take up nut

[12bolts]

Hi all,
Not quite the right spot for this but I wanted a quick answer and I didnt want this to get lost in my lathe rebuild post.
On the "take up nut" on the spindle of my hercus 9" the face that pulls up against the headstock has a 5 mm dia. hole about 4mm deep drilled in it. Any idea why this may be here?
Also, the "take up washer" as found with this lathe has a papery texture. I am inclined to think this is probably not correct as I wouldnt have thought it would stand up to the continual rotation friction? Should it be replaced with a metal washer?
Bear in mind for those that may not have been following my rebuild thread, that this lathe was purchased as a basket case in pieces and is made up of at least 3 different machines.



Cheers Phil

 

[Chazz]

Yep, I agree with Rusty, the hole is for tightening\loosining the nut by tapping on a 'pin' punch or screwdriver. As to the washer, I have no idea as none of my lathes have a 'fiberesque' type washers.

Cheers,
Chazz

 

[jocat54]

The hole in the split nut is where the fiber washer pin goes, at least on my southbend 9A. The fiber washer has a locating pin ot lock it in place. I replaced my fiber washer with needle bearings from Mcmaster.com.

 

[12bolts]

Thanks all for the replies.
--->Rusty, I had no problems with disassembly, the lathe was already in pieces. The other post you pointed me to is exactly it. I am going to town this AM and try to get that bearing to replace the washer.
--->Chaz, the hole is on the bearing face of the nut so not for tightening/loosening.
--->jocat54, Does the fibre washer have a fibre tab to fit the hole or a pin set in it? The washer on mine is more like gasket paper, about 20 thou or so. Not really "fibrous" and certainly wouldnt be strong enough to support a locating pin.

Cheers Phil

 

[jocat54]

Phil, my fiber washer has a pin built into the fiber washer, never measured the washer but it is probably 1/16".

The needle bearings from McMaster are really pretty cheap, about $10 for the bearing and two washers.