Needs Pictures: 0
Results 31 to 45 of 78
Thread: More New Visby questions
-
9th Jul 2019, 09:43 PM #31Most Valued Member
- Join Date
- Jul 2016
- Location
- Melbourne
- Age
- 35
- Posts
- 1,522
I know that Purcell and the machinery dealer Demco were owned by the same extended family I think.
Sent from my Nokia 8 Sirocco using Tapatalk
-
14th Jul 2019, 02:20 PM #32Senior Member
- Join Date
- Dec 2011
- Location
- Rosebery/Eastlakes
- Posts
- 115
Low gear and selector dog update
Yesterday I got stuck in and removed the spindle in order to attempt the salvage of the selector dog. I was successful with the removal process and am working things out as I go as I have no workshop manual or other documentation.. I digress..
As you can see the selector gear is heavily worn. The gear has 2 key ways machined into it so I might be lucky enough to rotate the gear to utilise the additional key way in order to access good teeth. The other option would be to build up the damaged teeth with some silicon bronze and get them machined to restore their profile. I'm favouring the first option at present.
20190713_170406.jpg20190714_124410.jpg20190714_124453.jpg
I removed the low gear and selector dog and set about trying to separate them. Thankfully the welds were poor and with a some careful grinding and a couple of sharp blows with a rubber mallet I was able to liberate them!!!
20190713_175837.jpg 20190713_180048.jpg
A couple of the corners of the drive dog teeth on the low gear broke off in the process and so I might try building them up with silicon bronze.
20190713_180505.jpg20190714_124214.jpg20190714_124229.jpg
All told, after a bit of a clean up they don't look too bad and I think they'll be fine for my purposes.
20190714_124144.jpg20190714_124128.jpg
Flo
-
14th Jul 2019, 05:46 PM #33Most Valued Member
- Join Date
- Jul 2016
- Location
- Melbourne
- Age
- 35
- Posts
- 1,522
What are the gear specs? I'm sure you can just buy a stock gear or get one made. No way repairing that will be cost effective. Good job saving the collar.
Sent from my Nokia 8 Sirocco using Tapatalk
-
14th Jul 2019, 05:59 PM #34Philomath in training
- Join Date
- Oct 2011
- Location
- Norwood-ish, Adelaide
- Age
- 59
- Posts
- 6,561
I agree. Good save.
Hard to know what came first - some gorilla swinging on the handle, mashes the teeth so the lathe is welded 'in range', or the welding is done for some reason and the gear gets mashed up when someone tries to change it.
I think the silicone bronze to build up the clutch teeth should work. For the gear, I half agree with Ralph - I would not waste time building up and then machining. For a gear that size, I'd just make a new one.
Michael
-
14th Jul 2019, 10:19 PM #35Senior Member
- Join Date
- Dec 2011
- Location
- Rosebery/Eastlakes
- Posts
- 115
Hi Ralph,
The gear is approximately 2" diameter by 2" long, 18 teeth with a 5/8" (0.625") bore.. It doesn't look to be anything special. I do have the option of trying to mount it using the alternate keyway which might give me access to good teeth .. And I was fortunate that the welding job was terrible..
20190714_124453.jpg
-
14th Jul 2019, 10:58 PM #36Senior Member
- Join Date
- Dec 2011
- Location
- Rosebery/Eastlakes
- Posts
- 115
Hi Michael,
Yeah I have no idea... the backstory for this lathe must be interesting as there is obviously a reason for the welded clutch/collar.. still I'm very happy that I was able to separate it and I think the silicon bronze repair for the clutch should work.
I agree re the gear.. it doesn't look to be anything special. I might just try rotating it to use the other keyway.. I think that should give me good teeth.. otherwise a new gear will be on the cards.. Mind you with the spindle out the best time to change it is now..
-
17th Jul 2019, 12:25 AM #37Senior Member
- Join Date
- Dec 2011
- Location
- Rosebery/Eastlakes
- Posts
- 115
Since I have the headstock open and the spindle out I'm wanting to pull everything out and have a good look at it. I tried to remove the intermediate shaft (my terminology) but it won't budge. I have removed all machine screws that I can see which could be restricting movement and given the ends of the shaft a couple of decent blows with a hammer and brass drift. The bronze bearing sleeve (bushing) at the change gear end appears to be worn eccentrically which could indicate a slight bend in the shaft. I need to replace this sleeve and check the shaft as the wear and subsequent oil leakage will only get worse with continued use.
20190716_204355.jpg20190716_204447.jpg
20190716_204512.jpg20190716_204546.jpg
The machine screw on the left of the picture is only engaged by a couple of threads and is not interfering with the shaft. I have also removed 4 machine screws from the 2 spacer collars between the big gear (which I'll call gear #1) and the gear next to it (gear#2). Each spacer is secured by 2 machine screws located 180 degrees apart. I can't see any other fasteners (pins, screws etc) that need to come out. Looking in the gap between the spacers I can see a key which obviously locks the gears onto the shaft but what am I missing? I don't believe that the gears would be an interference fit on the shaft and yet when I hit the shaft with the hammer and drift it barely moves an sounds pretty solid. I'm loathe to really belt it as I fear breaking something..
Any suggestions?
-
17th Jul 2019, 03:09 AM #38
Hi Flo,
Carefully check for a second grub screw below the first !Best Regards:
Baron J.
-
17th Jul 2019, 08:15 AM #39Golden Member
- Join Date
- Jun 2004
- Location
- Kyabram. Vic
- Posts
- 632
As JB said. Hardinge used 2 grubs screws most if not all the time.
Ken
-
17th Jul 2019, 10:03 AM #40Senior Member
- Join Date
- Dec 2011
- Location
- Rosebery/Eastlakes
- Posts
- 115
-
17th Jul 2019, 10:10 AM #41Senior Member
- Join Date
- Dec 2011
- Location
- Rosebery/Eastlakes
- Posts
- 115
Hi Ken,
There didn't appear to be 2 screws in any position as each screw was quite long (15-20mm) and was bevelled at the contact end to mate into a receptacle- similar to a hydraulic fluid nipple. Having said that I will have another really good look as the shaft won't budge.. something is definitely stopping it..
Flo
Sent from my SM-N960F using Tapatalk
-
17th Jul 2019, 10:59 AM #42Most Valued Member
- Join Date
- Jul 2016
- Location
- Melbourne
- Age
- 35
- Posts
- 1,522
I have had problems in situations like this with burrs raised by people gronking down on the set screws with the shaft out of alignment, this gaulling can lock things solid and can be really hard to deal with.
Can all the gears wiggle back and forward?
-
17th Jul 2019, 12:07 PM #43Senior Member
- Join Date
- Dec 2011
- Location
- Rosebery/Eastlakes
- Posts
- 115
The #1 and #2 gears (the 2 biggest gears) are locked solid but the spacers between them as well as gears #3 and #4 can wiggle on the shaft..
I have tried tapping the big gears around their periphery with a brass drift to try to unseat them but no success as yet..
Sent from my SM-N960F using Tapatalk
-
17th Jul 2019, 02:41 PM #44Most Valued Member
- Join Date
- Jul 2016
- Location
- Melbourne
- Age
- 35
- Posts
- 1,522
So can you spin the shaft and gears at all? is everything stuck in terms of rotation or just end float?
If the shaft wont rotate in its bronze bushings i think youll have to get drastic, I would consider tapping a hole in one end for a slide hammer. Or make a puller. I prefer a strong but gentle force to hammering anything, I see one of the bushes already has dings in that might be holding the shaft in.
-
17th Jul 2019, 03:23 PM #45Senior Member
- Join Date
- Dec 2011
- Location
- Rosebery/Eastlakes
- Posts
- 115
The whole shaft assembly rotates freely as it should but the 2 big gears are locked onto the shaft with nil apparent end float. The 2 smaller gears exhibit some end float as do the 2 spacers.
The bushing at the bed end of shaft ( the one with the dings) can migrate and is able to be removed whereas the worn bushing at the change gear end is fixed.
And like you I'd prefer to press things rather than hammer I just don't quite know how to tackle it..
Sent from my SM-N960F using Tapatalk
Similar Threads
-
New Visby lathe.
By stix012 in forum METALWORK - Machinery, Equipment, MARKETReplies: 2Last Post: 30th Mar 2017, 01:42 PM -
New Visby cleanup
By morrisman in forum ANTIQUE AND VINTAGE MACHINERYReplies: 4Last Post: 10th Nov 2016, 10:22 PM -
New Visby on Gumtree
By j.ashburn in forum EBAY, GUMTREE, and other off forum sales sitesReplies: 1Last Post: 21st Jun 2014, 03:19 PM -
Visby lathe
By morrisman in forum METALWORK GENERALReplies: 6Last Post: 9th Oct 2013, 06:41 PM -
New Visby
By morrisman in forum METALWORK GENERALReplies: 2Last Post: 30th Nov 2011, 01:56 PM