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Finishing a bearing seats and abutments

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PekkaNF:
This is time for a bit more serious small spidle build. Tired of glued ball bearings.

I have an idea, but there are two avenues:
* traditional bored/ground trough hole with bushings
* Bored trough, two different diameters.....

I build today a gauge for 32,00 bearing nominal dimenssion, this is for fixed end and bearings will be abuted against solid outer wall. Gauge min/max diameter portions worked out pretty good. M33x1 thread did seem to come out ok, but banjo kicked out middle of it. I tried to reset gear back and got major/minor diameter right, but when I checked the thread it had too wide groove. Have to make another. And maybe couple of nuts on same go.

Not too happy with my laps yet. Started to make some cast iron laps. However, the abrassive part is harder part. So far I have used loose lapping abrassive.

Now I am trying to charge the lap with abrassive, but which abrassive to use and how to charge?

Progress so far.

Pekka

PekkaNF:
Finding a whole lot of traditional loose abrassive lapping, like this:
  Lapping (and honing) - some techniques for discussion
http://www.modelenginemaker.com/index.php/topic,1908.0.html

And some industrial machines, but no much hard laps I'm looking for.

http://www.grstools.com/PDF/LIT-322_CastIron.pdf

Some anekdotal information suggest that it is not very optimal as a method:
http://www.aspe.net/publications/Annual_2001/PDF/POSTERS/PROCESS/POLISH/1291.PDF

Might revert back to bad bad habits.

Pekka

 

PekkaNF:
I got pretty good hit to have a look on morse taper collet.

+ near 1:20 taper
+ economical
+ available reamers and collets

- All dimessions all over the places for metric world and even taper is 1:20:ish....

MT2 12 mm collet seems to be close, MT3 16 mm collet would have left only 2-3 mm meat.

Anyway got 28 mm and 32 mm OD dimenssions -0,01....-0,03 mm under nominal OD. Hope they retain the shape after splitting trough.

I'm thinkking to use band saw blade to cut a single slit slightly diagonal. What do you guys think? Doesn't diagonal sound better than straight?

Pekka

PekkaNF:
Some progress.

Funny how fast stuff comes together with standard parts.

I need to use key or something to tie up together lap and handle. Any suggestions? Slot trough three parts and key?

Pekka

charadam:
Pekka,
In the final product, what order of precision are you aiming at?

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