Keyless chuck problems

[MattRoberts]

I've just purchased the 16mm keyless chuck 700405 and a B16 2MT arbor 700408 from axminster.

Unless I'm being very stupid, the arbor doesn't fit in the chuck. Both the chuck and the arbor have B16 written on them, but the arbor won't sink below the shoulder line. Please could someone advise what I'm doing wrong?

 

[Phil Pascoe]

Looks like it's designed for a drift to fit it.

 

[MattRoberts]

Sorry, what does that mean?

 

[CHJ]

Is the B16 taper mating firmly, why do you need the chuck to butt-up nearer to the Morse taper?

As phil. suggests it allows you to use a taper wedge to part the joint if necessary.

 

[MattRoberts]

The B16 isn't mating at all, it's completely loose all the way to the shoulder, to the point of rattling when wiggled

 

[CHJ]

In that case I'm sorry I interpreted your original explanation incorrectly.

Not much help this late on a Friday but I would suggest it's a 'phone call or message to Axminster support asking for an explanation as to why the two components supplied by them purporting to be to the same standard are not compatible.

 

[Phil Pascoe]

I was about to say the taper might be too long - but the shoulder seems to be in the right place. I'd give Axminster a call.

 

[MattRoberts]

In that case I'm sorry I interpreted your original explanation incorrectly.

Not much help this late on a Friday but I would suggest it's a 'phone call or message to Axminster support asking for an explanation as to why the two components supplied by them purporting to be to the same standard are not compatible.

No worries - more likely my poor explanation

I've emailed them to see what they say, thanks anyway

 

[NazNomad]

Make sure there's not a piece of crép down the hole in the chuck (a bit of swarf maybe?)

 

[Bod]

Both parts are absolutely clean?
No burrs, no anti-rust coating still in place.
Hole in chuck deep enough?
Distance to shoulder, same as chuck depth?
There isn't a left-handed screw in the chuck, is there, to mount it on a reversible drill? Probably not need on that arbour.

Bod

 

[MattRoberts]

Make sure there's not a piece of crép down the hole in the chuck (a bit of swarf maybe?)

Nope, all clear.

The best way I can explain what happening is to imagine you drop a big screwdriver into a dog hole. That's what it's like, completely loose, and goes up to the shoulder of the arbor without any interference fit at all

 

[MattRoberts]

Both parts are absolutely clean?
No burrs, no anti-rust coating still in place.
Hole in chuck deep enough?
Distance to shoulder, same as chuck depth?
There isn't a left-handed screw in the chuck, is there, to mount it on a reversible drill? Probably not need on that arbour.

Bod

Check check. No screw threads, they're tapered for a (supposed) friction fit

 

[Rorschach]

That doesn't seem right, it should be a snugish fit without any trouble.

When you do get it sorted, remember to put the arbour in the freezer and warm the chuck up before fitting.

 

[MattRoberts]

At least no one has pointed out a completely newbie mistake

I'll see what the axminster wizards say and report back.

 

[dowellturn]

Just checking your terminology: the B16 is the short taper and the morse taper is the long taper. Your morse taper is fitted with a tang, which is normal but can prevent a fit into some tailstock barrels.

 

[Phil Pascoe]

But that's not the taper that doesn't fit, it's the B16 in the chuck.

 

[Lons]

Matt
I'm confused a bit. Are you saying that 1). The chuck is loose on the arbor before fitting into the MT on your lathe or 2). is it the MT2 to lathe fitting that;s loose?

If the first then I'd send it back as has to be a good tight interference fit but if the second then either they've sent you a MT1 instead of 2 or more likely the shank is too long. I have several chucks and had to cut off the end of a MT to make it fit. Was an old one I already had so no issues.

 

[MattRoberts]

Matt
I'm confused a bit. Are you saying that 1). The chuck is loose on the arbor before fitting into the MT on your lathe or 2). is it the MT2 to lathe fitting that;s loose?

If the first then I'd send it back as has to be a good tight interference fit but if the second then either they've sent you a MT1 instead of 2 or more likely the shank is too long. I have several chucks and had to cut off the end of a MT to make it fit. Was an old one I already had so no issues.

Hi mate, it's number 1. The chuck rattles around loose on the arbor all the way up to the shoulder on the arbor (at which point it can't go any deeper).

The Mt arbor fits just fine in my drill press.

I've got a reply from axminster, but have to wait until Monday to speak to their chaps

 

[Phil Pascoe]

Sounds like the taper in the chuck isn't the taper you believe it is.

 

[MattRoberts]

Sounds like the taper in the chuck isn't the taper you believe it is.

It's not the taper I'm looking for... *sweeps hand*

It's just weird that they're both marked as B16...