PaulN Posted April 23, 2022 Share Posted April 23, 2022 My plastic/nylon bow roller needs replacing, as it's broken away on the cheeks after 14 years. However having searched on Google I can't find a suitable one. Does anyone know where I can find one please? The dimensions are Diameter 60mm but could go up to 70mm. Width 30mm and hole for a 10mm bolt. I have all chain on the mud weight running through a gypsy on an electric winch. I can find rollers with widths of 43mm and 49mm but not 30mm. any suggestions welcome please. Quote Link to comment Share on other sites More sharing options...
mikeyboy1966 Posted April 23, 2022 Share Posted April 23, 2022 Could someone local machine one up on a lathe or is it more complex than that? Quote Link to comment Share on other sites More sharing options...
Happy Posted April 23, 2022 Share Posted April 23, 2022 18 minutes ago, mikeyboy1966 said: Could someone local machine one up on a lathe or is it more complex than that? Where's Grendal?! 1 Quote Link to comment Share on other sites More sharing options...
Bikertov Posted April 23, 2022 Share Posted April 23, 2022 37 minutes ago, Happy said: Where's Grendal?! Just make sure you tell him it is for a real boat and not a model, otherwise you might get a perfect working bow roller - but in miniature 4 Quote Link to comment Share on other sites More sharing options...
grendel Posted April 24, 2022 Share Posted April 24, 2022 yes, it could be made on a lathe from a suitable material, you would need to know the radius of the internal groove, overall diameter and thickness, and hole diameter ( i think we have all of those bar the groove radius). though there should be a product available out there that would do the trick Quote Link to comment Share on other sites More sharing options...
AndyTBoater Posted April 24, 2022 Share Posted April 24, 2022 If you want to get all prim and proper (and this is for wire and rope) Groove diameter should be around 5% bigger than the rope Groove depth should be 1.5x rope diameter Groove angle of around 30 to 45 degrees All well in principle but these dimensions only allow for about a 12 degrees inclusive lateral deflection from vertical. You would probably get a lot more swinging on a mudweight. For your chain it would be completely different so the above is no help to anyone in this case. Just take the old one, copy that and refit. I would go with Delrin or Nylon 6.6 available here (and other places) https://www.directplastics.co.uk/nylon-6-6-rod Nylon 6.6 is hygroscopic but this is only a real problem with tight fitting applications. Easier to machine than standard Nylon 6 as well Quote Link to comment Share on other sites More sharing options...
grendel Posted April 24, 2022 Share Posted April 24, 2022 yes you can get special chain rollers that have 2 depths of groove, one for the links at right angles and the other for the links flat on to the roller (i believe they had some made up on the sailing channel sailing fair isle a month or so back. about a minute in on here - https://www.youtube.com/watch?v=2AdgCqZ2PFg Quote Link to comment Share on other sites More sharing options...
annv Posted April 24, 2022 Share Posted April 24, 2022 Hi I machined mine out of stainless steel there is a stockist with found bar who will cut it to length for you. just down from Life boat station in Golstone it will than last for ever. alternatively a new one from chandler but it wont have a grove for the chain links. John Quote Link to comment Share on other sites More sharing options...
Popeye Posted April 24, 2022 Share Posted April 24, 2022 (edited) This little company will do it for you. I have dealt with them and been in their workshop which is quite impressive. G Middleton Engineering Company Address Unit 8D, The Cromwell Centre, Roebuck Road, Hainault, Essex, IG6 3TU Telephone 020 8500 2551 Fax 020 8500 2554 Website www.midengineering.co.uk Edit: Just noticed your original one is plastic. However they could make you a metal one which would last you a lifetime. They are a good, friendly and easy to deal with company and will do the job at a reasonable price, they specialise in projects such as yours. And they are not too far from Canvey. Regards. Popeye. Edited April 24, 2022 by Popeye Additional info. 1 Quote Link to comment Share on other sites More sharing options...
PaulN Posted April 25, 2022 Author Share Posted April 25, 2022 Thank you all for your help, I'm just surprised I can't find a replacement for the existing roller (photo attached) Thanks Grendel for pointing out I need dimensions for the chain groove before I approach a manufacturer, I will be back to the boat in about 3 weeks. I was at Beccles about a week ago and saw Water Rail moored near Tim's office. I watched the Youtube video; the roller I need is slightly smaller Once I have these dimensions, I will follow up the other manufacturing suggestions members have kindly provided. Thanks again to you all. Paul 2 Quote Link to comment Share on other sites More sharing options...
annv Posted April 25, 2022 Share Posted April 25, 2022 Hi Paul I just left my roller the 2 inch dia of the bar and just cut a grove to allow the links of the chain to run in the grove the larger the dia the smother the chain will run, not had the chain jump out yet. John Quote Link to comment Share on other sites More sharing options...
PaulN Posted April 25, 2022 Author Share Posted April 25, 2022 9 minutes ago, annv said: Hi Paul I just left my roller the 2 inch dia of the bar and just cut a grove to allow the links of the chain to run in the grove the larger the dia the smother the chain will run, not had the chain jump out yet. John Hi John. The cheeks of my bow roller have broken so it needs replacing. It has to be 30mm wide to fit between the guides of the stainless steel fitting, so I will need to replace it, but can't find anything 30mm wide. Quote Link to comment Share on other sites More sharing options...
C.Ricko Posted April 25, 2022 Share Posted April 25, 2022 Hi Paul, I have a couple. Quote Link to comment Share on other sites More sharing options...
PaulN Posted April 26, 2022 Author Share Posted April 26, 2022 Thanks Clive, that's brilliant, I will come and see you when we are down at the Marina later in May. Paul from Swancraft has just contacted me and advised that the bow roller fitting was purpose made when he built the boat, which is why I can't find this size on the internet. 1 Quote Link to comment Share on other sites More sharing options...
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