Crude live tooling

[The Artful Bodger]

If you really want to do it with a shaper....extend the tool bar so that it hits a ramp and lifts the tool at the end of the stroke.

[Bented]

I make many parts for this customer per year, many are larger diameter and have no grooves.

1 I have zero knowledge of what they do in use.

2 I make them as the drawing indicates even if it is wrong, trying to explain to an engineer that they are wrong works equally as well as telling a Catholic that God does not exist.


Last week I made 3 parts from a tabulated drawing, same part diameters at different lengths, the customer ordered the wrong length part, hilarity ensued.

[Doozer]

In my experience, for a shaft that's periodically loaded, good designers (or installers if it's not a split bearing) generally place the oil grooves so that they are providing oil at the point just before the load begins. From there it's pulled out of the grooves and into the loaded zone. These grooves should not have sharp edges either. They should either have a bevel that's about 15° from tangent or a convex radiused edge. This helps the oil get pulled out of the groove. If the load is non periodic, it's best to have at least one of the grooves on top so at a halt or very low speed gravity will pull oil down from there instead of holding it at the bottom and having it leak out. At higher speed the oil will cover the bearing as the shaft drags it around.

That is correct. Something Zora Arkus Duntov kept in mind when designing the small block Chevy crankshaft.

-Doozer

[nickel-city-fab]

I make many parts for this customer per year, many are larger diameter and have no grooves.

1 I have zero knowledge of what they do in use.

2 I make them as the drawing indicates even if it is wrong, trying to explain to an engineer that they are wrong works equally as well as telling a Catholic that God does not exist.


Last week I made 3 parts from a tabulated drawing, same part diameters at different lengths, the customer ordered the wrong length part, hilarity ensued.

.... and they still had to pay you.

[JoeCB]

If you really want to do it with a shaper....extend the tool bar so that it hits a ramp and lifts the tool at the end of the stroke.

See, another example of what can be learned from the guys here that know

Joe B

[JRouche]

Longitudinal grease grooves in 932 bronze bearing bores 7 1/ 2" long.




Asked my employer if they had done this job in the past, indeed they had and he finds a right angle die grinder hose clamped to a holder under a bench.

Chatter City and a slow process but they are only lubricant grooves so are not measured by the customer.
Crude but effective (-:

I think you nailed it!

What a deep cut. Well, it worked. . It looks nice, does it flow??

Kidding!! JR