Spindle nose size

I have a MK practical 1550 lathe & I need to centre the tail stoke to the centre of the spindle, I have taken the chuck off & taken a measurement @ the end of the nose 44.25mm & at the back it tapers down to 43.25mm. In the manual it words Spindle nose D1-4" or A2.4". Nose MT3 bore 1-5/8" can any one tel me the correct size for a tapered centre for this size taper please. Rob

Think you have measured it wrong.

It is a D series camlock and if the book says D1-4 probably is but a D1-4 if 63.5mm at the largest part of the taper.

No D series is 44 odd mm

Yes point taken, but the Manuel gives 2 figgers A2.4" as well, so could ether be fitted? what is A2.4" ? And it states 1.5/8" I measured it with a bore gauge.

Rob

Read the bottom of this page.

You measure across the tapered register, not the bore. The bore size has nothing to do with the chuck.

**LINK**

An A series chuck is a bolt on table just above the bottom link I have given.

Don't understand what you mean John, Rob's measurements are the inside of the spindle, have spoken to him and he measured it three times so that should be ok, what to MT tapers go up to.

Al.

Don't understand what you mean John, Rob's measurements are the inside of the spindle, have spoken to him and he measured it three times so that should be ok, what to MT tapers go up to.

Al.

Rob if its a D1-4 spindle nose it's 100 to 1 that you need a number 5 morse taper sleeve to reduce down to a 2 or 3 MTcentre

Rick

Hi Rick wouldn't an MT5 have more of a taper than 1mm.

Al.

My bad, though he was asking about the chuck fitting not the spindle bore taper.

Re read the post and I now see what he wants so ignore everything I have said, most people do anyway

The size given at the end of the spindle matches up with a No 5 Morse but the inside measurement doesn't.

Thats what I thought John so any idea what it could be with such a small taper,

Al.

Hi

MT5 taper is 44.399mm at gauge line with a taper of 1:19.002 as given here.

Cheers

Martin

Don't you need to know the axial separation between the 2 diameters as well? You could have a stub version of a standard taper.

Keith

These taper bores are generally machined with a relief inbetween the taper at the front of the spindle and the remainder of the taper further into the spindle, completely unlike the taper in the tailstock barrel which is a continuously machined taper from front to back.

Rick

Sound like it's an MT5

rob

Yes, sounds like it.

Note that for D1-4, the diameter of the (external) conical taper is 63.5mm. If it measures 54mm, it's a D1-3. The Bantam also has an MT5, so clearly it's used on machines with both D1-3 and D1-4 and different spindle bores.

The critical dimensions for the MT bores are presumably the major diameter and the taper angle. Whether or not the bore extends the "full length" matters less.

Murray

I have an MT 5 dead center Rob you had better try it before you buy one , just to make sure.

Al.

Hi Murray" it's 44.25 not 54. D1-3 . it will be a chuck size D1-4 = 63.5 mm buts that's the OD of the spindle. I'm ID.

thank for your input.

Rob

Keith you could be onto something"" stub version, tel me more.

rob

If you really want to align the tailstock to the spindle, why not put centres in each and match the points? Or am I missing something here?

Gary

Gary, yes you are missing something.

He's trying to sort out what centre he needs for the headstock.