Hi Guys,

I decided to install my ER32 collet chuck the other day to do a small job and realised that all the tiny bits of swarf landed all over the spindle nose threads and register. Not only do they scratch the register when cleaning them off but they are quite hard to remove from the threads even with a tooth brush. I've heard too many tragic stories of people struggling to get the chuck off the spindle and doing damage to the back gears and other parts of the lathe.

I had a short piece of Nylon 60 that was 50 mm diameter ! So I decided to use it to make a spindle nose protector. Now the Myford S7LB has a Whitworth, 1.125" inch by 12 tpi spindle thread, so it was no problem facing off the Nylon and drilling a 1" inch hole through it. I then bored it out to 1.080" Based on 50% engagement. Then I single pointed it from one end to the other using the threading tool upside down and from the inside towards the tail stock. I did wind the saddle back by hand after threading at around 270 rpm.

Having checked the threads with a plug that has the correct thread on it I then bored it out to suit the spindle register to a depth of 1/2" so the the new protector would screw on right up to the register seat.

Now before you guys have a laugh at my expense ! I screwed the protector on to the spindle and it fits exactly as it should
But there is a problem... I now can't get it to unscrew Yes, I did lubricate it first !

It went on real nicely by hand and tightened up against the spindle face !!!

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This is the spindle nose on my Myford S7LB.

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These pictures show the threads and the recess for the register.

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Last but not least the protector firmly stuck on the spindle nose. I put it on there by hand and expected to be able to unscrew it just as easily. But not so it appears.
Attached Images




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