Boxford Belt Slipping

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Boxford Belt Slipping

Home Forums General Questions Boxford Belt Slipping

  • This topic has 17 replies, 9 voices, and was last updated 7 May 2024 at 19:16 by Nicholas Farr.
Viewing 18 posts - 1 through 18 (of 18 total)
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  • #727744
    Hollowpoint
    Participant
      @hollowpoint

      Hi guys 

      I’ve just got my boxford aud back together after a house move. I had to strip it down into chunks and put it into storage. It’s been unused for about 2 years!

      Anyway, when reassembling I had to refit the belt which was an absolute nightmare. I noticed that the belt and pulleys were sodden with grease and oil so I expected some problems. Sure enough the belt is slipping. I can’t even take a 0.1mm cut!

      I’ve been looking around for a new belt, there seems to be a fair few options, starting at around £20 for a leather belt upto about £120 for a fenner “Nutlink” belt.

      I like the look of the nutlink option, but my questions are, are they any good? Anyone used them? Are they worth the £££?

      Thanks in advance.

       

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      #727745
      DC31k
      Participant
        @dc31k

        Your question does not make sense to me.

        Nutlink belts are available in A, B and Z section, all of which are vee-belts.

        https://www.georgelodgedirect.co.uk/Products/nutlink-belting

        To the best of my knowledge, there is no leather belt made in a vee section. Leather belts are usually a flat belt.

        Would it not make sense to clean everything and correctly tension the existing belt before deciding that a new belt is needed? If you go and drive your car on ice and the wheels spin, you do not run down to Kwikfit and put new tyres on it.

        All of the joinable belts are roughly the same price (circa £50 per metre). For the little use and low duty you will use the machine, alternative overseas (non brand name) suppliers might do just as well. If the machine has not been used for two tears, waiting three weeks for the delivery boat from China is insignificant.

        #727748
        Hollowpoint
        Participant
          @hollowpoint

          The boxford uses a leather “brammer” belt which I believe is an “A” section v belt. It looks like the original belt, probably about 50-60 years old! It has soaked up so much oil I doubt it will clean up.

          #727752
          Speedy Builder5
          Participant
            @speedybuilder5

            I have the same lathe, replaced the original belt with a cheaper option and regretted it !!

            They are expensive !  Try https://store.lathes.co.uk/belts/nu-t-link-v-belt

            A good reputation !

            #727776
            Nicholas Farr
            Participant
              @nicholasfarr14254

              Hi, I don’t know about the bench type ones, but I would think they have a linked belt also, so you don’t have to take the machine apart to change the belt, but with the under drive type, the belt to the spindle can only be tensioned by removing a link or two, from a linked belt, as there is no adjustment between the intermediate shaft and the spindle shaft, and dismantling the machine to fit an ordinary Vee belt would be a much more involved job to do, even if you could find one the right length.

              I can’t ever remember seeing a leather link belt, but that doesn’t mean they don’t exist, all the ones I’ve had anything to do with in my day jobs, were made from layers of impregnated and bonded together canvas with a rubber type material.

              Belt Link

              The link above is an old one that was on my Myford M type lathe, which is one size to big and has five canvas layers.

              Fenner belts have been in use in industry for years, and are among the well respected manufacturers. They may be pricey, but will most likely last very much longer then the cheaper versions, and I have heard how some of those cheaper types do stretch over a short period of time. There are other good reputable makes though, but their price may not be much different to the Fenner ones.

              Regards Nick.

              #727777
              Oldiron
              Participant
                @oldiron

                Overzealous greasing of the spindle will result in a slippery belt.  I have been using  RDG Link belt  

                on my Boxford  for several years without any problems at all.  It has had 100’s of hours of work and I have never had to remove a link to adjust it. I give the greasers a half turn every 4 hours running time or so. Do not screw them down every time you get to the lathe.

                #727792
                Bazyle
                Participant
                  @bazyle

                  Remember to get it the right way round when refitting.

                  #727825
                  mgnbuk
                  Participant
                    @mgnbuk

                    Check the state of the final drive pulley that connects through to the spindle on the underdrive – if the sides of the pulley have worn due to the belt having slipped due to under-tensioning, then a new belt won’t make any difference. Been there, done that !  The steel links running on the base diameter of a worn pulley don’t offer much in the way of grip. IIRC this pulley is machined integral with the 4 step pulley, so repair looked like it required the worn pulley to be machined off & a new one attached to the 4 step pulley.

                    My CUD came with a canvas link belt & I replaced it with a modern fibre reinforced plastic equivalent (Nu-T-Link IIRC) & even tensioned to bow-string tight it didn’t offer much in the way of drive – partly down to the worn pulley & partly due to the slippery nature of the plastic link belt over relatively small pulleys on a short(ish) centre distance – pictures from the belt manufacturers often show them on large equipment with big, multi-sheave pulleys & long centre distances.

                    Sadly not many alternative final drive options for an under drive Boxford, as the belt has to be split to go through the guard to get to the headstock. In America there are available split vee belts that have a series of holes drilled through the belt from back to front which are joined with a pair of steel link plates held together by screws that go through the holes – the inner plate is narrower than the outer to fit in the vee of the pulley. I have only come across one of these (fitted to an auxilliary drive on a machine that came in from the US) and ,while I can find suppliers in the US, I have not found any in the UK.

                    I “solved” my drive problem by selling the CUD & replacing it with a Myford, which isn’t much help to the OP.

                    Nigel B.

                    #727829
                    Hollowpoint
                    Participant
                      @hollowpoint

                      I’ll have to do some inspection but from a quick glance the pulleys look to be in ok condition. I might even try cleaning the belt and re-tensioning it.

                      #728094
                      Hollowpoint
                      Participant
                        @hollowpoint

                        This is the state of the linked belt. Not worth saving I don’t think. The good news is that the pulleys look ok. However upon inspection I found the motor belt is also in need of swapping. Anyone know what size it is? It just reads “Fenner 3280”.

                        PXL_20240428_144957049

                        #728100
                        Oldiron
                        Participant
                          @oldiron

                          My motor drive belt is “A” section. Take your belt off. Put adjustment  in the middle and wrap a piece of 6mm rope around the motor and lathe pulleys. Cut to exact length and measure. That will give you the belt length in inches or metric whatever you work with.

                          #728249
                          Nicholas Farr
                          Participant
                            @nicholasfarr14254

                            Hi Hollowpoint, I measured my Fenner 3280 vee belt today, around the outside, and it came to 28-3/4″, apparently you then deduct 2″ from this measurement for A section belts, to give you the belt length, which comes to 26-3/4″. In my Fenner book, imperial belt length designations are measured on the inside in inch’s, whereas metric belt designations are at pitch length in millimetres. When you calculate the diameter from the outside length above, and then deduct two belt depths and recalculate the length, it comes very close to the 26-3/4″,  The belt depth for an imperial A section belt being 5/16″. A27 is the closest one that is in Fenner’s list. Maybe the Fenner 3280 is just a part number for Boxford’s

                            Regards Nick.

                            #728282
                            Hollowpoint
                            Participant
                              @hollowpoint

                              Thanks for that. Very helpful. 🙂

                              I measured mine at 26.5″ inch ID and 28″ OD so very close to your measurements.

                              I’ve ordered a slightly smaller A26.5 belt, my thinking being that the old one might be a little stretched and worn.

                              I’ll try it and see, only £6.50 so if it’s wrong no biggie.

                              #728295
                              Nicholas Farr
                              Participant
                                @nicholasfarr14254

                                Hi Hollowpoint, there used to always some variation in in belt lengths, even by the same manufactuer, when I used to be in maintenance years ago, and had to change belts on multi vee pullies, we had to make sure that all the new belts were from the same batch, as if some were from a different batch, you would get some that would be looser or tighter than the rest, and there could be a very noticeable difference, and when you saw them running, the looser ones would really stand out. I’m sure there is a small amount of adjustment on the motor plate, so you may be able to get the next size down to fit.

                                Regards Nick.

                                #728961
                                Howard Lewis
                                Participant
                                  @howardlewis46836

                                  Normal V belts will vary slightly, especially between one manufacturer, or even batch.

                                  When we changed the triple belts for air compressors, we always checked that the belts were a good match before fitting.

                                  In this case, you may find that A section multilink belts will vary slightly between manufacturers.

                                  Hence do not mix links from different sources in the same belt assembly.

                                  They manufacture to a standard, but with a tolerance; so one might be to maximum, another to nominal and yet another to minimum. All within the the standard, butenough to make a difference.`

                                  One of things that we learned very early on was to be wary of tolerance build ups. A 0.005″ tolerance may not seem much, but twenty of them together become quite noticeable!

                                  Howard

                                  #729036
                                  Retired Barry
                                  Participant
                                    @wishiwasretiredbarry

                                    Hi…

                                    Personally I preferred this type of belt, https://fdoconnor.com.au/product/vee-flex-belting. Worked for years without problem, until I reground the bed on my Boxford and had plates welded and ground flat on the cabinet (instead of it levelled on boxford body filler!) which raised the bed and belt now too short, and it’s very expensive and difficult to get hold of unless you want lots of it.

                                    Went through a couple of rather nasty far east belts in a few weeks £50 or so down the pan! Got a Nut T link and after a couple of adjustments for bedding in, absolutely no problems. Has the advantage over the Vee flex of being able to put back links, if you cut too short! Don’t waste your money and patience on cheep stuff and get a decent belt.

                                    Regards Barry.

                                    #729541
                                    Hollowpoint
                                    Participant
                                      @hollowpoint

                                      <p style=”text-align: left;”>Finally got around to fitting the belts. I decided not to cheap out and went for the Fenner nutlink belt recommended and an optibelt A26.5 for the motor.</p>
                                      I am pleased to say everything fits perfectly and it seems to have solved my slippage problems. 👍 And as a bonus, it’s a bit quieter now as well.

                                      PXL_20240507_133757992

                                      #729574
                                      Nicholas Farr
                                      Participant
                                        @nicholasfarr14254

                                        Hi Hollowpoint, glad you got it sorted, and thanks for letting us know.

                                        Regards Nick.

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