It looks worse than it is. Yer it's a tidy ol weight but the time the lathe is bolted down it's very ridged.I'd be having kittens trusting in that, personally. A piece of 3"x2" at least would be under there, just incase.
A part of the thread has been broke off .I have a spare but that's just as wore out as this one.If its just the end bit will it not clean up with a die or thread file
No backlash adjustment on the nut mate?I have temporary fixed it. It's not the best but gets it working for now. But it's definitely going to need a new nut and screw as it's fairly shot. There is more backlash in it than my old woman when I bring home new stuffView attachment 148093
No mate. It's proper shot to be honest. But need it working for making the taper cone clutch for the power cross slide gearNo backlash adjustment on the nut mate?
thats probably the method im going to use to make some spindle thread protectors for my lathes.Is the backlash constant across the full travel (worn nut) or does it tighten up at extremes (worn screw or both)? If it's just the nut that's worn (usually is, bronze nut on steel screw) you could try the "Evanut" process of moulding a replacement around the screw - have a google, it's surprisingly simple to do (a lot easier than threading a piece of bronze with an internal, coarse, Acme thread, anyway!)
The original thread, saved on another site: http://www.denfordata.com/bb/viewtopic.php?f=50&t=3727
And another take on the process: http://bbs.homeshopmachinist.net/threads/43811-Acetal-Ball-Screw-nuts
Dave H. (the other one)
Both the screw and nut are shot to be honest .I will at some point take it out and run it in to my local machine shop and get them to machine up a new one.Is the backlash constant across the full travel (worn nut) or does it tighten up at extremes (worn screw or both)? If it's just the nut that's worn (usually is, bronze nut on steel screw) you could try the "Evanut" process of moulding a replacement around the screw - have a google, it's surprisingly simple to do (a lot easier than threading a piece of bronze with an internal, coarse, Acme thread, anyway!)
The original thread, saved on another site: http://www.denfordata.com/bb/viewtopic.php?f=50&t=3727
And another take on the process: http://bbs.homeshopmachinist.net/threads/43811-Acetal-Ball-Screw-nuts
Dave H. (the other one)
Had a fantastic day Pete. And totally appreciate your time in showing me how it's done. I looking forward to perfect the technique and hopefully produce work worthy of your standards.Shoulders aching today?
Spencer spent most of yesterday at mine learning to hand-scrape. I have to say, it was a real pleasure having such a willing and attentive student. He grasped the basic principles of inspection, alignment and a bit of machine assessment, then hand-scraped a scrap block of cast iron to get his technique going whilst I did a bit of work on a straight edge I'm scraping.
We found several quite significant but easily-fixed problems with his cross- and compound-slides. The main thing was that the two home-made wedge-keys that clamp the compound swivel had raised quite a lip on the edge of the slot, causing the compound swivel to rock slightly on the pivot. We also found that the cross slide ways had the typical wear on the ends though thankfully the dovetail flats were in very good fettle. I think Spencer scraped the cross slide/saddle ways, compound slide swivel and the underside of the compound slide. The cross slide came out very well indeed with a nice smooth action, no sideways slack and no sign of lift. Not bad considering that when we started you could make it clack against the ways by hitting two of the four corners with your hand.
Yes mate definitely. Pm me if you can find out what he has.@spencer 427 I may have a guy with some mellor spares/accessories, would you be interested?
Can you explain what you scrape these too, is it to each other or to some flat surface? Ive only really scraped flat using a surface plate, or bearingsAs it's been raining here so I couldn't get on with much. I spent the afternoon scraping in the other side of the Mellor compound slide. Happy days.View attachment 154226 View attachment 154227 View attachment 154228