Gallery, Projects and General > How do I??

Tailstock Tapers

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Darren:
My S&B tailstock taper is 1MT, it would be much nicer if it was 2MT to match my other machines.

Assuming there is enough meat in the sleeve is it a feasible job to undertake and if so How would you go about it?  :scratch:

bogstandard:
Darren,

Opening out to a larger size isn't usually a major problem. Just the reverse of how I cut the drill chuck taper.

You have to make sure you would have enough travel on your topslide to cut the whole length of the taper. I have a 1 to 3 set of MT reamers to finish it off if required.

The major problem is the tailstock itself. If it has a tang lock to stop the MT rotating, plus the auto eject mechanism, both those are geared up for a 1MT length. The 2 MT will require differing dimensions for both of those items, and might require a longer tailstock ram to be made for both those items to be correctly utilised.

You could easily use an extension socket to do the job, but it would mean a rather large overhang sticking out of the ram nose.

http://www.arceurotrade.co.uk/Catalogue/Extension-Sockets

John

Darren:
Thanks John,

I've now taken the tailstock apart and had a good look at it. There is no tang retainer, the ejection system uses the end of the leadscrew. Except it isn't long enough so it doesn't eject. Fortunately I can remedy that by tapping the end of the leadscrew and adding a bolt thus making it adjustable. The lathe was probably never originally designed to use a tailstock as it has a huge well made multistage turret and as such the tailstock is very basic. Doesn't have any adjustments at all for setting over or aligning.

With the ram out on the bench it's now looking like it is too small a diameter to bore it out to MT2. The ram is 0.9990" and it has a slot to stop it rotating effectively making it around 0.8000" of meat. I measured an MT2 arbour at the thick end at 0.700 ish and 0.640" around the center area of the taper. So it's a no go I would think.



However, the internal taper looks a tad damaged which would prob explain why my arbours rotate if given a little stick. Therefore would you mind if I brought the ram along with me for a quick clean up when I come over to yours? I'm hoping next weekend if that's OK?

One bonus, I had a look at the tailstock for the Union lathe. Remember that rusty thing I was playing with not too long  that I still need to set up. Well it had an MT1 half dead center in it......can stop using the center punch as a center now.  :lol:

sbwhart:
Nice find with the centre Darren

I'll Pop over when your at Johns if thats OK and have a chat.

Cheers
 :wave:
Stew

Darren:
Look forward to it Stew, fingers crossed I'm planning on next Sat if ok with John.

Yep a lucky find, but I should have known I had it though  :doh:

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