Using Bearings Instead of Brass Bushings

Yes

I know you answered the Question Directly.

Would you give me the bearing type or class.

It seems that a few has lost their bearing.

for a more serious response, I'm not sure you can replace it.

First, look at the loading, you have a 4" wide brass bushing providing even loading of the roller. I haven't seen a 4" wide (3/4" ID) bearing.

What is the ID of the roller? (OD of the bearing)

then there is cost, you're not too likely to find a set of bearing cheaper then you can replace the brass bushing...

Are you thinking about putting a bushing at each end of the roller?

Well I was considering a bearing at each end.

When I had the roller created as a full bushing a few years ago It was likely the wrong way to go. It has not made a big problem yet.Although it must be cleaned and oiled more often than planned.

I have made some modifications to my press that change the pressures a little.

I am working on an answer to a problem that has not fully surfaced yet.

I think boring out the core and placing new bushings in ends may be the answer.

I was looking at a bearing without the inside ring. Even changing the shaft to fit is an option

Thank you Labyguy.

Sounds to me like the rubber roller is bonded to the bushing and therefore must be replaced as a complete assembly. Check with the manufacturer of the press.

Sounds to me as if you may want to use needle bearings.

You could also try simply replacing your bushings with oil-lite bronze.

Sounds to me like a standard darkroom roller (for making glossy prints). Buy 'em by the case.

Yes you can replace brass bush with ball bearing. In your case you should use sealed bearing in sealed type bearing moly base greased is filled hence provide lubrication & sealing does not allow it to come out at wrking temp up to 60-70 Degree centigrade.

You have refer the hand book of SKF/ NRB or any standard manufacturer catalog.

Kronezz.......For years people have used brass as a wearing material.....what is your wearing issue and what grade of brass are you using?

Anthony@alnoproductservices.com.au

http://www.alnoproductservices.com.au

Replace bronze with graphite impregnated nylon no lube required

it sounds to me like the reason why the brass goes all the way through the rubber is because it ensures even loading of the rubber across the whole length.

replacing this full length bushing with two bearings on the sides wound point load the ends of the rubber roller giving u uneven distribution of load due to the very elastic properties of the rubber.

fortunately you can achieve even loading by placing many bearings throughout the length of the rubber on the inside, say one every inch. the bearings should all be mounted inside a steel or aluminum tube so that the bearings can apply even force to the outer tube and therefore the tube can apply even load to the rubber. to keep these bearings evenly spaced some polycarbonate, or aluminum spacers can sit in between these bearings and some simple c clips can hold the whole assembly centered in the roller. i would use roller bearings because they are meant to withstand more load and can be purchased not needing maintenance. i think you need some cylindrical or needle bearings. needle bearings are especially good at mastering high loads for how small they are.

my source for bearings: http://www.mcmaster.com/#ball-and-roller-bearings/=33epf6

Not Brass bearings but Phosphorous Bronze bearings were very extensively used in past they have longer life than Brass bearings.

Suresh Sharma.

You do not want to use ball bearings or needle bearings even with seals they will eventually clog with ink and are not suitable for sideways movement.

Your roller needs full length support as mentioned before and sleeve type bearing is your best option.

Fit a brass or stainless sleeve into the bore then fit teflon or nylon bush in this as mentioned earlier.

It is easy to clean also this is easily replaced when wear is unacceptable.

Nylon would likely cause wear the shaft...unless captured well Teflon will rupture... Rulon mentioned earlier is a better choice

You can get graphite loaded nylon also the teflon or nylon will be encased in the metal tube which can have metal retaining caps on the end.

The main idea being that this bearing method is easily replaced without disturbing the metal tube in the rubber roller.

Its just a general idea I don't plan to do a whole design on this I am sure the poster can work out any refinements.

Precisely

Vesconite!

You need the support along the length so bearing at either end will not be ideal. This is a good material for this purpose.