Thread: TOS dead centre removal...how!

Hi Phil,

My reading of the drawing says to use the lever to retract the center then wind the black knob in to push the center out.

For that whats worth

Though I'm not 100% sure that drawing is of that tailstock. there seems to be an extra bolt on the right have side for some reason

Stuart

Hmmm, I didn't try that Stuart.
I'll be giving that a crack on Monday and see what happens.
The extra bolt on the right hand side is the plug for the hydraulic hose to connect to. The drawing is plan view.

Phil

It's a bit hard to tell exactly how it works from the section drawing but it may be designed self ejecting when the lever is pulled all the way. If the centre has been in there a while it may require a bit of a tap to help it release.

That alloy front cap Phil is there any sign of slits in the shaft like a collett? It gives the impression it may unscrew to release. Although at that scale no threads or slits are shown.

I think Stuart has the right idea. I like the idea of a hydraulic tailstock on a grinder, it would make it real easy to adjust the pressure on the work. We have a Toyoda (the machine tool division of Toyota) grinder at work and it has a spring in the tailstock. Its a real pain to set for small parts.

Originally Posted by Techo1

It's a bit hard to tell exactly how it works from the section drawing but it may be designed self ejecting when the lever is pulled all the way. If the centre has been in there a while it may require a bit of a tap to help it release.

Hi Techo
the only problem is that the whole assembly including the black knob on the right hand side moves when the lever is pulled as far as it will go

Originally Posted by wheelinround

That alloy front cap Phil is there any sign of slits in the shaft like a collett? It gives the impression it may unscrew to release. Although at that scale no threads or slits are shown.

Hi Ray
I thought the same but there are no slits like a collet type situation and it wont unscrew.

Phil

Phil I think Stu has it of sorts, being hydraulic if you were to screw the knob first not after and then draw back that would extend the pusher more. Trying to screw the knob first may bring a greater resistance.

Thinking about it a little more... maybe forget the lever and just wind the knob....it should pull the quill back anyway. Something along those lines anyway.
I arrowed the thread the the knob turns to extract the center.

Of course don't forget to undo it a little, so you put the center back in

Stuart

[QUOTE=Steamwhisperer;1874783]Hi Techo
the only problem is that the whole assembly including the black knob on the right hand side moves when the lever is pulled as far as it will go


Yes, I think I can see where the shaft with the black knob screws into the barrel so when the tip of the shaft is screwed in to contact the end of the centre it should, in theory, push it out, if not, a bit of a tap should, even with the palm of your hand on the plastic knob.

It could be possible that someone has put a short centre in. If all else fails it should be possible to get the ejector rod out, measure things up and put an appropriate length spacer in or simply a rod and tap it out then investigate further. I have had that experience with an ejecting tailstock on a lathe.

Peter

Many many thanks gentlemen. I think I am beginning to understand that drawing a bit better too.
I started to unscrew the black knob and it released all pressure on the spring so I reckon if it is a short centre I could even insert a drift in and give it a gentle tap and hopefully not shear the retaining pin for the sleeve.
Screwing the black knob in it gets tighter and tighter until it locks up. This could then be hitting on the back end of the centre but seeing as it also retracts the sleeve I thought it could be hitting against the retaining pin at the extent of the back travel.
If all else fails I should be able to remove the retaining pin and withdraw the whole assembly.
I am keen to go in tomorrow (day off) and have a crack now

Phil

Originally Posted by Steamwhisperer

I am keen to go in tomorrow (day off) and have a crack now

Phil

Your game Phil newly married and all best take a bunch of flowers home if you do.

Originally Posted by wheelinround

Your game Phil newly married and all best take a bunch of flowers home if you do.

you may have been correct there Ray. I threw the suggestion in the ring and immediately erased any thoughts of popping into work right there and then
I fear a good dose of spousal abuse may have headed my way.
Best wait 'til Monday.

Phil

Always best to void 00 and being carted off ............how do I know experience