One way clutches.

[jotunn]

Re: One way clutches.

Sure diameter is important, but as you can see it has some tolerance.
But, there are other important parameters - surface hardness and surface roughness in table on page 4. Hardness not lower than 30-50HRC (depending on one way clutch type), and surface roughness max. 0.3-0.8Ra... and now important thing - what is the meaning of "max." - Ra for polished surface is 0.02-0.01, Ra for lathe finishing 80-2.5 (depending on grade of finishing), so where the scale begins?

I think that one way clutches problem comes from too low surface hardness of shafts - friction and forces in clutches are just polishing and destroying factory designed surface roughness. Also a micro particles coming from shaft surface mixes with clutch lubricant and blocks its precision construction.

If someone has an ultrasonic cleaner can try to remove all the grease and dirt from clutch, put a new grease and new shaft - it should last for almost the same time as new one.
You can also try flame hardening on factory shafts, so we could see if shaft make problem.

[habik]

[MFPTech]

Re: One way clutches.

and there's always that 1 guy who cant be bothered to remove the clutch or gears to clean or lube squeak and sprays the whole back of the machine with wd40 .......what should I do with him? :/

I suggest you supply him with one way clutches and one way bearings and torque limiters so he can replace them when they fail and forbid him using WD40 so he and your company look professional, reduce the callbacks and maximize your profit and customer's satisfaction. Oh, supply him with shafts too in case they are worn out and cleaning them lightly with scotchbrite doesn't help.

[methogod]

Re: One way clutches.

Common Sense Need Apply...

my POV is simple, if the one way is deep in an assembly that is hard to get apart without major disassemble. Then i do agree with cleaning in place. No WD40 but yes, i have had BH 920s that have the drive loop motor which has a few one way bearings and clutches which require many parts to be removed to replace parts. I cleaned the one ways on shaft by moved them back and forth - removing as few C clips as possible.

Now in regards to let's say the C6501 fuser drive. I pull them apart every few months, and clean and replace where needed. As the wear on that area is much greater when you have heat, grease and toner all mixing together.

I dont think i agree with the 1 million life they claim on that material. I would cut that in half, which is what konica does - most one ways and clutches are rated for 600K, some more if they are in duplex and only used in half the printing process....

just depends. Common sense will get you very far... Now IMO you get 1 shot to ruff up the shaft, after that you must replace.

[occus]

Re: One way clutches.

My opinion: never scratch the shaft (i don't change the oneway clutches...)
only clean it with a cloth (medical grade) with pure isopropanol... the shaft and the clutches!

[Copier Addict]

Re: One way clutches.

I lightly scuff the shafts with 150 grit emery cloth and clean the one way with a cloth. I do not lube after cleaning. I rarely need to replace one ways.

[Tech80]

Re: One way clutches.

I've used this Traction Oil for over 20 years. After cleaning the new oneway bearing, i use Graham Transmissions, Traction Oil, part#23-0015-00 Quart size, add a drop or 2 and it's ready to go. You don't want to use too much as I think it will defeat it's purpose.
I have in a bind, cleaned used bearings and a couple of drops of Traction oil and it usually works until I can order a new one. I've even had some success, when the bearing/gear is difficult to remove and you have to order another, to try to wash it/flush out with alcohol while installed and dripping a couple of drops so they go into the bearing still on the shaft. Many times will work until the replacement part comes in.

Graham used to have Traction Oil called Liquid Gold (and it worked super), but EPA shut that one down, then they came out with the Traction Oil.
Graham Transmissions, Milwaukee, Wisconsin, ph 414.355.8800.

[ivovb]

Re: One way clutches.

Lately I have issue with paper jams from bypass on BH C550. It was ... one way clutches. Fortunately they costs only 6 euro each. New was easier this time... Strange to say that KMs troubleshooting does not involve these parts. Or it is?

BR

[John Alldrick]

Re: One way clutches.

I'm with BlackCat about sanding shafts - : Supposed to be SMOOTH - no abrasives - no scratches

I use my oldest worn-out scotch-brite pad with all the Teflon coating gone (almost yellow in color) & Isopropyl & clean shafts around to shiny only

the 2 common sizes of 1-ways fit (for me) perfectly on either my #2 or #1 Philips shaft. I mount on my driver shaft vertically, apply a few drops of alcohol & spin 'til clean and free-wheeling

I used to use Tri-flo until on a Prod color course, a senior tech from California mentioned the Teflon particles would occasionally cause an issue

now I use 2 drops red standard transmission fluid (ATF) - doesn't bother the nylon in 1-ways, and designed to release particles, not carry them. I apply while on the Driver shaft & spin to get rid of excess - needs just a very thin layer. I don't use cotton swabs anymore for fear of a fibre getting caught & left behind - but I'm old & feeble

I have sub-production (C650 ish) machines with 10 million clicks (counting 11x17 as one) and NEVER replaced feed shafts ... ever.

Some of my co-workers seem to replace 1-ways almost with every feed roll. (I think they're lazy ...)

If I test it after cleaning and it slips, I replace it, but I'd estimate I've replaced less than 50 in 30+ years