Gallery, Projects and General > How do I??
Leveling Denford lathe - has no levelling screws?
Will_D:
As we all know 3 point contact is perfect.
However if two points are fixed (end of bed and one at headstock end) then the third point ( adjustable jacking screw) should then be able to untwist the bed?
Will
loply:
Hi folks,
Well I finally finished rebuilding this lathe - fitted a new motor, all new electrics, replaced the gear head with a direct belt drive + VFD, added a lamp, hand scraped the saddle and compound, generally took every single thing apart and cleaned/lubed/rebuilt as required.
Lathe is turning really nicely but sadly is cutting a taper of 0.01mm per 25mm, ie half a thou per inch. Bit more than I hoped for! My last Viceroy lathe cut 0.00mm per 6 inches...
I tested this with a 7 inch length of 3 inch aluminum turned down in the 3 jaw. Pretty sure it's head alignment rather than bed wear or suchlike as the taper is so linear.
Maybe one day I will remove the head and rescrape/adjust to get it better. Will begrudgingly accept it for now!
Rich
loply:
Oh I also made and fitted way wipers, and ground oil grooves in the bottom of both sides of the saddle and cross slide, and inserted oiler points which feed straight into these oil grooves.
Alan Haisley:
--- Quote from: loply on December 15, 2015, 05:06:15 PM ---Hi folks,
Well I finally finished rebuilding this lathe - fitted a new motor, all new electrics, replaced the gear head with a direct belt drive + VFD, added a lamp, hand scraped the saddle and compound, generally took every single thing apart and cleaned/lubed/rebuilt as required.
Lathe is turning really nicely but sadly is cutting a taper of 0.01mm per 25mm, ie half a thou per inch. Bit more than I hoped for! My last Viceroy lathe cut 0.00mm per 6 inches...
I tested this with a 7 inch length of 3 inch aluminum turned down in the 3 jaw. Pretty sure it's head alignment rather than bed wear or suchlike as the taper is so linear.
Maybe one day I will remove the head and rescrape/adjust to get it better. Will begrudgingly accept it for now!
Rich
--- End quote ---
Which way does the taper run? Might it be worn chuck jaws?
DavidA:
I was thinking the same.
It's asking rather a lot of your chuck jaws to be more accurate than that.
Have you tried taking a cut across your face plate ? Or maybe just passing a dial g guage across it ?
If the cross slide is square to the bed then you should get a dead square cut or reading across the plate. Else it will be conical.
Dave.
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