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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="timetraveller" data-source="post: 91689" data-attributes="member: 456"><p><strong>Another Update. </strong>This is to let you know where this project is. All the lower blocks are pressed on to the steering stems apart from the ones where the lower motion blocks were sent off for anodising. Those should be back early next week. All the lower links are fitted with bearings and fitted to the lower motion blocks apart from one which has defeated me, more of that later. All the springs have been delivered but I am still waiting for the 23 AVO dampers on order. I did chase them up at the start of this week to see if they could send part of the order down early but they prefer to deal with the whole batch together.</p><p>What has taken the time? Remember that the bearings are 32 mm O.D. and we need about one thou nip on that to ensure that the bearings are tight but not nipped up and distorted. One thou less than 32 mm is 31.975 mm which is 1.25885827 inches in old money. That is if there is wear due to the Oilite bushes having turned in the link, rather than on the eccentrics, then five thou wear means there is no interference fit. Well over half of the links worked on had this or more wear and so Loctite had to be resorted to. There was a four day delay while Loctite 638 was delivered. Even worse, several links were so badly worn that Loctite was not a solution and they had to be bored, sleeved and re-machined. There were even two which had previously been over bored and had reduced internal diameter bushes fitted to work on smaller than standard eccentrics. Beautifully done but a pain in the posterior. The one on which I have finally been defeated looked in perfect condition and machined up nicely. However when the bearings were fitted and a 20 mm diameter mandrel put through the bearings it was found that it was out of line by 3/16". It was heated, straightened and yesterday I fitted the third set of bearing, the first two sets having been destroyed. By this morning the whole thing had relaxed again and it was no longer lined up.</p><p>So that is where we are now. I should be able to start and send out parts next week to those who have not ordered AVO dampers or are having lower motion blocks anodise.</p><p></p><p>While this has been going on I have also been designing a set of parts to fit with a Chinese copy of a Hyper Pro Hydraulic steering damper. This is now done and parts are being laser cut for delivery next week. When these are finished they will have to go off for anodising, black in my opinion, There will be two parts, a 12 mm thick spacer to fit below the new steering heads and then a rather curvy item which fastens below the steering head and spacer and links to the damper movable link. It will be supported in the hole in the lower part of the steering stem which will have to be tapped by the end user and here I need some feedback. All the dimensions of the parts on the dampers are metric and it makes sense to me to tap the hole in the steering head M10. However, on my own bike (the ex-Cecil Mills road bike) which I am using for design work this hole was already tapped 3/8 BSF. It would be useful if any of you who have any potential interest in this damper mod could have a look inside this hole. I thought that they were all just plain holes but if they are all tapped 3/8 then that will have to be the thread use. Thank you.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 91689, member: 456"] [B]Another Update. [/B]This is to let you know where this project is. All the lower blocks are pressed on to the steering stems apart from the ones where the lower motion blocks were sent off for anodising. Those should be back early next week. All the lower links are fitted with bearings and fitted to the lower motion blocks apart from one which has defeated me, more of that later. All the springs have been delivered but I am still waiting for the 23 AVO dampers on order. I did chase them up at the start of this week to see if they could send part of the order down early but they prefer to deal with the whole batch together. What has taken the time? Remember that the bearings are 32 mm O.D. and we need about one thou nip on that to ensure that the bearings are tight but not nipped up and distorted. One thou less than 32 mm is 31.975 mm which is 1.25885827 inches in old money. That is if there is wear due to the Oilite bushes having turned in the link, rather than on the eccentrics, then five thou wear means there is no interference fit. Well over half of the links worked on had this or more wear and so Loctite had to be resorted to. There was a four day delay while Loctite 638 was delivered. Even worse, several links were so badly worn that Loctite was not a solution and they had to be bored, sleeved and re-machined. There were even two which had previously been over bored and had reduced internal diameter bushes fitted to work on smaller than standard eccentrics. Beautifully done but a pain in the posterior. The one on which I have finally been defeated looked in perfect condition and machined up nicely. However when the bearings were fitted and a 20 mm diameter mandrel put through the bearings it was found that it was out of line by 3/16". It was heated, straightened and yesterday I fitted the third set of bearing, the first two sets having been destroyed. By this morning the whole thing had relaxed again and it was no longer lined up. So that is where we are now. I should be able to start and send out parts next week to those who have not ordered AVO dampers or are having lower motion blocks anodise. While this has been going on I have also been designing a set of parts to fit with a Chinese copy of a Hyper Pro Hydraulic steering damper. This is now done and parts are being laser cut for delivery next week. When these are finished they will have to go off for anodising, black in my opinion, There will be two parts, a 12 mm thick spacer to fit below the new steering heads and then a rather curvy item which fastens below the steering head and spacer and links to the damper movable link. It will be supported in the hole in the lower part of the steering stem which will have to be tapped by the end user and here I need some feedback. All the dimensions of the parts on the dampers are metric and it makes sense to me to tap the hole in the steering head M10. However, on my own bike (the ex-Cecil Mills road bike) which I am using for design work this hole was already tapped 3/8 BSF. It would be useful if any of you who have any potential interest in this damper mod could have a look inside this hole. I thought that they were all just plain holes but if they are all tapped 3/8 then that will have to be the thread use. Thank you. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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