Silver steel with roller bearings.

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Silver steel with roller bearings.

Home Forums General Questions Silver steel with roller bearings.

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  • #149940
    Chris123
    Participant
      @chris123

      I've been asked to make some bearing bushes for inside a roller bearing race.

      Is silver steel suitable?

      I have no experience of this!

      Thanks,

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      #23253
      Chris123
      Participant
        @chris123
        #149945
        Ian P
        Participant
          @ianp

          Too many unknowns to give a sensible answer.

          It might be OK. My only experience is mild steel running inside a needle roller race on a car steering column. Very slow speed and very little side load. Its worked OK for 40 years but I would not consider it would be suitable for a motor.

          Ian P

          #149958
          colin hawes
          Participant
            @colinhawes85982

            A few years ago I made silver steel rollers for hard- to- find ~80cc motorbike crowded roller bigend for a young friend and the bearing was still going strong after a year of hard work. The rollers were hardened, quenching in water, and tempered to a pale straw colour. I have made several successful less stressed bearing rollers in the same way since then for various vintage machinery repairs. Colin

            #149959
            Ady1
            Participant
              @ady1

              From me2576

              Home made roller bearing from 40cc petrol engine

              crankpin
              Made from silver-steel, this was screwed into
              the web with a fine thread. Before finally
              pegging into position it was hardened and
              tempered to a deep straw colour and lapped to
              size. Two thous. were allowed for this operation
              and no appreciable distortion occurred through
              the hardening process.

              Rollers
              A few preliminary trials showed that unless
              the rollers were constrained, serious distortion
              would occur through hardening. Thirty-seven
              1/2 in full lengths of 1/16 in. diameter silver-steel
              were cut off and pressed into a mild-steel tube of
              the same length and lapped in the bore to a
              diameter of 7/16 in., or more exactly, 0.4375 in.
              This number was selected because it is the
              nearest number of 1/16 in. diameter circles to the
              required number which lie geometrically in
              contact. (It provided a goodly munber of
              spares.) With one at the centre, successive
              layers were 6, 12, and I8. They were secured
              against movement by a spot of soft solder for
              facing to length on the emery wheel. The
              solder was cleaned off, the rollers replaced into
              the tube, and the whole brought to a dull red
              heat and quenched in oil. No discernible
              distortion occurred in any of the rollers. They
              were polished by rolling a few at a time between
              two pieces of flat brass sheet smeared with a
              touch of fine lapping paste.

              Outer Sleeve
              Cast steel was used for this and the inside
              and outside diameters were machined with
              0.002 in. allowance on each for final lapping.
              A mild-steel plug having a nice push it was
              inserted in the bore as a safeguard against
              distortion during hardening. The heat treatment
              consisted of quenching in oil from a cherry-rred
              heat and tempering to a dark straw, evenly heating
              in hot sand.- The sleeve was then lapped to
              size, internally and externally, the first dimension
              being checked by a plug gauge lapped to size
              also (0.545 in. diameter)

              Conclusion
              On assembling the parts, the results were
              extremely gratifying. The 24 rollers fitted
              around the crankpin to a nicety ; there was no
              lateral shake in the assembled bearing and it
              worked with a pleasing ease and smoothness,
              each roller turning evenly.

              Edited By Ady1 on 16/04/2014 10:24:28

              #149961
              KWIL
              Participant
                @kwil

                Dependant upon the size of the needle roller bearings you can buy hardened insert bushes to fit,

                #149965
                Oompa Lumpa
                Participant
                  @oompalumpa34302

                  I don't think the OP was actually asking how to make rollers, more the inner bush for roller beasrings, you know, like a polo but not minty

                  If it is a big diameter bush you may find the cost of the material a bit salty. Might want to think of alternative materials or going the case hardening route.

                  graham.

                  #149972
                  Ian S C
                  Participant
                    @iansc

                    For light use, even a mild steel pin works ok for the crank on my Ross Yoke Stirling Engine. The bearing suppliers have a (?stainless) sleeve that is Loctited on the shaft. The silver steel should give quite good service. I think I'm off course with this, I think you have a roller bearing (not needle roller), with inner and outer races, and you wish to fit it to a reduced size of shaft, mild steel would be ok, or even 4140 unheat treated, depending on the use, an aluminium bush might be ok. Ian S C

                    Edited By Ian S C on 16/04/2014 13:33:03

                    #150001
                    Chris123
                    Participant
                      @chris123
                      Posted by Oompa Lumpa on 16/04/2014 11:03:56:

                      I don't think the OP was actually asking how to make rollers, more the inner bush for roller beasrings, you know, like a polo but not minty

                      If it is a big diameter bush you may find the cost of the material a bit salty. Might want to think of alternative materials or going the case hardening route.

                      graham.

                      Yes, this is right!

                      its for the a rear suspension on a mountain bike linkage. so needs to be hard enough to resist compression (indentation) from forces on the rear wheel.

                      The chap has the roller bearing race already, so a bush is needed for inside the race with a hole for the linkage bolt to go through. So polo shape as you say!

                      #150355
                      Chris123
                      Participant
                        @chris123

                        Any ideas?!

                        #150366
                        jason udall
                        Participant
                          @jasonudall57142

                          Just in case I have missed something..The roller race does or doesn’t have an inner?
                          Because if it does then all you are doing is bushing it to suit the linkage bolt?…in which case almost any steel would suffice..
                          But if the rollers will act on your “bush” directly then that’s a horse of a different colour..
                          If just a bush and not in effect the inner of a race then make a fit on inner of race ( even use bearing /bush lock glue )..

                          #150370
                          Neil Wyatt
                          Moderator
                            @neilwyatt

                            Both PGMS and unhardened silver steel have been used in the past for loco axleboxes.

                            Surface finish is, perhaps, more important than hardness in such a role. On mountain bike there will be serious shock loads, so Imaybe one of the manufacturer's sleeves for avoidance of doubt..

                            Neil

                            #150793
                            Phnug
                            Participant
                              @phnug

                              Bicycle … So I'm thinking small bush that needs to be light and corrosion resistant. Silver Steel would work for sure but would be an unnecessarily expensive option. I concur with Jason and Ian SC above in that most common steels could be used.

                              I cycle (not too often … only when I can't find the lathe chuck key) and if it were me I would try a brass, bronze or aluminium (light weight) bush first and see whether it stands up to the conditions. Alternatively, a bush made of some Acetyl or Delrin would be fitted.

                              Alternatively, steel, or you could get real fancy and use a stainless steel such as 304. It has enough strength, it looks nice and does not corrode easily, but is heavier.

                              It depends what I had lying on the rack …

                              Ian

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