.814 spindle bushing reamer

[bbrocksr]

Depends on who is running the Hone or Reamer, You can get an excellent job with either one or you can get a poor job with either one.
A precision spiral flute Kingpin reamer will do an excellent job if used correctly.
Reaming gets a bad rap from inexperienced people using an adjustable or
straight blade reamer are ending up with a job like in the Sunnen picture.

The kingpin reamer is started from one end and is ran all the way through both bushings and as a result both bushings are reamed in alignment.

Bill
.0015 is good, no clearance = no grease is bad.

 

[Jerry Parr WI]

Long time question of mine. King pins are lubricated with grease on an occasional basis and are subject only to a small amount of movement. Wouldn't the small chatter marks from reaming tend to become reservoirs holding grease for the surfaces?

Would not the extra smooth surfaces from honing increase the tendency to squeeze out the grease resulting in poor lubrication. Parts that are normally honed are close tolerance and bathed in a constant stream of oil for lubrication unlike a king pin.

 

[TagMan]

Long time question of mine. King pins are lubricated with grease on an occasional basis and are subject only to a small amount of movement. Wouldn't the small chatter marks from reaming tend to become reservoirs holding grease for the surfaces?

Would not the extra smooth surfaces from honing increase the tendency to squeeze out the grease resulting in poor lubrication. Parts that are normally honed are close tolerance and bathed in a constant stream of oil for lubrication unlike a king pin.

DING, DING - We have a winner!! Exactly my thoughts on the subject, speaking as a retired machine tool builder. We always scraped slow moving, sliding surfaces as the scraping resulted in small pockets that retained oil and lubricated both parts better than a ground surface would do.

 

[rotorwrench]

Most king pin bushings, at least the good ones anyway, have a "V" groove in them that extends from top to bottom and all the way around the ID. If they don't have the groove then grease will have a hard time flowing but it will flow. Just not very evenly for sure.

 

[Chisel]

A couple quick passes through the two new bushings and you have a perfectly sized hole and alignment. I had a pair of spindles that needed sized a couple days ago, so took a couple pictures.