name that tool

[breezer]

okay I got this with a lathe I bought from one of the members on here.

It's a chuck of some description, with a morse taper which fits into the tailstock. But's unlike any chuck I've seen before and seems like a very heavy duty over-engineered solution fo simply holding straight shank bits.

Does it have another more specific use?

It has a hex formation which tightens up but it's not bigh enough to hold hex-shaped dies.

Answers on a postcard (or a stuck down envelope)

 

[rich74310]

Think it might be for Taps treading type

 

[Nimbus]

Yep - looks like it's for holding the square shank of a tap. I have something similar to hold dies to start them off straight.

 

[hareng]

Definately for square taps, have a load but are self centring unlike above fixed.
Same with die holders self centring on MT3 with rubberised bushes to suit application.

 

[HasBean]

Looks like an old two jaw drill chuck, found a piccy in my old Sparey's 'Amateurs Lathe' and 'Machinery's Handbook'.

Paul

 

[rtbcomp]

I've got something similar but smaller on an old flexible drive grinder.

 

[breezer]

I presme if it is for taps these would have a longer square shank rather than the 5mm or so a hand tap has?

It does self centre by the way

Cheers

Jim

 

[breezer]

Okay a bit of googling shows MACHINE taps with an all square shank (rather than a small square at the end of a hand tap shank)

So question #2 what are the benefits of such a chuck? I'm guessing more torque and perhaps that it will hold the tool in either forward or reverse?

Cheers

Jim

 

[shenion]

If you have a hand tap tool, you may notice there is a small hole in the tail end. This allows you keep the tap straight using a dead center in the tailstock (while holding the tap tool to keep it from spinning.) I have used it this way; makes much cleaner threads as the tap does not start at an angle..

Would be similar, it keeps the tap straight. I would imagine it much more useful with a turret tailstock that has a lever to advance the ram.