Hardinge spindle

Since the 5C collet size was *originated* by Hardinge, I believe that the spindle is directly machined to handle 5C collets, without an extra component as a closer. (Or do you mean the drawbar assembly?)

Note that on my Clausing (*not* a Hardinge), the original collet closer was a taper fit, and once a collet has been tightened in the closer, it is firmly in place, and will not turn.

It was designed to be removed by a protective collar which screws onto the spindle nose. To remove the closer, you unscrew the collar until it touches the back of the closer, and then apply some extra torque. This serves as a jackscrew to remove the closer.

The current spindle on that machine is now a L-00, and there is a similar spindle nose protector which is held in by a threaded ring, and which is unscrewed to pop the closer out.

Good Luck, DoN.

The standard Hardinge Collet Closer is nothing more than a tube that runs through the hole in the spindle. The far left end has the adjustment nut, the handle and bearing yoke, and an arm that attaches it to the rear of the lathe.

If there is No collet in the spindle, and it still will not move, then its likely the space between the draw tube and the inside of the spindle is filled with chips. Make sure the adjustment nut lock lever is OUT. Unscrew the allen screw you see just inboard from the end of the spindle nose..the pin that aligns the collet. Screw in a scrificial collet as far as you can, and hit it with a BFH.

gunner

I originally read this post as gunner did, that the

"DRAW BAR"

was stuck inside the bore of the spindle. You have read it exactly as written, where he said the

"COLLET CLOSER"

was siezed.

The original poster has to clarify what's stuck, and where. If it's the draw bar, gunner's solution will loosen it - although using a puller against the spindle would be better for the spindle bearings.

As DoN says, there is no separate closer at the front of the headstock. The end of the spindle accepts the collets directly.

Jim

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One more possibility (the OP says "it does not turn indipendently from the spindle") is that he hasn't released the little trigger that locks the housing at the back end of the headstock to the spline on the spindle.

Ned Simmons

He confirmed that it was the drawbar which was stuck, in private e-mail, and I sent him other suggestions -- including waiting for other responses from those who have actually used these machines.

That is one of the things which I suggested (in the e-mail) that he check. I see that he has not yet checked back into the newsgroup -- unless he has started a new thread to do so.

Enjoy, DoN.

There is significant space between the drawtube and the actual spindle bore, so friction welding is highly unlikely. You do know, that the drawtube only comes out of the left end of the headstock....

Id be tickled to know what you find when it finally comes out.

As to running it without a collet, it tends to make the end of the draw tube pentagonal shaped from the repeated banging around inside the spindle bore. Why five sides? Not a clue

But it only does so if its been run for years like that.

Gunner

Before today, there was probably only *one* person in the entire world who knew this fact. Now there's a bunch!

Jim

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Thanks for everyones support, I just got the draw bar out of the spindle damn it was tight. I used gunners BFH teqnique :-) Looked like a combination of rust and gunk that was holding it in there Once again thanks Martin