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I think this will be the same for a 10EE https://www.practicalmachinist.com/forum/threads/cva-toolroom-lathe-%E2%80%93-apron-rebuild.399861/post-3950464 (post #20) Also, removing the apron there may be an oil pipe to disconnect although ISTR that later 10EE's have a transfer port rather than...

Mike (m-lud), the CVA oil pocket is approximately 1.25” x 1.63” and about 7/32” deep at the deepest point. It looks like it’s just a cast feature. Apart from the pipe holes none of it has been machined. How does that compare with the 10EE? The pipes are all 5/32” OD and about 3/32” ID. Trial 1...

Sorry to ask but have you got the feed reverse plunger in the central position? You shouldn't be able to engage the half nuts at all unless its in the middle, but I've seen a machine with the lower half-nut drive arm broken. Under these conditions the interlock won't work and you'd only be using...

With the oil pipes completed the half-nuts can be fitted. Reassembly is very straightforward but don’t forget the two sprung detents. One for the half nuts and one for the feed reverse plunger. On the front of the apron there’s a chromed bezel and operating lever secured with a taper pin...

Thanks for the kind words Mike.

The delivery pipe from the pump goes to a T piece. On CVA's this is held on by a single screw at an odd angle. For testing I have temporarily blanked the outlet that will eventually go to the saddle. With the pump and pipe in place the apron sump can be fitted. I made a gasket although there...

When needs must!! No heavy cuts tho! On balance I'll stick with my 4HP but you get the innovation prize.

Thanks for the replies folks. When the apron came apart there was a congealed mass in that pocket that I discarded without examination. With hindsight I should have studied it! Sorry, I should also clarify: The picture I posted is from a spare apron that has been cannibalised for parts. The...

Can anyone tell me what material I should be putting in here: I've searched and seen cotton waste mentioned. What is the function of this? Flow restriction? Any help appreciated. Martin.

Yes, I would think you'll have the earlier type of pump. I do wonder if the earliest CVAs were fitted with Bijur lubrication. Let us know what you find.

Dave: Cross-slide thrusts on CVAs are FT7/16. 7/16" ID 7/8" OD and 1/4" wide - Can someone say whether these are the same dimensions as 10EE's? https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw=FT7%2F16+thrust&_sacat=0

With all the shafts and gears in place the next thing to go back is the oil pump. Well perhaps ‘back’ is the wrong word since mine had no oil pump at all when I received it. At some point in it’s previous life the pump had been removed. Because the apron had suffered coolant damage it may be...

Continued from last post. Next to be fitted is the clutch for the cross-feed. This is essentially the same procedure as for the longitudinal clutch, but there are two more oil feed pipes that need to be fitted into the well first. One will feed the clutch and the other feeds the shaft with the...

I discovered that a shim washer was needed to prevent the back face of the large clutch gear rubbing against the edge of the housing. I can not really explain why both long and cross feed clutches were like this, yet those from the spare apron were not. Because the gear had been rubbing there is...

Replacing the apron internals, continued. Next to be refitted is the longitudinal feed clutch. Here are the component parts with the original thrust bearings. Unlike round dial10EE’s there is no need to put the large rack shaft gear in position before fitting the clutch. The apron castings...

Replacing the apron internals. The order in which I took the apron apart wasn’t ideal. So for re-assembly I did some ‘dry runs’ first using dummy ‘bearings’ made from light alloy with clearance (rather than interference) fits. In essence it’s really quite simple. Start at the bottom and work...

I’m rebuilding (slowly) a CVA in the UK. The apron is currently in progress and there’s a separate thread here about it. Because mine had suffered coolant damage I bought a spare CVA apron from a similar age machine with the intention of picking the best bits from both. I stripped and cleaned...

Setting the half nuts. At a first glance there does not appear to be any adjustment possible, but the pins that connect the half-nuts to the drive arms are 1/16” smaller than the holes. This gives some scope for setting the vertical position of the nuts so that they close uniformly on the...

The first parts to go back were the oil pipes from the metering valve to the distribution well, and from the well to the upper half-nut slide. The T piece had to be modified, as like the saddle oil system, I have replaced the original 1/8” BSP threaded metering units with current metric...

Well that's interesting. Judging by the pictures the arms are steel or cast iron with bronze bushes.