fabricate a screw clamp type arrangement to press the shaft out.. I just have to hope that I push the right way as both ends of the shaft are different diameters and I'm not sure if there are any shoulders on the shaft. I really want to avoid having to cut the shaft..
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17th Jul 2019, 10:11 PM #50Senior Member
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- Dec 2011
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- Rosebery/Eastlakes
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- 115
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17th Jul 2019, 10:14 PM #51Senior Member
- Join Date
- Dec 2011
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- Rosebery/Eastlakes
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- 115
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18th Jul 2019, 02:07 AM #52
Hi Flo,
Have you removed these fasteners ?
20190713_170406.jpg
Circled in red.Best Regards:
Baron J.
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18th Jul 2019, 11:00 AM #53Senior Member
- Join Date
- Dec 2011
- Location
- Rosebery/Eastlakes
- Posts
- 115
Yes I have. The one on the left is literally only in a couple of threads so it didn't get lost. The one on the right was missing when I opened the gearbox. Those 2 set screws only serve to locate the bushings for lubrication purposes. They don't appear to key into a groove on the shaft.
My understanding is that there are 4 set screws which locate and lock the 2 spacers positioned between the #1 and #2 gear assemblies to limit gear end float. I have removed these set screws and the spacers are able to move slightly. I can't see any other grub screws that need to be removed..
I'm assuming that the gears are keyed onto the shaft as I can see a key when I move the spacers.. perhaps this key is damaged slightly or twisted as caskwarrior has suggested..
The journey of discovery continues...
Sent from my SM-N960F using Tapatalk
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18th Jul 2019, 11:59 AM #54New Member
- Join Date
- Sep 2016
- Location
- Vacy
- Age
- 46
- Posts
- 5
Good morning i have one of these fine lathes as well and have gone through a headstock strip down. The intermediate shaft gears are keyed to the shaft using woodruff keys, they are a very close fit to the shaft. My method of removal was to apply heat to the gears and tapping out the shaft, this will take a while as the heat will soak into the shaft and everything will tighten up again. Patience is going to be your friend here. As for driving the lathe i went with a 4 pole motor as opposed to the standard 6 pole and used a VSD to drive it, which greatly improved the flexibility.
Regards
Tom
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18th Jul 2019, 05:59 PM #55
Hi Flo, Guys,
Mmm, sounds like a bit of heat could be in order. That shaft must come out from one side or the other though.
One thing bothers me, if there are keys holding the gears to the shaft, how did they put them in there, in the first place. Do the spacers have slots in them for the keys to fit through ?
I can't see that the shaft would be assembled and then the bushings inserted, though why would retaining plates be fitted ?Best Regards:
Baron J.
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18th Jul 2019, 08:14 PM #56Most Valued Member
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- May 2011
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- Murray Bridge S Aust.
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- 71
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- 5,942
I've seen where a shaft is assembled inside a gearbox, then the bearings fitted.
I still say that the bush/s needs to be screwed out, it seems to be only half a thread showing, and a retaining plate/cover wouldn't be able to be screwed on that small amount. Plus why would they have 4 holes in the bush support.
KrynTo grow old is mandatory, growing up is optional.
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19th Jul 2019, 12:12 AM #57Senior Member
- Join Date
- Dec 2011
- Location
- Rosebery/Eastlakes
- Posts
- 115
I'm having similar thoughts about needing heat.
One thing bothers me, if there are keys holding the gears to the shaft, how did they put them in there, in the first place. Do the spacers have slots in them for the keys to fit through ?
I can't see that the shaft would be assembled and then the bushings inserted, though why would retaining plates be fitted ?
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19th Jul 2019, 12:44 AM #58Senior Member
- Join Date
- Dec 2011
- Location
- Rosebery/Eastlakes
- Posts
- 115
I'm not sure I follow you.. The thinner of the two bushes is already out.. it just slides out easily. The retaining plates are bolted in four places with a good 8 -10mm of thread contact on each bolt.
20190716_180639L.jpg
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20th Jul 2019, 11:43 PM #59Senior Member
- Join Date
- Dec 2011
- Location
- Rosebery/Eastlakes
- Posts
- 115
Well the journey of discovery continues and I am pleased to say that I won the battle! The answer to the mystery is the gears on this shaft are retained by their own woodruff key and the shaft comes out from the bed end.
I tried making a screw type press but it wasn't beefy enough and with the load that I was applying it started bending and the shaft didn't budge.. so ditching that idea I broke out the propane torch and with brute force I was able to inch the shaft out.. Interestingly, removing the shaft confirmed that this lathe is an 8.5" New Visby (pic 1)..
20190720_205021.jpg 20190720_205144.jpg 20190720_205151.jpg
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21st Jul 2019, 12:01 AM #60
Hi Flo,
That is brilliant Success at last. It is surprising what a bit of heat can do.
I hope that you have kept the keys that belong to each gear together. just in case...Best Regards:
Baron J.
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