Atlas 10100

[kopcicle]

I'll start with I do know the various differences in the MKII Blockheads.
I did however find a specific I do not know.
I'll include a drawing for the 701-088 spindle (feel free to upload it to the downloads section if it isn't there already)
I can't find out if the bearings are the only difference between the roller bearing and ball bearing spindles.
There is a part number difference. The ball bearing spindle is 701-083.
Are the spindles interchangeable? Is a minor dimensional change?
I really have no Idea and it's way to late in the day to call Clausing.

 

[markba633csi]

I think they are different- the left hand side end of the spindle comes in two different diameters and the sliding collar also I think
Let me measure my ball bearing one and I'll post it here
-Mark
OK the major dimension "A" is not .750 for the ball bearing spindle, it's .875. So definitely two different parts. And the two collars have two different part numbers but I don't remember them off hand
I believe the step pulley may be the same- not sure
The collar and key are the weak point in the design, they couple the pulley to the spindle. The .875 ball bearing version actually has more "meat" in this area and looks to be stronger than the roller bearing version- strange engineering decision

 

[kopcicle]

...so , turning the .875 down to .750 might , just might get it ?

 

[matthewsx]

Not sure what the goal is but I doubt changing to roller bearings would yield a significant improvement.

I put better spec ball bearings into mine but its weaknesses were still there, fine little machine for what it offers but it’s easy to put more into one than it will ever be worth.

John

 

[kopcicle]

the object is
Could I possibly convert the 701-083 into the 701-088 with just turning the .875 down to the .750 ?

 

[markba633csi]

I don't see why you would need to turn it down since I believe the step pulley diameters are the same for both- seems like if you didn't turn it down you would have the best of both worlds unless there is something I missed
I question whether the conversion would buy you any increase in performance however. Also not sure how the preload for the bearings is set on this version-?
-Mark

 

[kopcicle]

The question refers only to the availability of the spindle and has little or nothing to do with any performance advantage.

All I have on hand is the 701-088 , in the lathe and the drawing attached.
It's because I know of a 701-083 that I'm asking.
My existing spindle is serviceable but worn.
I'd like to replace the drive pulley bushing with bearing but this isn't an option on my worn spindle.
Clear enough now ?

Edit , just found the 701-083 drawing , let's see if it made it ...

 

[markba633csi]

Looks like the bearing dimensions are different. I suspected as much. The roller bearings id is 1.000 but the ball bearing is .985 unless I'm reading it wrong?
-M

 

[kopcicle]

well, my left (outside) bearing id is 1.000 and the right bearing is .990 per the 701-088 drawing.
The cup is 1.909"
I'll keep on this as I can but there seems to be a tale in the telling.

The one obvious difference in the two spindles is the 701-088 .750" left end diameter
compared to
The 701-083 diameter of .8750"

So now the question becomes can one be made to fit the other with a bearing and bushing change ?

Stay tuned as no matter what I find here and elsewhere it will be a tale in the telling .

Anyone else want to add to the confusion ?

 

[matthewsx]

I might have a spindle for you.