Science of grease groving

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We are having issues of shaft wear out.  I know there has to be some thought to grooving right and I am wondering if our grooves are acting as cutters. I have yet to research myself as the issue was just presented to me.Sent from my SCH-I545 using TapatalkCRIME SCENES, COURT DATES, FUNERALS, RIDING THROUGH THE CITY WITH A BITCH THAT IS JUST BEAUTIFUL IT'S JUST BUSINESS AS USUAL.
Reply:Is this shaft riding in a bushing? What is shaft size? About what speed does the shaft turn? Has the grease type been changed recently? How long ago has it been since it has been operating with the grease used now? I am suspecting it is a lubrication issue. Either the grease used now is not up to the task or it is not being greased enough. If the grease type has been changed, a shaft could continue operating for weeks or months(possibly longer) before enough damage occurs to make it known that something is wrong. This is a problem that has most likely been building up over a period of time, and not something that has just happened. It's just that it finally got bad enough for y'all to notice it.This should probably be in the mechanics park questions, as this is not a general welding question.Last edited by Bistineau; 10-13-2014 at 01:13 PM.
Reply:We had some experience with having bushings that had turned in the saddle. When we took them apart to fix it, we found the grease grooves were clogged up. The grease had carbonized in the grooves and hardened. We got this cleaned out using screwdrivers and scratch awls. Then we ran a cylinder hone through the bore to open it up some so the grease could flow better. When we reinstalled the bushing, we drilled and tapped a hole between the bushing and yoke cap for a set bolt to hold the bushing in place. All of this was because the bushing had seized to the shaft, and the bushing was rotating in the saddle. These shafts don't rotate 360* though.
Reply:Shaft is about 1 3/4" no bushings. Pivot is moved by hand and it is only 1/4 turn. Lube maybe is playing a part but in my opinion the joint probably does not even need lubed. Or maybe I am just playing up my groove theory.They told me they had pictures of the fail which I wanted to see but when they came out it was just of the assembled unit so it did me no good.
Reply:Originally Posted by mikecwikShaft is about 1 3/4" no bushings. Pivot is moved by hand and it is only 1/4 turn. Lube maybe is playing a part but in my opinion the joint probably does not even need lubed. Or maybe I am just playing up my groove theory.They told me they had pictures of the fail which I wanted to see but when they came out it was just of the assembled unit so it did me no good.
Reply:In a former life I did a lot of grease and oil groves.  On shaft that turn I create >> groves with the arrow pointing in the rotation direction. This keeps oil / grease on the bearing surface where you want it. If you do a radial groove parallel with the outer edge the oil/ grease does not get distributed across the surface. I use this >  > and create 2 lubrication holes on the outer edges. This allows you to keep oil in. If you use the X patterns and have only 1 center point the oil / grease is forced out on the first revolution leaving the bearing empty.Just my 2 cents it is worth what you paid for it.Last edited by JeffKiper; 10-14-2014 at 12:18 AM.
Reply:mikecwik  -  Failure AnalysisYou are asking for a solution to a problem that you have not fully defined.Pics of the 'actual problem' would advance yourcause.Opus
Reply:I was not asking for a solution I was asking about grooving. Not much I can find out there.As I said I don't have the parts or pictures of anything useful. I don't think I will be getting any either.I coated the pin in layout dye and it the edge of the grease groove  cleaned up. Maybe that is just normal. I think I have come to the conclusion I put too much effort into what I do and don't seem to get anything back. F it. It's their problem not mine.Sent from my SCH-I545 using TapatalkCRIME SCENES, COURT DATES, FUNERALS, RIDING THROUGH THE CITY WITH A BITCH THAT IS JUST BEAUTIFUL IT'S JUST BUSINESS AS USUAL.
Reply:I used to do grease grooves in bronze bushing for the backhoes and other stuff had a boring bar with it shaped like an acme thread cutter profile...Wide groove flat bottomset the lathe to cut as few TPI as possible for long bushings...making sure the groove intersects with the grease fitting holeBacked my CATMA over your CARMA oops clusmy me  What would SATAN do ?? Miller Trailblazer 302 AirPakMiller Digital Elite  Optrel Welding HatArcair K4000Suitcase 12RC / 12 VSHypertherm PM-45Rage 3 sawRusty old Truck
Reply:The pin is about 7" long. Rotating part only adds up to 1.5". It seems that it would be better if it was the 5.5" remainder that pivots. Sent from my SCH-I545 using TapatalkCRIME SCENES, COURT DATES, FUNERALS, RIDING THROUGH THE CITY WITH A BITCH THAT IS JUST BEAUTIFUL IT'S JUST BUSINESS AS USUAL.