Eagle Surface Grinder Model 3 Rebuild - Spindle Refurbish

My MK3 is almost as described by Tony on lathes.co.uk/eagle
with one difference, at the back there are two deep grove ball bearings.


He writes:
Sized imperially, the ball races consisted of two opposed angular contact ball bearings behind the wheel with a single deep groove ball bearing at the drive pulley (rear) end. Interestingly, if the angular contact bearings are dismantled (they push apart) an owner reports that they can be revived by polishing the races lightly with diamond paste, fitting new balls and lubricating with ordinary lithium grease.

The spindle of my variant runs in two angular contact bearings, each pair in back to back (DB) arrangement. The preload adjustment is not clear, need to do more research here. The bearings are of imperial dimensions ID 25.4 OD 63.5 ( 1" x 2.5" ). 

The spindle assembly is pulled out to the front, there is a hole in the middle to restrain the shaft from rotating.

Once out, the bearings pull apart and the balls measure in at 10.30 mm since this is an imperial sized bearing my thinking is this was probably a 13/32" ball. (10,31875mm ). Initial measurements of the races ID and OD confirm this.

I could not find a suitable new replacement for the Bearings.
The replacement is still manufactured under the following names from R&M, SKF and some other brands.

RMS8    MJ1 - Deep Grove
AMS8    MJT1 - Angular Contact




Since the bearings show significant wear, there are two options under consideration.

1) Use 7006 bearings 30x55mm and machine new sleeves to fit the 1" shaft and 2.5" outer seat.

2) Do what  Tony describes. Order new balls, polish the races and see what I get.

Deckel FP2 Horizontal Spindle 1967

Three manuals three stories. I am writing this post to help me make sense of the the information I have at hand, and after reading up on practical machinist forums. There are various tidbits floating around but nothing concise. 

The German manual I have, resembling an old book depicts a spindle very similar in design and layout as seen in the English manual version from 1974. The 1974 manual describes a machine with single wheel speed and feed dials, and external motor. Where the other two manuals describe the two wheel machines with internal motors. However the older English Manual title page has the distinct 70's look seen on other NC Machines, and the font used looks modern compared to the German version. This makes me believe the German version describes the 60's models, the English version describes the early 70's models and the second English version describes later 70's models?

The main differences I can spot are what looks like a second set of needle roller bearings closer behind the first set on the older versions. The English 2 Wheel Manual with 70's font, actually describes these as "loosen 6 tighten 7 to adjust the front roller bearing" further the roller bearing clearance should be a maximum of  .0004"/.01mm. The clearance of the rear roller bearing, is determined by the dimensions of ring 9..." So in this version the needle bearings can be adjusted, implying them to run on tapered sections, which correlates with some information on practical machinist forums. The older German manual does not make reference to this, but the features exist on the drawing. What makes it more confusing is that 6,7 are referring to adjustment rings in the other two manuals, used for adjusting axial clearance on the spindle.

Now the question, what spindle does my FP2 have? The spindle, quill and head bear the engraving 137/137 A with -1.0, which was later 'erased'. This makes me think the parts where custom fit for each machine. With initial test results engraved on the parts, for easier fitting to final machines.

Are some spindles adjustable radially? or is this an error in the manual, introduced by translation/ draftsman in the middle?

Bearing grease to use original KLUBER ISOFLEX SUPER TEL or Franz Singer recommends LDS18

 

If you have more information on the spindle serial numbers, or spindle versions, please leave a comment.

Fig 1. German Manual ( 2Wheel Speed Feed/Internal motor)

Fig 2.  English Manual ( 2Wheel Speed Feed/Internal motor)

 Fig 3. English Manual ( 1 Wheel Speed Feed, External motor)

The entire machine is marked with what looks like a smiley with long eyes  =) anybody know what this symbol represents?

-1.0 Engraved on side of slot, not sure what this means since it was erased afterwards

137 on Spindle shaft, etch process

 A 137 and the erase -1.0 on the spindle quill