For those keeping score ...

[rjent]

Here is a picture.

shaft bearings for web.jpg (74.25 KiB) Viewed 15093 times

[rogersk]

Deleted post. Referred to the wrong shaft. My bad.

[JPG]

Here is a picture.

shaft bearings for web.jpg

I assume the shaft is 0.625"
Now are the bearings 35 mm od and 11mm thick?(MVII size)

[rjent]

What a magnificent machine! LOL

I got it back together (parts came in), balanced the belts, buttoned it back up and ....

Quiet, powerful, functional again.

I just hope she works for a while.....

[JPG]

What a magnificent machine! LOL

I got it back together (parts came in), balanced the belts, buttoned it back up and ....

Quiet, powerful, functional again.

I just hope she works for a while.....

Glad to see you maintained being "positive".

Now about the size, Ya gots a caliper to measure od and thickness?

[rjent]

What a magnificent machine! LOL

I got it back together (parts came in), balanced the belts, buttoned it back up and ....

Quiet, powerful, functional again.

I just hope she works for a while.....

Glad to see you maintained being "positive".

Now about the size, Ya gots a caliper to measure od and thickness?

Yeah, sorry JPG, I will do that tomorrow. I forgot all about you asking that.

If they are the same as the Mark VII the real argument is that this shaft can spin at 16000 RPM (mine does a lot of that) and there is tremendous pressure on the bearings because of the "balancing" by sound set up. I never have liked that process, not very precise IMHO.

It will be interesting to see what the bearing size is. I have another project tomorrow, but I will be sure to measure them...

[rjent]

What a magnificent machine! LOL

I got it back together (parts came in), balanced the belts, buttoned it back up and ....

Quiet, powerful, functional again.

I just hope she works for a while.....

Glad to see you maintained being "positive".

Now about the size, Ya gots a caliper to measure od and thickness?

Looks like they measure 30 mm x 7 mm

[JPG]

What a magnificent machine! LOL

I got it back together (parts came in), balanced the belts, buttoned it back up and ....

Quiet, powerful, functional again.

I just hope she works for a while.....

Glad to see you maintained being "positive".

Now about the size, Ya gots a caliper to measure od and thickness?

Looks like they measure 30 mm x 7 mm

Hmmmm. Smaller than 35 x 11 fer sure!!! Maybe that is why the MVII eccentric is so much larger than the M5/V.

[dusty]

The bearings on the tho 510/520 idler shafts that I have are 6803RS or 6803Z (30mm x 7mm). I also have an idler shaft for the Mark 7 and they measure the same. They most probably were all manufactured off shore but so what. There is not much these days that is not. I am even suspicious of items marked "USA".

I took a second look at these bearings and may have a correction. I now believe the bearings are 6903 and not 6803. The size between the two bearings (505/510 idle) is at least 1 mm larger in diameter. This means that the bearings must be pulled off toward opposing ends of the shaft. In the case of the Masrk 7 idler shaft the new pulley prevents the bearing from being pulled unless the pulley is removed first

Mark V and Mark 7 Idler Shafts with bearings

20200222_071055[1].jpg (840.32 KiB) Viewed 14772 times