Re: Baseline / empirical testing Unimat 3 lathes and milling attachments
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Peter, In general these lathes get very little use and suffer little wear so I doubt you will experience any excess runout. Lathes are inherently accurate. If course gib strips etc might need slight tweaking to ensure smoth operation and lead screw handles adjusted to minimize backlash. If you really want to check for wear in the bearings you will need a precision ground test bar and a dial test indicator with mag base. May I ask what you want to do on the lathe ? If its clock making then you likely need the precision but other than that i doubt you need to be so strict with your tolerances ! It depends on what your end goals are, but if your new to the hobby just have some fun for the time being. Kind Regards, Paul.
On Tuesday, 14 March 2023 at 09:05:09 GMT, Peter Brooks <peter@...> wrote:
I didn't quite know what to call this post so I hope that is not too far off the mark...
Last year I acquired two Unimat 3 lathes and two milling heads. Once the workshop warms up a bit (not too long now hopefully!) I want to test them out to find out which set is the better (and sell the other).
What tests should I run? I'm guessing turning something and testing the runout will be one thing...
I have Emco three and four jaw chucks, an Emco ER16 collet chuck and will soon have collets with a specified runout of 0.005mm to 0.015mm if these would be of use in testing.
One of the lathes came with a manual and this has (handwritten inside) the part numbers of headstock bearings, so these may have been replaced on this item (or not, of course).
Any advice gratefully received!? Excuse my ignorance but I'm totally new to lathe work (and high accuracy metalwork in general :)
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