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Whilst at Abbotsholme on Sunday I was asked about the availability of two speeder chainguards, and was informed later that club-owned tooling has been used to make these in the past. At present I am using wooden forming patterns made by a member some years ago which are satisfactory, but I understand that another device(s) exists which forms the double curvature end in one operation. Anything that eases the manufacture of these parts is of interest to me and I would like to know the wherabouts of this tooling, and if possible to borrow it or them in order to make a few chainguards by this method.
From the description given to me the tool consists of a “big heavy lump of metal with a pivoted handle” upon which the material is placed before the handle is pulled round to form the end of the chainguard with the double curvature. This sounds much faster and thererfore cheaper than the present method I’m using, so if this description rings a bell with you, or you could add any further information then please get in touch.
The wooden formers that I gave to John a while back came originally from Ron Mainprize, of Hull, via John Thompson, and I understand that they were really intended to be patterns to get cast metal items made, rather than being used directly. If metal formers were made from them I think that a lever-operated grooved roller could be attached quite easily, that would form the double-curvature of the rear end of the chainguard onto the sheet metal ‘blank’, in a similar fashion to a plumber’s pipe-bending machine. I think that components from such a machine could be used to construct the tooling, especially the grooved rollers and linkages.
Does anybody know how I could get in touch with Jack Butterworth ? I believe that he has in the past made various sheet metal items and may know of the tooling for 2 and 3 speeder chainguards. Please send a p.m. if you are able to help with this.
Also on the subject of chainguards, does anybody have the ability to turn a quantity of threaded mounting bosses? (I will E-Mail the drawing) I do not have any turning facilities although would be able to drill the rivet holes, as I would like to be able to supply an assembled complete item. The bosses are used in pairs on chainguards and I think a dozen would be a good start.
Hi John, When I was running the Spares Scheme I had chainguard mounting bosses in stock, but only a handful. It was basically a disc with one chamfered edge, about 1.25″ diameter and about 1/8″ thick, and a 1/4″ countersunk hole in the middle for a screw to sit in that held the chainguard to its mounting lugs. Then on the remaining part of the disc were four smaller holes, also countersunk, that were intended to feed solder into when fastening the boss to the guard. Once the boss is in the correct position the same holes can then be used to install rivets for final fixing. I have one or two old used ones, and could let you have one as a sample if needed.
Hi John please e-mail me a drawing at email@example.com Alan Noakes.
Hi Brian,Thanks for your offer of a chainguard boss, your description matches the ones fitted to my 38 Flyer. I have produced a drawing from this and have arranged for a quantity to be made.
By the way I have been given contact details for Jack Butterworth and shall make contact soon and hopefully be able to throw a little more light on the chainguard tooling.