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29th May 2019, 12:02 AM #1Senior Member
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New Visby compound slide disassembly advice
Hi Everyone,
I am wanting to disassemble the compound slide and give it a good clean because it barely moves. I removed it from the cross slide and have been soaking it in penetrene.
The total range of travel available is less than 10mm. There are a couple of issues immediately apparent. Firstly, there is a spring loaded poppet that is designed to allow registration of the tool post at 90 degree intervals. The poppet has compressed and is seized and it appears that the boss that it mounts into has migrated downwards and thus impedes the operation of the compound. Is this just pressed into place with an interference fit? Can I just drive it back to flush? Ideally I would like to remove the boss and retaining pin and free up the poppet.
Secondly, I have removed one of the gib screws but the screw at the wide end is bent and looks like it has sheared at some point. Also is it normal for machines manufactured in the 40's to have gibs that protrude past flush?
Any advice would be appreciated.
Flo
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29th May 2019, 12:29 AM #2Most Valued Member
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Hi Flo, I'd undo the gib screw/bolts and then see if it'll move any better, I think a lot of the problem is that the gib is rusted in place. If they're already damaged, you're going to replace them anyway, so it won't matter. They should have a locknnut to hold the screw in place.
KrynTo grow old is mandatory, growing up is optional.
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29th May 2019, 08:20 AM #3Philomath in training
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I'm not personally familiar with Visby lathes, just lathes in general, so I could be wrong but you look to have a couple of problems there. One is that the screw has lost its head, but the other is that the gib should have a protrusion (or two) that fits between the 'two heads' of the screw, so that as you wind the screw in and out, the gib moves. (the other common build is a screw at each end of the gib to adjust position. There should still be something for the screw to push against)
Some people have built damaged gibs like that up with brazing rod or Si Bronze. Others have put in a spring pin or similar. Not sure why there is a piece of shim in there either - could be that the gib is generally worn, in which case making a new gib may be on the cards. The reason that the current gib is protruding is probably the shim - without it, the gib is too short. You might have to play with shim sizes if you decide to leave that gib in place to get it into a more reasonable position.
Welcome to the rabbit hole.
Michael
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29th May 2019, 09:06 AM #4Most Valued Member
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Ha ha ha ha...... so true.
Last autumn I couldn't stand my Monarch compound any longer. That led to re-scraping its ways, making a new gib, milling and re-scraping the rotating surfaces between the compound and cross slide plus a q&d re-scrape of the cross slide flat ways. I quit at that point because I wasn't ready to tackle a full-on re-scrape of the saddle and cross slide ways.
It's vastly improved but quite a bit of time went down the rabbit hole.....
PDW
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29th May 2019, 10:27 AM #5Senior Member
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- Dec 2011
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- Rosebery/Eastlakes
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- 115
Hahaha!! Yeah I am well and truly in the rabbit hole. The gib appears to have the cutout that you mentioned Michael but the screw head appears to have shared and the remainder looks bent.. I think I'll end up having to drill it out and make a new one..
I don't have a mill so making a new gib will be problematic.
In terms of the tool post poppet boss - are they just an interference fit? Can I remove it (for repair) or at least make it flush without causing any other issues?
Flo
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29th May 2019, 04:31 PM #6Most Valued Member
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My old macson had the same spring plunger and it was just an interference fit, should move with a swift wack no problem
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29th May 2019, 04:36 PM #7Senior Member
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29th May 2019, 05:01 PM #8Most Valued Member
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I had to Loctite mine in to prevent it rising, it comes from trying to lock the turret at anything other that a 90degree increment.
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29th May 2019, 05:05 PM #9Senior Member
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Does it make much difference if it just remains flush so that it doesn't register the turret in the 90 degree position? In other words should I worry about repairing it?
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29th May 2019, 05:07 PM #10Most Valued Member
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I found it pretty helpful, but totally up to you, it was kind of handy to have a parting tool on one side of the turret so it was always registered without you having to line it up every time.
This system makes it a lot harder to fit a qctp when the time comes as the hold down bolt on mine was integral to the compound.
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29th May 2019, 10:40 PM #11Senior Member
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Well I managed to get it out and disassembled. I gave it a bit of a clean up and lubricated it and the plunger is operational again. I haven't reinstalled as yet though.
As for the tool post retaining bolt - on my lathe the bolt protrudes all the way through the top slide and is fixed in place on the underside of the top slide with a machine screw. I guess if I want to fit a QCTP and the standard bolt doesn't work it probably wouldn't be too hard to fabricate something to fit.
I also was able to remove the gib by removing the damaged adjustment screw. I had to drill the screw and use an easy-out (screw extractor) to remove it as the drive portion of the screw was missing. The gib is of the type that is notched at the big end. Once I removed the gib I was able to separate the compound into its various parts. The dovetails don't look too bad and I can still see evidence of the scraping. I'm not sure why there was a shim installed but I guess I'll find out when I reassemble it. I'll need to give everything a good rub with a stone to remove the burrs and corrosion pitting high spots.
The compound spindle nut was a bit tight but I exercised it numerous times with lubricant and whilst it's not perfectly smooth there is a definite improvement.
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29th May 2019, 10:55 PM #12Senior Member
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- Dec 2011
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- Rosebery/Eastlakes
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As an aside, I had the original toolpost from my step father's lathe left over after I fitted a QCTP to it and thought I'd do a side-by-side comparison with the toolpost from my 'new' lathe.. only a slight difference..
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30th May 2019, 12:00 AM #13Most Valued Member
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- Nov 2017
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- Geelong, Australia
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Tool post sounds similar to what a on my Takisawa lathe. Toolpost pivot bolt all the way through the compound slide, an interference fit but also secured by a grub screw from the bottom. It was drilled and tapped on the outer edge of the pivot post flange so one side of the grub screw is threaded in the top slide and the other half in the post.
I've measured up the topslide hole so I can make a new pivot holt to suit the QCTP I've had for a while. Just haven't made it yet!
Hers a couple of shots of the original.
Steve
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30th May 2019, 12:16 AM #14Senior Member
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- Dec 2011
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- Rosebery/Eastlakes
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Yes that's pretty much the same setup on this lathe as well Steve.. I haven't removed the pivot bolt but I can if I want to..
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