For taper turning between centres a radiused type R centre drill should be used. This allows the centres to correctly align with the tilted centre drilled holes.
Well done video Sir , it got me a little lost on the math, but in the end it made sense......Love that Triumph 2000 Colchester, and remember , the World Turns on Colchester Lathes.......love the Idea of the headstock center in the chuck as my old South Bend 13" does not have a spindle sleeve......you just solved a big issue for me......Cheers from an old geezer. in Orlando Florida, Paul
22:00 it could also be telling you the work piece is flexing in the middle too right? Perhaps it's best to measure 2 positions at equal distances from each centre to eliminate workpiece flex error.
Was a little disappointed you didn't explain the principles of the telescopic taper-turning attachment and it's advantages/disadvantages over the plain attachment you did describe. You also didn't mention the other disadvantage of the tailstock offset method, namely the greater propensity for 'springing', or 'bowing' when cutting long tapers on slender workpieces as the centre clamping forces are not co-axial. Also, the impossibility of using a travelling steady unless you cut the WHOLE taper in a second pass which would likely be mission impossible for the smaller hobby lathes. One final point, when cutting tapers between centres one of the dangers is that the workpiece centre hole rides on the shoulder which is why ball-nosed centres are often recommended.
For taper turning between centres a radiused type R centre drill should be used. This allows the centres to correctly align with the tilted centre drilled holes.
Well done video Sir , it got me a little lost on the math, but in the end it made sense......Love that Triumph 2000 Colchester, and remember , the World Turns on Colchester Lathes.......love the Idea of the headstock center in the chuck as my old South Bend 13" does not have a spindle sleeve......you just solved a big issue for me......Cheers from an old geezer. in Orlando Florida, Paul
If l use tail stock off set for cutting a taper do l still use the center on the side of the tail stock
22:00 it could also be telling you the work piece is flexing in the middle too right? Perhaps it's best to measure 2 positions at equal distances from each centre to eliminate workpiece flex error.
Thank you for sharing the knowledge.
Thank you for posting this video - exactly the kind of information I was looking for.
Just I want!Thank you so so much!
Was a little disappointed you didn't explain the principles of the telescopic taper-turning attachment and it's advantages/disadvantages over the plain attachment you did describe. You also didn't mention the other disadvantage of the tailstock offset method, namely the greater propensity for 'springing', or 'bowing' when cutting long tapers on slender workpieces as the centre clamping forces are not co-axial. Also, the impossibility of using a travelling steady unless you cut the WHOLE taper in a second pass which would likely be mission impossible for the smaller hobby lathes. One final point, when cutting tapers between centres one of the dangers is that the workpiece centre hole rides on the shoulder which is why ball-nosed centres are often recommended.
Cutting tapers, D-d/L =taper